基于激光扫描钢管直径在线检测研究

摘要

为了实现对红热钢管直径在线检测的目的,采用了数字式激光扫描的方法.该方法基于模-数变换的原理,用电机带动四面体棱镜旋转,实现激光双光束同时对钢管直径和光栅的扫描,用光栅的栅距度量钢管直径.其创新之处是采用激光双光束同时扫描方式,克服了电机转速不稳带来的误差.用标准件做了原理实验测试,获得令人满意的结果,最大测量误差为±20 μm.使用此方法进行钢管直径在线检测具有实用性.%In order to achieve on-line detection of red-hot pipe diameter, a digital laser scanning method was used. The method was based on analog-digital conversion, used a motor driven tetrahedron prism rotating to achieve double-beam laser on the pipe diameter and grating while scanning at the same time, adopted grating pitch as a ruler to measure the diameter of the pipe. Using of this double-beam laser scanning, the error caused by the motor speed instability was overcame. The satisfactory results can be obtained by experimental test, the maximum measurement error is . A conclusion that on-line detection of pipe is practical.