2022

• 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. volum 61 (9).
  Academic article

2021

• 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
• Yadav, Mukesh; Noh, Jong Wook; Hjelme, Dag Roar; Aksnes, Astrid. (2021) Spectral shaping of ring resonator transmission response. Optics Express. volum 29 (3).
  Academic article

2020

• Fuglerud, Silje Skeide; Milenko, Karolina Barbara; Aksnes, Astrid; Hjelme, Dag Roar. (2020) Surface-Enhanced Absorption Spectroscopy for Optical Fiber Sensing. Materials. volum 13 (34).
  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. volum 11 (7).
  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; 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; 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. volum 11233.
  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. volum 522.
  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. volum 119.
  Academic article

2019

• 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. volum 11073.
  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. volum 58 (10).
  Academic article
• 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. volum 19 (23).
  Academic article
• 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. volum 111.
  Academic literature review
• 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. volum 19 (11).
  Academic literature review
• 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. volum 9 (4).
  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. volum 58.
  Academic article
• Lamb, Jacob Joseph; Lien, Kristian Myklebust; Hjelme, Dag Roar. (2019) Digitalization of colourimetric sensor arrays for volatile fatty acid detection in anaerobic digestion. MethodsX. volum 6.
  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. volum 9:1915 (9).
  Academic literature review
• Wahl, Markus Solberg; Wilhelmsen, Øivind; Hjelme, Dag Roar. (2019) Addressing Challenges in Fabricating Reflection-Based Fiber Optic Interferometers. Sensors. volum 19 (18).
  Academic article
• Åm, Marte Kierulf; Fougner, Anders Lyngvi; Ellingsen, Reinold; Hjelme, Dag Roar; Bösch, Patrick Christian; Stavdahl, Øyvind; Carlsen, Sven Magnus; Christiansen, Sverre. (2019) Erratum to “Why intraperitoneal glucose sensing is sometimes surprisingly rapid and sometimes slow: A hypothesis” [Med. Hypotheses 132 (2019) 109318]. Medical Hypotheses. volum 134.
  Errata
• Åm, Marte Kierulf; Fougner, Anders Lyngvi; Ellingsen, Reinold; Hjelme, Dag Roar; Bösch, Patrick Christian; Stavdahl, Øyvind; Carlsen, Sven Magnus; Christiansen, Sverre. (2019) Why intraperitoneal glucose sensing is sometimes surprisingly rapid and sometimes slow: A hypothesis. Medical Hypotheses. volum 132:109318.
  Academic article

2018

• 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.). volum 54 (7).
  Academic literature review
• Lamb, Jacob Joseph; Sarker, Shiplu; Hjelme, Dag Roar; Lien, Kristian Myklebust. (2018) Fermentative Bioethanol Production Using Enzymatically Hydrolysed Saccharina latissima. Advances in microbiology. volum 8.
  Academic article
• 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. volum 43 (24).
  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. volum 36 (4).
  Academic article
• Muri, Harald Ian; Bano, Andon; Hjelme, Dag Roar. (2018) LSPR and Interferometric Sensor Modalities Combined Using a Double-Clad Optical Fiber. Sensors. volum 18 (1).
  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. volum 8 (12).
  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. volum 226.
  Academic literature review
• Åm, Marte Kierulf; Kölle, Konstanze; Fougner, Anders Lyngvi; Dirnena-Fusini, Ilze; Bösch, Patrick Christian; Ellingsen, Reinold; Hjelme, Dag Roar; Stavdahl, Øyvind; Carlsen, Sven Magnus; Christiansen, Sverre. (2018) Effect of sensor location on continuous intraperitoneal glucose sensing in an animal model. PLOS ONE. volum 13:e0205447 (10).
  Academic article

2017

• 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) First step towards an interferometric and localized surface plasmon fiber optic sensor. Proceedings of SPIE, the International Society for Optical Engineering. volum 10323.
  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. volum 10058.
  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. volum 17(12) (2723).
  Academic article

2016

• 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. volum 9754:97540E.
  Academic article
• Fougner, Anders Lyngvi; Kölle, Konstanze; Skjaervold, Nils Kristian; Elvemo, Nicolas-Andreas L.; Hjelme, Dag Roar; Ellingsen, Reinold; Carlsen, Sven Magnus; Stavdahl, Øyvind. (2016) Intraperitoneal Glucose Sensing is Sometimes Surprisingly Rapid. MIC Journal: Modeling, Identification and Control. volum 37 (2).
  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. volum 9702.
  Academic article

2015

• Strømstad, Håkon Grøn; Hjelme, Dag Roar. (2015) Low-cost high performance readout system for fiber-optic biosensors. Progress in Biomedical Optics and Imaging. volum 9332.
  Academic article

2014

• 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. volum 2 (1).
  Academic article

2013

• 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. volum 49 (2).
  Academic article

2011

• Hjelme, Dag Roar; Lydersen, Lars Vincent Van de Wiel; Makarov, Vadim. (2011) Quantum Cryptography. A Multidisciplinary Introduction to Information Security.
  Academic chapter/article/Conference paper
• Skjærvold, Nils Kristian; Solligård, Erik; Hjelme, Dag Roar; Aadahl, Petter. (2011) Continuous Measurement of Blood Glucose Validation of a New Intravascular Sensor. Anesthesiology. volum 114 (1).
  Academic article

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. volum 28 (1).
  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. volum 81 (9).
  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. volum 8 (5).
  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. volum 80.
  Academic article

2007

• 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. volum 19 (19).
  Academic article

2006

• Bjørnstad, Steinar; Hjelme, Dag Roar; Stol, Norvald. (2006) A Packet-Switched Hybrid Optical Network with Service Guarantees. IEEE Journal on Selected Areas in Communications. volum 24 (8).
  Academic article
• Larsen, Eivind La Puebla; Randeberg, Lise Lyngsnes; Gederaas, Odrun Arna; Arum, Carl-Jørgen; Krokan, Hans Einar; Chen, Duan; Hjelme, Dag Roar; Svaasand, Lars O.. (2006) Monitoring of hALA induced PDT in rat bladder cancer by optical spectroscopy. Lasers in Surgery and Medicine.
  Abstract
• Nord, Martin; Bjornstad, Steinar; Bjørnstad, Steinar; Austad, Oddgeir; Tuft, Vegard Larsen; Hjelme, Dag Roar; Sudbø, Aasmund; Eriksen, Lars Erik. (2006) OpMiGua Hybrid Circuit- and Packet-Switched Test-Bed Demonstration and Performance. IEEE Photonics Technology Letters. volum 18 (24).
  Academic article
• Nord, Martin; Bjørnstad, Steinar; Austad, Oddgeir; Tuft, Vegard; Hjelme, Dag roar; Sudbø, Aasmund Sveinung; Eriksen, Lars Erik. (2006) Hybrid circuit- and packet switched test-bed. IEEE Photonics Technology Letters. volum 18 (24).
  Academic article

2005

• Bjørnstad, Steinar; Nord, Martin; Olsen, Torodd; Hjelme, Dag Roar; Stol, Norvald. (2005) Burst, packet and hybrid switching in the optical core network. Telektronikk. volum 101 (2).
  Academic article
• Makarov, Vadim; Hjelme, Dag Roar. (2005) Faked states attack on quantum cryptosystems. Journal of Modern Optics. volum 52.
  Academic article

2004

• Makarov, Vadim; Brylevski, Alexey; Hjelme, Dag Roar. (2004) Real-time phase tracking in single-photon interferometers. Applied Optics. volum 43.
  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. volum 48 (13).
  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. volum 20.
  Academic article