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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

陶善静, 甄胜来, 方健, 陈鑫, 吕韬, 俞本立. 双路偏振结构的激光多普勒测速系统[J]. 中国光学(中英文), 2023, 16(4): 753-764. doi: 10.37188/CO.2022-0211
引用本文: 陶善静, 甄胜来, 方健, 陈鑫, 吕韬, 俞本立. 双路偏振结构的激光多普勒测速系统[J]. 中国光学(中英文), 2023, 16(4): 753-764. doi: 10.37188/CO.2022-0211
TAO Shan-jing, ZHEN Sheng-lai, FANG Jian, CHEN Xin, LV Tao, YU Ben-Li. Laser Doppler velocimetry with a dual polarization structure[J]. Chinese Optics, 2023, 16(4): 753-764. doi: 10.37188/CO.2022-0211
Citation: TAO Shan-jing, ZHEN Sheng-lai, FANG Jian, CHEN Xin, LV Tao, YU Ben-Li. Laser Doppler velocimetry with a dual polarization structure[J]. Chinese Optics, 2023, 16(4): 753-764. doi: 10.37188/CO.2022-0211

双路偏振结构的激光多普勒测速系统

doi: 10.37188/CO.2022-0211
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-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,主要从事于激光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

Laser Doppler velocimetry with a dual polarization structure

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
  • 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~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。

     

  • 图 1  激光多普勒测速原理示意图

    Figure 1.  Schematic diagram of laser doppler velocimetry principle

    图 2  光路系统图

    Figure 2.  Structure diagram of optical system

    图 3  光束与目标物之间的细节图

    Figure 3.  Detail between the beam and the target

    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

    图 5  信号处理流程图

    Figure 5.  Signal processing flow chart

    图 6  光路实物图

    Figure 6.  Physical picture of the optical path

    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

    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

    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

    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;

    图 11  光束夹角的变化情况

    Figure 11.  Change in beam’s angle

    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

    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

    图 14  不同倾角下的速度测量值

    Figure 14.  Velocity measurement values at different beam angles

    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

    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

    图 17  滤波前后的均方根误差对比图

    Figure 17.  Comparison of RMSE before and after filtering

    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
    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
    下载: 导出CSV
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  • 收稿日期:  2022-10-11
  • 修回日期:  2022-11-11
  • 录用日期:  2023-01-18
  • 网络出版日期:  2023-03-08

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