激光焊接等离子体温度场测量及数据处理  

Data Process Method for Measurement of Plasma Plume Temperature Field in Deep Penetration Laser Welding

作　　者：陈根余[1] 赵智[1] 张屹[1] 张均[1] 

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,湖南长沙410082

出　　处：《中国激光》2008年第11期1778-1782,共5页Chinese Journal of Lasers

基　　金：国家863重点项目(2007AA042006);国家自然科学基金(50575070);教育部博士点基金新教师项目(20070532003)资助课题

摘　　要：应用光谱分析法测量激光焊接光致等离子体的温度场是激光焊接光致等离子体测量技术中的难点。采用基于快速傅里叶变换(FFT)和汉克耳变换的阿贝尔逆变换数值方法,研究出一种等离子体二维温度场分布的数据处理方法,并进行了计算精度分析。利用该数据处理方法,在取样点为41个的时候,得到的标准误差e大约为3.23×10-2。同时,进行了焊接试验,采用多通道光谱仪观测孔外光致等离子体,利用所提出的新方法实现了试验数据的处理,获得激光焊接孔外等离子体的温度场。计算得出的温度场呈相对于光束中心的四周低中间高的趋势。The temperature field of laser-induced plasma in laser welding is hard to be obtained by the spectral analysis method. By using fast Fourier transform （FFT） and Hankel inversion algorithms, a data processing method based on Abel inversion for measuring temperature distribution of plasma is studied. Meanwhile the precision in the process of the dada is analyzed. The standard error e was about 3.23 × 10^-2 at the number of dispersed points N of 41. The results show that the data process method can be very useful in the observation of the temperature filed of laser-induced plasma by using a multi-channel spectral analyzer. The temperature of plasma plume in the center area of laser beam appeared to be higher than the area near the laser beam.

关 键 词：激光加工 激光焊接 等离子体温度场测量 Abel逆变换 

分 类 号：TG115.31[金属学及工艺—物理冶金] TG441.7[金属学及工艺—金属学]