Blar i NTNU Open på forfatter "Hjelme, Dag Roar"
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Moisture detection in waste materials by using electromagnetic waves in the GHz domain
Jordal, Konstantin (Master thesis, 2021)Denne masteroppgaven tar for seg om elektromagnetiske bølger i GHz-domenet kan brukes til å detektere fuktighetsnivået i avfall ved Waste-to-Energy anlegg. Dette kan oppnås i et oppsett der avfallsmaterialer blir belyst ... -
Near Infrared Spectroscopy for Continuous Glucose Monitoring
Schwermer, Silje Fuglerud (Doctoral theses at NTNU;2022:184, Doctoral thesis, 2022)Millions of people are affected by diabetes. The disease can be managed by measuring the blood glucose levels and administering appropriate insulin doses. However, diabetes management is difficult and time consuming for ... -
New Development in Fiber Technologies
Thai, Luan Thanh (Master thesis, 2013)Optical fiber technologies has gone through tremendous developmentssince its first installation in the 1970s. Three decadeslater it has become the backbone of the global telecommunicationsnetwork, providing high speed ... -
Novel Fiber Optic Biosensors Based on Nanoplasmonic and Interferometric Modalities
Muri, Harald Ian Damm Irgens (Doctoral theses at NTNU;2018:392, Doctoral thesis, 2018)New and improved monitoring of complex multivariable environments often relies on the diversity and implementation of new sensor technologies. Before and after the worldwide recession, the sensor market showed to have a ... -
Novel localized surface plasmon resonance based optical fiber sensor
Muri, Ian; Hjelme, Dag Roar (Journal article; Peer reviewed, 2016)Over the last decade various optical fiber sensing schemes have been proposed based on local surface plasmon resonance (LSPR). LSPR are interacting with the evanescent field from light propagating in the fiber core or by ... -
On-chip mid-infrared optical sensing with GeSbSe waveguides and resonators
Grayson, Michael; Krueper, Greg; Xu, Bo; Zohrabi, Mo; Hjelme, Dag Roar; Gopinath, Juliet; Park, Wounjhang (Journal article; Peer reviewed, 2023)We fabricated single mode Ge28Sb12Se60 waveguides and resonators using e-beam lithography and achieved a propagation loss of 3.88 dB/cm at 3.66 µm. We compared BCl3 and CHF3 etch chemistries and determined CHF3 produced ... -
On-chip refractive index sensors for lab-on-a-chip applications
Yadav, Mukesh (Doctoral theses at NTNU;2023:436, Doctoral thesis, 2023)Optical waveguide-based refractive index sensing is an emerging technology for the sensitive monitoring of molecular interactions. This technology could fulfill the requirements for “on-chip” detection in lab-on-a-chip ... -
Optical properties of palladium gold alloy thin films and modeling of their use in hydrogen sensors
Nordgård-Hansen, Torstein (Master thesis, 2022)Denne masteroppgaven omhandler bruk av metalltynnfilmer i optiske overflateplasmonbaserte hydrogensensorer. Metallisk palladium er unikt i at det både kan absorbere og frigjøre hydrogen fra og til atmosfæren under normale ... -
Optical Sensor System for Deflection and Vibration Detection in Internal Turning Tools
Leksås, Vegard Leer (Master thesis, 2021)Ved innvendig dreiing er det viktig å redusere vibrasjoner og verktøyutbøying for å forbedre resultatet av maskineringen. I dette prosjektet har det blitt utviklet et optisk sensorsystem for å måle disse parameterne. ... -
Optimization of electronic Gigabit Ethernet Interfaces in the OpMiGua hybrid Circuit/Packet Network Demonstrator
Austad, Oddgeir (Master thesis, 2006)This thesis was written at NTNU during the spring of 2006. The main goals of the thesis were to contribute in the further expansion of the OpMiGua demonstrator, with emphasis on the electronic aspects. OpMiGua is a ... -
Optimization of SERS Sensing With Micro-Lensed Optical Fibers and Au Nano-Film
