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Optimized all-fiber laser Doppler velocimeter with large depth of field

机译：优化的全光纤激光多普勒速度计，具有大景深

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摘要

Due to the low spatial coupling efficiency of optical fiber and large energy loss, the depth of field in the all-fiber laser Doppler velocimeter is short, and the focus needs to be adjusted before measurement, so it is impossible to continuously measure the velocity of object moving along the optical axis. To solve this problem, an all-fiber Doppler velocimeter based on the Mach-Zehnder interferometer structure is designed, also, in the optical antenna section, C-lens is used to change the divergence angle of the light coming out of the optical fiber. The optimized design achieves the detection with large depth of field. The experiment is designed to verify the intensity of the echo signal, signal-to-noise ratio (SNR) and the speed accuracy of the velocimeter taken in different depths of field. The test results show that the depth of field in this system is superior to 25 m. The SNR is stable around 16 dB with small fluctuation in the range of depth of field, and the speed accuracy is better than +/- 0.1 m/s.
机译：由于光纤的低空间耦合效率和大的能量损失，全光纤激光多普勒速度计中的场景短，并且需要在测量之前调整焦点，因此不可能持续测量速度沿光轴移动的物体。为了解决这个问题，设计了一种基于Mach-Zehnder干涉仪结构的全纤维多普勒速度计，而且还设计了C透镜来改变光纤出来的光的发散角。优化的设计实现了大景深的检测。该实验旨在验证回波信号的强度，信噪比（SNR）和不同深度拍摄的Velocimeter的速度精度。测试结果表明，该系统中的景深优于25米。 SNR稳定在16 dB约为16 dB，在景深范围内的小波动，速度精度优于+/- 0.1米/秒。

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  • 来源
    《Optical fiber technology》 |2020年第12期|102333.1-102333.6|共6页
  • 作者

    Hao GeYang; Cui Ying; Yang Yucheng; Iv Xiaopeng; Wu Guojun;

  • 作者单位

    Chinese Acad Sci Xian Inst Opt & Precis Mech Fazhan St Xian 710119 Peoples R China;

    Engn Univ PAP Coll Equipment Management & Support Wujing St Xian 710086 Peoples R China;

    Chinese Acad Sci Xian Inst Opt & Precis Mech Fazhan St Xian 710119 Peoples R China;

    Chinese Acad Sci Xian Inst Opt & Precis Mech Fazhan St Xian 710119 Peoples R China;

    Chinese Acad Sci Xian Inst Opt & Precis Mech Fazhan St Xian 710119 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Laser Doppler velocimeter; Optical fiber sensing; Optical precision measurement; Depth of field;

    机译：激光多普勒速度计;光纤感测;光学精密测量;景深;

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