超大型航天遥感器评价系统漏孔高效定位方法研究

Efficient Method for Locating Leaky Holes in Ultra-Large Spacecraft Remote Sensor Evaluation Systems

超大型航天遥感器评价系统是用于大口径光学遥感器在地面模拟在轨环境的条件下进行性能测试与评价的试验装置,由真空容器、低温热沉系统、真空获取系统、氮流程系统、外热流模拟装置等组成。真空容器是超大型航天遥感器评价系统的主体,其结构复杂、开孔数量较多、体积庞大,存在泄漏因素多,其漏率指标是影响航天器地面模拟试验工作真空度指标能否实现的关键因素。本文针对真空容器研制过程各个阶段氦质谱检漏方法进行了对比分析,并根据超大型真空容器研制过程的漏孔定位难点进行分析,在研制过程提出了利用氦质谱负压采样法,优化了真空容器氦质谱检漏流程,实现了漏孔快速、高效定位,并在实际工程应用中取得了良好效果。

The ultra-large spacecraft remote sensor evaluation system is a test device used for performance testing and evaluation of large-diameter optical remote sensors under the conditions of a simulated in-orbit environment on the ground,consisting of a vacuum vessel,a low-temperature heat sink system,a vacuum acquisition system,a nitrogen flow system,an external heat flow simulation device and so on.The vacuum vessel is the main body of the evaluation system of the very large spacecraft remote sensing device,and its structure is complex;the number of openings is large,the volume is huge,there are many leakage factors,its leakage rate index is the key factor affecting the spacecraft ground simulation test work vacuum degree index can be achieved.This paper presents a comparative analysis of the helium mass spectrometry leak detection methods for each stage of the vacuum vessel development process.Based on the analysis of the difficulties in locating leaks in the development process of very large vacuum vessels,the use of helium mass spectrometry vacuum sampling is proposed to achieve rapid and efficient leak location in the development process,and good results are achieved in practical applications.