Design and fabrication of CGH for 600mm diameter SiC primary mirror surface figure testing

2016 ◽  
Author(s):  
Zhihai Pang ◽  
Zhen Ma ◽  
Xuewu Fan ◽  
Gangyi Zou
Keyword(s):  
Mirror Surface ◽  
Primary Mirror ◽  
Surface Figure

Optimization Analysis for Radial Support by Finite Elements Method

2012 ◽  
Vol 466-467 ◽  
pp. 734-738
Author(s):  
Cheng Ming Li ◽  
Yi Fan Wang
Keyword(s):  
Finite Element ◽  
Finite Elements ◽  
Optimal Solution ◽  
Support Point ◽  
Mirror Surface ◽  
Optimization Analysis ◽  
Primary Mirror ◽  
Finite Element Software ◽  
The Relationship ◽  
Surface Figure

Primary mirror’ surface figure is affected by supporting structure obviously. Especially for large-aperture telescope, the surface figure is significant because of primary mirror’ self-weight. For the requirement of the usage, it’s necessary to minimize the surface figure from self-weight by reasonable supporting scheme. The text optimized support point and force of radial support to minimize the surface figure by finite-element software. At the same time, it studied the relationship between support point and counterweight to reduce the weight of support structure. At last, it gave the optimal solution.

Mirror surface figure evaluation based on power spectral density

2014 ◽  
Vol 7 (1) ◽  
pp. 156-162
Author(s):  
杨飞 YANF Fei ◽  
安其昌 AN Qi-chang ◽  
张景旭 ZHANG Jing-xu
Keyword(s):  
Spectral Density ◽  
Power Spectral Density ◽  
Mirror Surface ◽  
Power Spectral ◽  
Surface Figure

Method of evaluation of a mirror surface figure based on frequency domain and its application for the Giant Steerable Science Mirror of the Thirty Meter Telescope

2015 ◽  
Vol 13 (4) ◽  
pp. 041201-41206 ◽  
Author(s):  
Fei Yang Fei Yang ◽  
Guojun Liu Guojun Liu ◽  
Qichang An Qichang An ◽  
Xuejun Zhang Xuejun Zhang
Keyword(s):  
Frequency Domain ◽  
Mirror Surface ◽  
Method Of Evaluation ◽  
Surface Figure

Research of Statistical Methods for Mirror Surface Figure Error

2016 ◽  
Vol 53 (4) ◽  
pp. 041201
Author(s):  
周平伟 Zhou Pingwei ◽  
马宏财 Ma Hongcai
Keyword(s):  
Statistical Methods ◽  
Mirror Surface ◽  
Surface Figure

scholarly journals Precision Analysis and Error Compensation of a Telescope Truss Structure Based on Robotics

2020 ◽  
Vol 10 (18) ◽  
pp. 6424
Author(s):  
Rui Wang ◽  
Fuguo Wang ◽  
Yuyan Cao ◽  
Honghao Wang ◽  
Xueqian Sun ◽  
...  
Keyword(s):  
Engineering Application ◽  
High Order ◽  
Wavefront Aberration ◽  
Mirror Surface ◽  
Sensitivity Matrix ◽  
Support Structure ◽  
Inverse Kinematic Problem ◽  
Surface Error ◽  
Primary Mirror ◽  
Secondary Mirror

We propose a new secondary mirror support structure assisted by multi-robotics to improve the observation performance of vehicle-mobile telescope systems. A mathematical model of the displacement at the end of the robotic and the variation of telescope pitch angle is established, then the posture of the robotic is optimized by the Jacobian matrix iteration inverse kinematic problem method. Based on the new support structure, a high-order sensitivity matrix is proposed to establish the mapping relationship between the robotic misalignment and the Zernike coefficient, with the accuracy verified via the Monte Carlo method. The method of adjusting the secondary mirror to compensate the aberration caused by the primary mirror is proposed, and the relationship between the primary mirror surface error and the system error is established under different pitch angles before and after compensation. The experiment and simulation results showed that the adjustment calculated by the high-order sensitivity matrix method can effectively compensate for the misalignment caused by the robotics and the primary mirror surface error to a certain degree. After multiple iterations, the root mean square of the wavefront aberration was better than λ/15. This conclusion provides an engineering application reference value for the secondary mirror support and aberration correction technology of the vehicle telescope system.

scholarly journals Surface Figure Metrology for CELT Primary Mirror Segments

2001 ◽  
Author(s):  
G Sommargren ◽  
D Phillion ◽  
L Seppala ◽  
S Lerner
Keyword(s):  
Primary Mirror ◽  
Surface Figure
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