Decoupling control for position error and surface error of segmented primary mirror

Bing Dong; Xin Yu; Xiaofang Zhang; Xiao Wang

doi:10.1117/12.831436

5 May 2009 Decoupling control for position error and surface error of segmented primary mirror

Bing Dong, Xin Yu, Xiaofang Zhang, Xiao Wang

Proceedings Volume 7281, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 72810C (2009) https://doi.org/10.1117/12.831436
Event: AOMATT 2008 - 4th International Symposium on Advanced Optical Manufacturing, 2008, Chengdu, Chengdu, China

Abstract

Large-aperture segmented primary mirror has been widely used in high-resolution space telescopes. After deployment, position error and surface error of each segmented mirror will lead inacceptable wavefront errors together. A critical problem is how to decouple position error and surface error from exit-pupil wavefront aberrations. We proposed a decoupling control strategy based on sensitivity matrix retrieval method. The sensitivity matrix of segmented mirror is calculated by simulation method and a new type of orthogonal polynomials is recommended to fit wavefront aberrations in non-circular area. First we give a simulation example to show how to decouple position errors in each degree of freedom if there are no surface errors. Then a further simulation reveals the decoupling control process for position and surface errors. The low order aberrations are corrected by position control actuators and high order aberrations are corrected by figure control actuators.

Citation Download Citation

Bing Dong, Xin Yu, Xiaofang Zhang, and Xiao Wang "Decoupling control for position error and surface error of segmented primary mirror", Proc. SPIE 7281, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 72810C (5 May 2009); https://doi.org/10.1117/12.831436

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KEYWORDS

Wavefront aberrations

Mirrors

Actuators

Phase modulation

Space telescopes

Wavefronts

Error control coding

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