用于焊接过程控制的激光扫描式传感器的研究
A STUDY ON THE LASER SCANNING SENSOR FOR WELDING PROCESS CONTROL
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摘要: 传感器是焊接过程视觉控制的重要因素之一.焊接过程控制一般分为两类:第一类是关于位置的控制;第二类是关于焊接工艺参数的控制.本文提出一种传感方法,它主要包括光学系统,信号接受器和数据处理器.由于电弧光的强烈干扰,一般的摄象机很难直接作为传感器.但是应用扫描式激光传感器,其结构紧凑且可以抑制电弧光的影响.为提高信号处理速度,本传感方法中采用了一种新型的“位置传感元件”(PSD),它不用象普通摄象机那样的扫描电路,因而速度很快.试验说明这种传感方法非常适用于机器人焊接的焊缝跟踪控制.除此,它还能识别焊接接头的几何形状与尺寸等信息.因此,它是一种有效的且很有前途的传感方法.Abstract: This paper presents a sensing system which consists of an optical, signal receiver and data processor.Using laser beam and its mechanical scanning keep the sensing system more compact and stable from arclight disturbance. A new optical receiver, position sensor device(PSD), is utilized in the sensing method.Unlike conventional TV electrical scanning mode, it does not need any electrical scanning circuits so as toincrease the speed of processing signal. Experiment results.