Share Email Print
cover

Proceedings Paper

Development and alignment for SiC mirror subsystem of a space-borne telescope
Author(s): Liangjie Feng; Wei Wang; Guorui Ren
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

A Φ600mm SiC primary mirror subsystem of a space-borne Ritchey-Chretien telescope was designed. The open-back primary mirror was made of pressure-less sintering silicon carbide (SiC), light-weighted at a ratio of approximately 70%. Minimizing the optical surface astigmatism was critical for the mirror, the astigmatism is caused mainly by gravity effects, temperature variation and the bonding process. Three invar flexure bipods were fixed on the baseplate of the telescope at first, and the posture of the primary mirror was adjusted precisely for 0.2mm gap to the bipods. 3M 2216 B/A grey adhesive was then injected into the gap between the mirror and bipod flexure, the curing process was last 72 hours in the room temperature. So the mirror was affected only by curing stress of the adhesive during the assembly process. Structural strength and dynamic stiffness of the mirror subsystem in the thermal- structural coupling state were analyzed with finite element method. Analyzed results show that the optical surface distortion is less than 1/50λ at 632.8nm RMS with three points support and less than 1/200λ RMS with 2°C temperature variation because of the flexure support and compatible support and mirror material, The optical performance test with interferometer show that the optical surface distortion caused by the curing stress of the adhesive is less than 1/50λRMS, the overall optical surface of the primary mirror is less than 1/30λ rms, which met the critical requirements for the primary mirror of the telescope.

Paper Details

Date Published: 19 October 2016
PDF: 6 pages
Proc. SPIE 10154, Advanced Optical Design and Manufacturing Technology and Astronomical Telescopes and Instrumentation, 1015425 (19 October 2016); doi: 10.1117/12.2247416
Show Author Affiliations
Liangjie Feng, Xi'an Institute of Optics and Precision Mechanics (China)
Wei Wang, Xi'an Institute of Optics and Precision Mechanics (China)
Guorui Ren, Xi'an Institute of Optics and Precision Mechanics (China)


Published in SPIE Proceedings Vol. 10154:
Advanced Optical Design and Manufacturing Technology and Astronomical Telescopes and Instrumentation
Min Xu; Ji Yang, Editor(s)

© SPIE. Terms of Use
Back to Top