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This study introduces a novel distributed forward stimulated Brillouin scattering (FSBS) sensing method. It enables environmental sensing outside the fiber core, overcoming limitations of backward BSBS technology.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Sensing Technology

Background:

  • Distributed fiber sensing typically relies on backward stimulated Brillouin scattering (BSBS), limited to detecting parameters within the fiber core.
  • Forward stimulated Brillouin scattering (FSBS) offers potential for novel sensing in the fiber's surroundings due to transverse acoustic wave resonance.
  • Position-resolved FSBS detection is challenging due to the co-propagating nature of pump and scattered light.

Purpose of the Study:

  • To develop a distributed FSBS analysis technique for environmental sensing.
  • To overcome the challenge of spatial resolution in FSBS measurements.
  • To demonstrate the capability of FSBS for measuring local acoustic impedances in the fiber's surroundings.

Main Methods:

  • Developed a distributed FSBS analysis by recovering the phase change induced by FSBS on propagating light waves.
  • Employed a 730 m long fiber optic cable for sensing experiments.
  • Utilized an uncoated fiber segment for measuring acoustic impedances of surrounding liquids.

Main Results:

  • Achieved a spatial resolution of 15 meters over a 730-meter sensing length.
  • Successfully measured the local acoustic impedances of water and ethanol in a 30-meter fiber segment.
  • Experimental measurements of acoustic impedance showed good agreement with standard values.

Conclusions:

  • The developed distributed FSBS method enables sensing of parameters in the fiber's external environment.
  • This technique overcomes the spatial resolution limitations previously associated with FSBS.
  • The study validates FSBS as a viable technology for distributed environmental sensing and material characterization.