为了实现激光传感器测头可以根据现场条件来实时改变入射角度, 建立了结构可调的点激光测量系统。建立了相机的针孔模型, 利用张正友标定算法得到该相机模型的内部参数, 定义点激光测量系统中的光心角, 推导出利用像点坐标和相机内部参数实时求取光心角公式。建立了点激光测量系统的数学模型, 引入点激光测量系统的结构参数: 基线距和基准角, 利用零平面和两个基准面标定系统结构参数。利用标定得到的系统结构参数进行实时的逆向工程在线测量。实验结果表明: 测量系统量程为75mm时, 该标定算法最大标定误差≤0.02mm, 点激光测量系统的测量误差≤0.06mm, 达到精密测量的要求。

In order to make dot laser measuring system realize precision measurement. The structure-adjustable dot laser measuring system is established. Camera’s pin-hole imaging model is used. The intrinsic camera parameters of this model are got with Zhang’s algorithm. “Optical center angle” in dot laser measure system is defined and the formula which can calculate the “optical center angle” with intrinsic camera parameters that have been got firstly and coordinates of laser spot is given. The mathematical model of dot laser measure system is established, and “baseline length” and “base angle” which are called structure parameters of the system are introduced. Method to calculate the structure parameters is given. Dot laser measure system does on-line measurement with the result of dot laser measuring system calibration. Experiment results show: system’s measurement range is 75mm and this calibration algorithm’s maximum error is no more than 0.02mm and dot laser measure system’s maximum error is below 0.06mm. This calibration algorithm meets the precision measurement requirements.