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Optical Micro-Wire Flow-Velocity Sensor.

Matej Njegovec1, Simon Pevec1, Denis Donlagic1

  • 1Laboratory for Electro Optics and Sensor Systems, Faculty of Electrical Engineering and Computer Science, University of Maribor, Koroska cesta 46, 2000 Maribor, Slovenia.

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Summary
This summary is machine-generated.

This study introduces a novel gas-flow-velocity sensor with a fast response time. It utilizes a heated micro-wire and standard telecom components for accurate and cost-efficient flow measurement.

Keywords:
Fabry–Perot interferometerfiber flow sensorheat flow sensorhot wire anemometer

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Area of Science:

  • Optoelectronics
  • Sensor Technology
  • Fluid Dynamics

Background:

  • Accurate gas flow velocity measurement is crucial in various industrial and scientific applications.
  • Existing sensors often face limitations in response time, cost, or complexity.
  • Development of novel sensing mechanisms is needed to overcome these challenges.

Purpose of the Study:

  • To present a novel, all-silica, gas-flow-velocity sensor with a short response time.
  • To demonstrate a cost-efficient interrogation system using standard telecommunication components.
  • To enable dynamic flow sensing, including turbulence detection.

Main Methods:

  • Utilized a 16 µm diameter, optically absorbing micro-wire heated by a 980 nm light source.
  • Formed a Fabry-Perot interferometer with the heated micro-wire, monitored at 1550 nm.
  • Employed direct measurement of the sensor's thermal time constant for flow-velocity determination.

Main Results:

  • Achieved a sensor bandwidth of approximately 22 Hz at low flow velocities.
  • Demonstrated flow-velocity resolution up to 0.006 m/s using time constant measurement.
  • Obtained a resolution better than 0.003 m/s in constant power configuration at low flow velocities.

Conclusions:

  • The developed sensor offers a short response time and high resolution for gas flow velocity measurements.
  • The system's reliance on standard telecommunication components ensures cost-efficiency and suitability for diverse applications.
  • The sensor's capabilities extend to dynamic flow sensing and turbulence detection.