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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,对于任意光束倾角下,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~1500 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。该系统结构满足了对速度测量时稳定可靠、精度高、抗干扰能力强等要求。
Abstract:In order to eliminate the uncertainty caused by the inclination of the beam, a dual polarization laser Doppler velocimetry system is established in this paper. The system uses a dual beam dual probe structure to detect the motion information of the object. Firstly, the included angle of the two beams is accurately obtained through the rotation experiment. For any beam inclination, the dual probe device is used to collect the scattered beam from the moving object surface, and the Doppler frequency shift of the two interference signals is obtained by combining the dual polarization optical path structure. Then, the refined framing algorithm is innovated to demodulate the two interference signals in real time, and the real speed of the object is obtained by synthesizing the two speed components. The experimental results show that the average error between the measured value and the theoretical value can reach 1% ~ 5% when the speed is within the range of 10 mm/min ~ 1500 mm/min. In the process of non-stationary motion, the RMSE average of V-T image corrected by thinning and framing algorithm is 1.19mm/min. The structure of the system meets the requirements of stability and reliability, high accuracy and strong anti-interference ability in speed measurement.
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Key words:
- Laser Doppler Velocimetry(LDV) /
- dual polarization /
- refine framing /
- double probe
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表 1 速度测量的结果对比
Table 1. Comparison results of speed measurement
次数 平台速度
(mm/min)APD1路频移
(Hz)APD2路频移
(Hz)测量速度
(mm/min)相对误差
(%)1 1500 13524 11975 1434 4.1 2 1200 10827 9650 1134 5.4 3 1000 9186 8086 1014 1.4 4 800 7309 6537 728 6.9 5 600 5490 4904 551 6.2 6 400 3662 3259 377 5.9 7 200 1863 1648 199 0.5 8 100 914 813 95 5.2 9 50 459 409 47 6.1 10 10 95 84 10.2 1.7 -
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