基于双路偏振结构的激光多普勒测速系统

陶善静; 甄胜来; 方健; 陈鑫; 吕韬; 俞本立

doi:10.37188/CO.2022-0211

基于双路偏振结构的激光多普勒测速系统

doi: 10.37188/CO.2022-0211

陶善静^{1, 2,},
甄胜来^{1, 2, ,},
方健^{1, 2},
陈鑫^{1, 2},
吕韬³,
俞本立^{1, 2}

1.
安徽大学光电信息获取与控制教育部重点实验室, 安徽合肥 230601
2.
安徽大学信息材料与智能感知安徽省实验室, 安徽合肥 230601
3.
安徽至博光电科技股份有限公司, 安徽合肥 230088

基金项目: 安徽省重点研究与开发计划（No. 202104a05020059）；安徽省优秀科研创新团队（No. 2022AH010003）

详细信息

作者简介:
陶善静（1996—），男，安徽庐江人，硕士研究生，2020 年于安徽理工大学获得学士学位，主要从事激光光纤传感等方面的研究。E-mali：tao758501@163.com

甄胜来（1977—），男，安徽固镇人，博士，教授，硕士生导师，合肥市拔尖人才，芬兰Aalto大学访问学者，2008 年于安徽大学获得博士学位，主要从事于激光相干探测与光纤传感装置的研究。E-mali：slzhen@ahu.edu.cn

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出版历程
- 收稿日期: 2022-10-11
- 录用日期: 2023-01-18
- 网络出版日期: 2023-03-08

Laser Doppler velocimetry based on dual polarization structure

TAO Shan-jing^{1, 2
,},
ZHEN Sheng-lai^{1, 2
, ,},
FANG Jian^{1, 2},
CHEN Xin^{1, 2},
LU Tao³,
YU BenLi^{1, 2}

1.
Key-Laboratory of Opto-Electronic Information Acquisiton and Manipulation, Ministry of Education, Anhui University, Hefei, Anhui 230601, China
2.
Information Materials and Intelligent Sensing-Laboratory of Anhui Province, Anhui University, Hefei, Anhui 230601, China
3.
Anhui Zhibo Optoelectronic Technology Co., Ltd, Hefei, Anhui 230088, China

Funds: Supported by Key Research and Development Plan of Anhui Province (No. 202104a05020059); Excellent scientific research and innovation team of Anhui province (No. 2022AH010003)

More Information

Corresponding author: slzhen@ahu.edu.cn

摘要

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。
- 激光多普勒测速 /
- 双路偏振 /
- 细化分帧 /
- 双探头
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.
- Laser Doppler Velocimetry(LDV) /
- dual polarization /
- refine framing /
- double probe

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图 1 激光多普勒测速原理图

Figure 1. Schematic diagram of laser doppler velocimetry

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图 2 光路系统图

Figure 2. Structure diagram of optical system

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图 3 光束与目标物之间的细节图

Figure 3. Detail between the beam and the target

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图 4 （a）原始信号；（b）200 k~280 k处采样点；（c）280 k~300 k处采样点；（d）原始信号频谱

Figure 4. (a) Original signal; (b) Sampling points at 200 k~280 k; (c) Sampling points at 280 k~300 k; (d) Original signal spectrum

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图 5 信号处理流程图

Figure 5. Signal processing flow chart

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图 6 光路实物图

Figure 6. Physical drawing of optical path

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图 7 两路原始信号图

Figure 7. Original signal diagram

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图 8 两路信号的频谱图

Figure 8. Spectrum diagram of two signals

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图 9 振幅谱对比图

Figure 9. Amplitude spectrum comparison diagram

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图 10 不同分帧下的时频图

Figure 10. Time frequency diagram under different framing

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图 11 单路速度分量与合速度

Figure 11. Single speed component and combined speed

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图 12 测量误差对比图

Figure 12. Comparison diagram of measurement error

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图 13 加速过程中的v-t图像

Figure 13. v-t diagram during acceleration

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图 14 算法修正后对比图

Figure 14. Comparison chart after algorithm modification

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图 15 均方根误差对比图

Figure 15. Comparison of RMSE

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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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