Dag Roar Hjelme

About

Teaching

TFE4166 Photonics II (Spring)

TFE4202 Sensor Systems - design 1 (Fall)

TFE4204 Sensor Systems - design 2 (Spring)

IELET2112 Applied instrumentation (Fall)

IELET3109 Advanced Sensorsystems (Spring)

Publications

2024

Jerve, Fredrik Wilsbeck; Hjelme, Dag Roar; Kalvøy, Håvard; Allen, John; Tronstad, Christian. (2024) Exploration of the Conditions for Occurrence of Photoplethysmographic Signal Inversion above the Dorsalis Pedis Artery. Sensors
Academic article

2023

Grayson, Michael; Krueper, Greg; Xu, Bo; Zohrabi, Mo; Hjelme, Dag Roar; Gopinath, Juliet. (2023) On-chip mid-infrared optical sensing with GeSbSe waveguides and resonators. Optics Express
Academic article
Urban, David; Marcucci, Niccolò; Wölfle, Christoph Hubertus; Torgersen, Jan; Hjelme, Dag Roar; Descrovi, Emiliano. (2023) Polarization-driven reversible actuation in a photo-responsive polymer composite. Nature Communications
Academic article

2022

Urban, David; Hjelme, Dag Roar; Descrovi, Emiliano. (2022) Polarized light guiding anisotropic deformation and relaxation in photosensitive polymeric substrates . The European Physical Journal Conferences
Abstract
Schwermer, Silje Fuglerud; Hjelme, Dag Roar; Aksnes, Astrid; Milenko, Karolina Barbara. (2022) Near Infrared Spectroscopy for Continuous Glucose Monitoring. Doctoral theses at NTNU (184)
Doctoral dissertation
Schwermer, Silje Fuglerud; Noh, Jong Wook; Aksnes, Astrid; Hjelme, Dag Roar. (2022) Performance improvement in a supercontinuum fiber-coupled system for near infrared absorption spectroscopy. Applied Optics
Academic article
Muri, Harald Ian; Hjelme, Dag Roar. (2022) Sensor Technology Options for Municipal Solid Waste Characterization for Optimal Operation of Waste-to-Energy Plants. Energies
Academic article

2021

Osinski, Dominik; Łukowska, Marta; Hjelme, Dag Roar; Michał, Wierzchoń. (2021) Colorophone 2.0: A Wearable Color Sonification Device Generating Live Stereo-Soundscapes—Design, Implementation, and Usability Audit . Sensors
Academic article
Fuglerud, Silje Skeide; Ellingsen, Reinold; Aksnes, Astrid; Hjelme, Dag Roar. (2021) Investigation of the effect of clinically relevant interferents on glucose monitoring using near‐infrared spectroscopy. Journal of Biophotonics
Academic article
Milenko, Karolina Barbara; Yerolatsitis, Stephanos; Aksnes, Astrid; Hjelme, Dag Roar; Stone, James M.. (2021) Micro-lensed negative-curvature fibre probe for raman spectroscopy. Sensors
Academic article
Yadav, Mukesh; Noh, Jong Wook; Hjelme, Dag Roar; Aksnes, Astrid. (2021) Spectral shaping of ring resonator transmission response. Optics Express
Academic article
Muri, Harald Ian; Hjelme, Dag Roar. (2021) Classification of municipal solid waste using deep convolutional neural network model applied to multispectral images. Proceedings of SPIE, the International Society for Optical Engineering
Academic article

2020

Muri, Harald Ian; Wahl, Markus Solberg; Lamb, Jacob Joseph; Snilsberg, Rolf Kristian; Hjelme, Dag Roar. (2020) Sensor fusion. Springer
Academic chapter/article/Conference paper
Wahl, Markus Solberg; Muri, Harald Ian; Snilsberg, Rolf Kristian; Lamb, Jacob Joseph; Hjelme, Dag Roar. (2020) Temperature and humidity measurements. Springer
Academic chapter/article/Conference paper
Lamb, Jacob Joseph; Burheim, Odne Stokke; Hjelme, Dag Roar. (2020) Introduction. Springer
Academic chapter/article/Conference paper
Muri, Harald Ian; Lamb, Jacob Joseph; Wahl, Markus Solberg; Snilsberg, Rolf Kristian; Hjelme, Dag Roar. (2020) Hydrogen gas measurements. Springer
Academic chapter/article/Conference paper
Wahl, Markus Solberg; Lamb, Jacob Joseph; Muri, Harald Ian; Snilsberg, Rolf Kristian; Hjelme, Dag Roar. (2020) Light properties and sensors. Springer
Academic chapter/article/Conference paper
Wahl, Markus Solberg; Wilhelmsen, Øivind; Hjelme, Dag Roar. (2020) Using Fiber-Optic Sensors to Give Insight into Liquid-Solid Phase Transitions in Pure Fluids and Mixtures. Experimental Thermal and Fluid Science
Academic article
Fuglerud, Silje Skeide; Milenko, Karolina Barbara; Aksnes, Astrid; Hjelme, Dag Roar. (2020) Surface-Enhanced Absorption Spectroscopy for Optical Fiber Sensing. Materials
Academic article
Jernelv, Ine Larsen; Strøm, Karina; Hjelme, Dag Roar; Aksnes, Astrid. (2020) Mid-infrared spectroscopy with a fiber-coupled tuneable quantum cascade laser for glucose sensing. Proceedings of SPIE, the International Society for Optical Engineering
Academic article
Wahl, Markus Solberg; Aasen, Ailo; Hjelme, Dag Roar; Wilhelmsen, Øivind. (2020) Ice formation and growth in supercooled water–alcohol mixtures: Theory and experiments with dual fiber sensors. Fluid Phase Equilibria
Academic article
Jernelv, Ine Larsen; Høvik, Jens; Hjelme, Dag Roar; Aksnes, Astrid. (2020) Signal enhancement in microstructured silicon attenuated total reflection elements with quantum cascade laser-based spectroscopy. Proceedings of SPIE, the International Society for Optical Engineering
Academic article
Jernelv, Ine Larsen; Hjelme, Dag Roar; Aksnes, Astrid. (2020) Infrared measurements of glucose in peritoneal fluid with a tuneable quantum cascade laser. Biomedical Optics Express
Academic article
Jernelv, Ine Larsen; Hjelme, Dag Roar; Matsuura, Yuji; Aksnes, Astrid. (2020) Convolutional neural networks for classification and regression analysis of one-dimensional spectral data. arXiv.org
Academic article
Jernelv, Ine Larsen; Hjelme, Dag Roar; Aksnes, Astrid. (2020) Mid-Infrared Tuneable Laser Spectroscopy for Glucose Sensing. Doktoravhandlinger ved NTNU (ISSN 1503-8181)
Doctoral dissertation
Milenko, Karolina Barbara; Fuglerud, Silje Skeide; Aksnes, Astrid; Ellingsen, Reinold; Hjelme, Dag Roar. (2020) Optimization of SERS Sensing With Micro-Lensed Optical Fibers and Au Nano-Film. Journal of Lightwave Technology
Academic article

2019

Fuglerud, Silje Skeide; Milenko, Karolina Barbara; Ellingsen, Reinold; Aksnes, Astrid; Hjelme, Dag Roar. (2019) Glucose sensing by absorption spectroscopy using lensed optical fibers. Applied Optics
Academic article
Sarker, Shiplu; Lamb, Jacob Joseph; Hjelme, Dag Roar; Lien, Kristian Myklebust. (2019) A review of the role of critical parameters in the design and operation of biogas production plants. Applied Sciences
Academic literature review
Lamb, Jacob Joseph; Bernard, Olivier; Sarker, Shiplu; Lien, Kristian Myklebust; Hjelme, Dag Roar. (2019) Perspectives of optical colourimetric sensors for anaerobic digestion. Renewable and Sustainable Energy Reviews
Academic literature review
Lamb, Jacob Joseph; Lien, Kristian Myklebust; Hjelme, Dag Roar. (2019) Digitalization of colourimetric sensor arrays for volatile fatty acid detection in anaerobic digestion. MethodsX
Academic article
Lamb, Jacob Joseph; Islam, Md Hujjatul; Hjelme, Dag Roar; Pollet, Bruno; Lien, Kristian Myklebust. (2019) Effect of power ultrasound and Fenton reagents on the biomethane potential from steam-exploded birchwood. Ultrasonics sonochemistry
Academic article
Lamb, Jacob Joseph; Bernard, Olivier; Sarker, Shiplu; Lien, Kristian Myklebust; Hjelme, Dag Roar. (2019) Perspectives of surface plasmon resonance sensors for optimized biogas methanation. Engineering in Life Sciences
Academic literature review
Wahl, Markus Solberg; Wilhelmsen, Øivind; Hjelme, Dag Roar. (2019) Addressing Challenges in Fabricating Reflection-Based Fiber Optic Interferometers. Sensors
Academic article
Lamb, Jacob Joseph; Hjelme, Dag Roar; Lien, Kristian Myklebust. (2019) Carbohydrate Yield and Biomethane Potential from Enzymatically Hydrolysed Saccharina latissima and Its Industrial Potential. Advances in microbiology
Academic article
Fuglerud, Silje Skeide; Milenko, Karolina Barbara; Ellingsen, Reinold; Aksnes, Astrid; Hjelme, Dag Roar. (2019) Feasibility of supercontinuum sources for use in glucose sensing by absorption spectroscopy. Proceedings of SPIE, the International Society for Optical Engineering
Academic article
Åm, Marte Kierulf; Fougner, Anders Lyngvi; Ellingsen, Reinold; Hjelme, Dag Roar; Bösch, Patrick Christian; Stavdahl, Øyvind. (2019) Why intraperitoneal glucose sensing is sometimes surprisingly rapid and sometimes slow: A hypothesis . Medical Hypotheses
Academic article
Åm, Marte Kierulf; Fougner, Anders Lyngvi; Ellingsen, Reinold; Hjelme, Dag Roar; Bösch, Patrick Christian; Stavdahl, Øyvind. (2019) Erratum to “Why intraperitoneal glucose sensing is sometimes surprisingly rapid and sometimes slow: A hypothesis” [Med. Hypotheses 132 (2019) 109318]. Medical Hypotheses
Errata
Jernelv, Ine Larsen; Strøm, Karina; Hjelme, Dag Roar; Aksnes, Astrid. (2019) Infrared Spectroscopy with a Fiber-Coupled Quantum Cascade Laser for Attenuated Total Reflection Measurements Towards Biomedical Applications. Sensors
Academic article

