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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

陶善静, 甄胜来, 方健, 陈鑫, 吕韬, 俞本立. 基于双路偏振结构的激光多普勒测速系统[J]. 中国光学(中英文). 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. 基于双路偏振结构的激光多普勒测速系统[J]. 中国光学(中英文). doi: 10.37188/CO.2022-0211
TAO Shan-jing, ZHEN Sheng-lai, FANG Jian, CHEN Xin, LU Tao, YU BenLi. Laser Doppler velocimetry based on dual polarization structure[J]. Chinese Optics. doi: 10.37188/CO.2022-0211
Citation: TAO Shan-jing, ZHEN Sheng-lai, FANG Jian, CHEN Xin, LU Tao, YU BenLi. Laser Doppler velocimetry based on dual polarization structure[J]. Chinese Optics. 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
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

Laser Doppler velocimetry based on 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。

     

  • 图 1  激光多普勒测速原理图

    Figure 1.  Schematic diagram of laser doppler velocimetry

    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  (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

    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 drawing of optical path

    图 7  两路原始信号图

    Figure 7.  Original signal diagram

    图 8  两路信号的频谱图

    Figure 8.  Spectrum diagram of two signals

    图 9  振幅谱对比图

    Figure 9.  Amplitude spectrum comparison diagram

    图 10  不同分帧下的时频图

    Figure 10.  Time frequency diagram under different framing

    图 11  单路速度分量与合速度

    Figure 11.  Single speed component and combined speed

    图 12  测量误差对比图

    Figure 12.  Comparison diagram of measurement error

    图 13  加速过程中的v-t图像

    Figure 13.  v-t diagram during acceleration

    图 14  算法修正后对比图

    Figure 14.  Comparison chart after algorithm modification

    图 15  均方根误差对比图

    Figure 15.  Comparison of RMSE

    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
    (%)
    11500135241197514344.1
    2120010827965011345.4
    310009186808610141.4
    4800730965377286.9
    5600549049045516.2
    6400366232593775.9
    7200186316481990.5
    8100914813955.2
    950459409476.1
    1010958410.21.7
    下载: 导出CSV
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  • 收稿日期:  2022-10-11
  • 录用日期:  2023-01-18
  • 网络出版日期:  2023-03-08

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