基于常压氦质谱累积检漏的定/变容漏率标定技术研究  

Impact Factors on Leakage Rate Calibration of Spacecraft in Accumulation Leak Detection with Helium Mass Spectrometer at Atmospheric Pressure

作　　者：李宏宇 彭光东 韩洋 陈丽 Li Hongyu;Peng Guangdong;Han Yang;Chen Li(Shanghai Institute of Spacecraft Equipment,Shanghai 200240,China)

机构地区：[1]上海卫星装备研究所,上海200240

出　　处：《真空科学与技术学报》2018年第12期1033-1038,共6页Chinese Journal of Vacuum Science and Technology

摘　　要：漏率标定技术是航天器密封性能检测的重要组成部分,直接决定计算漏率的大小。为减小漏率标定测试数据误差,提高检测精度,本文基于常压氦质谱累积检漏法,通过理论分析与实验,研究了注入氦气量、收集室体积、航天器漏率等参数对漏率标定数据的影响。结果表明,测试数据与注入的氦气量呈线性关系,并随着收集室体积的增加而减小;收集室累积空间体积在30～100 m^3之间时,漏率标定测试数据变化率在10-9量级且相对稳定,有助于完善漏率标定数学模型;通过标准漏孔模拟航天器的漏率,当漏率小于1×10^(-4)Pa·m^3/s时,标定测试数据(1 h内)相对偏差小于30%,同时可采取缩短漏率标定时间、风机循环使氦气分布均匀等方式提高航天器的漏率检测精度。The influence of the three variables,including the quantity of filled helium,collection chamber volume and leakage-rate of realistic spacecraft,on the precision of leakage-rate calibration was theoretically and experimentally investigated in accumulation leak detection with helium mass spectrometer at normal pressure.The analyzed and calibrated results show that the three variables all have a major impact.To be specific,the calibrated leakage-rate increases linearly with an increasing amount of helium and decreases with an increased chamber volume ;in a practical chamber volume of 30-100m^3,the calibrated leakage-rate steadily varies below 10^-9order.With a realistic spacecraft leakage-rate below 1×10^-4Pa·m^3/s being calibrated within lh,the discrepancy between them was estimated to be less than 30%.We suggest that the calibration precision may be considerablly improved by shorting calibration time and with more uniform helium distribution.

关 键 词：氦质谱检漏 漏率标定 氦气量 收集室 

分 类 号：B774[哲学宗教—外国哲学] TH813[机械工程—仪器科学与技术]