2018

Sarker, Shiplu; Lamb, Jacob Joseph; Hjelme, Dag Roar; Lien, Kristian Myklebust. (2018) Overview of recent progress towards in-situ biogas upgradation techniques. Fuel
Academic literature review
Milenko, Karolina Barbara; Fuglerud, Silje Skeide; Kjeldby, Snorre Braathen; Ellingsen, Reinold; Aksnes, Astrid; Hjelme, Dag Roar. (2018) Micro-lensed optical fibers for a surface-enhanced Raman scattering sensing probe. Optics Letters
Academic article
Muri, Harald Ian; Hoang, Linh; Hjelme, Dag Roar. (2018) Mapping nanoparticles in hydrogels: A comparison of preparation methods for electron microscopy. Applied Sciences
Academic article
saldana, diego sanchez; Hjelme, Dag Roar. (2018) online sensor concept for municipal solid waste characterization review. NTNU and ENERSENSE
Report
Muri, Harald Ian; Bano, Andon; Hjelme, Dag Roar. (2018) LSPR and Interferometric Sensor Modalities Combined Using a Double-Clad Optical Fiber. Sensors
Academic article
Muri, Harald Ian; Bano, Andon; Hjelme, Dag Roar. (2018) A single-point, multiparameter, fiber optic sensor based on a combination of interferometry and LSPR. Journal of Lightwave Technology
Academic article
Wahl, Markus Solberg; Wilhelmsen, Øivind; Hjelme, Dag Roar. (2018) Combined temperature and RI sensor for exploring the phase transitions of ethanol solutions. Optics Info Base, Optical Society of America
Academic chapter/article/Conference paper
Milenko, Karolina Barbara; Larsen Jernelv, Ine; Fuglerud, Silje Skeide; Aksnes, Astrid; Ellingsen, Reinold; Hjelme, Dag Roar. (2018) Towards Fiber-Optic Raman Spectroscopy for Glucose Sensing. Optics Info Base, Optical Society of America
Academic chapter/article/Conference paper
Larsen Jernelv, Ine; Milenko, Karolina Barbara; Ellingsen, Reinold; Hjelme, Dag Roar; Aksnes, Astrid. (2018) Improving Multivariate Analysis in Mid-Infrared Spectroscopy for Biosensing. Optics Info Base, Optical Society of America
Academic chapter/article/Conference paper
Jernelv, Ine Larsen; Milenko, Karolina Barbara; Fuglerud, Silje Skeide; Hjelme, Dag Roar; Ellingsen, Reinold; Aksnes, Astrid. (2018) A review of optical methods for continuous glucose monitoring. Applied spectroscopy reviews (Softcover ed.)
Academic literature review
Åm, Marte Kierulf; Kölle, Konstanze; Fougner, Anders Lyngvi; Dirnena-Fusini, Ilze; Bösch, Patrick Christian; Ellingsen, Reinold. (2018) Effect of sensor location on continuous intraperitoneal glucose sensing in an animal model. PLOS ONE
Academic article
Lamb, Jacob Joseph; Sarker, Shiplu; Hjelme, Dag Roar; Lien, Kristian Myklebust. (2018) Fermentative Bioethanol Production Using Enzymatically Hydrolysed Saccharina latissima. Advances in microbiology
Academic article
Fuglerud, Silje Skeide; Milenko, Karolina Barbara; Larsen Jernelv, Ine; Ellingsen, Reinold; Aksnes, Astrid; Hjelme, Dag Roar. (2018) A miniaturized ball-lensed fiber optic NIR transmission spectroscopy-based glucose sensor. Optics Info Base, Optical Society of America
Academic chapter/article/Conference paper
Yadav, Mukesh; Høvik, Jens; Hjelme, Dag Roar; Aksnes, Astrid. (2018) Sensitivity enhanced biophotonic sensor utilizing sub-wavelength gratings. Proceedings of SPIE, the International Society for Optical Engineering
Academic article

2011

Skjærvold, Nils Kristian; Solligård, Erik; Hjelme, Dag Roar; Aadahl, Petter. (2011) Continuous Measurement of Blood Glucose Validation of a New Intravascular Sensor. Anesthesiology
Academic article
Hjelme, Dag Roar; Lydersen, Lars Vincent Van de Wiel; Makarov, Vadim. (2011) Quantum Cryptography. CRC Press
Academic chapter/article/Conference paper

2010

Tuft, Vegard Larsen; Hjelme, Dag Roar; Bjørnstad, Steinar. (2010) Automatic Polarization Control With Packet Transmission and the Effect of Traffic Patterns. Journal of Lightwave Technology
Academic article

2009

Tierney, Sven; Falch, Berit H.; Hjelme, Dag Roar; Stokke, Bjørn Torger. (2009) Determination of Glucose Levels Using a Functionalized Hydrogel-Optical Fiber Biosensor: Toward Continuous Monitoring of Blood Glucose in Vivo. Analytical Chemistry
Academic article
Tuft, Vegard Larsen; Bjørnstad, Steinar; Hjelme, Dag Roar. (2009) Effect of traffic patterns on automatic polarization control with polarization and time-division multiplexed optical packet transmission. Journal of Optical Networking
Academic article

2008

Tierney, Sven; Hjelme, DR; Stokke, Bjørn Torger. (2008) Determination of swelling of responsive gels with nanometer resolution. Fiber-optic based platform for hydrogels as signal transducers. Analytical Chemistry
Academic article

2007

Bjørnstad, Steinar; Nord, Martin; Eriksen, Lars Erik; Tuft, Vegard Larsen; Hjelme, Dag Roar; Stol, Norvald. (2007) Demonstration and analysis of TV- and data transport in the OpMiGua hybrid circuit/packet switched network testbed.
Academic chapter/article/Conference paper
Larsen, Eivind La Puebla; Randeberg, Lise Lyngsnes; Gederaas, Odrun Arna; Krokan, Hans Einar; Hjelme, Dag Roar; Svaasand, Lars O.. (2007) In vitro study on methemoglobin formation in erythrocytes following hexyl-aminolevulinate induced photodynamic therapy. SPIE - The International Society for Optics and Photonics
Academic chapter/article/Conference paper
Tuft, Vegard Larsen; Bjørnstad, Steinar; Hjelme, Dag Roar. (2007) Automatic polarization control for packet transmission in a hybrid circuit and packet switched optical network. IEEE Photonics Technology Letters
Academic article

2006

Larsen, Eivind La Puebla; Randeberg, Lise Lyngsnes; Gederaas, Odrun Arna; Arum, Carl-Jørgen; Krokan, Hans Einar; Chen, Duan. (2006) Monitoring of hALA induced PDT in rat bladder cancer by optical spectroscopy. Lasers in Surgery and Medicine
Abstract
Bjørnstad, Steinar; Hjelme, Dag Roar; Stol, Norvald. (2006) A Packet-Switched Hybrid Optical Network with Service Guarantees. IEEE Journal on Selected Areas in Communications
Academic article
Nord, Martin; Bjornstad, Steinar; Bjørnstad, Steinar; Austad, Oddgeir; Tuft, Vegard Larsen; Hjelme, Dag Roar. (2006) OpMiGua Hybrid Circuit- and Packet-Switched Test-Bed Demonstration and Performance. IEEE Photonics Technology Letters
Academic article
Nord, Martin; Bjørnstad, Steinar; Tuft, Vegard; Kimsås, Andreas; Hjelme, Dag Roar; Eriksen, Lars Erik. (2006) The OpMiGua project - final report. Telenor FoU report (Rxx)
Report
Tuft, Vegard Larsen; Buron, Jakob; Hjelme, Dag Roar; Bjørnstad, Steinar. (2006) Demonstration of an All-Optical Class-of-Service Segregation Method for Edge Nodes in Hybrid Circuit/Packet Switched Networks. Institution of Electrical Engineers (IEE)
Academic chapter/article/Conference paper
Bjørnstad, Steinar; Nord, Martin; Tuft, Vegard Larsen; Austad, Oddgeir; Hjelme, Dag Roar; Eriksen, Lars Erik. (2006) Experimental Demonstration of OpMiGua Hybrid Circuit/Packet Nodes. Institution of Electrical Engineers (IEE)
Academic chapter/article/Conference paper
Tuft, Vegard Larsen; Hjelme, Dag Roar. (2006) The Effect of PDL in a Polarization and Time Division Multiplexed Scheme for All-Optical Class of Service Segregation. IEEE Press
Academic chapter/article/Conference paper
Bjørnstad, Steinar; Eriksen, Lars Erik; Hjelme, Dag Roar. (2006) The OpMiGua multiservice optical hybrid packet/circuit switched network supporting TV-broadcasting QoS requirements. IEEE Press
Academic chapter/article/Conference paper
Nord, Martin; Bjørnstad, Steinar; Austad, Oddgeir; Tuft, Vegard; Hjelme, Dag roar; Sudbø, Aasmund Sveinung. (2006) Hybrid circuit- and packet switched test-bed. IEEE Photonics Technology Letters
Academic article

