The Technique of Multi-System Leak Detection for Spacecraft with Quadrupole Mass Spectrometer

摘要

As the development of spacecraft, the multi-system leak detection is needed. The multi-system leak detector on spacecraft by QMS (quadrupole mass spectrometer) has been developed and it has been used in the new spacecraft successfully. The problem of repeat and reliability of QMS in long time is avoided. The QMS calibration is solved by injecting the quantitative calibration gases into the cumulative vessel. In the atmosphere, the minimal He concentration can be test is 13×10~(-9), CF4 concentration is 10×10~(-9), Ne concentration is 3×10~(-6), SF_6 concentration is 0.3×10~(-9), Kr concentration is 10×10~(-9). For the collection chamber with 100 m~3 volume, in 24 hours, the minimal He leak rate can be test is 1.5×10~(-6) Pa·m~3/s, CF_4 leak rate is 1.1×10~(-6) Pa·m~3/s, Ne leak rate is 3.5×10~(-5) Pa·m~3/s, SF_6 leak rate is 3×10~(-8) Pa·m~3/s, Kr leak rate is 1.1×10~(-6) Pa·m~3/s.