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Proceedings Paper

The influence of contaminated mirror on the flux distributions of stray radiation of infrared telescope systems
Author(s): Pan He; Jing Xiao; Bin Zhang; Xiuwen Yao
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Paper Abstract

The existence of contaminated mirror in infrared telescope system not only reduces the contrast between objects and background, but also leads to the nonuniformity of the flux distribution of stray radiation on detector, resulting in great difficulty in obtaining and analyzing the target signal. In this paper, taking Cassegrain telescope as a typical example and using the optical analysis software, i.e., ASAP, the three-dimensional simulation model has also been built up. The self-generated thermal radiation flux and the flux distributions of stray radiation on the image plane have been simulated when the primary mirror under two cases, i.e., clean and local area contaminated. The influence of the size and position of the contaminated area on the uniformity of the flux distributions of stray radiation has been focused on discussion. The radiation flux and the flux distributions of stray radiation have been employed to evaluate the stray radiation performance of the system. The results indicate that the local area contamination on mirrors could change the uniformity of the flux distributions on the image plane and also degrade the stray radiation performance of the system, resulting in the influence on the detection and identification of the target. Consequently, it is of critical importance to keep the surface of optical elements clean, especially to avoid local area contamination on optics.

Paper Details

Date Published: 13 October 2010
PDF: 6 pages
Proc. SPIE 7654, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 76540T (13 October 2010); doi: 10.1117/12.867620
Show Author Affiliations
Pan He, Sichuan Univ. (China)
Jing Xiao, Sichuan Univ. (China)
Bin Zhang, Sichuan Univ. (China)
Xiuwen Yao, Sichuan Univ. (China)


Published in SPIE Proceedings Vol. 7654:
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes
Wenhan Jiang; Myung K. Cho; Fan Wu, Editor(s)

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