基于双光源干涉的PDV数据补偿方法

张敏; 杨军; 史国凯; 姜万春; 王昭; 惠海龙

doi:10.11858/gywlxb.20180659

基于双光源干涉的PDV数据补偿方法

doi: 10.11858/gywlxb.20180659

西北核技术研究所强动载与效应重点实验室，陕西西安　710024

详细信息

作者简介:
张　敏（1981－），男，硕士，工程师，主要从事力学信号获取与信息处理研究. E-mail：zhangmin@nint.ac.cn

中图分类号: O384
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出版历程
- 收稿日期: 2018-10-15
- 修回日期: 2018-11-08

A Compensation Method of Photonic Doppler Velocimeter Based on Two Laser Sources

Laboratory of Intense Dynamic Loading and Effect, Northwest Institute of Nuclear Technology, Xi’an 710024, China

摘要

摘要: 针对结构动态响应测试中的大量程负向速度测量问题，设计了基于双光源干涉的光纤速度干涉仪（PDV）测试系统，与单光源PDV系统相比，大幅拓宽了负向测速范围。但在爆炸实验中发现，由于光源波长波动产生了位移基线漂移和振荡问题。为此，引入一路参考反射镜，产生双光源干涉本底信号，用于补偿位移基线，并研究了数据补偿算法。经实验验证，补偿后的位移基线漂移量为微米级，双光源模式及补偿方法可行且有效。
- 光子多普勒速度测量技术 /
- 时频变换 /
- 数据补偿 /
- 速度测量
Abstract: In order to solve the problem of large range negative velocity measurement in dynamic response measurement of structure, a photonic Doppler velocimetry (PDV) measurement system based on two laser sources is designed. Compared with the single laser source PDV system based on acoustic optical modulator, the range of negative velocity measurement is greatly improved. However, it is found in the explosion experiment that the displacement baseline drift and oscillation are caused by the wavelength fluctuation of the laser source. For this reason, one reference reflector is introduced to generate the background signal which is used to compensate the displacement. Then, the data compensation algorithm is studied. The experimental results show that the displacement baseline drift after compensation is in the order of micron. PDV based on two laser sources and the compensation method are feasible and effective.
- photonic Doppler velocimetry /
- time-frequency transform /
- data compensation /
- velocity measurement

HTML全文

图 1 旁轴式外差结构PDV（1.激光器，2.分束器，3.移频器，4.衰减器，5.环形器，6.合束器，7.探头，8.被测物，9.探测器，10.示波器）

Figure 1. PDV using heterodyne techniques (1. Laser; 2. Splitter; 3. Modulator; 4. Attenuator; 5. Circulator; 6. Combiner; 7. Probe; 8. Target; 9. Detector; 10. Oscilloscope)

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图 2 双光源模式PDV（1.信号激光器，2.参考激光器，3.环形器，4.合束器，5.探头，6.被测物，7.探测器，8.示波器）

Figure 2. PDV with two laser sources (1. Signal laser; 2. Reference laser; 3. Circulator; 4. Combiner; 5. Probe; 6. Target; 7. Detector; 8. Oscilloscope)

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图 3 补偿通道示意图（1.信号激光器，2.参考激光器，3.环形器，4.合束器，5.反射镜，6.探测器，7.示波器）

Figure 3. Schematic diagram of compensation channel (1. Signal laser; 2. Reference laser; 3. Circulator; 4. Combiner; 5. Reflector; 6. Detector; 7. Oscilloscope)

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图 4 位移漂移现象及补偿结果

Figure 4. Displacement baseline drift and compensation result

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图 5 补偿前的位移值

Figure 5. Displacement before compensation

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图 6 补偿后的位移值

Figure 6. Displacement after compensation

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图 7 速度结果

Figure 7. Velocity result

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参考文献(12)

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