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Distributed hot-wire anemometry based on Brillouin optical time-domain analysis.

Michael T V Wylie1, Anthony W Brown, Bruce G Colpitts

  • 1Department of Electrical and Computer Engineering, University of New Brunswick, Fredericton, NB, E3B 1X2 Canada. Michael.Wylie@unb.ca

Optics Express
|July 10, 2012
PubMed
Summary

A novel distributed hot-wire anemometer uses Brillouin optical time-domain analysis to measure airflow. This fiber optic sensor demonstrates feasibility for wind speed measurements up to 10 m/s.

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Area of Science:

  • Physics
  • Optical Engineering
  • Fluid Dynamics

Background:

  • Traditional hot-wire anemometers have limitations in distributed sensing.
  • Optical sensing offers potential for enhanced measurement capabilities.

Purpose of the Study:

  • To develop and demonstrate a distributed hot-wire anemometer using Brillouin optical time-domain analysis (BOTDA).
  • To investigate the feasibility of BOTDA for measuring airspeeds.

Main Methods:

  • A current was passed through a stainless steel tube fiber bundle.
  • Brillouin frequency shifts were monitored in response to airflow.
  • Device response was calibrated against theoretical models using a wind tunnel.

Main Results:

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  • The sensitivity equation for the anemometer was derived and discussed.
  • Feasible measurements of airspeeds ranging from 0 m/s to 10 m/s were achieved.
  • Brillouin scattering-based distributed hot-wire anemometry was shown to be viable.

    • Conclusions:

    • A novel distributed hot-wire anemometer based on BOTDA is feasible.
    • This technology offers a new approach for distributed airflow measurement.
    • Further research can explore advanced applications of this optical sensing technique.