2005

Makarov, Vadim; Hjelme, Dag Roar. (2005) Faked states attack on quantum cryptosystems. Journal of Modern Optics
Academic article
Bjørnstad, Steinar; Nord, Martin; Olsen, Torodd; Hjelme, Dag Roar; Stol, Norvald. (2005) Burst, packet and hybrid switching in the optical core network. Telektronikk
Academic article
Tuft, Vegard Larsen; Bjørnstad, Steinar; Hjelme, Dag Roar. (2005) Time Interleaved Polarization Multiplexing for Polarization Labelling.
Other
Bjørnstad, Steinar; Øverby, Harald; Stol, Norvald; Hjelme, Dag Roar. (2005) Protecting guaranteed service traffic in an OpMiGua hybrid network. Institution of Electrical Engineers (IEE)
Academic chapter/article/Conference paper

2004

Makarov, Vadim; Brylevski, Alexey; Hjelme, Dag Roar. (2004) Real-time phase tracking in single-photon interferometers. Applied Optics
Academic article

2001

Vakhitov, Artem; Makarov, Vadim; Hjelme, Dag Roar. (2001) Large pulse attack as a method of conventional optical eavesdropping in quantum cryptography. Journal of Modern Optics
Academic article

1998

Hjelme, Dag Roar; Storøy, Helge; Skaar, Johannes. (1998) Reconfigurable all-optical crossconnect node using synthesized fiber Bragg gratings for both demultiplexing and switching. OSA Trends in Optics and Photonics
Academic article

