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Proceedings Paper

A passive optical athermalization design of MWIR catadioptric space remote sensor with high resolution in geosynchronous orbit
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Paper Abstract

It has been challenging for medium wave infrared (MWIR) optical imaging system to work in a large temperature range and stationary effective focal length, on account of the thermal effect of optical elements and machinery. Performances of a MWIR space remote sensor in an advanced passive thermal-free design are presented with a fronting R-C system and a rear spherical lens group. A general analytical expression for eliminating thermal defocus and chromatic aberration is obtained, and it is demonstrated that these defocus and aberrations are minimized when this MWIR space remote sensor is operated at a broadband (3um to 5um) and large temperature range (-40°C to 40°C). The ZEMAX software is used to obtain the final parameters of space remote sensor by global optimization, which realize 100% cold shield efficiency. The MWIR space remote sensor has a focal length of 2150mm, F number of 3.58, full field of view of angle of 0.4°×0.4°and pixel size of 15μm. This optical system provides a high ground sample distance (GSD) of 251m and wide single landscape width (SLW) of 251km×251km in geosynchronous orbit. The imaging quality of the space optical remote sensor is almost diffraction limited which can be inferred from metrics such as root-mean-square spot diagram, MTF, wavefront function etc.

Paper Details

Date Published: 18 December 2019
PDF: 6 pages
Proc. SPIE 11341, AOPC 2019: Space Optics, Telescopes, and Instrumentation, 113411V (18 December 2019); doi: 10.1117/12.2547967
Show Author Affiliations
Yangguang Xing, Beijing Institute of Technology (China)
Beijing Institute of Spacecraft Environment Engineering (China)
National Key Lab. of Science and Technology on Reliability and Environment Engineering (China)
Jilong Peng, Beijing Institute of Spacecraft System Engineering (China)
Shanshan Wang, Beijing Institute of Technology (China)
Lin Li, Beijing Institute of Technology (China)

Published in SPIE Proceedings Vol. 11341:
AOPC 2019: Space Optics, Telescopes, and Instrumentation
Suijian Xue; Xuejun Zhang; Carl Anthony Nardell; Ziyang Zhang, Editor(s)

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