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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Published on: November 7, 2016

Long-range simplex-coded BOTDA sensor over 120 km distance employing optical preamplification.

Marcelo A Soto1, Gabriele Bolognini, Fabrizio Di Pasquale

  • 1Scuola Superiore Sant' Anna, via G. Moruzzi 1, 56124, Pisa, Italy,

Optics Letters
|January 26, 2011
PubMed
Summary
This summary is machine-generated.

This study enhances Brillouin optical time-domain analysis (BOTDA) sensors using optical preamplification and pulse coding. The optimized system achieves 120 km sensing range with high spatial resolution and accuracy.

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Area of Science:

  • Optoelectronics
  • Fiber Optic Sensing
  • Signal Processing

Background:

  • Brillouin optical time-domain analysis (BOTDA) is a powerful technique for distributed fiber optic sensing.
  • Extending the sensing range of BOTDA systems is crucial for applications requiring long-distance monitoring.
  • Existing BOTDA systems face limitations in range and spatial resolution.

Purpose of the Study:

  • To extend the sensing range of BOTDA sensors.
  • To improve the spatial resolution and accuracy of BOTDA measurements.
  • To demonstrate a novel approach combining optical preamplification, pulse coding, and optimized modulation.

Main Methods:

  • Utilized optical preamplification at the receiver.
  • Implemented optical pulse coding techniques.
  • Employed an optimized return-to-zero modulation format with a 25% duty cycle.
  • Combined these techniques for enhanced signal detection and range.

Main Results:

  • Successfully extended the sensing range to 120 km of standard single-mode fiber.
  • Achieved a spatial resolution of 3 m.
  • Obtained an root-mean-square (rms) strain-temperature accuracy of 60 με and 3.1 °C, respectively.
  • Demonstrated effective temperature and strain measurements over the extended range.

Conclusions:

  • The combination of optical preamplification, pulse coding, and optimized modulation significantly enhances BOTDA sensor performance.
  • This approach enables long-range, high-resolution distributed sensing in standard single-mode fibers.
  • The developed technique offers a viable solution for demanding fiber optic sensing applications.