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Systematic-error suppression in low-coherence Brillouin optical correlation-domain reflectometry.

Kenta Otsubo1, Guangtao Zhu1, Takaki Kiyozumi1

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|October 16, 2023
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Low-coherence Brillouin optical correlation-domain reflectometry (BOCDR) enables single-end sensing with 3 cm resolution. This advanced technique eliminates systematic errors, improving measurement precision for distributed strain and temperature sensing.

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Area of Science:

  • Optoelectronics
  • Fiber optic sensing
  • Photonics

Background:

  • Brillouin optical correlation-domain analysis (BOCDA) provides high-resolution distributed sensing but requires dual-end light injection.
  • Low-coherence Brillouin optical correlation-domain reflectometry (BOCDR) was developed for single-end injection using spontaneous Brillouin scattering.
  • Previous demonstrations achieved 19 cm resolution, but accuracy compared to standard systems was unexplored.

Purpose of the Study:

  • To present a novel low-coherence BOCDR system with enhanced spatial resolution.
  • To evaluate the measurement accuracy of low-coherence BOCDR.
  • To demonstrate the elimination of systematic errors in low-coherence BOCDR.

Main Methods:

  • Implementation of a low-coherence light source for Brillouin scattering.
  • Development of a single-end light injection configuration for BOCDR.
  • Characterization of distributed strain and temperature measurements with high spatial resolution.

Main Results:

  • Achieved a spatial resolution of approximately 3 cm for distributed measurements.
  • Demonstrated elimination of systematic errors associated with direct sinusoidal modulation.
  • Showcased enhanced measurement precision compared to conventional methods.

Conclusions:

  • Low-coherence BOCDR offers a viable alternative to dual-end injection systems.
  • The technique provides high-resolution distributed sensing with improved accuracy.
  • This advancement is crucial for precise strain and temperature monitoring in various applications.