高分辨率可见与红外一体遥感相机制冷机微振动分析及抑制

Micro-Vibration Analysis and Inhibition of Refrigeration for Visible-Infrared Integrated Space Camera

空间光学遥感器朝着更高分辨率、更高侦测功能密度的方向发展,兼具可见光和红外谱段侦查功能的高分辨率、轻小型相机逐渐成为研究的热点。制冷机的微振动是影响光学遥感器成像品质的关键因素之一。为了量化评估红外制冷机微振动特点及对成像性能的影响,解决微振动对高分率相机成像系统干扰的问题,对脉冲管式斯特林制冷机的微振动产生机理进行了分析,采用固支测力法对微振动性能进行了不同功率和使用状态下的测试和分析。基于制冷机的微振动测试数据,提出了在应用环节隔离微振动传递路径的微振动抑制策略,整机的有限元仿真分析表明制冷机微振动对成像系统的传函影响降为0.02%,证明了其有效性。

Space optical remote sensors are developing in the direction of higher resolution and detection function density.High-resolution,light and small cameras with both visible and infrared detection functions have gradually become a research hotpot. As the main vibration source,the micro-vibration of the refrigerator is one of the key factors affecting the imaging quality of the optical remote sensor. In order to quantitatively evaluate the micro vibration characteristics of infrared refrigerator and its influence on imaging performance,and solve the disturbance of micro vibration to high-resolution imaging system,the micro vibration generation mechanism of pulse tube stirling refrigerator is analyzed,and the micro vibration performance is tested and analyzed under different power and service conditions by fixed support dynamometer.Based on the micro-vibration test of the refrigerator, the micro vibration suppression strategy of micro vibration transmission path in the application link is proposed. The finite element simulation analysis of the whole machine shows that the influence of micro vibration on the imaging system is reduced to 0.02%,which proves its effectiveness.