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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
09:48

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Published on: November 7, 2016

A BOTDA with break interrogation function over 72 km sensing length.

Junhui Hu1, Xuping Zhang, Yuguo Yao

  • 1Institute of Optical Communication Engineering, Nanjing University, Nanjing 210093, China.

Optics Express
|February 8, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces a Brillouin Optical Time Domain Analysis (BOTDA) sensor capable of break interrogation. The system achieves a 72 km sensing range and 5-meter resolution, enhancing fiber optic sensing robustness.

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Area of Science:

  • Optoelectronics
  • Fiber Optic Sensing
  • Distributed Sensing

Background:

  • Brillouin Optical Time Domain Analysis (BOTDA) is crucial for distributed strain and temperature sensing.
  • Nonlocal effects and signal-to-noise ratio (SNR) are key challenges in long-range BOTDA systems.
  • The need for robust sensing systems with fault detection capabilities is increasing.

Purpose of the Study:

  • To propose and experimentally demonstrate a BOTDA system with integrated break interrogation capabilities.
  • To enhance the performance of BOTDA systems by improving SNR and mitigating nonlocal effects.
  • To provide a robust and versatile solution for fiber optic sensing applications requiring two-end-access.

Main Methods:

  • Utilizing coherent detection to improve the signal-to-noise ratio (SNR).
  • Employing a double sideband probe method to effectively reduce nonlocal effects.
  • Implementing a system architecture that supports break interrogation, functioning as a coherent optical time domain reflectometry (COTDR) system.

Main Results:

  • Achieved a 72 km sensing range with a 5-meter spatial resolution without optical amplification.
  • Estimated temperature uncertainty of 1.8 °C.
  • Demonstrated a dynamic range of 36 dB with a 100 m spatial resolution for break interrogation.

Conclusions:

  • The developed BOTDA system offers enhanced robustness and fault detection capabilities.
  • The system provides an effective solution for two-end-access requirements in BOTDA sensing.
  • Coherent detection and double sideband probing significantly improve sensing performance and reliability.