双路偏振结构的多普勒测速系统 -

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双路偏振结构的多普勒测速系统

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，主要从事光纤传感等方面的研究。E-mail：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，主要从事于相干探测与光纤传感装置的研究。E-mail：slzhen@ahu.edu.cn

中图分类号:TN29
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出版历程
- 收稿日期:2022-10-11
- 录用日期:2023-01-18
- 修回日期:2022-11-11
- 网络出版日期:2023-03-08

Laser Doppler velocimetry with a dual polarization structure

TAO Shan-jing^{1, 2,},
ZHEN Sheng-lai^{1, 2,,},
FANG Jian^{1, 2},
CHEN Xin^{1, 2},
LV Tao³,
YU Ben-Li^{1, 2}

1.
Key-Laboratory of Opto-Electronic Information Acquisiton and Manipulation, Ministry of Education, Anhui University, Hefei 230601, China
2.
Information Materials and Intelligent Sensing-Laboratory of Anhui Province, Anhui University, Hefei 230601, China
3.
Anhui Zhibo Optoelectronic Technology Co., Ltd, Hefei 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~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。该系统结构满足速度测量的稳定可靠、精度高、抗干扰能力强等要求。
- 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 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~1500 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.
- Laser Doppler Velocimetry(LDV)/
- dual polarization/
- refine framing/
- double probe

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图 1 多普勒测速原理示意图

Figure 1.Schematic diagram of laser doppler velocimetry principle

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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信号采集图。（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.Signal acquisition diagram. (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 picture of the optical path

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图 7（a）1路和（b）2路原始信号图

Figure 7.Original signal diagrams of (a) channel 1 and (b) channel 2

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图 8（a）1路和（b）2路信号的频谱图

Figure 8.Spectrum diagrams of signals in (a) channel 1 and (b) channel 2

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图 9（a） FFT 对数振幅谱及（b）细化分帧对数振幅谱

Figure 9.(a) FFT logarithmic amplitude spectrum and (b) refine framing logarithmic amplitude spectrum

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图 10不同分帧下的时频图。（a）N=5 K；（b）N=2 K；（c）N=1 K；（d）N=0.5 K；（e）N=0.25 K；（f）N=0.2 K；

Figure 10.Time frequency diagrams under different framings. (a)N=5 K; (b)N=2 K; (c)N=1 K; (d)N=0.5 K; (e)N=0.25 K; (f)N=0.2 K；

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图 11光束夹角的变化情况

Figure 11.Change in beam’s angle

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图 12（a）1路和（b）2路速度分量与（c）合速度

Figure 12.Speed component of (a) channel 1 and (b) channel 2 and (c) the combined speed

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图 13（a）细化分帧解调后和（b）STFT解调后的v-t图

Figure 13.Detailed v-t diagram after (a) frame dividing demodulation and (b) STFT demodulation

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图 14不同倾角下的速度测量值

Figure 14.Velocity measurement values at different beam angles

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图 15加速过程中（a）1路，（b）2 路和（c）合速度的v-t图像

Figure 15.v-t diagram of (a) channel 1; (b) channel 2 and (c) the combined speed during acceleration

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图 16（a）未经算法修正和（b）算法修正后结果

Figure 16.v-t diagram (a) before and (b) after algorithm modification

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图 17滤波前后的均方根误差对比图

Figure 17.Comparison of RMSE before and after filtering

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表 1速度测量的结果对比

Table 1.Comparison results of speed measurement

线性位移平台速度 (mm/min)	细化分帧				STFT
线性位移平台速度 (mm/min)	APD1 (Hz)	APD2 (Hz)	和速度 (mm/min)	偏差 (%)	APD1 (Hz)	APD2 (Hz)	和速度 (mm/min)	偏差 (%)
1500	13524	11915	1482	1.20	13478	11959	1414	5.73
1200	10827	9550	1215	1.25	10878	9661	1134	5.50
1000	9186	8086	1014	1.40	9074	8060	946	5.40
800	7309	6427	810	1.27	7305	6523	726	9.25
600	5490	4824	611	1.88	5417	4819	558	7.00

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