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Ultimate Spatial Resolution Realisation in Optical Frequency Domain Reflectometry with Equal Frequency Resampling.

Zhen Guo1, Gaoce Han1,2, Jize Yan2

  • 1Warwick Manufacturing Group (WMG), University of Warwick, Coventry CV4 7AL, UK.

Sensors (Basel, Switzerland)
|July 24, 2021
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Summary
This summary is machine-generated.

A novel equal frequency resampling method enhances spatial resolution in optical frequency domain reflectometry. This technique compensates for sampling inaccuracies, achieving 12.1 µm resolution and precise distributed temperature sensing.

Keywords:
distributed optical fibre sensornonlinear frequency sweepingoptical frequency domain reflectometry (OFDR)spatial resolution

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Area of Science:

  • Optoelectronics
  • Metrology
  • Fiber Optics

Background:

  • Optical Frequency Domain Reflectometry (OFDR) is crucial for high-resolution measurements.
  • Nonlinear laser frequency sweeping and sampling limitations in auxiliary interferometers hinder spatial resolution.
  • Accurate compensation techniques are needed to overcome these limitations.

Purpose of the Study:

  • To propose and validate an equal frequency resampling method to suppress nonlinear frequency sweeping in OFDR.
  • To improve the spatial resolution and accuracy of OFDR systems.
  • To demonstrate the application of the method in distributed temperature sensing.

Main Methods:

  • Developed an equal frequency resampling technique to correct sweeping frequency distribution inaccuracies.
  • Utilized an auxiliary interferometer with a 200 m optical path delay to analyze sampling limitations.
  • Integrated the resampling method with a drawing tower Fiber Bragg Grating (FBG) array to enhance Rayleigh backscattering for sensing.

Main Results:

  • Achieved a spatial resolution of 12.1 µm with a 130 nm sweeping range.
  • Demonstrated a spatial resolution of 21.3 µm at a 191 m fiber end with a 200 m auxiliary interferometer delay.
  • Realized distributed temperature sensing over 105 m with a 1 cm sensing resolution and ±0.15 °C uncertainty.

Conclusions:

  • The equal frequency resampling method effectively compensates for nonlinear frequency sweeping and sampling limitations in OFDR.
  • The proposed technique significantly enhances spatial resolution and enables high-accuracy distributed sensing.
  • This advancement has potential applications in various fields requiring precise optical measurements.