Research on Quartz Flat Mirror’s Thermal Deformation under the Condition of Non Uniform Heating

Abstract:

The optical system used in aerospace works under a very difficult aerospace condition. The temperature difference between the sides which one is facing the sun and the other one is opposite the sun can reach about 200°C. These temperature grids can bring thermal deformation to the optical components and then influence the whole system’s image or detect results. To measure and analysis the deformation, we first use finite element method to establish a heat exchange model with definite temperature boundary condition to simulate the thermal distribution situation of an optical mirror, and then we establish a laboratory experimental environment and use the thermal imager to measure the temperature distribution on the surface of the mirror and use Zygo GPI XP-D/1000 interferometer to measure the thermal deformation, from the experimental results, we can see that the definite temperature boundary condition is good enough. And the definite flow boundary condition is not necessary under this non uniform heating situation. Key Words: thermal deformation, finite element model, non uniform heating

• Periodical: Materials Science Forum (Volumes 704-705)
• Pages: 229-235
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.704-705.229
• Online since: December 2011
• Authors: Suian Dai, Sheng Li Chang, Yong Lan, Jian Feng Luo, Fei Wang
• Keywords: Finite Element Model (FEM), Non Uniform Heating, Thermal Deformation

References

[1] Liu Haibo, Tan JI chun, Shen Benjian. Star optical system for heat/structure/optical analysis. Aerospace journals, 2010, 31 (3): 875-879.

[2] Liu Haibo, Hao Yuncai, et al. Drawtube Thermal Deformation on the Star Sensor Measurement Accuracy. space control technology and application, 2008, 34 (5): 22-25.

[3] Tan Wei, Luo Jianfeng, et al. Research on Effects of Temperature on Star optical system with displacement of Image Surface. optical technology, 2009, 35 (2): 86-89.

[4] Zhang Liangliang, Wang Gaoming, et al. Temperature Box Entrance windows Programme and Temperature Field Simulation. Laser and Infrared . 2009, 39 (2): 201-203.

[5] Cheng Xuetao, Xu Xianghua, Liang Xingang. Homogenization of Field on Temperature and Temperature Gradient. China Science E series: Technical Science, 2009, 39 (10): 1730-1735.

[6] Juergens, R.C. & Coronato, P.A. Improved method for transfer of FEA results to optical codes. SPIE, 2003, 5174, 106-15.

[7] Liebe, C.C. Accuracy performance of star trackers-A tutorial. IEEE Trans. Aerospace Electr. Syst., 2002, 38(2), 587-99.

DOI: 10.1109/taes.2002.1008988

[8] Li Weite, Huang Baohai, et. Thermal Stress Analysis and Applications. China Eelectric Power Press. The first edition in June (2004).

[9] Li Renxian. Finite Element Method. Defense Industry Press . Second Edition in May (2002).

[10] Yao Zhongpeng, Wang Ruijun. Heat Transfer Theory. Beijing University of Technology Press . The 2nd Edition in September (2003).

[11] Lu Mingwan, Luo Xuefu. elasticity theory based. Tsinghua University Press，Augest 2001, 2nd Edition.