Journal publications

Jerve, Fredrik Wilsbeck; Hjelme, Dag Roar; Kalvøy, Håvard; Allen, John; Tronstad, Christian. (2024) Exploration of the Conditions for Occurrence of Photoplethysmographic Signal Inversion above the Dorsalis Pedis Artery. Sensors
Academic article
Grayson, Michael; Krueper, Greg; Xu, Bo; Zohrabi, Mo; Hjelme, Dag Roar; Gopinath, Juliet. (2023) On-chip mid-infrared optical sensing with GeSbSe waveguides and resonators. Optics Express
Academic article
Urban, David; Marcucci, Niccolò; Wölfle, Christoph Hubertus; Torgersen, Jan; Hjelme, Dag Roar; Descrovi, Emiliano. (2023) Polarization-driven reversible actuation in a photo-responsive polymer composite. Nature Communications
Academic article
Urban, David; Hjelme, Dag Roar; Descrovi, Emiliano. (2022) Polarized light guiding anisotropic deformation and relaxation in photosensitive polymeric substrates . The European Physical Journal Conferences
Abstract
Schwermer, Silje Fuglerud; Noh, Jong Wook; Aksnes, Astrid; Hjelme, Dag Roar. (2022) Performance improvement in a supercontinuum fiber-coupled system for near infrared absorption spectroscopy. Applied Optics
Academic article
Muri, Harald Ian; Hjelme, Dag Roar. (2022) Sensor Technology Options for Municipal Solid Waste Characterization for Optimal Operation of Waste-to-Energy Plants. Energies
Academic article
Osinski, Dominik; Łukowska, Marta; Hjelme, Dag Roar; Michał, Wierzchoń. (2021) Colorophone 2.0: A Wearable Color Sonification Device Generating Live Stereo-Soundscapes—Design, Implementation, and Usability Audit . Sensors
Academic article
Fuglerud, Silje Skeide; Ellingsen, Reinold; Aksnes, Astrid; Hjelme, Dag Roar. (2021) Investigation of the effect of clinically relevant interferents on glucose monitoring using near‐infrared spectroscopy. Journal of Biophotonics
Academic article
Milenko, Karolina Barbara; Yerolatsitis, Stephanos; Aksnes, Astrid; Hjelme, Dag Roar; Stone, James M.. (2021) Micro-lensed negative-curvature fibre probe for raman spectroscopy. Sensors
Academic article
Yadav, Mukesh; Noh, Jong Wook; Hjelme, Dag Roar; Aksnes, Astrid. (2021) Spectral shaping of ring resonator transmission response. Optics Express
Academic article
Muri, Harald Ian; Hjelme, Dag Roar. (2021) Classification of municipal solid waste using deep convolutional neural network model applied to multispectral images. Proceedings of SPIE, the International Society for Optical Engineering
Academic article
Wahl, Markus Solberg; Wilhelmsen, Øivind; Hjelme, Dag Roar. (2020) Using Fiber-Optic Sensors to Give Insight into Liquid-Solid Phase Transitions in Pure Fluids and Mixtures. Experimental Thermal and Fluid Science
Academic article
Fuglerud, Silje Skeide; Milenko, Karolina Barbara; Aksnes, Astrid; Hjelme, Dag Roar. (2020) Surface-Enhanced Absorption Spectroscopy for Optical Fiber Sensing. Materials
Academic article
Jernelv, Ine Larsen; Strøm, Karina; Hjelme, Dag Roar; Aksnes, Astrid. (2020) Mid-infrared spectroscopy with a fiber-coupled tuneable quantum cascade laser for glucose sensing. Proceedings of SPIE, the International Society for Optical Engineering
Academic article
Wahl, Markus Solberg; Aasen, Ailo; Hjelme, Dag Roar; Wilhelmsen, Øivind. (2020) Ice formation and growth in supercooled water–alcohol mixtures: Theory and experiments with dual fiber sensors. Fluid Phase Equilibria
Academic article
Jernelv, Ine Larsen; Høvik, Jens; Hjelme, Dag Roar; Aksnes, Astrid. (2020) Signal enhancement in microstructured silicon attenuated total reflection elements with quantum cascade laser-based spectroscopy. Proceedings of SPIE, the International Society for Optical Engineering
Academic article
Jernelv, Ine Larsen; Hjelme, Dag Roar; Aksnes, Astrid. (2020) Infrared measurements of glucose in peritoneal fluid with a tuneable quantum cascade laser. Biomedical Optics Express
Academic article
Jernelv, Ine Larsen; Hjelme, Dag Roar; Matsuura, Yuji; Aksnes, Astrid. (2020) Convolutional neural networks for classification and regression analysis of one-dimensional spectral data. arXiv.org
Academic article
Milenko, Karolina Barbara; Fuglerud, Silje Skeide; Aksnes, Astrid; Ellingsen, Reinold; Hjelme, Dag Roar. (2020) Optimization of SERS Sensing With Micro-Lensed Optical Fibers and Au Nano-Film. Journal of Lightwave Technology
Academic article
Fuglerud, Silje Skeide; Milenko, Karolina Barbara; Ellingsen, Reinold; Aksnes, Astrid; Hjelme, Dag Roar. (2019) Glucose sensing by absorption spectroscopy using lensed optical fibers. Applied Optics
Academic article
Sarker, Shiplu; Lamb, Jacob Joseph; Hjelme, Dag Roar; Lien, Kristian Myklebust. (2019) A review of the role of critical parameters in the design and operation of biogas production plants. Applied Sciences
Academic literature review
Lamb, Jacob Joseph; Bernard, Olivier; Sarker, Shiplu; Lien, Kristian Myklebust; Hjelme, Dag Roar. (2019) Perspectives of optical colourimetric sensors for anaerobic digestion. Renewable and Sustainable Energy Reviews
Academic literature review
Lamb, Jacob Joseph; Lien, Kristian Myklebust; Hjelme, Dag Roar. (2019) Digitalization of colourimetric sensor arrays for volatile fatty acid detection in anaerobic digestion. MethodsX
Academic article
Lamb, Jacob Joseph; Islam, Md Hujjatul; Hjelme, Dag Roar; Pollet, Bruno; Lien, Kristian Myklebust. (2019) Effect of power ultrasound and Fenton reagents on the biomethane potential from steam-exploded birchwood. Ultrasonics sonochemistry
Academic article
Lamb, Jacob Joseph; Bernard, Olivier; Sarker, Shiplu; Lien, Kristian Myklebust; Hjelme, Dag Roar. (2019) Perspectives of surface plasmon resonance sensors for optimized biogas methanation. Engineering in Life Sciences
Academic literature review
Wahl, Markus Solberg; Wilhelmsen, Øivind; Hjelme, Dag Roar. (2019) Addressing Challenges in Fabricating Reflection-Based Fiber Optic Interferometers. Sensors
Academic article
Lamb, Jacob Joseph; Hjelme, Dag Roar; Lien, Kristian Myklebust. (2019) Carbohydrate Yield and Biomethane Potential from Enzymatically Hydrolysed Saccharina latissima and Its Industrial Potential. Advances in microbiology
Academic article
Fuglerud, Silje Skeide; Milenko, Karolina Barbara; Ellingsen, Reinold; Aksnes, Astrid; Hjelme, Dag Roar. (2019) Feasibility of supercontinuum sources for use in glucose sensing by absorption spectroscopy. Proceedings of SPIE, the International Society for Optical Engineering
Academic article
Åm, Marte Kierulf; Fougner, Anders Lyngvi; Ellingsen, Reinold; Hjelme, Dag Roar; Bösch, Patrick Christian; Stavdahl, Øyvind. (2019) Why intraperitoneal glucose sensing is sometimes surprisingly rapid and sometimes slow: A hypothesis . Medical Hypotheses
Academic article
Åm, Marte Kierulf; Fougner, Anders Lyngvi; Ellingsen, Reinold; Hjelme, Dag Roar; Bösch, Patrick Christian; Stavdahl, Øyvind. (2019) Erratum to “Why intraperitoneal glucose sensing is sometimes surprisingly rapid and sometimes slow: A hypothesis” [Med. Hypotheses 132 (2019) 109318]. Medical Hypotheses
Errata
Jernelv, Ine Larsen; Strøm, Karina; Hjelme, Dag Roar; Aksnes, Astrid. (2019) Infrared Spectroscopy with a Fiber-Coupled Quantum Cascade Laser for Attenuated Total Reflection Measurements Towards Biomedical Applications. Sensors
Academic article
Sarker, Shiplu; Lamb, Jacob Joseph; Hjelme, Dag Roar; Lien, Kristian Myklebust. (2018) Overview of recent progress towards in-situ biogas upgradation techniques. Fuel
Academic literature review
Milenko, Karolina Barbara; Fuglerud, Silje Skeide; Kjeldby, Snorre Braathen; Ellingsen, Reinold; Aksnes, Astrid; Hjelme, Dag Roar. (2018) Micro-lensed optical fibers for a surface-enhanced Raman scattering sensing probe. Optics Letters
Academic article
Muri, Harald Ian; Hoang, Linh; Hjelme, Dag Roar. (2018) Mapping nanoparticles in hydrogels: A comparison of preparation methods for electron microscopy. Applied Sciences
Academic article
Muri, Harald Ian; Bano, Andon; Hjelme, Dag Roar. (2018) LSPR and Interferometric Sensor Modalities Combined Using a Double-Clad Optical Fiber. Sensors
Academic article
Muri, Harald Ian; Bano, Andon; Hjelme, Dag Roar. (2018) A single-point, multiparameter, fiber optic sensor based on a combination of interferometry and LSPR. Journal of Lightwave Technology
Academic article
Jernelv, Ine Larsen; Milenko, Karolina Barbara; Fuglerud, Silje Skeide; Hjelme, Dag Roar; Ellingsen, Reinold; Aksnes, Astrid. (2018) A review of optical methods for continuous glucose monitoring. Applied spectroscopy reviews (Softcover ed.)
Academic literature review
Åm, Marte Kierulf; Kölle, Konstanze; Fougner, Anders Lyngvi; Dirnena-Fusini, Ilze; Bösch, Patrick Christian; Ellingsen, Reinold. (2018) Effect of sensor location on continuous intraperitoneal glucose sensing in an animal model. PLOS ONE
Academic article
Lamb, Jacob Joseph; Sarker, Shiplu; Hjelme, Dag Roar; Lien, Kristian Myklebust. (2018) Fermentative Bioethanol Production Using Enzymatically Hydrolysed Saccharina latissima. Advances in microbiology
Academic article
Yadav, Mukesh; Høvik, Jens; Hjelme, Dag Roar; Aksnes, Astrid. (2018) Sensitivity enhanced biophotonic sensor utilizing sub-wavelength gratings. Proceedings of SPIE, the International Society for Optical Engineering
Academic article
Muri, Harald Ian; Hjelme, Dag Roar. (2017) LSPR Coupling and Distribution of Interparticle Distances between Nanoparticles in Hydrogel on Optical Fiber End Face. Sensors
Academic article
Hammarling, Krister; Engholm, Magnus; Muri, Harald Ian; Wahl, Markus Solberg; Hjelme, Dag Roar. (2017) Dual parameter fiber optic sensor combining a Fabry-Perot and a Mach-Zehnder interferometer. Proceedings of IEEE Sensors
Academic article
Muri, Harald Ian; Bano, Andon; Hjelme, Dag Roar. (2017) Interferometric and localized surface plasmon based fiber optic sensor. Progress in Biomedical Optics and Imaging
Academic article
Muri, Harald Ian; Bano, Andon; Hjelme, Dag Roar. (2017) First step towards an interferometric and localized surface plasmon fiber optic sensor. Proceedings of SPIE, the International Society for Optical Engineering
Academic article
Bartholsen, Ingebrigt; Hjelme, Dag Roar. (2016) Fast and accurate read-out of interferometric optical fiber sensors. Proceedings of SPIE, the International Society for Optical Engineering
Academic article
Muri, Ian; Hjelme, Dag Roar. (2016) Novel localized surface plasmon resonance based optical fiber sensor. Proceedings of SPIE, the International Society for Optical Engineering
Academic article
Fougner, Anders Lyngvi; Kölle, Konstanze; Skjaervold, Nils Kristian; Elvemo, Nicolas-Andreas L.; Hjelme, Dag Roar; Ellingsen, Reinold. (2016) Intraperitoneal Glucose Sensing is Sometimes Surprisingly Rapid. MIC Journal: Modeling, Identification and Control
Academic article
Strømstad, Håkon Grøn; Hjelme, Dag Roar. (2015) Low-cost high performance readout system for fiber-optic biosensors. Progress in Biomedical Optics and Imaging
Academic article
Eriksen, Anders; Osinski, Dominik; Hjelme, Dag Roar. (2014) Evaluation of thermal imaging system and thermal radiation detector for real-time condition monitoring of high power frequency converters. Advances in Manufacturing
Academic article
Eriksen, Anders; Osinski, Dominik; Hjelme, Dag Roar. (2013) Evaluation of thermal imaging system and thermal radiation detector for real-time condition monitoring of highpower frequency converters. NTNU Engineering Series
Academic article
Skjaervold, Nils Kristian; Østling, Dan; Hjelme, Dag Roar; Spigset, Olav; Lyng, Oddveig; Aadahl, Petter. (2013) Blood Glucose Control Using a Novel Continuous Blood Glucose Monitor and Repetitive Intravenous Insulin Boluses: Exploiting Natural Insulin Pulsatility as a Principle for a Future Artificial Pancreas. International Journal of Endocrinology
Academic article
Veisllari, Raimena; Bjørnstad, Steinar; Hjelme, Dag Roar. (2013) Experimental demonstration of high throughput, ultra-low delay variation packet/circuit fusion network. Electronics Letters
Academic article
Skjærvold, Nils Kristian; Solligård, Erik; Hjelme, Dag Roar; Aadahl, Petter. (2011) Continuous Measurement of Blood Glucose Validation of a New Intravascular Sensor. Anesthesiology
Academic article
Tuft, Vegard Larsen; Hjelme, Dag Roar; Bjørnstad, Steinar. (2010) Automatic Polarization Control With Packet Transmission and the Effect of Traffic Patterns. Journal of Lightwave Technology
Academic article
Tierney, Sven; Falch, Berit H.; Hjelme, Dag Roar; Stokke, Bjørn Torger. (2009) Determination of Glucose Levels Using a Functionalized Hydrogel-Optical Fiber Biosensor: Toward Continuous Monitoring of Blood Glucose in Vivo. Analytical Chemistry
Academic article
Tuft, Vegard Larsen; Bjørnstad, Steinar; Hjelme, Dag Roar. (2009) Effect of traffic patterns on automatic polarization control with polarization and time-division multiplexed optical packet transmission. Journal of Optical Networking
Academic article
Tierney, Sven; Hjelme, DR; Stokke, Bjørn Torger. (2008) Determination of swelling of responsive gels with nanometer resolution. Fiber-optic based platform for hydrogels as signal transducers. Analytical Chemistry
Academic article
Tuft, Vegard Larsen; Bjørnstad, Steinar; Hjelme, Dag Roar. (2007) Automatic polarization control for packet transmission in a hybrid circuit and packet switched optical network. IEEE Photonics Technology Letters
Academic article
Larsen, Eivind La Puebla; Randeberg, Lise Lyngsnes; Gederaas, Odrun Arna; Arum, Carl-Jørgen; Krokan, Hans Einar; Chen, Duan. (2006) Monitoring of hALA induced PDT in rat bladder cancer by optical spectroscopy. Lasers in Surgery and Medicine
Abstract
Bjørnstad, Steinar; Hjelme, Dag Roar; Stol, Norvald. (2006) A Packet-Switched Hybrid Optical Network with Service Guarantees. IEEE Journal on Selected Areas in Communications
Academic article
Nord, Martin; Bjornstad, Steinar; Bjørnstad, Steinar; Austad, Oddgeir; Tuft, Vegard Larsen; Hjelme, Dag Roar. (2006) OpMiGua Hybrid Circuit- and Packet-Switched Test-Bed Demonstration and Performance. IEEE Photonics Technology Letters
Academic article
Nord, Martin; Bjørnstad, Steinar; Austad, Oddgeir; Tuft, Vegard; Hjelme, Dag roar; Sudbø, Aasmund Sveinung. (2006) Hybrid circuit- and packet switched test-bed. IEEE Photonics Technology Letters
Academic article
Makarov, Vadim; Hjelme, Dag Roar. (2005) Faked states attack on quantum cryptosystems. Journal of Modern Optics
Academic article
Bjørnstad, Steinar; Nord, Martin; Olsen, Torodd; Hjelme, Dag Roar; Stol, Norvald. (2005) Burst, packet and hybrid switching in the optical core network. Telektronikk
Academic article
Makarov, Vadim; Brylevski, Alexey; Hjelme, Dag Roar. (2004) Real-time phase tracking in single-photon interferometers. Applied Optics
Academic article
Vakhitov, Artem; Makarov, Vadim; Hjelme, Dag Roar. (2001) Large pulse attack as a method of conventional optical eavesdropping in quantum cryptography. Journal of Modern Optics
Academic article
Hjelme, Dag Roar; Storøy, Helge; Skaar, Johannes. (1998) Reconfigurable all-optical crossconnect node using synthesized fiber Bragg gratings for both demultiplexing and switching. OSA Trends in Optics and Photonics
Academic article

