焊接电弧三维电子密度的测量对于焊接质量控制具有重要意义, 通过光谱仪采集电弧弦方向特征谱线轮廓, 利用多项式拟合对径向采集数据进行降噪及平滑处理, 通过Abel逆变换法重新构建径向光谱发射系数谱线轮廓, 采用傅里叶变换从重建光谱轮廓中分离出Lorentz线形, 获得Stark展宽, 最终计算了TIG焊电弧等离子体电子密度的三维空间分布。

The three-dimensional electron density is very important for welding arc quality control. In the present paper, Side-on characteristic line profile was collected by a spectrometer, and the lateral experimental data were approximated by a polynomial fitting. By applying an Abel inversion technique, the authors obtained the radial intensity distribution at each wavelength and thus constructed a profile for the radial positions. The Fourier transform was used to separate the Lorentz linear from the spectrum reconstructed, thus got the accurate Stark width. And we calculated the electronic density three-dimensional distribution of the TIG welding arc plasma.