仪器展宽对大气压等离子体电子密度测量的影响

实验使用两台不同的单色仪,采用光谱线型法测量了大气压氩气介质阻挡放电中的电子密度.诊断结果表明,由于不同的单色仪其仪器加宽不同,仪器加宽对总的光谱线型有较大影响.通过考虑等离子体中的各种加宽机制,采用卷积和反卷积的方法对氩原子发射谱线线型进行了分析,从整个光谱线型中分离出Stark线型,排除了仪器加宽对最终诊断结果的影响.从而最终测量了大气压氩气介质阻挡放电中的电子密度.测量得到在大气压氩气介质阻挡放电中单个放电丝存在时,电子温度为10000K时,电子密度约为3.05-3.26×1021 m-3.此方法不仅可以应用在大气压介质阻挡放电中,还可以用于测量其它大气压等离子体电子密度.

The influence of instrument broadening on the measurement electron density of atmospheric pressure plasmas

The electron density of DBD in atmospheric pressure argon is measured using two different monochromators by the spectral line profile method. The results show the instrument broadening have great influence on the total experimental spectral profiles thanks to the instrument broadening of different monochromators. Considering various broadening mechanisms of plasmas, the Stark broadened profile is separated from Spectral lines of experimental spectral profiles of neutral argon atoms by convolution and deconvolution. So it is slightly influence on the final result when the Stark broadening of argon atom is separated from the total experimental spectral profiles. The results show that the electron density in single filamentary micro-discharge at atmospheric pressure argon is 3.05-3.26 1021 m-3 if the electron temperature is 10000K. We present a method for measurement of electron density in atmospheric pressure dielectric barrier discharge and other plasmas in atmospheric pressure.