Part of book/report

Muri, Harald Ian; Wahl, Markus Solberg; Lamb, Jacob Joseph; Snilsberg, Rolf Kristian; Hjelme, Dag Roar. (2020) Sensor fusion. Springer
Academic chapter/article/Conference paper
Wahl, Markus Solberg; Muri, Harald Ian; Snilsberg, Rolf Kristian; Lamb, Jacob Joseph; Hjelme, Dag Roar. (2020) Temperature and humidity measurements. Springer
Academic chapter/article/Conference paper
Lamb, Jacob Joseph; Burheim, Odne Stokke; Hjelme, Dag Roar. (2020) Introduction. Springer
Academic chapter/article/Conference paper
Muri, Harald Ian; Lamb, Jacob Joseph; Wahl, Markus Solberg; Snilsberg, Rolf Kristian; Hjelme, Dag Roar. (2020) Hydrogen gas measurements. Springer
Academic chapter/article/Conference paper
Wahl, Markus Solberg; Lamb, Jacob Joseph; Muri, Harald Ian; Snilsberg, Rolf Kristian; Hjelme, Dag Roar. (2020) Light properties and sensors. Springer
Academic chapter/article/Conference paper
Wahl, Markus Solberg; Wilhelmsen, Øivind; Hjelme, Dag Roar. (2018) Combined temperature and RI sensor for exploring the phase transitions of ethanol solutions. Optics Info Base, Optical Society of America
Academic chapter/article/Conference paper
Milenko, Karolina Barbara; Larsen Jernelv, Ine; Fuglerud, Silje Skeide; Aksnes, Astrid; Ellingsen, Reinold; Hjelme, Dag Roar. (2018) Towards Fiber-Optic Raman Spectroscopy for Glucose Sensing. Optics Info Base, Optical Society of America
Academic chapter/article/Conference paper
Larsen Jernelv, Ine; Milenko, Karolina Barbara; Ellingsen, Reinold; Hjelme, Dag Roar; Aksnes, Astrid. (2018) Improving Multivariate Analysis in Mid-Infrared Spectroscopy for Biosensing. Optics Info Base, Optical Society of America
Academic chapter/article/Conference paper
Fuglerud, Silje Skeide; Milenko, Karolina Barbara; Larsen Jernelv, Ine; Ellingsen, Reinold; Aksnes, Astrid; Hjelme, Dag Roar. (2018) A miniaturized ball-lensed fiber optic NIR transmission spectroscopy-based glucose sensor. Optics Info Base, Optical Society of America
Academic chapter/article/Conference paper
Hjelme, Dag Roar; Lydersen, Lars Vincent Van de Wiel; Makarov, Vadim. (2011) Quantum Cryptography. CRC Press
Academic chapter/article/Conference paper
Bjørnstad, Steinar; Nord, Martin; Eriksen, Lars Erik; Tuft, Vegard Larsen; Hjelme, Dag Roar; Stol, Norvald. (2007) Demonstration and analysis of TV- and data transport in the OpMiGua hybrid circuit/packet switched network testbed.
Academic chapter/article/Conference paper
Larsen, Eivind La Puebla; Randeberg, Lise Lyngsnes; Gederaas, Odrun Arna; Krokan, Hans Einar; Hjelme, Dag Roar; Svaasand, Lars O.. (2007) In vitro study on methemoglobin formation in erythrocytes following hexyl-aminolevulinate induced photodynamic therapy. SPIE - The International Society for Optics and Photonics
Academic chapter/article/Conference paper
Tuft, Vegard Larsen; Buron, Jakob; Hjelme, Dag Roar; Bjørnstad, Steinar. (2006) Demonstration of an All-Optical Class-of-Service Segregation Method for Edge Nodes in Hybrid Circuit/Packet Switched Networks. Institution of Electrical Engineers (IEE)
Academic chapter/article/Conference paper
Bjørnstad, Steinar; Nord, Martin; Tuft, Vegard Larsen; Austad, Oddgeir; Hjelme, Dag Roar; Eriksen, Lars Erik. (2006) Experimental Demonstration of OpMiGua Hybrid Circuit/Packet Nodes. Institution of Electrical Engineers (IEE)
Academic chapter/article/Conference paper
Tuft, Vegard Larsen; Hjelme, Dag Roar. (2006) The Effect of PDL in a Polarization and Time Division Multiplexed Scheme for All-Optical Class of Service Segregation. IEEE Press
Academic chapter/article/Conference paper
Bjørnstad, Steinar; Eriksen, Lars Erik; Hjelme, Dag Roar. (2006) The OpMiGua multiservice optical hybrid packet/circuit switched network supporting TV-broadcasting QoS requirements. IEEE Press
Academic chapter/article/Conference paper
Tuft, Vegard Larsen; Bjørnstad, Steinar; Hjelme, Dag Roar. (2005) Time Interleaved Polarization Multiplexing for Polarization Labelling.
Other
Bjørnstad, Steinar; Øverby, Harald; Stol, Norvald; Hjelme, Dag Roar. (2005) Protecting guaranteed service traffic in an OpMiGua hybrid network. Institution of Electrical Engineers (IEE)
Academic chapter/article/Conference paper

Report

Schwermer, Silje Fuglerud; Hjelme, Dag Roar; Aksnes, Astrid; Milenko, Karolina Barbara. (2022) Near Infrared Spectroscopy for Continuous Glucose Monitoring. Doctoral theses at NTNU (184)
Doctoral dissertation
Jernelv, Ine Larsen; Hjelme, Dag Roar; Aksnes, Astrid. (2020) Mid-Infrared Tuneable Laser Spectroscopy for Glucose Sensing. Doktoravhandlinger ved NTNU (ISSN 1503-8181)
Doctoral dissertation
saldana, diego sanchez; Hjelme, Dag Roar. (2018) online sensor concept for municipal solid waste characterization review. NTNU and ENERSENSE
Report
Nord, Martin; Bjørnstad, Steinar; Tuft, Vegard; Kimsås, Andreas; Hjelme, Dag Roar; Eriksen, Lars Erik. (2006) The OpMiGua project - final report. Telenor FoU report (Rxx)
Report

Teaching

Courses

Outreach

2025

Academic lecture

Fried, Michael Aron; Hjelme, Dag Roar. (2025) Novel tunable diode laser spectroscopy with square wave injection current modulation and simple calibration. SPIE SPIE Photonic West , San Francisco 2025-01-17 - 2025-04-22

2024

Academic lecture

Yadav, Mukesh; Hjelme, Dag Roar; Aksnes, Astrid. (2024) Optical On-chip Xenobiotic Sensor. Norwegian Physical Society Norwegian Electro-optics Meeting 2024 , Oscarsborg Fortress Hotel and Resort, Oslo 2024-05-21 - 2024-05-24
Interview

Normannsen, Sølvi Waterloo; Carlsen, Sven Magnus; Berg, Hilde Kjeldstad; Stavdahl, Øyvind; Ellingsen, Reinold; Hjelme, Dag Roar. (2024) A new insulin mixture could make life easier for patients with type 1 diabetes. Norwegian SciTech News Norwegian SciTech News [Business/trade/industry journal] 2024-01-04
Interview

Normannsen, Sølvi Waterloo; Carlsen, Sven Magnus; Berg, Hilde Kjeldstad; Stavdahl, Øyvind; Ellingsen, Reinold; Hjelme, Dag Roar. (2024) Ny insulin-miks kan gi pasienter med diabetes type 1 et lettere liv. Gemini Gemini [Business/trade/industry journal] 2024-01-04
Academic lecture

Bjørnstad, Steinar; Vaskinn, Kristina Skarvang; Hjelme, Dag Roar; Tunheim, Asbjørn; Fjermestad, Frode; Østerli, Eivind. (2024) First Impact Movement Characterization of Shallow Buried Live Subsea-Cable. 2024 Optical Fiber Communications Conference and Exhibition (OFC) , San Diego, CA 2024-03-24 - 2024-03-28
Academic lecture

Vaskinn, Kristina Skarvang; Bjørnstad, Steinar; Sæthre, Erik; Hjelme, Dag Roar. (2024) Local Wind Impact Sensing using State of Polarization Measurement on a Live Short-Haul Aerial Fibre Cable. 2024 Optical Fiber Communications Conference and Exhibition (OFC) , San Diego, CA 2024-03-24 - 2024-03-28
Academic lecture

Vaskinn, Kristina Skarvang; Elson, Daniel J.; Beppu, Shohei; Soma, Daiki; Bjørnstad, Steinar; Hjelme, Dag Roar. (2024) Earthquake Detection using State-of-Polarisation Sensing on Aerial Cable. 50th European Conference on Optical Communication (ECOC 2024) , Frankfurt 2024-09-22 - 2024-09-26
Interview

Normannsen, Sølvi Waterloo; Carlsen, Sven Magnus; Berg, Hilde Kjeldstad; Stavdahl, Øyvind; Ellingsen, Reinold; Hjelme, Dag Roar. (2024) Ny insulin-miks kan gi pasienter med diabetes type 1 et lettere liv. Forskning.no Forskning.no [Internet] 2024-01-14
Interview

Carlsen, Sven Magnus; Berg, Hilde Kjeldstad; Stavdahl, Øyvind; Ellingsen, Reinold; Hjelme, Dag Roar; Christiansen, Sverre Christian. (2024) Norsk forskning: Ny medisin kan forenkle livet til type 1-diabetikere. VG Pluss VG Pluss [Internet] 2024-02-08
Interview

Carlsen, Sven Magnus; Berg, Hilde Kjeldstad; Stavdahl, Øyvind; Ellingsen, Reinold; Hjelme, Dag Roar; Christiansen, Sverre Christian. (2024) New formulation of insulin may speed up its action for people with type 1 diabetes. Breakthrough T1D Research News Breakthrough T1D Research News [Internet] 2024-03-25

2023

Lecture

Skarvang, Kristina Shizuka Yamase; Bjørnstad, Steinar; Rørstadbotnen, Robin Andre; Bozorgebrahimi, Kurosh; Hjelme, Dag Roar. (2023) Observation of Local Small Magnitude Earthquakes using State Of Polarization Monitoring in a 250km Passive Arctic Submarine Communication Cable. IEEE 2023 Optical Fiber Communications Conference and Exhibition (OFC) , San Diego, CA 2023-03-05 - 2023-03-09
Lecture

