3D temperature measurement of axially asymmetrical welding arc plasma by image reconstruction method

本研究的目的是测量轴向不对称焊接电弧等离子体的三维温度分布。这需要光谱方法、多向测量和带图像重建的层析成像技术。首先，我们采用一台CCD相机的光学旋转系统，并通过评估合适的检测方向和数量对设备进行改进。用该系统测量了两个TIG电极的电弧。其次，构建了同时多向测量系统，对轴对称非稳态等离子体进行了测量。为了确保使用多探测器和干涉滤光片的正确测量，进行了包括通过滤光片调整中心波长的校准。利用倾斜焊炬可以对脉冲TIG电弧峰基极电流过渡时期的瞬态和非对称TIG电弧等离子体进行温度测量。

The aim of this study is measure the 3D temperature distribution of axially asymmetrical welding arc plasma. This requires spectroscopic method, multidirectional measurement and tomographic technique with image reconstruction. First, we employed the optical rotational system by one CCD camera and improved the equipment through the evaluation of the appropriate detection directions and numbers. Two TIG electrode arc was measured by this system. Second, we constructed the simultaneous and multidirectional measurement system was constructed to measure the axially asymmetric and non-steady state plasma. To ensure the correct measurement using multi detectors and the interference filters, the calibrations were conducted involving the adjustment of the central wavelength through the filter. We could perform the temperature measurement of the transient and asymmetrical TIG arc plasma such as in the transition period between the peak and base current of the pulsed TIG arc with tilted torch.