Application of principal component analysis in vacuum diagnosis of vacuum interrupter based on laser spectroscopy

Vacuum degree online detection of vacuum interrupter has been investigated for more than 50 years. But there still no suitable technique can be used in practical application. Laser induced plasma technique is applied to vacuum degree online detection in this paper. The laser induced plasma signal of Cu and ambient gas elements are investigated from 10
^-3
Pa to 1 atm under laboratory condition. The change rules of laser induced plasma signal varying with pressure are obtained. Furthermore, principal component analysis is used to analyse the aggregation under different pressure. Research results indicated the ambient gas elements are changed with pressure monotonously. And the laser induced plasma signals under same pressure present good aggregation in phase space. A prospective method is proposed to solve vacuum degree online detection of vacuum interrupter in this paper.