Polarization sensitivity error analysis and measurement of a greenhouse gas monitoring instrument

Hai-Yan Luo; Zhi-Wei Li; Zhen-Wei Qiu; Hai-Liang Shi; Di-Hu Chen; Wei Xiong

doi:10.1364/AO.57.010009

Applied Optics
Vol. 57,
Issue 34,
pp. 10009-10016
(2018)
•https://doi.org/10.1364/AO.57.010009

Polarization sensitivity error analysis and measurement of a greenhouse gas monitoring instrument

Hai-Yan Luo, Zhi-Wei Li, Zhen-Wei Qiu, Hai-Liang Shi, Di-Hu Chen, and Wei Xiong

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Hai-Yan Luo, Zhi-Wei Li, Zhen-Wei Qiu, Hai-Liang Shi, Di-Hu Chen, and Wei Xiong, "Polarization sensitivity error analysis and measurement of a greenhouse gas monitoring instrument," Appl. Opt. 57, 10009-10016 (2018)

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Abstract

Greenhouse gas monitoring instruments (GMI) are spatial heterodyne spectroscopy (SHS) sensors that monitor greenhouse gases (GHG) from space. Due to several kinds of polarization-sensitive optical elements in GMIs, to some extent, the instrument becomes a polarization-sensitive sensor. Its polarization sensitivity will reduce the radiometric accuracy and spectral inversion accuracy of GHG column concentration. Theoretical radiation response models for analyzing the polarization sensitivity of a GMI, which is mainly affected by a scanning mirror beam splitter and diffraction gratings, are presented in this paper. Based on these models and the polarization performance testing, the theoretical and experimental results of the main spectral band of a GMI, covering the wavelength range of 1.568–1.583 μm for carbon dioxide ( ${CO}_{2}$ ) detection, have been given. The result shows that the linear polarization sensitivity is less than 0.65% and 1.32% in the nadir (45°, 0°) and in the oblique view direction ( $45 \pm 20 °$ , $\pm 31 °$ ), respectively, and that it meets the qualification requirement for an absolute radiometric calibration accuracy better than 5%. The absolute radiometric calibration accuracy directly affects the accuracy of GHG concentration retrieval.

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	Parameter	Simulation Values
Scanning mirror	$r_{scan, s}^{2}$ (in nadir: 45°,0°)	0.963
	$r_{scan, p}^{2}$ (in nadir: 45°,0°)	0.962
	$r_{scan, s}^{2}$ (in oblique: $45 \pm 20 °$ , $\pm 31 °$ )	0.944
	$r_{scan, p}^{2}$ (in oblique: $45 \pm 20 °$ , $\pm 31 °$ )	0.935
Beam splitter	$r_{bs, s}^{2}$	0.66
	$r_{bs, p}^{2}$	0.36
	$t_{bs, s}^{2}$	0.34
	$t_{bs, p}^{2}$	0.64
Diffraction grating	$d_{s}^{2}$	0.82
Diffraction grating	$d_{t}^{2}$	0.79

Angle Range	Fitting Parameters
Angle Range	$k S$	${DC}_{0}$	$ϵ$	$χ_{0}$	$Adj . R - square$	RMSE
0–180°	4562	1343	0.6446%	113.48	0.9918	1.975
30–180°	4562	1343	0.6224%	113.81	0.9962	1.128

	Parameter	Simulation Values
Scanning mirror	$r_{scan, s}^{2}$ (in nadir: 45°,0°)	0.963
	$r_{scan, p}^{2}$ (in nadir: 45°,0°)	0.962
	$r_{scan, s}^{2}$ (in oblique: $45 \pm 20 °$ , $\pm 31 °$ )	0.944
	$r_{scan, p}^{2}$ (in oblique: $45 \pm 20 °$ , $\pm 31 °$ )	0.935
Beam splitter	$r_{bs, s}^{2}$	0.66
	$r_{bs, p}^{2}$	0.36
	$t_{bs, s}^{2}$	0.34
	$t_{bs, p}^{2}$	0.64
Diffraction grating	$d_{s}^{2}$	0.82
Diffraction grating	$d_{t}^{2}$	0.79

Angle Range	Fitting Parameters
Angle Range	$k S$	${DC}_{0}$	$ϵ$	$χ_{0}$	$Adj . R - square$	RMSE
0–180°	4562	1343	0.6446%	113.48	0.9918	1.975
30–180°	4562	1343	0.6224%	113.81	0.9962	1.128

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Applied Optics