摘要
离轴三反相机光学元件的不对称性,给相机的温控设计带来较大难度,因此有必要研究各种温度场对离轴三反相机性能的影响,特别是大型离轴三反相机,由于其外形尺寸大、焦距长、构型复杂,增大了研究难度。文章针对某大型离轴三反相机,通过光机热集成分析的方法,研究了其性能受不同温度影响的变化规律,从而为设计合理的热控措施提供依据。通过计算相机真实在轨温度场,得到温度边界条件;利用集成分析软件仿真了10种温度工况下相机光机结构的变形规律;最后利用光学仿真软件计算出光机系统的成像品质。仿真结果表明:若干温度工况下,相机的反射镜更容易产生离焦现象,而不容易产生离轴和倾斜现象;相机对整机径向的温度差最敏感,对轴向的温度差最迟滞;均匀温度变化和单个反射镜的温度差变化对相机的成像品质不产生影响。
The asymmetrical optics increase the difficulty of temperature control design. So it is very necessary to study the performance of the off-axis three-mirror camera affected by various temperature fields. Especially the off-axis three-mirror camera which has big size, long focal length and complex configuration makes it more difficult to study the performance with temperature field changes. In this article, the performance changing laws of the off-axis three-mirror camera affected by various temperature fields are studied. The inte- grated optical-structural-thermal analysis is adopted, which can provide the reasonable basis of temperature control design. The temperature boundary conditions are obtained by simulating the real temperature distribu- tion in orbit. And then the deformation changing laws of the opto-mechanical structure are analyzed under ten temperature conditions. At last, the camera imaging quality is computed. The analysis results show that the defocusing happens easily in various temperature conditions, the camera is most sensitive to the diametrical direction temperature gradient and least sensitive to the axial direction temperature gradient, uniform temperature change and temperature gradient in single mirror don＇t affect the imaging quality of the camera.
作者
姜宏佳
JIANG Hongjia1,2(1 Beijing Institute of Space Mechanics ＆ Electricity, Beijing 100094, China） （2 Beijing Key Laboratory of Advanced Optical Remote Sensing Technology, Beijing 100094, China)
出处
《航天返回与遥感》
CSCD
2018年第1期78-86,共9页
Spacecraft Recovery & Remote Sensing
关键词
光机热集成
仿真分析
离轴三反
光学传递函数
空间相机
integrated analysis of optical-structure-thermal
simulation analysis
off-axis three mirror system
modulation transfer function
space camera