Skarvang, Kristina Shizuka Yamase; Bjørnstad, Steinar; Rørstadbotnen, Robin Andre; Bozorgebrahimi, Kurosh; Brenne, Jan Kristoffer; Hjelme, Dag Roar. (2023) Comparing Sensitivity of State Of Polarization Monitoring and Distributed Acoustic Sensing in the Svalbard Arctic Submarine Communication Cable. SubOptic 2023 , Bangkok 2023-03-13 - 2023-03-16
Lecture

Skarvang, Kristina Shizuka Yamase; Bjørnstad, Steinar; Hjelme, Dag Roar. (2023) A Practical Approach to Vibration Monitoring on a Metro Length Fiber Cable Using Low-Cost State of Polarization Monitoring. 2023 IEEE Photonics Society Summer Tropicals Meeting Series (SUM) , Sicily 2023-07-17 - 2023-07-19
Academic lecture

Urban, David; Hjelme, Dag Roar; Descrovi, Emiliano. (2023) Polarization-driven reversible deformation in an azopolymer-elastomer composite. 4th International Conference on Photoalignment and Photopatterning in Soft Materials , St. Petersburg, Florida 2023-12-10 - 2023-12-16
Academic lecture

Urban, David; Hjelme, Dag Roar; Descrovi, Emiliano. (2023) Polarization-driven reversible deformation in a light-responsive amorphous polymer blend. European Physical Society (EPS), Optica and IEEE Photonics Society CLEO Europe/Europe-EQEC , München 2023-06-26 - 2023-06-30
Academic lecture

Urban, David; Hjelme, Dag Roar; Descrovi, Emiliano. (2023) Light-responsive azopolymer-based metamaterials as locally, anisotropically, and reversibly stretchable polymer substrates. EMRS, SYMPOSIUM H Advanced strategies for smart functional and multifunctional biomaterials and biointerfaces European Materials Research Society (EMRS) Spring Meeting 2023 , Strasbourg 2023-05-29 - 2023-06-02

2022

Academic lecture

Urban, David; Hjelme, Dag Roar; Descrovi, Emiliano. (2022) Polarized light guiding anisotropic deformation and relaxation in photosensitive polymeric substrates. EOS European Optical Society EOS Annual Meeting 2022 , Porto 2022-09-12 - 2022-09-16
Academic lecture

Wahl, Markus Solberg; Boucher, Susanne Aspen; Lamb, Jacob Joseph; Sundby, Eirik; Thomas, Peter James; Hjelme, Dag Roar. (2022) Towards in-situ state of health monitoring of lithium-ion batteries using internal fiber-optic sensors. The Electrochemical Society 241st ECS Meeting , Vancouver, Canada 2022-05-29 - 2022-06-02
Academic lecture

Grayson, Michael; Krueper, Greg; Xu, Bo; Hjelme, Dag Roar; Gopinath, Juliet; Park, Wounjhang. (2022) GeSbSe Devices for Mid-Infrared Optical Sensing. Optica Optical Sensors 2022 , Vancouver, British Columbia 2022-07-11 - 2022-07-15

2021

Poster

Fuglerud, Silje Skeide; Ellingsen, Reinold; Aksnes, Astrid; Hjelme, Dag Roar. (2021) Interfering substances for glucose sensing by near-infrared spectroscopy. Kernes ATTD , Digital 2021-06-02 - 2021-06-05
Academic lecture

Fuglerud, Silje Skeide; Hjelme, Dag Roar. (2021) Towards Remote Fiber-Based In Vivo Sensing of Glucose by Near Infrared Spectroscopy. Optical Society America OSA Optical Sensors and Sensing Congress , Online 2021-07-19 - 2021-07-21
Academic lecture

Fuglerud, Silje Skeide; Hjelme, Dag Roar. (2021) Reducing the SNR for Fiber-Coupled Supercontinuum Absorption Spectroscopy Applied to Glucose Sensing. Laser Components LC week: IR News Flash , Online 2021-12-06 - 2021-12-09
Academic lecture

Fuglerud, Silje Skeide; Hjelme, Dag Roar. (2021) Fiber-based glucose sensing for an artificial pancreas. Laser Components LC talks 2nd infrared sessions 2021-01-19 -
Poster

Muri, Harald Ian; Hjelme, Dag Roar. (2021) Classification of municipal solid waste using deep convolutional neural network model applied to multispectral images. SPIE SPIE Optical Metrology , Munchen 2021-06-21 - 2021-06-25

2020

Academic lecture

Yadav, Mukesh; Noh, Jong Wook; Hjelme, Dag Roar; Aksnes, Astrid. (2020) Hybrid ring resonator sensor with high quality factor and wide dynamic range. OSA The optical Society OSA Optical Sensors and Sensing Congress , Digital 2020-06-22 - 2020-06-26
Academic lecture

Jernelv, Ine Larsen; Strøm, Karina; Hjelme, Dag Roar; Aksnes, Astrid. (2020) Mid-infrared spectroscopy with a fiber-coupled tuneable quantum cascade laser for glucose sensing. SPIE Photonics West , San Francisco 2020-02-01 - 2020-02-06
Academic lecture

Jernelv, Ine Larsen; Høvik, Jens; Hjelme, Dag Roar; Aksnes, Astrid. (2020) Signal enhancement in microstructured silicon attenuated total reflection elements with quantum cascade laser-based spectroscopy. SPIE Photonics Europe 2020-04-06 - 2020-04-10

2019

Poster

Fougner, Anders Lyngvi; Åm, Marte Kierulf; Bösch, Patrick Christian; Christiansen, Sverre; Ellingsen, Reinold; Hjelme, Dag Roar. (2019) Why intraperitoneal glucose sensing is sometimes surprisingly rapid and sometimes slow: A hypothesis. Kenes International Organizers of Congresses S.A. Advanced Technologies & Treatments for Diabetes (ATTD) , Berlin 2019-02-20 - 2019-02-23
Academic lecture

Fuglerud, Silje Skeide; Milenko, Karolina Barbara; Ellingsen, Reinold; Aksnes, Astrid; Martens, Harald Aagaard; Hjelme, Dag Roar. (2019) Aqueous glucose sensing by fiber-based near-infrared spectroscopy. Nofima Scandinavian symposium on Chemometrics 16 , Oslo 2019-06-17 - 2019-06-20
Academic lecture

Fuglerud, Silje Skeide; Milenko, Karolina Barbara; Ellingsen, Reinold; Aksnes, Astrid; Hjelme, Dag Roar. (2019) Feasibility of supercontinuum sources for use in glucose sensing by absorption spectroscopy. SPIE/OSA European Conferences on Biomedical Optics , Munchen 2019-06-23 - 2019-06-27
Lecture

Osinski, Dominik; Bizon, Patrycja; Midtfjord, Helene B.; Wierzchon, Michal; Hjelme, Dag Roar. (2019) Designing Auditory Color Space for Color Sonification Systems. Northumbria University The 25th International Conference on Auditory Display (ICAD 2019) , Newcastle 2019-06-23 - 2019-06-27
Academic lecture

Jernelv, Ine Larsen; Hjelme, Dag Roar; Ellingsen, Reinold; Aksnes, Astrid. (2019) Quantum Cascade Lasers in Biomedicine and Nanotechnology. Nano-Network Nano-Network Workshop , Tromsø 2019-06-17 - 2019-06-19
Poster

Yadav, Mukesh; Høvik, Jens; Noh, Jong Wook; Hjelme, Dag Roar; Aksnes, Astrid. (2019) Silicon photonic waveguide sensor. NTNU Nano, the NanoNetwork, the Research Council of Norway Norwegian Nano Symposium 2019 , Trondheim 2019-10-16 - 2019-10-17
Poster

Aksnes, Astrid; Høvik, Jens; Yadav, Mukesh; Noh, Jong Wook; Arnfinnsdottir, Nina Bjørk; Øvreeide, Ingrid Haga. (2019) Lab-on-a-chip platform for early detection of disease biomarkers. Digital Life Norway Centre Digital Life 2019 , Clarion Hotel Edge, Tromsø 2019-09-05 - 2019-09-06
Academic lecture

Aksnes, Astrid; Høvik, Jens; Yadav, Mukesh; Noh, Jong Wook; Hjelme, Dag Roar; Milenko, Karolina Barbara. (2019) Photonics activities at IES: LOC biosensor project and Artificial intraperitoneal pancreas project. UiT Seminar at UiT , Tromsø 2019-09-05 - 2019-09-05

2018

Poster

Bösch, Patrick Christian; Fougner, Anders Lyngvi; Ellingsen, Reinold; Hjelme, Dag Roar; Stavdahl, Øyvind. (2018) Test-rig for Automated Testing of Continuous Glucose Sensor Prototypes. Kenes International Organizers of Congresses S.A. Advanced Technologies & Treatments for Diabetes (ATTD) , Vienna 2018-02-14 - 2018-02-17
Academic lecture

Hjelme, Dag Roar. (2018) SP2 - Sensor development. SINTEF Energi & EGE Oslo KPN WtE 2030 seminar, workshop & SC , Renovasjonsetaten, Oslo 2018-10-30 - 2018-10-31
Academic lecture

Hammarling, Krister; Muri, Harald Ian; Wahl, Markus Solberg; Engholm, Magnus; Hjelme, Dag Roar. (2018) A combined glucose and pH sensor on a single optical fiber for continuous point-of-care testing. Proceedings of SPIE, the International Society for Optical Engineering 2018 ;Volum 10488 2018-01-27 - 2018-02-01
Academic lecture

Jernelv, Ine Larsen; Milenko, Karolina Barbara; Ellingsen, Reinold; Hjelme, Dag Roar; Aksnes, Astrid. (2018) Developing a Mid-Infrared Spectroscopy System for Biomedical Sensing. Norwegian Electro-Optics Meeting , Henningsvær 2018-05-02 - 2018-05-04
Poster

