Infrared spectral responses of the Ocean Color Instrument (OCI) pre-assembly and integration

Jacob K. Hedelius; Kenneth J. Squire; James Q. Peterson; Branimir Blagojević; Ulrik B Gliese; Eric T. Gorman; David K. Moser; Zakk Rhodes; Pedro Sevilla; Gerhard Meister

doi:10.1117/12.2631201

30 September 2022 Infrared spectral responses of the Ocean Color Instrument (OCI) pre-assembly and integration

Jacob K. Hedelius, Kenneth J. Squire, James Q. Peterson, Branimir Blagojević, Ulrik B Gliese, Eric T. Gorman, David K. Moser, Zakk Rhodes, Pedro Sevilla, Gerhard Meister

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Proceedings Volume 12232, Earth Observing Systems XXVII; 1223210 (2022) https://doi.org/10.1117/12.2631201
Event: SPIE Optical Engineering + Applications, 2022, San Diego, California, United States

Abstract

Spectral characterizations were made of the Ocean Color Instrument (OCI) short-wave infrared (SWIR) Detection Subassembly (SDS) responses (940–2260 nm) prior to their integration. Using modulated output light from a Fourier transform spectrometer, the in-band relative spectral responses of the nine different configurations of SDSs were found along with out-of-band (OOB) sensitivity. From these spectral responses, the center wavelengths (λ₀), full widths at half of the maximum, full widths at 1% of the maximum, and OOB rejection ratios were determined. All spectral parameters are within requirements. There are 2–8 repeats of each configuration, and the 1 σ spread among repeats is largest for the 1250 nm and 1615 nm high-gain configurations and is greater than 1 nm. The engineering requirement is for these values to be within ±4 nm and ±10 nm, respectively, of the nominal λ₀. There is also a λ₀ temperature dependence, which is expected. This temperature dependence is nearly a linear function of wavelength with a 9.5 × 10⁻³ nm K⁻¹ relationship on average.

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Jacob K. Hedelius, Kenneth J. Squire, James Q. Peterson, Branimir Blagojević, Ulrik B Gliese, Eric T. Gorman, David K. Moser, Zakk Rhodes, Pedro Sevilla, and Gerhard Meister "Infrared spectral responses of the Ocean Color Instrument (OCI) pre-assembly and integration", Proc. SPIE 12232, Earth Observing Systems XXVII, 1223210 (30 September 2022); https://doi.org/10.1117/12.2631201

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