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M-OTDR sensing system based on 3D encoded microstructures.

Qizhen Sun1,2, Fan Ai1,2, Deming Liu1,2

  • 1School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, Hubei, P. R. China.

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Summary
This summary is machine-generated.

A novel microstructured optical time domain reflectometry (M-OTDR) system offers high-resolution, quasi-distributed sensing. This fiber optic sensor achieves millimeter spatial resolution and precise temperature measurements, enabling advanced monitoring applications.

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Area of Science:

  • Fiber Optic Sensing
  • Optical Metrology
  • Distributed Sensing Systems

Background:

  • Traditional distributed sensing methods face limitations in spatial resolution and multiplexing capacity.
  • Ultra-weak microstructures in optical fibers offer unique reflective properties for enhanced sensing.

Purpose of the Study:

  • To propose and demonstrate a quasi-distributed sensing scheme using microstructured optical time domain reflectometry (M-OTDR).
  • To achieve high signal-to-noise ratio (SNR), millimeter-level spatial resolution, and high multiplexing capacity.

Main Methods:

  • Introduction of ultra-weak microstructures along an optical fiber to create sensing units.
  • Development of a demodulation method based on 3D (wavelength/frequency/time) analysis and spectrum reconstruction.
  • Construction of a proof-of-concept M-OTDR system with 64 sensing units.

Main Results:

  • The M-OTDR system demonstrated superior SNR and theoretical multiplexing capacity for tens of thousands of units.
  • A quasi-distributed temperature sensing system with 20 cm spatial resolution was realized.
  • A measurement resolution of 0.1°C was achieved for temperature sensing.

Conclusions:

  • The proposed M-OTDR scheme is feasible for high-performance quasi-distributed sensing.
  • This technology offers significant advantages in spatial resolution, SNR, and multiplexing capacity.
  • The system enables precise quasi-distributed temperature sensing with potential for various applications.