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Proceedings Paper

The polarisation correction for space-borne grating spectrometers
Author(s): Fa-cai Zhao; Quan-she Sun; Kun-feng Chen; Xing-bang Zhu; Shao-shui Wang; Guo-quan Wang; Xiang-liang Zheng; Zhong Han
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Paper Abstract

Satellite measurements of backscattered sunlight contain essential information about the global distribution of atmospheric constituents. Light reflected from the Earth’s atmosphere is linearly or partially linearly polarized because of scattering of unpolarized sunlight by air molecules and aerosols. In the ultraviolet and visible part of the spectrum, measurements of space-borne grating spectrometers are in general sensitive to the state of polarization of the observed light. The interaction of polarized light with polarization-sensitive optical devices yields a different radiance that is measured by the detectors than the radiance that enters the instrument. In the OMI and the SBUV/2 instruments the problem of instrument polarization sensitivity is avoided because the polarized backscattered sunlight is depolarized before it interacts with the polarization-sensitive optical components. For GOME, SCIAMACHY, and GOME-2 it is intended to eliminate the polarization response of the instrument from the polarization-sensitive measurement. This paper discusses the basic concept of the polarisation correction of the space-borne grating spectrometers by using Mueller matrix calculus. A model was developed using the Mueller Matrices formulation to evaluate the polarization sensitivity of the space-borne grating spectrometers. The optical components are treated as general diattenuators with phase retardance. The correction for this polarization sensitivity is based on broadband polarization measurements. Accurate preflight polarisation calibration of space-borne grating spectrometers is essential for the observational objectives of the instrument, and a special facility has been developed in order to allow the instrument to be calibrated.

Paper Details

Date Published: 21 February 2014
PDF: 7 pages
Proc. SPIE 9142, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics: Optical Imaging, Remote Sensing, and Laser-Matter Interaction 2013, 91421C (21 February 2014); doi: 10.1117/12.2054036
Show Author Affiliations
Fa-cai Zhao, The 41st Research Institute of China Electronics Technology Group Corp. (China)
Quan-she Sun, The 41st Research Institute of China Electronics Technology Group Corp. (China)
Kun-feng Chen, The 41st Research Institute of China Electronics Technology Group Corp. (China)
Xing-bang Zhu, The 41st Research Institute of China Electronics Technology Group Corp. (China)
Shao-shui Wang, The 41st Research Institute of China Electronics Technology Group Corp. (China)
Guo-quan Wang, The 41st Research Institute of China Electronics Technology Group Corp. (China)
Xiang-liang Zheng, The 41st Research Institute of China Electronics Technology Group Corp. (China)
Zhong Han, The 41st Research Institute of China Electronics Technology Group Corp. (China)


Published in SPIE Proceedings Vol. 9142:
Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics: Optical Imaging, Remote Sensing, and Laser-Matter Interaction 2013
Jorge Ojeda-Castaneda; Shensheng Han; Ping Jia; Jiancheng Fang; Dianyuan Fan; Liejia Qian; Yuqiu Gu; Xueqing Yan, Editor(s)

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