Correcting of thermal and gravitational distortions of primary mirror on space camera by using adaptive optics

Zhiwei Zhang; Xin Yu

doi:10.1117/12.390299

7 July 2000 Correcting of thermal and gravitational distortions of primary mirror on space camera by using adaptive optics

Zhiwei Zhang, Xin Yu

Author Affiliations +

Proceedings Volume 4007, Adaptive Optical Systems Technology; (2000) https://doi.org/10.1117/12.390299
Event: Astronomical Telescopes and Instrumentation, 2000, Munich, Germany

Abstract

The paper describes the necessity of employing AO on space camera to overcome the thermal and gravitational influences in order to improve its image quality. Simulative computation of six cases are made to the thermal distortion of primary mirror of a typical Ritchey-Chretien space optical system by using finite element method. The P-V and RMS values, the Zernike coefficients of the mirror's surface are given. An AO correcting experiment system was designed and completed, both open-loop and close-loop experiments were made. A (Phi) 100 mm K9 glass reflective plane mirror was used as a proportional model of the primary mirror to simulate its thermal distortion. Three typical cases -- axial thermal gradient, radial gradient and the local thermal gradient were selected to simulate the on-orbit environment influences. This experiment results prove that AO can correct the low frequency thermal distortion of primary mirror on space camera and decrease the difficulty of temperature control of space optical system.

Citation Download Citation

Zhiwei Zhang and Xin Yu "Correcting of thermal and gravitational distortions of primary mirror on space camera by using adaptive optics", Proc. SPIE 4007, Adaptive Optical Systems Technology, (7 July 2000); https://doi.org/10.1117/12.390299

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KEYWORDS

Mirrors

Space mirrors

Temperature metrology

Adaptive optics

Cameras

Wavefronts

Control systems

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