物面倾斜对激光三角法测量误差影响的分析研究

针对传统方法测量位移时出现的分辨率低、准确性差、操作不便捷等问题，提出采用激光三角法非接触测量物体位移，而物面倾斜是影响测量精度的主要因素。通过分析激光三角测量的基本原理，基于朗伯定律，利用光散射原理研究了物面倾斜角与光能质心之间的关系；由沙氏条件下的几何光路关系，推导得到测量误差与倾斜角之间的关系式；通过实验数据对激光扫描测量产生的误差进行分析，验证理论推导的结果，在测量中具有避免出现粗大误差的实际意义。

Analysis on the Object Surface Tilt Effect on the Measurement Error of Laser Triangulation Method

Aiming at lack of resolution, poor accuracy, not convenient operation etc. which appeared in the traditional methods of displacement measurement, in this paper, laser triangulation non-contact type measuring displacement was proposed,the inclination of measured surface had influenced on the accuracy. Based on the Lambert Law,the relation-ship between the tilt angle of surface and light centroid was studied on through the analysis of basic principles of the laser triangulation by using light scattering theory. By the geometric light path relationship of scheimpflug’s condition, the relation between the measurement error and the tilt angle could be obtained. The laser scanning measurement error was analyzed by experimental data and the theoretical results were verified. It has practical significance that gross errors were avoided in the measurement.