On-Orbit Thermal Distortion and Optical Performance Evaluation of FORMOSAT-5 Remote Sensing Instrument

Chen Ching-Wei; Chen Chia-Ray; Cheng-En Ho; Mei-Yi Yang; Shenq-Tsong Chang; T.-M. Huang

doi:10.1117/12.928282

11 October 2012 On-orbit thermal distortion and optical performance evaluation of FORMOSAT-5 remote sensing instrument

Chen Ching-Wei, Chen Chia-Ray, Cheng-En Ho, Mei-Yi Yang, Shenq-Tsong Chang, T.-M. Huang

Proceedings Volume 8486, Current Developments in Lens Design and Optical Engineering XIII; 848603 (2012) https://doi.org/10.1117/12.928282
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

Abstract

FORMOSAT-5 is the first space program that National Space Organization (NSPO) takes full responsibility for the complete satellite system engineering design including payload(s). FORMOSAT-5 will operate in a sun synchronous orbit at 720-km altitude with 98.28-degree inclination angle. The optical Remote Sensing Instrument (RSI) can provide 2-m resolution panchromatic and 4-m resolution multi-spectral images. A Cassegrain type of RSI with two reflective aspheric mirrors and spherical corrector lens is designed. The space thermal environment is one of the important factors that affect the image quality of a space optical RSI. Thermal deformation of RSI structure and mirrors will impact the optical performance. Some preliminary thermal and opto-mechanical analyses are conducted. The relationship among temperature distributions, thermal deformations and image degradation of on-orbit behaviors are discussed. The thermal induced instabilities are incorporated in optical models (e.g., OSLO) by use of Zernike polynomial coefficients to calculate the system MTF and WFE. Due to different thermal environments, on-orbit optical performances depend on imaging locations. Detailed studies and discussions are done in this paper to identify the major sources of thermal deformations and their impacts on image quality.

Citation Download Citation

Chen Ching-Wei, Chen Chia-Ray, Cheng-En Ho, Mei-Yi Yang, Shenq-Tsong Chang, and T.-M. Huang "On-orbit thermal distortion and optical performance evaluation of FORMOSAT-5 remote sensing instrument", Proc. SPIE 8486, Current Developments in Lens Design and Optical Engineering XIII, 848603 (11 October 2012); https://doi.org/10.1117/12.928282

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KEYWORDS

Thermography

Satellites

Mirrors

Modulation transfer functions

Thermal effects

Remote sensing

Distortion

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