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复合色散棱镜是高分辨力星载成像光谱仪的关键分光元件,其光机支撑是成像光谱仪工程研制阶段必须解决的重要问题。首先介绍了复合色散棱镜的工作原理,在此基础上给出了复合色散棱镜光机支撑的技术指标要求;接着综合考虑了热匹配、密度、弹性模量、可加工性等因素后选择了棱镜支撑结构材料;然后运用温度补偿法解决了复合色散棱镜中一块棱镜与支撑结构材料线膨胀系数不匹配的问题,采用半运动学安装方法对两块棱镜进行支撑;最后给出了复合色散棱镜组件力学和热学分析结果并进行了相应试验。试验结果表明:复合色散棱镜组件一阶基频达301.5Hz,在20℃±5℃温度范围内组合光程差优于0.021λ(λ=632.8nm),能够满足成像光谱仪工程研制需要。
Composite dispersive prism is the key spectroscopic component of high resolution spaceborne imaging spectrometer, and its light machine support is an important issue that must be solved in imaging spectrometer project development phase. Firstly, the working principle of the composite dispersion prism is introduced. Based on the above, the technical requirements of the composite dispersion prism are given. Then the prism is selected after considering the factors such as thermal matching, density, elastic modulus and workability. Then the temperature compensation method is used to solve the problem that the linear expansion coefficient of a prism in the composite dispersion prism is not matched with the support structure material and the semi-kinematic installation method is adopted to support the two prisms. Finally, a composite dispersion prism assembly Mechanical and thermal analysis of the results and the corresponding test. The experimental results show that the first-order fundamental frequency of the composite dispersive prism assembly reaches 301.5Hz, and the combined optical path difference is better than 0.021λ (λ = 632.8nm) in the temperature range of 20 ℃ ± 5 ℃, which can meet the needs of imaging spectrometer engineering.