Hyperspectral imaging under low illumination with a single photon camera

Griffiths, Alexander D. and Chen, Haochang and Herrnsdorf, Johannes and Li, David and Henderson, Robert K. and Strain, Michael J. and Dawson, Martin D.; (2019) Hyperspectral imaging under low illumination with a single photon camera. In: 2018 British and Irish Conference on Optics and Photonics, BICOP 2018 - Proceedings. IEEE, GBR. ISBN 9781538673614 (https://doi.org/10.1109/BICOP.2018.8658323)

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Conventional sensors for hyperspectral imaging are limited by noise when operated in low illumination conditions. Recent advances in single-photon avalanche diode (SPAD) arrays provide image sensors capable of single photon counting imaging. Such devices provides camera systems which can operate under low illumination levels and high frame rates, with fully digital in-pixel processing capabilities. Here, we present a hyperspectral imaging system based on low level illumination of a target scene using nine LEDs, each with different emission wavelengths. The backscattered light is captured by a SPAD camera, which can recover spectral information based on the number of photon counts received for each illumination wavelength.