Wahl, Markus Solberg; Wilhelmsen, Øivind; Hjelme, Dag Roar. (2018) Combined temperature and RI sensor for exploring the phase transitions of ethanol solutions. EPFL OFS26 , Lausanne 2018-09-24 - 2018-09-28
Academic lecture

Wahl, Markus Solberg; Wilhelmsen, Øivind; Hjelme, Dag Roar. (2018) A Combined Temperature Sensor and Phase Transition Detection Probe on a Single Optical Fiber. 20th Symposium on Thermophysical Properties , Boulder 2018-06-24 - 2018-06-29
Poster

Yadav, Mukesh; Høvik, Jens; Hjelme, Dag Roar; Aksnes, Astrid. (2018) Sensitivity enhanced biophotonic sensor utilizing sub-wavelength gratings. SPIE, The International Society for Optics and Photonics SPIE International Symposium on Optics + Photonics 2018 , San Diego, California, USA 2018-08-19 - 2018-08-23
Academic lecture

Osinski, Dominik; Hjelme, Dag Roar. (2018) A sensory substitution device inspired by the human visual system. 11th International Conference on Human System Interaction HSI 2018 2018-07-04 - 2018-07-06
Poster

Milenko, Karolina Barbara; Jernelv, Ine Larsen; Fuglerud, Silje Skeide; Aksnes, Astrid; Ellingsen, Reinold; Hjelme, Dag Roar. (2018) Glucose monitoring with optical fiber based Raman spectroscopy. Norwegian Electro-Optics Meeting 2018-05-02 - 2018-05-04
Poster

Larsen Jernelv, Ine; Milenko, Karolina Barbara; Ellingsen, Reinold; Hjelme, Dag Roar; Aksnes, Astrid. (2018) Improving Multivariate Analysis in Mid-Infrared Spectroscopy for Biosensing. Optical Society of America Advanced Photonics Congress , Zürich 2018-07-02 - 2018-07-05
Lecture

Burheim, Odne Stokke; Lien, Kristian Myklebust; Hjelme, Dag Roar. (2018) ENERSENSE - Energy Nexus of Efficiency, Storage, and Sensor. NTNU, Bruno Pollet, og Int. Soc. Hydrogen Energy H2FC2018 , Trondheim 2018-05-14 - 2018-05-15
Academic lecture

Fuglerud, Silje Skeide; Milenko, Karolina Barbara; Larsen Jernelv, Ine; Ellingsen, Reinold; Aksnes, Astrid; Hjelme, Dag Roar. (2018) A miniaturized ball-lensed fiber optic NIR transmission spectroscopy-based glucose sensor. The Optical Society OSA Advanced Photonics Congress , Zürich 2018-07-02 - 2018-07-05
Poster

Milenko, Karolina Barbara; Larsen Jernelv, Ine; Fuglerud, Silje Skeide; Aksnes, Astrid; Ellingsen, Reinold; Hjelme, Dag Roar. (2018) Towards Fiber-Optic Raman Spectroscopy for Glucose Sensing. OSA OSA Advanced Photonics Congress , Zurich 2018-07-02 - 2018-07-05

2017

Poster

Sarker, Shiplu; Lamb, Jacob Joseph; Lien, Kristian Myklebust; Hjelme, Dag Roar. (2017) Anaerobic digestion system for bio-CH4 and bio-H2 production utilizing fish waste in Norway: A comparison between a single stage and two stage reactor process. ETA Florence, Renewable Energies European biomass conference and exhibition 2017 , Stockholm 2017-06-12 - 2017-06-15
Poster

Hjelme, Dag Roar; Muri, Harald Ian DI. (2017) First step towards an interferometric and localized surface plasmon fiber optic sensor. IEEE, SPIE, OSA Optical Fiber Sensors Conference (OFS), 2017 25th 2017-04-24 - 2017-04-28
Poster

Hammarling, Krister; Muri, Harald Ian DI; Wahl, Markus Solberg; Engholm, Magnus; Hjelme, Dag Roar. (2017) Dual Parameter Fiber Optic Sensor Combining a Fabry-Perot and a Mach-Zehnder Interferometer. IEEE IEEE Sensors 2017 , Glasgow 2017-10-29 - 2017-11-01
Academic lecture

Hjelme, Dag Roar. (2017) A Lower Bound on the Resolution Limit of Resonant Refractive Index Sensors. Optical Society of America Advanced Photonics 2017 , New Orleans 2017-07-24 - 2017-07-27
Poster

Milenko, Karolina Barbara; Jernelv, Ine Larsen; Aksnes, Astrid; Ellingsen, Reinold; Carlsen, Sven Magnus; Hjelme, Dag Roar. (2017) Raman spectroscopy for continuous glucose monitoring. Centre for Digital Life Norway Digital Life 2017 , Oslo 2017-03-20 -
Lecture

Milenko, Karolina Barbara; Jernelv, Ine Larsen; Aksnes, Astrid; Ellingsen, Reinold; Carlsen, Sven Magnus; Hjelme, Dag Roar. (2017) Optical Fiber Probe based on Raman Spectroscopy for Continuous Glucose Monitoring. 9th International Conference on Advanced Vibrational Spectroscopy , Victoria BC 2017-06-11 - 2017-06-16
Poster

Larsen Jernelv, Ine; Milenko, Karolina Barbara; Carlsen, Sven Magnus; Ellingsen, Reinold; Hjelme, Dag Roar; Aksnes, Astrid. (2017) Quantitative Measurements of Glucose Solutions Using Mid-Infrared Spectroscopy. Digital Life Digital Life 2017 , Oslo 2017-03-20 - 2017-03-21
Poster

Larsen Jernelv, Ine; Milenko, Karolina Barbara; Hjelme, Dag Roar; Ellingsen, Reinold; Carlsen, Sven Magnus; Aksnes, Astrid. (2017) Optimising Multivariate Models for Glucose Measurements in an ATR-FTIR Spectrometer. ICAVS9 , Victoria 2017-06-11 - 2017-06-16
Poster

Lamb, Jacob Joseph; Sarker, Shiplu; Lien, Kristian Myklebust; Hjelme, Dag Roar. (2017) On-line monitoring of volatile fatty acids and hydrogen during anaerobic digestion. 3rd Conference on Monitoring & Process Control of Anaerobic Digestion Plants 2017-03-29 - 2017-03-30
Poster

Åm, Marte Kierulf; Fougner, Anders Lyngvi; Bösch, Patrick Christian; Dirnena-Fusini, Ilze; Kölle, Konstanze; Stavdahl, Øyvind. (2017) Intraperitoneal glucose measuring using amperometric glucose sensors and intraperitoneal fluid samples in an animal model. Kenes International Organizers of Congresses S.A. Advanced Technologies & Treatments for Diabetes (ATTD) , Paris 2017-02-15 - 2017-02-18
Poster

Bösch, Patrick Christian; Åm, Marte Kierulf; Stavdahl, Øyvind; Fougner, Anders Lyngvi; Carlsen, Sven Magnus; Ellingsen, Reinold. (2017) Set-up and procedure for intraperitoneal glucose monitoring in anaesthetised animals. Kenes International Organizers of Congresses S.A. Advanced Technologies & Treatments for Diabetes (ATTD) , Paris 2017-02-15 - 2017-02-18

2016

Academic lecture

Muri, Harald Ian; Hjelme, Dag Roar. (2016) Reflection based nanoplasmonic fiber optic sensor. Norwegian electro-optics meeting 2016 2016-04-13 - 2016-04-15

2015

Programme participation

Hjelme, Dag Roar; Trana, Kjartan. (2015) Forsker-praten, Optisk sensorteknologi. [Radio] 2015-04-20
Lecture

Hjelme, Dag Roar. (2015) Komponenter for optiske nettverk. NITO Fiberoptikk 2015 , Trondheim 2015-11-02 - 2015-11-03
Academic lecture

Hjelme, Dag Roar. (2015) Lab-on-a-chip biophotonic sensor platform for diagnostics. NTNU NTNU Bioinformatics Network Seminar 2015 , Trondheim 2015-12-14 - 2015-12-14
Academic lecture

Hjelme, Dag Roar; Strømstad, Håkon. (2015) Low-cost high performance readout system for fiber-optic biosensors. SPIE Photonic West BIOS , San Francisco 2015-02-07 - 2015-02-12

2014

Academic lecture

Hjelme, Dag Roar; Aune, Oddvar; Falch, Berit H.; Østling, Dan; Ellingsen, Reinold. (2014) Fiber-Optic Biosensor Technology for Rapid, Accurate and Specific Detection of Enzymes. Optical Society of America Advanced Photonics , Barcelona 2014-07-27 - 2014-07-31

2011

Poster

Kimsas, Andreas; Bjørnstad, Steinar; Stol, Norvald; Hjelme, Dag Roar. (2011) AWGshare - a Highly Scalable and Strictly Non-Blocking Optical Switch. Universitetet i Bologna 15th International Conference on Optical Network Design and Modeling (ONDM 2011) , Bologna 2011-02-07 - 2011-02-10

2010

Academic lecture

Hjelme, Dag Roar. (2010) An Optical Biosensor Technology For Clinical Diagnostics And Monitoring. Norsk Fysisk Selskap Norwegian Electro-Optics Meeting , Ålesund 2010-04-07 - 2010-04-09

2009

Academic lecture

Tierney, Sven; Hjelme, DR; Stokke, Bjørn Torger. (2009) Application of a high resolution interferometric fiber-optic technology platform for development of (bio)polymer hydrogels as signal transducers in biosensing. Norwegian Research Council 3rd NANOMAT Conference , Lillehammer 2009-06-14 - 2009-06-16

2008

Academic lecture

Tierney, Sven; Hjelme, DR; Stokke, Bjørn Torger. (2008) Glucose responsive hydrogels measured by a novel optical technique. Polymer Networks Group Polymer Networks 2008, 19th Polymer Networks Group Conference , Larnaca 2008-06-22 - 2008-06-26

