Translator Disclaimer
7 September 2013 The optical performance test of lightweight primary mirror of space Cassegrain telescope
Author Affiliations +
The Remote sensing instrument ( RSI ) under developing is a Cassegrain telescope with clear aperture of 450 mm. In order to meet specifications for thermal distortion, self-weight deformation of the mirror and weight budget of the system, the primary mirror has been lightweighted at the ratio about 50 % with hexagon cell structures from a Zerodur blank. For this mid-large lightweight mirror, the optical performance test is challenging during both the manufacture and assembly phases. While in the optical measurement, there are some unexpected errors caused erroneous judgments for the mirror induced by the external force or environmental deviation. For example, it’s difficult to specify the measured astigmatism caused from the form error after polishing or surface deformation by the external force from the supporter or mechanical mount. In this paper, the optical performance test called bench test to get the absolute measurement result for the lightweight mirror is presented. After measurement, a novel algorithm is adopted to analyze the astigmatism caused from the gravity effect and form error from manufacture and the deformation from the mounting or supporter. Also, the measurements with different supporter compared with vertical and horizontal setup are compared in the end of this article.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Wei-Cheng Lin, Shenq-Tsong Chang, Ting-Ming Huang, Ming-Ying Hsu, and Yu-Chuan Lin "The optical performance test of lightweight primary mirror of space Cassegrain telescope", Proc. SPIE 8838, Optical Manufacturing and Testing X, 883812 (7 September 2013);


A method of gravity elimination in the testing process by...
Proceedings of SPIE (November 05 2020)
Active Optics From The Test Set Up To The...
Proceedings of SPIE (September 20 1989)
In-process metrology for large astronomical mirrors
Proceedings of SPIE (November 01 1990)
Possible control and testing of concave telescope mirrors
Proceedings of SPIE (September 18 1997)
Using the Shack Hartmann system for a complete analysis of...
Proceedings of SPIE (November 01 1997)

Back to Top