Research on the accumulation leak detection method of helium mass spectrometry based on low vacuum

Speaker:
Wang, Yong; Beijing Institute of Spacecraft Environment Engineering; China

Authors:
Wang, Y.; Beijing Institute of Spacecraft Environment Engineering; China

ID: ECNDT-0426-2018
Download: PDF
Session: Aerospace 2
Room: G1
Date: 2018-06-12
Time: 13:50 - 14:10

Nowadays, the non-vacuum accumulation leak detection method and vacuum leak detection method are widely used for testing the total leakage rate of spacecrafts, such as the hermetic cabin. The vacuum leak detection method is often used for Russian spacecrafts. But the above two kinds of method are both used for American spacecrafts. Generally speaking, the non-vacuum accumulation leak detection method is used for spacecrafts which have low leakage rate demand, such as satellites and Node 1 of International Space Station. While the vacuum leak detection method is used for these spacecrafts which have high leakage rate demand, such as Airlock Module and Laboratory Module of ISS. In China, the non-vacuum accumulation leak detection method is often used in order to save the leak detection cost. As we all know, the method of non-vacuum accumulation leak detection has advantages of low construction cost, simple operation, and so on. But its leak detection sensitivity is low, and test period is long, generally more than 24 hours. While the method of vacuum leak detection has advantages of high leak detection sensitivity, short test period, but its construction cost is high, and operation is relatively complicated. Therefore, it is necessary to study a kind of accumulation leak detection method of helium mass spectrometry based on low vacuum, in order to improve the leak detection sensitivity while reduce the construction cost as much as possible. In this paper, the feasibility of accumulation leak detection method of helium mass spectrometry based on low vacuum was studied from theoretical aspect firstly. Secondly, the optimum vacuum degree of leak detection, repeatability of experiment results and leak detection sensitivity had been tested. The results show that the accumulation leak detection method of helium mass spectrometry based on low vacuum has a higher leak detection sensitivity and good repeatability.