30 May 2006 Active support of ultra thin mirror
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Proceedings Volume 6148, 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 61480X (2006) https://doi.org/10.1117/12.674128
Event: 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2005, Xian, China
Abstract
Optical system in the future will require primary mirror that push beyond the current state of technology for mirror fabrication. The mirrors will be very large and have low mass per unit area, and must maintain diffraction limited performance at the work surroundings. As a result, the conceive of segmented ultra thin mirror has been brought forward and are now in its research. We should develop primary mirror that has 2-4mm glass membrane which is attached to a stiff lightweight support structure through a set of actuators. In this paper, some analyse and computing simulation for active ultra thin mirror surface by using finite element method (FEM) are introduced:(1) simulating an ultra thin mirror with an aspect ratio of 250:1 by software "patran";(2) Computing the deformation of the ultra thin mirror supported by different supporting mode in its vertical position under gravity. The final supporting mode is selected and the result of optical surface accuracy of computer simulation is less thanλ/30(λ=632.8nm, RMS);(3) With the Zernike polynomials several low-order aberrations are got, which simulate the surface error after ultra thin mirror fabrication and the deformation because of change of work surroundings. After getting the influence function of single actuator, the actuators can be controlled actively and the supporting mode optimized, thus compensating the surface residual error caused by manufacturing and surroundings on computer simulation. The result of optical surface accuracy of the computer simulation is less thanλ/30(λ=632.8nm, RMS).
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Ying Ni, Ying Ni, Jingchi Yu, Jingchi Yu, } "Active support of ultra thin mirror", Proc. SPIE 6148, 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 61480X (30 May 2006); doi: 10.1117/12.674128; https://doi.org/10.1117/12.674128
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