利用激光三角测距法提高三维面型检测精度的方法

本文首先介绍了根据激光三角测距原理并采用片光照明、面阵ＣＣＤ接收的三维面形检测原理，其优点在于物面相对于测量头仅需一个方向移动即可完成二维扫描，使测量系统结构简单、便于控制。其次分析了影响其测量精度的几个主要因素，即散斑噪声、接收器件本身的分辨率、投影片光束的宽度与稳定性。散斑噪声造成了投影光斑的抖动，ＣＣＤ的分辨率限制了测量系统的分辨率，而片光束的质量影响着ＣＣＤ光敏面上像斑的准确定位。针对其各自的特点给出了相应的解决途径。

Method for improving presision of 3D sensor based on laser triangulation

A practical 3D sensor based on laser triangulation is introduced in this paper. The advantage using sheet beam and face array CCD camera is that the 2D scanning can be finished by moving object relative to the sensor only in one direction, so that the measuring system is simplified and can be conveniently operated. Three factors, laser speckle、 CCD resolution and the width and stability of sheet beam, which influent and limit the precision of measurement, are discussed. The speckle noise could induce a “dancing” of the projective light spot. CCDs revolution limits the one of measuring system. And the quality of sheet beam affect image spot locating on CCD ship. Some ways to overcome these problems are present and the experiment results show these ways are practice.