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High-Temperature Sensing Based on GAWBS In Silica Single-Mode Fiber.

Shaonian Ma1,2, Yuxi Pang1,2, Qiang Ji1,2

  • 1Center for Optics Research and Engineering, Shandong University, Qingdao 266237, China.

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|February 11, 2023
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Summary

Guided Acoustic Wave Brillouin Scattering (GAWBS) offers a robust method for high-temperature monitoring in silica optical fibers. This technique demonstrates reliable performance up to 800°C, ideal for harsh environments.

Keywords:
forward Brillouin scatteringguided acoustic wave Brillouin scatteringhigh-temperature measurementoptical fiber sensors

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Area of Science:

  • Optical Fiber Sensing
  • Materials Science
  • Acoustic Physics

Background:

  • High-temperature detection is crucial for condition monitoring in harsh industrial environments.
  • Existing optical fiber sensing methods face challenges in extreme temperature conditions.

Purpose of the Study:

  • To experimentally investigate the temperature response of Guided Acoustic Wave Brillouin Scattering (GAWBS) spectra in silica single-mode fibers (SMF) up to 800°C.
  • To demonstrate the feasibility of GAWBS for high-temperature monitoring applications.

Main Methods:

  • Experimental analysis of GAWBS spectra in SMF at temperatures ranging from ambient to 800°C.
  • Measurement of resonance frequency, linewidth, and signal-to-noise ratio of GAWBS spectra.
  • Linear fitting of temperature-dependent frequency shift coefficients and linewidth changes.

Main Results:

  • GAWBS resonance frequency showed a nearly linear increase with temperature (8.19 kHz/°C for TR2,7 and 16.74 kHz/°C for R0,4).
  • GAWBS spectral linewidth decreased linearly with increasing temperature (-6.91 × 10⁻⁴/°C for TR2,7 and -8.56 × 10⁻⁴/°C for R0,4).
  • Signal-to-noise ratio improved by over 3 dB from 22°C to 800°C, indicating enhanced performance at high temperatures.

Conclusions:

  • GAWBS is a feasible and effective method for high-temperature monitoring in silica SMF without complex fabrication.
  • The sensing scheme exhibits improved performance and suitability for extreme environments due to its mechanical strength, simple structure, and low cost.