Kepler primary mirror assembly: FEA surface figure analyses and comparison to metrology

2007 ◽  
Author(s):  
John W. Zinn ◽  
George W. Jones
Keyword(s):  
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.

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

Research on the Support and Gravitational Deformation of Large Aperture Primary Mirror of Space Telescopes

2012 ◽  
Vol 516 ◽  
pp. 181-185
Author(s):  
Yang Lin Peng ◽  
Yi Fan Dai ◽  
Shan Yong Chen
Keyword(s):  
Body Motion ◽  
Space Telescopes ◽  
Key Factors ◽  
Support Design ◽  
Element Analysis ◽  
Primary Mirror ◽  
Imaging Quality ◽  
Large Aperture ◽  
Support Methods ◽  
Surface Figure

The surface figure of the primary mirror in a large aperture telescope is one of the key factors influencing imaging quality. Space telescopes are used in weightless environments, which is different from the ground environment for optical machining and testing. Therefore the effect of the deformation induced by gravity on the imaging quality is not negligible and the mirror support is to be carefully designed to unload the gravity during the course of machining and testing. In this paper, finite element analysis software is adopted to simulate and compare the deformation induced by gravity of a metre-scale aspheric lightweight primary mirror with different support methods and different working conditions. The results are then imported into MetroPro software supplied by ZYGO Corporation, to remove the tilts and rigid body motion of the mirror and calculate the primary aberrations from the deformation. Finally, sensitivity analysis of support deformation is implemented and the principles of mirror support design are summarized. The research is instructive for design, machining and testing of large aperture mirrors.

Structural Design of Primary Mirror Subassembly for Space Telescope

2013 ◽  
Vol 300-301 ◽  
pp. 903-906
Author(s):  
Hong Xu
Keyword(s):  
Structural Design ◽  
Material Selection ◽  
Thermal Characteristics ◽  
The Finite Element Method ◽  
Location Selection ◽  
Primary Mirror ◽  
Gravity Load ◽  
Lightweight Structure ◽  
Method Analysis ◽  
Surface Figure

In order to design a large aperture primary mirror with the diameter of 1150 mm, the parameters impacting on gravity deformation of the mirror were analyzed and discussed in detail, including material selection, diameter-thickness ratio, the number of the support points, location selection and lightweight structure, etc. A novel space mirror structure system was put forward, and its back was opened and supported by six points on back. The dynamic and static and thermal characteristics were analyzed based on the finite element method. Analysis results showed the surface figure accuracy reached to RMS 14.5nm under the action of gravity load along the optical axis direction and the first-order natural frequency was 214Hz which met to the designed indexes requirements.

Thermal control of primary mirror of Space Solar Telescope

Optik ◽  
2021 ◽  
Vol 229 ◽  
pp. 166290
Author(s):  
Shuang Yang ◽  
Changshuai Du ◽  
Xianwei Yang ◽  
Chunlong Liu ◽  
Yan Xiong ◽  
...  
Keyword(s):  
Thermal Control ◽  
Solar Telescope ◽  
Primary Mirror ◽  
Space Solar Telescope
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