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Research of suppressing stray light of cold shield with different black coating
Author(s): Yang Wang; Yizhang Shen; Junlin Chen; Lin Xu; Defeng Mo; Dafu Liu
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Paper Abstract

With the development of infrared imaging technology, especially high resolution imaging instrument for space remote sensing, the requirement of suppressing stray light the optical system is more and more high, thus suppression of stray light of IR detector module as the core device of target detection and imaging is important. The design and processing cold shield is the key of infrared focal plane detector dewar for suppressing stray light, which mainly play a role in suppressing stray light outside of field view and improving background limited detectivity of IR detector. The structure of the cold shield is mainly effect Geometry Composing Function (GCF) of the stray radiation transmission, while Black coatings of cold shield influence bidirectional reflectance distribution function (BRDF) of stray radiation transmission. This paper mainly study suppressing stray light of cold shield with black phosphating process and black nickel plating and point source transmittance (PST) is used as the evaluation index for suppression of stray light, which can be measured accurately. A PST test system in near infrared wave band has been set up for measurement of cold shield’s PST, which coupling infrared light source with light guide tube for greatly improving the uniformity of infrared light source, while the dynamic range of test system decrease slightly. After testing and verification, light source instability is less than 1% , Non uniformity of light source at the exit of the parallel light tube is 7.4%@ 87.5mm×87.5mm.and dynamic range of test system is 0~1.5×10-5, thus the test facility can satisfy PST test of stray light. The PST curve with angle for one stage cold shield with black phosphating process and black nickel plating are measured and consistent with numerical simulation, which first decrease rapidly with increase of the angle, then slowly vary after 35 angle for the structure of one stage cold shield, the results is useful for optimizing design of infrared detector modules for control of stray light.

Paper Details

Date Published: 30 January 2019
PDF: 8 pages
Proc. SPIE 10841, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Meta-Surface-Wave and Planar Optics, 1084117 (30 January 2019); doi: 10.1117/12.2504898
Show Author Affiliations
Yang Wang, Shanghai Institute of Technical Physics (China)
Yizhang Shen, Shanghai Institute of Technical Physics (China)
Junlin Chen, Shanghai Institute of Technical Physics (China)
Lin Xu, Shanghai Institute of Technical Physics (China)
Defeng Mo, Shanghai Institute of Technical Physics (China)
Dafu Liu, Shanghai Institute of Technical Physics (China)


Published in SPIE Proceedings Vol. 10841:
9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Meta-Surface-Wave and Planar Optics
Mingbo Pu; Xiaoliang Ma; Xiong Li; Minghui Hong; Changtao Wang; Xiangang Luo, Editor(s)

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