空间超光谱成像仪前置光学系统的热光学特性

张益茬; 刘伟; 胡春晖

空间超光谱成像仪前置光学系统的热光学特性

张益茬^1,2,
刘伟¹,
胡春晖^1,2

1.
中国科学院长春光学精密机械与物理研究所,吉林长春 130033;
2.
中国科学院研究生院,北京 100039

基金项目:

国防预研基金资助项目(No.05001SA050)

详细信息

作者简介:
张益茬(1985—),男,湖南郴州人,硕士研究生,主要从事精密机械及CAD、CAE、CAM方面的研究。 E-mail:zhych6998@163.com 刘伟(1967—),男,吉林长春人,副研究员,主要从事光学遥感仪器方面的研究。 E-mail:2400liuWei@163.com

中图分类号: TP73; TH703
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出版历程
- 收稿日期: 2010-05-11
- 修回日期: 2010-07-13
- 刊出日期: 2010-12-20

Thermal-optical property of fore optical system in space hyper spectral imager

1.
Changchun Institute of Optics,Fine Mechanics and Physics, Chinese Academy of Sciences,Changchun 130033,China;
2.
Graduate University of Chinese Academy of Sciences,Beijing 100039,China

摘要

摘要: 分析了空间超光谱成像仪前置光学系统的热光学特性。应用有限元方法建立了模拟前置光学系统的热弹性变形模型,并进行了热弹性分析计算;用Zernike多项式拟合分析结果,求得各镜子反射面在热变形后的面型误差和相对于初始理想位置的偏移;利用光学分析设计软件Code V计算得到光学系统的像面与焦面的偏离量,即离焦量,并用多项式拟合得到其随温度变化的规律。计算结果表明,前置光学系统的像面在温度改变时会偏离焦面,离焦量与温度近似地成线性关系,当温度升高时像面最大偏移量为107.4 m,温度降低时像面最大偏移量为106.9 m。该分析结果可作为指导超光谱成像仪改进热控措施,进行调焦补偿的理论参考。
- 超光谱成像仪 /
- 离轴反射望远镜 /
- 热光学特性 /
- 离焦量
Abstract: The performance of a hyper spectral imager is affected severely by the turbulence of orbit temperature, which would result in the thermal elastic deformation for the fore reflective telescope in the imager. Moreover, the thermal elastic deformation of mirrors, mechanical structure of the telescope, and the resulting displacements of the mirrors would induce defocusing. Based on the present study for a type of space hyper spectral imager, a model for simulating the thermal elastic deformation of the frontal telescope was built via Finite Element Method. By simulating, the surface deviation amounts and displacements of all the mirrors under different temperature loads were worked out, and the correlation between defocusing magnitude and temperature was obtained through calculating the resulting displacements of the mirrors. The analyzing results could be used as a reference for designing thermal controlling strategy and focusing system and for doing thermal-optical experiments of the developing imager.
- hyper spectral imager /
- off-axial reflective telescope /
- thermal-optical property /
- defocusing amount

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参考文献(1)

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