Optical triangulation method was used to measure geometrical dimension parameters by laser displacement sensor scanning . both laser displacement sensor scanning and image processing technology were used to measure failure parameters . the detecting results of parameters of wheel set met the requirements of vehicle maintaining 轮对尺寸参数是利用基于激光三角法测量原理的激光位移传感器来检测，踏面缺陷参数的测量是利用激光位移传感器和图像处理相结合的方法来检测，其测量精度达到车辆段修要求的技术指标。
