Pulse response of the short-wave infrared detection system of the ocean color instrument for the NASA PACE Mission

U. Gliese; Z. Rhodes; K. Squire; K. S. Jepsen; B. Cairns; B. L. Clemons; J. Cook; R. Esplin; R. H. Estep Jr.; E. T. Gorman; E. Kan; W. Lu; G. Meister; D. B. Mott; F. S. Patt; J. Peterson; R. G. Schnurr

doi:10.1117/12.2684367

19 October 2023 Pulse response of the short-wave infrared detection system of the ocean color instrument for the NASA PACE Mission

U. Gliese, Z. Rhodes, K. Squire, K. S. Jepsen, B. Cairns, B. L. Clemons, J. Cook, R. Esplin, R. H. Estep Jr., E. T. Gorman, E. Kan, W. Lu, G. Meister, D. B. Mott, F. S. Patt, J. Peterson, R. G. Schnurr

Author Affiliations +

Proceedings Volume 12729, Sensors, Systems, and Next-Generation Satellites XXVII; 127290O (2023) https://doi.org/10.1117/12.2684367
Event: SPIE Remote Sensing, 2023, Amsterdam, Netherlands

Abstract

The Ocean Color Instrument (OCI) on NASA’s Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) mission is a hyperspectral Earth imager with a spatial resolution of 1 km x 1 km and a spectral resolution of 5 nm in 2.5 nm steps over 342 nm to 887 nm. In addition, OCI provides seven discrete bands in the 940 nm to 2260 nm Short-Wave InfraRed (SWIR) range. The front-end optical imager is a rotating mirror-based system that images the ground scene onto a slit with an instantaneous field of view of 16 km x 1 km. For the SWIR bands, the slit-image is re-imaged onto a 16x1 micro-lens array that effectively acts as the focal plane since each lens element is fiber coupled to wavelength filtered InGaAs and HgCdTe Photo Diodes (PDs). The pulse response of the detection system is critical to OCI SWIR performance. We find that PDs introduce an inherent slow tail in the pulse response due to slow diffusion moving carriers in their n and p regions. We show that this introduces response errors ranging from 1 down to 0.01 % for up to tens of science pixels after the pulse depending on the PD design and materials. It is shown that the response is distinctly different for the InGaAs and HgCdTe PDs. We explain how the front-end design can further increase this error. Finally, we detail the cause of the slow pulse response tail, how to model it, its impact on OCI performance and how it is characterized and corrected to meet OCI requirements.

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(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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U. Gliese, Z. Rhodes, K. Squire, K. S. Jepsen, B. Cairns, B. L. Clemons, J. Cook, R. Esplin, R. H. Estep Jr., E. T. Gorman, E. Kan, W. Lu, G. Meister, D. B. Mott, F. S. Patt, J. Peterson, and R. G. Schnurr "Pulse response of the short-wave infrared detection system of the ocean color instrument for the NASA PACE Mission", Proc. SPIE 12729, Sensors, Systems, and Next-Generation Satellites XXVII, 127290O (19 October 2023); https://doi.org/10.1117/12.2684367

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