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Writing Bragg Gratings in Multicore Fibers
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Single- and two-phase flow characterization using optical fiber bragg gratings.

Virgínia H V Baroncini1, Cicero Martelli2, Marco José da Silva3

  • 1Graduate School of Electrical Engineering and Computer Science, Federal University of Technology-Paraná (UTFPR), Curitiba 80230-901, Brazil. virginia@utfpr.edu.br.

Sensors (Basel, Switzerland)
|March 20, 2015
PubMed
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Optical fiber Bragg gratings (FBGs) can characterize single- and two-phase flows by detecting hydrodynamic pressure. This method accurately measures mass flow and distinguishes between air bubbles and liquid slugs in pipes.

Area of Science:

  • Fluid dynamics
  • Optical sensing technologies
  • Materials science

Background:

  • Accurate flow characterization is crucial for industrial processes.
  • Existing methods for two-phase flow measurement can be complex and costly.
  • Optical Fiber Bragg Gratings (FBGs) offer a potential non-intrusive sensing solution.

Purpose of the Study:

  • To present a novel method for single- and two-phase flow characterization using FBGs.
  • To demonstrate the capability of FBGs to detect and differentiate flow regimes based on hydrodynamic pressure.
  • To develop and validate a quasi-distributed sensing system for flow monitoring.

Main Methods:

  • FBGs were transversely positioned in pipe walls to detect hydrodynamic pressure.
  • Grating resonance wavelength shift was correlated with mass flow and flow velocity.

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  • A quasi-distributed sensing system with 18 FBG sensors was developed and tested.
  • Distinction between air bubbles and liquid slugs was achieved by analyzing FBG deformation patterns.

    • Main Results:

    • FBG-based sensing accurately determined mass flow in single-phase flows.
    • Distinct wavelength shifts were observed for air bubbles and liquid slugs in two-phase flows.
    • The quasi-distributed system enabled flow characterization and bubble tracking over a large pipe section.
    • Results showed good agreement with standard flow measurement techniques.

    Conclusions:

    • FBGs provide a robust and accurate method for single- and two-phase flow characterization.
    • The developed sensing system is suitable for both laboratory and field applications.
    • This technology offers a promising alternative for advanced flow monitoring and control.