光学镜头性能测试用深低温降温系统设计及验证

Design and verification of deep cryogenic cooling system for optical lens performance test

单镜组件是遥感器的关键部件,在深低温真空环境下对其进行面形测试和稳定性测试,是获取测试数据和验证其结构设计正确性的必要手段。文章针对某单镜组件地面验证试验需求,建立真空环境下低温镜头深低温背景,采用GM制冷机机械降温技术,对温控系统进行设计、研制以及模拟试验,实现了产品在(60±1)K、(160±1)K、(200±1)K的控温指标以及60~300 K的控温区间。该降温系统为遥感器光学镜头在深低温环境下完成面形测试和稳定性测试提供了重要保障。

Single mirror assembly is one of the key components of remote sensor.It is a necessary means to obtain the measurement data and to verify the correctness of its structural design by testing its surface shape and stability under a deep cryogenic vacuum environment.In this paper,based on the ground verification test of a single mirror assembly,the deep cryogenic background of cryogenic lens under vacuum was established.The design,development and simulation test of the temperature control system were carried out by using the mechanical cooling technology of GM refrigerator.The product temperature control indexes of(60±1)K,(160±1)K,(200±1)K,and the temperature control range of 60 K to 300 K were realized.The cooling system provided an important guarantee measure for the surface shape and stability tests of the remote sensor optical lens in the deep cryogenic environment.