Integrated fiber optic spectrally resolved downwelling irradiance sensor for pushbroom spectrometers

Graham, Christopher; Girkin, John M.; Bourgenot, Cyril

doi:10.1364/oe.477699

Integrated fiber optic spectrally resolved downwelling irradiance sensor for pushbroom spectrometers

Graham, Christopher; Girkin, John M.; Bourgenot, Cyril

Authors

Christopher Graham christopher.j.graham@durham.ac.uk
Postdoctoral Research Associate

Professor John Girkin j.m.girkin@durham.ac.uk
Professor

Cyril Bourgenot cyril.bourgenot@durham.ac.uk
Associate Professor

Abstract

We present an integrated fiber optic spectrally resolved downwelling irradiance sensor for pushbroom hyperspectral imagers. The system comprises of a cosine corrector and custom fiber patch cables, collecting the ambient light in a large solid angle and feeding it directly to the entrance slit of the spectrometer. The system enables simultaneous measurement of downwelling and upwelling irradiance using the main hyperspectral camera sensor. As a demonstration, the spectral reflectance of a soil sample was measured with a RMSE of 8.4%, a significant improvement on the RMSE of 54% found without correction. At a weight of approximately 10 grams, this system provides a substantial weight saving over standalone incident light sensing instruments.

Citation

Graham, C., Girkin, J. M., & Bourgenot, C. (2022). Integrated fiber optic spectrally resolved downwelling irradiance sensor for pushbroom spectrometers. Optics Express, 30(25), 45592-45598. https://doi.org/10.1364/oe.477699

Journal Article Type	Article
Acceptance Date	Nov 16, 2022
Online Publication Date	Nov 30, 2022
Publication Date	2022
Deposit Date	Jan 9, 2023
Publicly Available Date	Jan 9, 2023
Journal	Optics Express
Electronic ISSN	1094-4087
Publisher	Optica
Peer Reviewed	Peer Reviewed
Volume	30
Issue	25
Pages	45592-45598
DOI	https://doi.org/10.1364/oe.477699

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