Sun Junhua, Zhang Jie, Liu Zhen, Zhang Guangjun
Key Laboratory of Precision Opt-mechatronics Technology, Ministry of Education, Beihang University, Beijing, China.
Appl Opt. 2013 Aug 10;52(23):5676-85. doi: 10.1364/AO.52.005676.
It is currently difficult to achieve good real-time dynamic angle measurements with high accuracy and large ranges. In this paper, a photoelectric measurement method for dynamic angles based on three laser displacement sensors (LDSs) is proposed. Offline, a dynamic angle vision measurement model is established, and the system is calibrated by using a planar target moved by a 2D moving platform. In the course of measurement, three laser beams emitted from three LDSs are projected onto a rotating plane, and three noncollinear points are acquired synchronously; then the rotation angle is calculated in real time. Simulations verify the feasibility of the method theoretically. Experimental results demonstrate that the method achieves measurement accuracies of 0.008° and 0.046° under quasi-static condition of 80°/s and highly dynamic condition of 1000°/s within the measurement range of about ±40°, respectively.
目前，要实现高精度、大范围的良好实时动态角度测量是很困难的。本文提出了一种基于三个激光位移传感器（LDS）的动态角度光电测量方法。离线时，建立动态角度视觉测量模型，并使用二维移动平台移动的平面目标对系统进行校准。在测量过程中，从三个LDS发射的三束激光束投射到一个旋转平面上，并同步获取三个非共线点；然后实时计算旋转角度。仿真从理论上验证了该方法的可行性。实验结果表明，该方法在约±40°的测量范围内，在80°/s的准静态条件和1000°/s的高动态条件下，测量精度分别达到0.008°和0.046°。
