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

Yangguang Xing; Jilong Peng; Shanshan Wang; Lin Li

doi:10.1117/12.2547967

18 December 2019 A passive optical athermalization design of MWIR catadioptric space remote sensor with high resolution in geosynchronous orbit

Yangguang Xing, Jilong Peng, Shanshan Wang, Lin Li

Author Affiliations +

Proceedings Volume 11341, AOPC 2019: Space Optics, Telescopes, and Instrumentation; 113411V (2019) https://doi.org/10.1117/12.2547967
Event: Applied Optics and Photonics China (AOPC2019), 2019, Beijing, China

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.

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Yangguang Xing, Jilong Peng, Shanshan Wang, and Lin Li "A passive optical athermalization design of MWIR catadioptric space remote sensor with high resolution in geosynchronous orbit", Proc. SPIE 11341, AOPC 2019: Space Optics, Telescopes, and Instrumentation, 113411V (18 December 2019); https://doi.org/10.1117/12.2547967

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KEYWORDS

Remote sensing

Mid-IR

Space sensors

Imaging systems

Remote sensing system design

Chromatic aberrations

Mirrors

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