Low atmospheric pressure plasma has an important application prospect in engineering dielectric modification field, and porous dielectric are attracting more attention. However, the generation mechanism of discharge plasma in porous dielectric remains to be explored. To study the characteristics and the generation mechanism of porous dielectric discharge, this paper analyzed the characteristic parameters of porous discharge by spectroscopic diagnosis. This study designed a plasma experiment device, and applied DC high voltage source to produce porous discharge in low atmospheric pressure. By spectroscopic diagnosis, this paper measured the spectral characteristics of gas discharge in porous dielectric. And determined parameters such as electron density and electron temperature by the method of relative intensities of spectral lines. It is shown that compared with the classical gas discharge, the electron density and electron temperature of the porous discharge are significantly reduced, regardless of the type of gas, and porous dielectric inhibit the formation of electron penetration channels. This study has theoretical significance for the application of low atmospheric pressure plasma.

porous dielectric,gas discharge,spectroscopic diagnosis,electron density,electron temperature