Experimental research of the deterministic controlling process of surface figure in the large-aperture annular polishing

2017 ◽  
Author(s):  
Minghong Yang ◽  
Jianda Shao ◽  
Xueke Xu ◽  
Aihuan Dun ◽  
Lunzhe Wu ◽  
...  
Keyword(s):  
Experimental Research ◽  
Large Aperture ◽  
Surface Figure

Experimental research on wave-front coded imaging technique applied to large aperture space-borne optical camera

2021 ◽  
Author(s):  
Hui Zhao ◽  
Jiao Mi ◽  
Chuang Li ◽  
Gangyi Zou ◽  
Xuewu Fan ◽  
...  
Keyword(s):  
Wave Front ◽  
Experimental Research ◽  
Imaging Technique ◽  
Large Aperture

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.

scholarly journals Lightweight Design of Multi-Objective Topology for a Large-Aperture Space Mirror

2018 ◽  
Vol 8 (11) ◽  
pp. 2259 ◽  
Author(s):  
Yanjun Qu ◽  
Yanru Jiang ◽  
Liangjie Feng ◽  
Xupeng Li ◽  
Bei Liu ◽  
...  
Keyword(s):  
Objective Function ◽  
Design Method ◽  
Lightweight Design ◽  
Multi Objective ◽  
Large Aperture ◽  
A Value ◽  
Sensitivity Analysis Method ◽  
Key Techniques ◽  
Surface Figure ◽  
Polishing Pressure

For a large-aperture space telescope, one of the key techniques is the method for designing the lightweight primary mirror assembly (PMA). In order to minimize the mirror surface error under axial gravity, lateral gravity, and polishing pressure at the same time, a method for topology optimization with multi-objective function combined with parametric optimization is introduced in this paper. The weighted compliance minimum is selected as the objective function to maximum the mirror structural stiffness. Then sensitivity analysis method and size optimization are used to determine the mirror structure parameters. Compared with two types of commonly used lightweight configurations, the new configuration design shows obvious superiority. In addition, the surface figure root mean square (RMS) of the mirror mounted by given bipod flexure (BF) under 1 g lateral gravity is minimized only with a value of 3.58 nm, which proves the effectiveness of the design method proposed in this paper.

Experimental Research on Gain Characteristic in Large Aperture Active Mirror Slab Amplifiers

2013 ◽  
Vol 40 (4) ◽  
pp. 0402007 ◽  
Author(s):  
刘晶 Liu Jing ◽  
施翔春 Shi Xiangchun ◽  
李磊 Li Lei ◽  
程小劲 Cheng Xiaojin ◽  
杨中国 Yang Zhongguo ◽  
...  
Keyword(s):  
Experimental Research ◽  
Large Aperture ◽  
Gain Characteristic ◽  
Active Mirror

Mounting Ways and Surface Figure of Large-Aperture KDP Crystal

2011 ◽  
Vol 48 (8) ◽  
pp. 081404
Author(s):  
曹庭分 Cao Tingfen ◽  
熊召 Xiong Zhao ◽  
徐旭 Xu Xu ◽  
倪卫 Ni Wei ◽  
袁晓东 Yuan Xiaodong
Keyword(s):  
Kdp Crystal ◽  
Large Aperture ◽  
Surface Figure

Secondary Transfer Effect of Contact

2009 ◽  
Vol 40 (2) ◽  
pp. 55-65 ◽  
Author(s):  
Thomas F. Pettigrew
Keyword(s):  
Cognitive Dissonance ◽  
Experimental Research ◽  
Intergroup Contact ◽  
Transfer Effect ◽  
Evaluative Conditioning ◽  
Transfer Effects ◽  
Secondary Transfer ◽  
Primary Reduction

This paper reviews the evidence for a secondary transfer effect of intergroup contact. Following a contact’s typical primary reduction in prejudice toward the outgroup involved in the contact, this effect involves a further, secondary reduction in prejudice toward noninvolved outgroups. Employing longitudinal German probability samples, we found that significant secondary transfer effects of intergroup contact exist, but they were limited to specific outgroups that are similar to the contacted outgroup in perceived stereotypes, status or stigma. Since the contact-prejudice link is bidirectional, the effect is inflated when prior prejudice reducing contact is not controlled. The strongest evidence derives from experimental research. Both cognitive (dissonance) and affective (evaluative conditioning) explanations for the effect are offered.

Review of Foundations of Experimental Research. 3rd ed.

1983 ◽  
Vol 28 (10) ◽  
pp. 805-805
Author(s):  
Roger E. Kirk
Keyword(s):  
Experimental Research
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