钨极氩弧焊熔池表面高度测量系统纵向标定

研究基于傅里叶变换轮廓术的钨极氩弧焊熔池表面高度测量系统的纵向标定方法,将一正弦光栅投向置于熔池位置的标定板,用一维精密移动装置带动平板纵向移动,构造不同的已知高度分布.4f系统把标定板上的光栅条纹转移到输出面,在输出面放置白屏接收输出图像,CCD拍摄屏上的光栅条纹,通过数字图像处理求出像素平面每点的位相值,确定系统的位相高度映射关系,对测量系统进行纵向标定并进行焊接实验,初步获得了熔池的表面高度分布.

Longitudinal calibration of welding pool altitude measuring system for gas tungsten arc welding

A longitudinal calibration method was proposed for welding pool altitude measuring system for tungsten inert gas welding,based on Fourier transform profilometry (FTP).A sinusoidal grating was projected to the calibration panel located in the welding pool,and the panel was longitudinally driven by a one-dimensional precise moving apparatus to construct diverse altitudes.A 4f optical system transferred the grating fringes on calibration panel to the output plane,on which a white screen was placed to receive the output image and grating fringes captured by a CCD.The phase value at each point on pixel plane was obtained by digital image processing,and then the relationship between phase value and welding pool altitude was determined.The distribution of welding pool surface height was acquired through the longitudinal calibration of measuring system and subsequent welding experiments.