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<p>A compatible distributed optical fiber sensing system based on spatial division multiplexing Raman anti-stokes scattering light and Rayleigh scattering light is proposed and experimentally demonstrated. The sensing fibers for temperature monitoring and vibration event location are separated spatially. To ensure the temperature measurement accuracy, a new temperature calibration algorithm is proposed to overcome the interference caused by the instability of the laser source in the Raman anti-stokes scattering light based temperature measurement scheme. And, for vibration event location by the polarization state analysis of the time domain Rayleigh scattering light, a new threshold method by the subtraction between normalized trace data is adopted to exclude the fiber attenuation factor, and then improve the vibration event location performance. In the experiment, with a multi-mode fiber (MMF) of ~ 12 km and a single mode fiber of ~ 15 km, the temperature error range obtained is within − 1.77&#xa0;℃ to 1.56&#xa0;℃ and the root mean square error is 1.16&#xa0;℃ with a temperature measurement range from 20&#xa0;℃ to 90&#xa0;℃, and the vibration events are accurately located.</p>

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A compatible distributed optical fiber sensing system based on spatial division spectrum multiplexing

  • 期刊论文

  • 发表日期：

    2025年2月2日

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  • Lidong Lyu,
  • Zhikai Liu,
  • Yuxiang Feng,
  • Zihao Wang,
  • Minnan Huang

摘要

A compatible distributed optical fiber sensing system based on spatial division multiplexing Raman anti-stokes scattering light and Rayleigh scattering light is proposed and experimentally demonstrated. The sensing fibers for temperature monitoring and vibration event location are separated spatially. To ensure the temperature measurement accuracy, a new temperature calibration algorithm is proposed to overcome the interference caused by the instability of the laser source in the Raman anti-stokes scattering light based temperature measurement scheme. And, for vibration event location by the polarization state analysis of the time domain Rayleigh scattering light, a new threshold method by the subtraction between normalized trace data is adopted to exclude the fiber attenuation factor, and then improve the vibration event location performance. In the experiment, with a multi-mode fiber (MMF) of ~ 12 km and a single mode fiber of ~ 15 km, the temperature error range obtained is within − 1.77 ℃ to 1.56 ℃ and the root mean square error is 1.16 ℃ with a temperature measurement range from 20 ℃ to 90 ℃, and the vibration events are accurately located.