2007

Academic lecture

Bjørnstad, Steinar; Nord, Martin; Eriksen, Lars Erik; Tuft, Vegard Larsen; Hjelme, Dag Roar; Stol, Norvald. (2007) Demonstration and analysis of TV- and data transport in the OpMiGua hybrid circuit/packet switched network testbed. DBB 33rd European Conference and Exhibition on Optical Communication Conference , Berlin 2007-09-17 - 2007-09-19
Academic lecture

Bjørnstad, Steinar; Nord, Martin; Eriksen, Lars Erik; Tuft, Vegard; Hjelme, Dag Roar; Stol, Norvald. (2007) Demonstration and analysis of TV- and data transport in the OpMiGua hybrid circuit/packet switched network testbed. Verein der Deutschen Ingenieuren ,” European Conference on Optical Communication (ECOC 2007), Session 4.6, September 16 - 20, 2007, , Berlin, Germany 2007-09-18 - 2007-09-20
Academic lecture

Tierney, Sven; Stokke, Bjørn Torger; Hjelme, Dag Roar. (2007) Polymer Gel Transducers as an Interface for Optical Detection of Biological Molecules. Materials Research Society MRS fall meeting 2007, symposium LL: Bioinspired Polymer Gels and Networks , Boston 2007-11-26 - 2007-11-29
Poster

Larsen, Eivind La Puebla; Randeberg, Lise Lyngsnes; Gederaas, Odrun Arna; Krokan, Hans Einar; Hjelme, Dag Roar; Svaasand, Lars O.. (2007) In vitro study on methemoglobin formation in erythrocytes following hexyl-aminolevulinate induced photodynamic therapy. SPIE SPIE Photonics West 2007: Biomedical Optics (BiOS) , San Jose 2007-01-20 - 2007-01-25

2006

Academic lecture

Tuft, Vegard Larsen; Hjelme, Dag Roar. (2006) The Effect of PDL in a Polarization and Time Division Multiplexed Scheme for All-Optical Class of Service Segregation. IEEE 8th International Conference on Transparent Optical Networks (ICTON 2006) , Nottingham 2006-06-19 - 2006-06-22
Academic lecture

Larsen, Eivind La Puebla; Randeberg, Lise Lyngsnes; Gederaas, Odrun Arna; Arum, Carl-Jørgen; Krokan, Hans Einar; Hjelme, Dag Roar. (2006) Monitoring of hALA induced PDT in rat bladder cancer by optical spectroscopy. American Society for Laser Medicine and Surgery Twenty-Sixth Annual Meeting , Boston, Massachusetts 2006-04-05 - 2006-04-09
Academic lecture

Bjørnstad, Steinar; Eriksen, Lars Erik; Hjelme, Dag Roar. (2006) The OpMiGua multiservice optical hybrid packet/circuit switched network supporting TV-broadcasting QoS requirements. ICTON 2006 , Nottingham 2006-06-18 - 2006-06-22
Poster

Tuft, Vegard Larsen; Bjørnstad, Steinar; Sudbø, Aasmund; Hjelme, Dag Roar. (2006) Using the State of Polarization in a Hybrid Optical Network. Norwegian Physical Society Northern Optics 2006 , Bergen 2006-06-14 - 2006-06-16
Poster

Tuft, Vegard Larsen; Buron, Jakob; Hjelme, Dag Roar; Bjørnstad, Steinar. (2006) Demonstration of an All-Optical Class-of-Service Segregation Method for Edge Nodes in Hybrid Circuit/Packet Switched Networks. The SEE 32nd European Conference on Optical Communication (ECOC) 2006 , Cannes 2006-09-24 - 2006-09-28
Poster

Bjørnstad, Steinar; Nord, Martin; Tuft, Vegard Larsen; Austad, Oddgeir; Hjelme, Dag Roar; Eriksen, Lars Erik. (2006) Experimental Demonstration of OpMiGua Hybrid Circuit/Packet Nodes. The SEE 32nd European Conference on Optical Communication (ECOC) 2006 , Cannes 2006-09-24 - 2006-09-28
Poster

Tuft, Vegard; Bjørnstad, Steinar; Sudbø, Aasmund Sveinung; Hjelme, Dag Roar. (2006) Using the state of polarization in a hybrid optical network, paper W46 at the conference ‘,’ 14-16 June 2006,. Norsk Fysisk Selskap Northern Optics 2006 , Radisson SAS Hotel Norge, Bergen 2006-06-14 - 2006-06-16
Poster

Larsen, Eivind La Puebla; Randeberg, Lise Lyngsnes; Hjelme, Dag Roar; Svaasand, Lars O.. (2006) Fiber probe for in vivo Optical Spectroscopy during Photodynamic Therapy. Norwegian Physical Society (NFS) Northern Optics , Bergen 2006-06-14 - 2006-06-16
Poster

Tierney, Sven; Stokke, Bjørn Torger; Hjelme, Dag Roar; Sundan, Anders. (2006) Polymer gel transducers as an interface for optical detection of biological macromolecules. Biofysikkseksjonen av Norsk fysisk selskap Biofysikermøtet 2006 , Kongsvold Fjeldstue 2006-03-15 - 2006-03-17

2005

Academic lecture

Tuft, Vegard Larsen; Bjørnstad, Steinar; Hjelme, Dag Roar. (2005) Time Interleaved Polarization Multiplexing for Polarization Labelling. Universitat Politècnica de Catalunya 7th International Conference on Transparent Optical Networks , Barcelona 2005-07-03 - 2005-07-07

2004

Academic lecture

Bjørnstad, Steinar; Hjelme, Dag Roar; Stol, Norvald. (2004) Asynchronous feedback buffer with reduced self induced contention for optical packet switches. Optoelectronics and communication conference/International conference on optical Internet , Yokohama 2004-07-12 - 2004-07-16
Academic lecture

Bjørnstad, Steinar; Hjelme, Dag Roar; Stol, Norvald; Nord, Martin. (2004) A packet switched hybrid optical network with service guarantees. Norsk elektro-optikk møte , Tønsberg 2004-05-02 - 2004-05-04
Academic lecture

Vignes, Bendik; Chizhov, Mikhail; Makarov, Vadim; Dyrseth, Astrid Aksnes; Hjelme, Dag Roar. (2004) Faked sates attack on quantum cryptosystems. Norwegian Electro-Optical Society Norwegian Electro-Optics Meeting 2004 , Tønsberg 2004-05-02 - 2004-05-04
Poster

Dyrseth, Astrid Aksnes; Engan, Helge Emil; Hjelme, Dag Roar. (2004) Optical detection of ultrasound and optical spectroscopy for detection of vulnerable plaques. Optics Group of Norwegian Physical Society Norwegian Electro-Optics meeting , Tønsberg 2004-05-02 - 2004-05-04

2003

Academic lecture

Bjørnstad, Steinar; Nord, Martin; Hjelme, Dag Roar. (2003) QoS differentiation and header/payload separation in optical packet switching using polarisation multiplexing. European Conference on Optical Communication , Rimini 2003-09-21 - 2003-09-25
Academic lecture

Bjørnstad, Steinar; Hjelme, Dag Roar; Stol, Norvald. (2003) A highly efficient optical packet switching node design supporting guaranteed service. European Conference on Optical Communication , Rimini 2003-09-21 - 2003-09-25

2002

Poster

Makarov, Vadim; Hjelme, Dag Roar. (2002) Practical quantum cryptography. Norwegian Electro-Optics Meeting 2002 , Flåm 2002-05-05 -
Academic lecture

Makarov, Vadim; Hjelme, Dag Roar. (2002) Quantum cryptography. Norsk kryptoseminar 2002 , Trondheim 2002-10-18 -
Academic lecture

Bjørnstad, Steinar; Nord, Martin; Hjelme, Dag Roar. (2002) Transparent optical protection switching scheme based on detection of polarisation fluctuations. OFC2002 Optical Fiber Communication conference , Anaheim, California, USA 2002-03-21 -
Academic lecture

Bjørnstad, Steinar; Hjelme, Dag Roar; Stol, Norvald. (2002) A scalable optical packet switch for variable length packets employing share electronic buffering. ECOC2002 European Conference on Optical Communications , Copenhagen, Denmark 2002-09-11 -
Academic lecture

Bjørnstad, Steinar; Stol, Norvald; Hjelme, Dag Roar. (2002) Quality of service in optical packet switched DWDM transport networks. Asia Pacific Optical and Wireless Communications conference and exibition 2002 (APOC 2002, SPIE Conference) , Shanghai, China 2002-10-16 -
Academic lecture

Bjørnstad, Steinar; Hjelme, Dag Roar; Stol, Norvald. (2002) An optical packet switch design with shared electronic buffering and low bit rate add/drop inputs. ICTCON'2002 , Warsawa, Poland 2002-04-22 -

2001

Poster

Makarov, Vadim; Hjelme, Dag Roar. (2001) High-Speed Quantum Key Distribution Experiment. QUICK: Quantum interference and cryptographic keys: novel physics and advancing technologies , Cargese, Corsica, France 2001-04-13 -
Academic lecture

Bjørnstad, Steinar; Nord, Martin; Hanssen, Geir; Slagsvold, Bjørn; Hjelme, Dag Roar. (2001) Impact of Four-Wave-Mixing in polarization multiplexed 12.5 GHz channel spacing WDM systems. LEOS 2001 , San Diego, California, USA 2001-11-15 -

1998

Academic lecture

Hjelme, Dag Roar; Storøy, Helge; Skaar, Johannes. (1998) Reconfigurable all-fiber cross-connect node using synthesized fiber Bragg gratings for both demultiplexing and switching. Optical Fiber Communication Conference OFC'98 , San Jose, California

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Dag Roar Hjelme

Dag Roar Hjelme

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