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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Optical Frequency-Domain Reflectometry Based Distributed Temperature Sensing Using Rayleigh Backscattering Enhanced

Ziyi Lu1,2, Ting Feng1,2, Fang Li1,2

  • 1Photonics Information Innovation Center, College of Physics Science & Technology, Hebei University, Baoding 071002, China.

Sensors (Basel, Switzerland)
|July 8, 2023
PubMed
Summary
This summary is machine-generated.

A new optical frequency-domain reflectometry (OFDR) method uses enhanced fiber optics for precise temperature sensing. This technique accurately measures temperature variations by analyzing shifts in high backscattering points along the fiber.

Keywords:
Rayleigh backscattering enhanced fiberdistributed optical fiber sensingoptical frequency-domain reflectometrytemperature measurement

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Area of Science:

  • Photonics and Optical Sensing
  • Materials Science
  • Metrology

Background:

  • Distributed temperature sensing (DTS) is crucial for monitoring infrastructure and industrial processes.
  • Traditional DTS methods face limitations in spatial resolution and accuracy.
  • Optical frequency-domain reflectometry (OFDR) offers high resolution but requires specialized sensing elements.

Purpose of the Study:

  • To develop an innovative OFDR-based distributed temperature sensing method.
  • To utilize a novel Rayleigh backscattering enhanced fiber (RBEF) as the sensing medium.
  • To achieve accurate and high-resolution temperature demodulation.

Main Methods:

  • Employing a Rayleigh backscattering enhanced fiber (RBEF) with distinct high backscattering points.
  • Utilizing the sliding cross-correlation method to analyze shifts in backscattering point positions.
  • Calibrating the relationship between backscattering point position shifts and temperature variations for demodulation.

Main Results:

  • Demonstrated a linear relationship between temperature variation and the displacement of high backscattering points.
  • Achieved a temperature sensing sensitivity coefficient of 7.814 μm/(m·°C).
  • Reported an average relative temperature error of -1.12% and a positioning error as low as 0.02 m.

Conclusions:

  • The proposed OFDR method with RBEF enables accurate distributed temperature sensing.
  • Spatial resolution is governed by the distribution of high backscattering points.
  • High temperature sensing resolution (0.418 °C/m) is achievable with a 12.5 μm OFDR system resolution.