中文摘要：

在常压空气中,利用OES技术检测到负直流电晕放电等离子中激发态N原子发射光谱,并利用相对谱峰强度最大的674.5nm N原子激发跃迁谱线研究了相关空气参数和电参数对其相对密度的影响。结果表明,电离区内N原子相对密度随注入功率的升高呈增加趋势;随电极间距和相对湿度的增加,其相对密度逐渐减小;随N2流量增加,其相对密度呈先增加再减小趋势。在实验条件下,当针尖轴向距离r=1mm时,N原子相对密度出现最大值。

英文摘要：

The emission spectra of nitrogen（N） atom produced by multi-needle-to-plate negative corona discharge in air were detected successfully at one atmosphere,and the excited transition spectral line at 674.5 nm with maximum value of relative intensity was selected to investigate the influences of air and electrical parameters on N atom relative density.The results indicate that N atom relative density in ionization region increases with the increase in power;decreases with increasing discharge gap and relative humidity;and with the increase in N2 content,the relative density of N active atom firstly increases and then decreases.Under present experimental conditions,the maximum value of N atom relative density appears at the axial distance from needle point r=1 mm.