Parameter optimization of excited OH radical in multi-needle to plate negative DC corona discharge

In this paper, the emission spectra of OH radical (A2Σ+→X2Π, 0-0) were successfully measured by optical emission spectroscopy (OES) in multi-needle to plate negative DC corona discharge at atmospheric pressure in humid ambient air. The influences of discharge power, distance between needlepoint and plate, and relative humidity on production and productive rate of OH radical have been investigated. The optimized parameters of excited OH radical under present experimental conditions were obtained from the analysis of experimental results.