A Method of Leak Detection for Spacecraft on-orbit based on Acoustic Emission

With the development of spaceflight activity of human, the number of space debris has increased dramatically. Spacecraft will be impacted by large amount of small debris in space during flight. In order to detect the gas leak in time, a new method of leak detection for spacecraft on-orbit based on acoustic emission is important. Gas leak detection technology based on the acoustic emission in the field of manned space flight has been successfully applied. In this paper, some of the latest research is introduced giving some reference to leak detection for spacecraft on-orbit. Gas leak produces a large number of acoustic emission signal, and the frequency of the signal covers multiple frequency bands. The smaller the leakage is, the smaller the signal amplitude is, but the more high frequency signal component is contained. In normalized energy distribution map, different aperture leakage acoustic emission signals have a certain similarity, but have obvious difference with pump noise signal whose frequency hand is mainly below 20 kHz.