Stray Light Suppression in Sweep Mirror Field-Widened Space-Borne Fourier Transform Imaging Spectrometer

Zhinan Zhang; Libo Li; Chunbo Zou; Xiongbo Hao; Jian Sun; Xuebin Liu; Pengchong Wang; Jie Liu

doi:10.3788/AOS202141.1029001

Acta Optica Sinica, Volume. 41, Issue 10, 1029001(2021)

Stray Light Suppression in Sweep Mirror Field-Widened Space-Borne Fourier Transform Imaging Spectrometer

Zhinan Zhang^1,2, Libo Li^1、*, Chunbo Zou¹, Xiongbo Hao¹, Jian Sun^1,2, Xuebin Liu¹, Pengchong Wang¹, and Jie Liu^1,2

¹Key Laboratory of Spectral Imaging Technology, Xian′s Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi′an, Shaanxi 710119, China

²University of Chinese Academy of Sciences, Beijing 100049, China

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Fig. 1. Optical system of imaging spectrometer

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Fig. 2. Incident field of view of imaging spectrometer at different sweep mirror locations

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Fig. 3. Design schematic of outer baffle

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Fig. 4. Design schematic of sweep mirror barrier

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Fig. 5. Design of vanes

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Fig. 6. 3D model of imaging spectrometer

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Fig. 7. PST curves along visible and near-infrared spatial direction

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Fig. 8. PST curves along visible and near-infrared spectral direction

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Fig. 9. PST curves along shortwave infrared spatial direction

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Fig. 10. PST curves along shortwave infrared spectral direction

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Fig. 11. Radiation model of earth atmospheric light

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Table 1. Surface property setting in simulation model

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Table 1. Surface property setting in simulation model

No.	Surface type	Transmittance /%	Absorptance /%	Specular reflectivity /%	BRDF /%	Scatter model
1	Lens surface	97.97	1	1	0.13	Lambertian
2	Reflector surface	0	5	94.87	0.13	Lambertian
3	Interferometer beam splitter	45	10	45	0.13	Lambertian
4	Transmission surface of interferometer	97.97	1	1	0.13	Lambertian
5	Blackened non-working surface	0	90	0.001	9.999	Lambertian

Table 2. Irradiance and signal-to-stray ratio at different sweep mirror locations
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Table 2. Irradiance and signal-to-stray ratio at different sweep mirror locations
Parameter 0° sweep mirror 15° sweep mirror -15° sweep mirror
VNIR SWIR VNIR SWIR VNIR SWIR
Irradiance of stray light (10^-3 W·m^-2) 2.7 1.35 5.6 2.7 4.9 3.7
Signal-to-stray ratio /% 0.1 0.6 0.2 1.2 0.2 1.7

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Zhinan Zhang, Libo Li, Chunbo Zou, Xiongbo Hao, Jian Sun, Xuebin Liu, Pengchong Wang, Jie Liu. Stray Light Suppression in Sweep Mirror Field-Widened Space-Borne Fourier Transform Imaging Spectrometer[J]. Acta Optica Sinica, 2021, 41(10): 1029001

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