Paper
7 October 2020 Calibration of instrument line shape of wide-swath greenhouse gas monitor instrument
Shizhao Li, Long Cheng, Hongchun Yang, Lei Ding
Author Affiliations +
Proceedings Volume 11571, Optics Frontier Online 2020: Optics Imaging and Display; 1157112 (2020) https://doi.org/10.1117/12.2580519
Event: Optics Frontiers Online 2020: Optics Imaging and Display (OFO-1), 2020, Shanghai, China
Abstract
The wide-swath greenhouse gas monitor is a hyperspectral resolution push-broom imaging spectrometer, which is used to detect global distribution of concentration of CO2 and CH4 in atmospheric greenhouse gases . Instrument Line Shape (ILS) is one of key parameters. Both radiometric calibration and spectral calibration need to convolve the reference spectrum with ILS. Therefore, the calibration accuracy of ILS directly affects radiometric accuracy and spectral accuracy. In order to accurately calibrate ILS, a test device with a tunable laser and integrating sphere was built; nine areas of the focal plane array detector were selected for the ILS calibration test, and the test results were Gaussian fitted. The results show that: taking the 1.61μm channel as an example, the accuracy of ILS is better than 1%; the spectral resolution, which is the full width at half maxima of ILS, is 0.07nm, which meets the need of retrieve applications.
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Shizhao Li, Long Cheng, Hongchun Yang, and Lei Ding "Calibration of instrument line shape of wide-swath greenhouse gas monitor instrument", Proc. SPIE 11571, Optics Frontier Online 2020: Optics Imaging and Display, 1157112 (7 October 2020); https://doi.org/10.1117/12.2580519
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KEYWORDS
Calibration

Spectral calibration

Spectral resolution

Tunable lasers

Integrating spheres

Light sources

Absorption

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