Layout of thin catadioptric system and mounting impact analysis of its metal primary mirror

Long Bo; Xing Tingwen; Liao Sheng; Huang Zhiqiang

The thin catadioptric system included a metal high-order aspherical primary mirror having an 80 mm aperture, and the distance between the optical vertex of primary mirror and the image interface was only 17.5 mm. To assure the layout of all components successfully and meanwhile thicken the mirror body effectively to enhance the stiffness, the primary mirror with 3 mounting ears was designed, and measures of components combination and crisscross mounting frontward in the same circumferential ring were implemented. Moreover, to evaluate the surface figure of metal mirror under mounting stress，bolt pretension was simulated by using the pretension element in ANSYS, and on the basis of modal check, primary mirror models including flexural supporting structure of different thickness were built and wavefront deformation at mounting state was analyzed. Meanwhile, the instance of flatness diversity of mounting interfaces was considered. The schemes of mirror assembly structure with restricted axial distance, the integrated analysis way of mounting stress simulation on wavefront deformation, and measures to decrease the distortion provide the reference on the optomechanical design to increase the mirror surface accuracy after assembling thus assuring the system image quality.

1. The Institute of Optics and Electronics,the Chinese Academy of Sciences,Chengdu 610209,China;

2. University of Chinese Academy of Sciences,Beijing 100049,China

Received Date: 2013-07-12

Rev Recd Date: 2013-08-14

Publish Date: 2014-03-25

Key words:

Abstract: The thin catadioptric system included a metal high-order aspherical primary mirror having an 80 mm aperture, and the distance between the optical vertex of primary mirror and the image interface was only 17.5 mm. To assure the layout of all components successfully and meanwhile thicken the mirror body effectively to enhance the stiffness, the primary mirror with 3 mounting ears was designed, and measures of components combination and crisscross mounting frontward in the same circumferential ring were implemented. Moreover, to evaluate the surface figure of metal mirror under mounting stress，bolt pretension was simulated by using the pretension element in ANSYS, and on the basis of modal check, primary mirror models including flexural supporting structure of different thickness were built and wavefront deformation at mounting state was analyzed. Meanwhile, the instance of flatness diversity of mounting interfaces was considered. The schemes of mirror assembly structure with restricted axial distance, the integrated analysis way of mounting stress simulation on wavefront deformation, and measures to decrease the distortion provide the reference on the optomechanical design to increase the mirror surface accuracy after assembling thus assuring the system image quality.

HTML

Reference (21)

[1]	Cao Yinhua, Li Lin, Wang Zhiyong. Applications of aspherical metallic mirrors for infrared thermal imaging systems[J]. Infrared Technology, 2006, 28(7): 373-377. (in Chinese) 曹银花, 李林, 王智勇. 非球面金属反射镜在红外热成像系统中的应用研究[J]. 红外技术, 2006, 28(7): 373-377.
[2]
[3]	Shen Mangzuo, Ma Wenli, Liao Sheng, et al. Development of a cryogenic optical system [J]. Acta Optica Sinica, 2001, 21 (2): 202-205. (in Chinese) 沈忙作, 马文礼, 廖胜, 等. 低温光学系统的研制[J]. 光学学报, 2001, 21(2): 202-205.
[4]
[5]
[6]	Rozelot Jean P, Leblanc Jean M. Metallic alternative to glass mirrors (active mirrrors in aluminium). A review [C]// Proceedings of SPIE, Space Astronomical Telescopes and Instruments, 1991, 1494: 481-490.
[7]	Zhang Xuejun, Li Zhilai, Zhang Zhongyu. Space telecope aspherical mirror structure design based on SiC material [J]. Infrared and Laser Engineering, 2007, 36(5): 577-582. (in Chinese) 张学军, 李志来, 张忠玉. 基于SiC 材料的空间相机非球面反射镜结构设计[J]. 红外与激光工程, 2007, 36(5): 577-582.
[8]
[9]
[10]	Lee Feinberg. Space telescope design considerations [J]. Optical Engineering, 2012, 51(1): 011006-1.
[11]
[12]	Ahmad A. Low distortion mounting techniques for metal mirrors [C]//Proceedings of SPIE, Conference on Current Developments in Optical Design and Engineering, 1998, 3429: 62-70.
[13]	Li Huixun, Hu Yingchun, Zhang Jianzhong. Study on simulating bolt pretension by using ANSYS [J]. Journal of Shandong University of Science and Technology (Natural Science Edition), 2006, 25(1): 57-59. (in Chinese) 李会勋, 胡迎春, 张建中. 利用ANSYS 模拟螺栓预紧力的研究. 山东科技大学学报(自然科学版), 2006, 25(1): 57-59.
[14]
[15]	Lin Liming, Wu Qingwen, Liu Hongwei, et al. Design and analysis for mirror supporting structure of space camera [J]. Journal of Changchun University of Science and Technology (Natural Science Edition), 2008, 31 (1): 45-48. (in Chinese) 林利明, 吴清文, 刘宏伟, 等. 空间相机反射镜支撑结构的设计与分析[J]. 长春理工大学学报(自然科学版), 2008, 31(1): 45-48.
[16]
[17]	Yoder Paul R, Jr. Opto-Mechanical Systems Design[M]. 3rd ed. Boca Raton:CRC Press, 2006.
[18]
[19]	Ma Wenli, Shen Mangzuo, Zhang Xiaohong. The method for improving the surface shape accuracy of large metal primary mirror[J]. Opto-Electronic Engineering, 1996, 23(6): 18-22. (in Chinese) 马文礼, 沈忙作, 张晓宏. 提高大口径金属主镜面形精度的方法[J]. 光电工程, 1996, 23(6): 18-22.
[20]
[21]	Daniel Vukobratovich. Flexture mounts for high-resolution optical elements [C]//Proceedings of SPIE, Optomechanical and Electro-Optical Design of Industrial Systems, 1988, 0959: 18-36.

Layout of thin catadioptric system and mounting impact analysis of its metal primary mirror

Abstract

References

Proportional views

通讯作者: 陈斌, bchen63@163.com

Article Metrics

Related

Proportional views