激光三角测距的一种实验标定方法

An Experimental Calibration Method for Laser Triangulation

提出了激光三角测距的一种实验标定方法。从实验中得到几组位移与深度的对应关系数据，对其取平均后用最小二乘法拟合出一条曲线，以此作为准标定线求出误差变化，对误差拟合后叠加到准标定线上就得到实际的标定曲线。

Laser triangulation along with benefits of noncontact, fast speed and high precision has been considered an effective method for 3Dconfiguration measurements. However, the imagespot displacement detected by CCD camera varies nonlinearly with the object profile depth and that will make the measurement difficult and somewhat inaccurate. An experimental calibration method is reported in this paper to reduce such effects. A screen used as an object is moved step by step along the direction of depth; a series of corresponding imagespot displacement data are collected by CCD camera and computer, and only a few data sets of these two quantities will give an experimentally fitted curve by least squares approximation. By regarding this curve as quasistandard, an error curve will be obtained by using those data sets not ever used. The final calibration curve can then be obtained just by superimposing the error curve on the quasistandard one. Our result shows that this method is more effective and accurate than those given in Ref.1.