【摘要】 为了消除光束倾角带来的不确定性，本文建立了一种双路偏振式激光多普勒测速系统。该系统使用双光束双探头结构来探测物体的运动信息。首先，通过转动实验精确获得双光束间的夹角大小，对于任意光束倾角，本文采用双探头装置收集运动物体表面的散射光束，结合双路偏振式光路结构，得到两路干涉信号的多普勒频移。然后，创新性采用了细化分帧算法对两路干涉信号进行实时解调，通过两路速度分量的合成得到物体真实速度。实验结果表明：速度在10 mm/min～1 500 mm/min范围内，测量值与理论值之间的平均误差可以达到1%～5%。在非平稳运动过程中，通过细化分帧算法修正后的v-t图像RMSE均值为1.19 mm/min。该系统结构满足速度测量的稳定可靠、精度高、抗干扰能力强等要求。更多还原

【Abstract】 In order to eliminate the uncertainty caused by the inclination of a beam, a dual polarization laser Doppler velocimetry system is established. We use a structure with two beams and two probes to detect the motion of the object. Firstly, the angle between the two beams is obtained by a calibration experiment. For any beam inclination, the scattered beam on the surface of a moving object is collected by a dual-probe device, and the Doppler shift of the two interference signals is obtained by combining the dual polarization optical path structure. Then, the refined framing algorithm is applied to demodulate the two interference signals in real time. The real speed of the object is obtained through the synthesis of the two speed components.The experimental results show that the average deviation between the measured value and the theoretical value can reach 1%-5% when the speed is within the range of 10 mm/min～1 500 mm/min. In the process of non-stationary motion, the mean RMSE of the v-t image corrected by the refining frame segmentation algorithm is 1.19 mm/min. The system’s structure meets the requirements of stability and reliability, high precision and strong anti-interference ability in speed measurement.更多还原