Abstract
Leak testing is the major type of non destructive testing for spacecrafts and the sealing performance of the spacecraft is an important parameter to evaluate the quality of the spacecraft. So it is necessary to study the total leakage rate test of the spacecraft and its uncertainty evaluation. In this paper, the basic principle of the total leakage rate test of the spacecraft was analyzed firstly from the theoretical aspect. Secondly, the various influencing factors on the results of total leakage rate test had been systemically analyzed. Finally, through the uncertainty evaluation theory, the uncertainty components induced by these influencing factors were respectively quantified and combined. And the expanded uncertainty of the result of total leakage rate test was given.
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