Milenko, Karolina Barbara; Fuglerud, Silje Skeide; Aksnes, Astrid; Ellingsen, Reinold; Hjelme, Dag Roar (Peer reviewed; Journal article, 2020)We present the fabrication and characterization of optical fiber reflection probes based on surface-enhanced Raman scattering (SERS) and micro-lensed multimode fibers. For the SERS substrate, a nano-sphere lithography ... -
Optimization of Signal Quality in Low Power Medical Reflectance Pulse Oximetry
Veisdal, Julian (Master thesis, 2019)Nyvinninger innen elektronikk og embedded signal behandling har banet vei for utviklingen av små, energieffektive, bærbare sensorer som har høy nok målenøyaktighet til å kunne bli anvendt til klinisk bruk på sykehus. ... -
Overview of recent progress towards in-situ biogas upgradation techniques
Sarker, Shiplu; Lamb, Jacob Joseph; Hjelme, Dag Roar; Lien, Kristian Myklebust (Journal article; Peer reviewed, 2018)Biogas, as derived from the anaerobic digestion process, offers a versatile possibility of renewable and sustainable energy usage. When enriched, upgraded biogas can yield high levels of biomethane, allowing its use as an ... -
Performance improvement in a supercontinuum fiber-coupled system for near infrared absorption spectroscopy
Schwermer, Silje Fuglerud; Noh, Jong Wook; Aksnes, Astrid; Hjelme, Dag Roar (Peer reviewed; Journal article, 2022)Accurate, in-field-compatible, sensing based on near infrared spectroscopy (NIRS) requires development of instrumentation with low noise and long-term stability. Here, we present a fully fiber-optic spectroscopy setup using ... -
Perspectives of optical colourimetric sensors for anaerobic digestion
Lamb, Jacob Joseph; Bernard, Olivier; Sarker, Shiplu; Lien, Kristian Myklebust; Hjelme, Dag Roar (Journal article; Peer reviewed, 2019)Although biogas is not a new approach to producing renewable fuel, it could further be developed to improve its potential as an alternative energy source. To achieve this, vast improvements in the efficiency and cost of ... -
Perspectives of surface plasmon resonance sensors for optimized biogas methanation
Lamb, Jacob Joseph; Bernard, Olivier; Sarker, Shiplu; Lien, Kristian Myklebust; Hjelme, Dag Roar (Journal article; Peer reviewed, 2019)Biogas production is becoming significantly viable as an energy source for replacing fossil‐based fuels. The further development of the biogas production process could lead to significant improvements in its potential. ... -
Polarization Dependent Loss (PDL) in Polarization Multiplexed and Hybrid Optical Networks
Chapa Gordero, Felisa (Master thesis, 2007)Study of the Polarization Dependent Loss caused by the combined effect of orthogonality degradation and dynamic power fluctuations in a hybrid network, which combines circuit switching with packet switching to transmit ... -
Polarization Effects in Wavelength Converters based on Semiconductor Optical Amplifiers
Martin Martin, Raul (Master thesis, 2007)Polarization Effects in Wavelength Converters based on Semiconductor Optical Amplifiers -
Polarization Sensing In an Urban Environment - Exploring The Sensing Potential of Telecom infrastructure
Gjesdal, Jostein (Master thesis, 2023)Optiske fibernettverk har blitt hovedtransportmiddelet for informasjon i den moderne verden. Etterhvert som det globale fibernettverket vokser, åpner det seg muligheter for nye komplementære anvendelser i tillegg til de ... -
Polarization-driven reversible actuation in a photo-responsive polymer composite
Urban, David; Marcucci, Niccolò; Wölfle, Christoph Hubertus; Torgersen, Jan; Hjelme, Dag Roar; Descrovi, Emiliano (Peer reviewed; Journal article, 2023)Light-responsive polymers and especially amorphous azopolymers with intrinsic anisotropic and polarization-dependent deformation photo-response hold great promises for remotely controlled, tunable devices. However, dynamic ...