dc.contributor.author | Schwermer, Silje Fuglerud | |
dc.contributor.author | Noh, Jong Wook | |
dc.contributor.author | Aksnes, Astrid | |
dc.contributor.author | Hjelme, Dag Roar | |
dc.date.accessioned | 2023-03-23T07:16:21Z | |
dc.date.available | 2023-03-23T07:16:21Z | |
dc.date.created | 2022-04-26T10:10:29Z | |
dc.date.issued | 2022 | |
dc.identifier.citation | Applied Optics. 2022, 61 (9), 2371-2381. | en_US |
dc.identifier.issn | 1559-128X | |
dc.identifier.uri | https://hdl.handle.net/11250/3059983 | |
dc.description.abstract | 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 a supercontinuum source in the long-pulse regime (2 ns) and a balanced detector scheme to demonstrate high-accuracy NIRS-based sensing. The noise sources of the system are studied theoretically and experimentally. The relative intensity noise was reduced from typical values up to 6% to less than 0.1% by deploying a balanced detector and averaging. At well-balanced wavelengths, the system without transmission cells achieved a signal to noise ratio (SNR) above 70 dB, approaching the shot noise limit. With transmission cells and long-term measurements, the overall SNR was 55 dB. Glucose in physiological concentrations was measured as a model system, yielding a root mean square error of 4.8 mM, approaching the needed accuracy for physiological glucose monitoring. | en_US |
dc.language.iso | eng | en_US |
dc.publisher | Optica | en_US |
dc.title | Performance improvement in a supercontinuum fiber-coupled system for near infrared absorption spectroscopy | en_US |
dc.title.alternative | Performance improvement in a supercontinuum fiber-coupled system for near infrared absorption spectroscopy | en_US |
dc.type | Peer reviewed | en_US |
dc.type | Journal article | en_US |
dc.description.version | acceptedVersion | en_US |
dc.source.pagenumber | 2371-2381 | en_US |
dc.source.volume | 61 | en_US |
dc.source.journal | Applied Optics | en_US |
dc.source.issue | 9 | en_US |
dc.identifier.doi | 10.1364/AO.449908 | |
dc.identifier.cristin | 2019116 | |
dc.relation.project | Norges forskningsråd: 248872 | en_US |
cristin.ispublished | true | |
cristin.fulltext | postprint | |
cristin.qualitycode | 1 | |