等离子体温度分布测量方法的研究

Study on method of measuring temperature distribution of plasma

测量激光深熔焊接小孔的温度分布是研究小孔形成机理的重要手段之一。为了获得非对称情况下的等离子体温度的二维分布,通过变量分离方法将光谱测量的一维信息分离为对称和非对称两部分,在阿贝尔变换的基础上,利用数值方法计算出对称部分的平面二维分布,从而获得非对称情况下的平面二维分布。通过假想的非对称分布函数进行了模拟计算和误差分析,结果证明算法的整体误差小,对研究激光焊接形成小孔的机理具有十分重要的意义。

Measuring temperature distribution of laser penetration welding keyhole is one of the important ways to study the foundational theory of keyhole. The object is to get the 2-D temperature distribution of plasma in non-symmetry case, dividing one dimension spectrum information into symmetry and non-symmetry part by variable separation approach, computing plane 2-D distribution of antimere by numerical method based on Abel transform, the plane 2-D distribution in non symmetry case can be obtained. A hypothetical function is calculated with this method, error analysis proves that it describes real distribution for small global error accurately. It is important for the study of the foundational theory of the laser penetration welding keyhole.