Frequency-shifted dual pulse modulation phase-sensitive optical time-domain reflectometer sensing technology

FAN Yingrui; WANG Yu; ZHANG Shuo; WANG Junhong; WANG Pengfei; LIU Xin; JIN Baoquan

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Frequency-shifted dual pulse modulation phase-sensitive optical time-domain reflectometer sensing technology

Optical Sensing and Measurement | 更新时间：2025-10-09

- Frequency-shifted dual pulse modulation phase-sensitive optical time-domain reflectometer sensing technology
- OPTICAL TECHNIQUE Vol. 51, Issue 4, Pages: 497-503(2025)
- 作者机构：
  
  1.太原理工大学物理与光电工程学院，山西太原 030024
  2.太原理工大学电子信息工程学院，山西太原 030024
  3.太原理工大学新型传感器与智能控制教育部重点实验室，太原 030024
- 作者简介：
- 基金信息：
- DOI：
  CLC： TH89;TN29
- Received：04 January 2025，
  
  Revised：2025-03-07，
  
  Published：20 July 2025
- 稿件说明：
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樊迎瑞,王宇,张硕等.移频双脉冲调制相位敏感光时域反射传感技术[J].光学技术,2025,51(04):497-503.

FAN Yingrui,WANG Yu,ZHANG Shuo,et al.Frequency-shifted dual pulse modulation phase-sensitive optical time-domain reflectometer sensing technology[J].OPTICAL TECHNIQUE,2025,51(04):497-503.
樊迎瑞,王宇,张硕等.移频双脉冲调制相位敏感光时域反射传感技术[J].光学技术,2025,51(04):497-503. DOI：

FAN Yingrui,WANG Yu,ZHANG Shuo,et al.Frequency-shifted dual pulse modulation phase-sensitive optical time-domain reflectometer sensing technology[J].OPTICAL TECHNIQUE,2025,51(04):497-503. DOI：

摘要

相位敏感光时域反射仪（Φ-OTDR）因多采用相干探测方式而需要极高的采样频率。为了降低系统采样频率，提出一种移频双脉冲调制直接探测Φ-OTDR系统，通过声光调制器时延变频控制产生频移量分别为79MHz和81MHz的移频双脉冲光，将瑞利散射信号调制到差频为2MHz的边带上，并结合外差解调技术，将系统采样频率降低至10MHz。采用马赫-曾德尔干涉结构验证了移频的有效性，并在10MHz采样频率下成功实现了200Hz、500Hz、1000Hz和2000Hz振动信号的精确解调。重复性实验中，线性拟合系数达到0.9989，验证了系统在低采样频率条件下振动信号解调的稳定性，为降低Φ-OTDR系统的硬件成本和数据处理量提供了有效的技术解决方案。

Abstract

Phase-sensitive optical time-domain reflectometer （Φ-OTDR） requires extremely high sampling frequency because it mostly adopts the coherent detection method. In order to reduce the sampling frequency of the system

a frequency-shifted dual pulse modulation direct detection Φ-OTDR system is proposed. The frequency-shifted dual pulse light with frequency shifts of 79 MHz and 81 MHz

respectively

was generated by the time-delay frequency conversion control of the acousto-optic modulator to modulate the Rayleigh backward scattering signal onto the sidebands with a heterodyne frequency of 2 MHz. And the system sampling frequency is reduced to 10MHz by combining with the heterodyne demodulation technique. The validity of the frequency shift is verified by using the Mach-Zehnder interferometer structure

and the accurate demodulation of the vibration signals of 200Hz

500Hz

1000Hz

and 2000Hz is successfully realised at the sampling frequency of 10MHz. In the repeatability experiment

the linear fitting coefficient reaches 0.9989

which verifies the stability of the system for vibration signal demodulation under low sampling frequency conditions

and provides an effective technical solution to reduce the hardware cost and data processing capacity of the Φ-OTDR system.

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references

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