Stray radiation analysis of infrared optical system in multispectral camera

Liu Xin; Huang Yifan; Li Lin; Jin Xiaorui

The performance of the multispectral infrared camera is seriously influenced by the stray radiation. In order to ensure that the camera can work properly in all situations, the stray radiation in different working conditions needs to be analyzed. The main sources of the stray radiation in the infrared optical system of a camera were analyzed. The model of the multispectral infrared camera was established in the stray light analysis software. The irradiance of the imaging plane was used to evaluate the stray radiation level. Taking the influence of the solar azimuth and the off-axis angle into consideration, around the hood, 8 solar azimuths and 16 different off-axis angles were selected to carry out the ray tracing. Thus the irradiance of the imaging plane for every certain condition was obtained. And the effect to the irradiance of the imaging plane caused by the rotation of the pointing mirror which was composed of roller shaft and pitching axis was analyzed. Meanwhile the influence of the earth atmosphere stray radiation was also discussed. The results show that the earth atmosphere stray radiation is tolerable. And the system can basically satisfy the requirement to the imaging plane irradiance when the off-axis angle is greater than 58. The infrared optical system of the multispectral camera can work well within this range.

1. School of Optoelectronics,Beijing Institute of Technology,Beijing 100081,China

Received Date: 2013-04-18

Rev Recd Date: 2013-05-19

Publish Date: 2013-12-25

Key words:

Abstract: The performance of the multispectral infrared camera is seriously influenced by the stray radiation. In order to ensure that the camera can work properly in all situations, the stray radiation in different working conditions needs to be analyzed. The main sources of the stray radiation in the infrared optical system of a camera were analyzed. The model of the multispectral infrared camera was established in the stray light analysis software. The irradiance of the imaging plane was used to evaluate the stray radiation level. Taking the influence of the solar azimuth and the off-axis angle into consideration, around the hood, 8 solar azimuths and 16 different off-axis angles were selected to carry out the ray tracing. Thus the irradiance of the imaging plane for every certain condition was obtained. And the effect to the irradiance of the imaging plane caused by the rotation of the pointing mirror which was composed of roller shaft and pitching axis was analyzed. Meanwhile the influence of the earth atmosphere stray radiation was also discussed. The results show that the earth atmosphere stray radiation is tolerable. And the system can basically satisfy the requirement to the imaging plane irradiance when the off-axis angle is greater than 58. The infrared optical system of the multispectral camera can work well within this range.

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Reference (7)

[1]	Ghaffarian B. Solar intrusion thermal analysis[C]//SPIE, 1996, 2812: 251-259.
[2]	Shi Rongbao, Zhou Jiankang, Ji Yiqun, et al. Stray light analysis and baffle design of remote sensing camera for microsatellite[C]//SPIE, 7506, 2009: 75060T-1-7.
[3]	Reininger F. Stray light performance optimization through system design[C]//SPIE, 2260, 1994: 17-28.
[4]	Stauder J L. Stray light design and analysis of the Wide-Field Infrared Explorer(WIRE)[C]//SPIE, 3122, 1997: 35-44.
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[6]	Du Baolin. Research and protection of stray radiation in space remote sensor [D]. Beijing: Beijing Institute of Technology, 2010: 36-37. (in Chinese) 杜保林. 空间遥感器的杂散辐射研究与防护[D]. 北京: 北京理工大学, 2010: 36-37.
[7]	Du Shusong, Wang Yongmei, Du Guojun, el al. Stray light analysis of fabry-perot interference imaging spectrometer[J]. Journal of Applied Optics, 2009, 30(2): 246-251. (in Chinese) 杜述松, 王咏梅, 杜国军, 等. 干涉成像光谱仪的杂散光分析[J]. 应用光学, 2009, 30(2): 246-251. (in Chinese)

[1]	Ghaffarian B. Solar intrusion thermal analysis[C]//SPIE, 1996, 2812: 251-259.
[2]	Shi Rongbao, Zhou Jiankang, Ji Yiqun, et al. Stray light analysis and baffle design of remote sensing camera for microsatellite[C]//SPIE, 7506, 2009: 75060T-1-7.
[3]	Reininger F. Stray light performance optimization through system design[C]//SPIE, 2260, 1994: 17-28.
[4]	Stauder J L. Stray light design and analysis of the Wide-Field Infrared Explorer(WIRE)[C]//SPIE, 3122, 1997: 35-44.
[5]	Schwartz R, Bloomberg S, Mom M, el al. Stray radiation in airborne FLIR system[C]//SPIE, 4820, 2003: 676-687.
[6]	Du Baolin. Research and protection of stray radiation in space remote sensor [D]. Beijing: Beijing Institute of Technology, 2010: 36-37. (in Chinese) 杜保林. 空间遥感器的杂散辐射研究与防护[D]. 北京: 北京理工大学, 2010: 36-37.
[7]	Du Shusong, Wang Yongmei, Du Guojun, el al. Stray light analysis of fabry-perot interference imaging spectrometer[J]. Journal of Applied Optics, 2009, 30(2): 246-251. (in Chinese) 杜述松, 王咏梅, 杜国军, 等. 干涉成像光谱仪的杂散光分析[J]. 应用光学, 2009, 30(2): 246-251. (in Chinese)

Stray radiation analysis of infrared optical system in multispectral camera

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