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Pipe Flowrate Measurement01:28

Pipe Flowrate Measurement

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Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques
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Published on: March 12, 2019

Laser Doppler field sensor for high resolution flow velocity imaging without camera.

Andreas Voigt1, Christian Bayer, Katsuaki Shirai

  • 1Department of Electrical Engineering and Information Technology, Dresden University of Technology, Helmholtzstrasse 18, 01069 Dresden, Germany. Andreas.Voigt@tu-dresden.de

Applied Optics
|September 23, 2008
PubMed
Summary

This study introduces a novel laser sensor for high-resolution flow imaging, enhancing spatial and velocity measurements without a camera. This advancement offers improved accuracy for microfluidic applications.

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Area of Science:

  • Fluid dynamics
  • Optical sensing technologies
  • Microfluidics

Background:

  • Conventional laser Doppler anemometry (LDA) faces limitations in spatial and velocity resolution.
  • Camera-based imaging systems are susceptible to pixel size effects, impacting measurement accuracy.

Purpose of the Study:

  • To present a novel laser sensor for highly spatially resolved flow imaging.
  • To overcome the resolution limitations of conventional LDA and camera-based methods.
  • To demonstrate the sensor's capability in measuring flow dynamics.

Main Methods:

  • The sensor extends laser Doppler anemometry (LDA) principles by employing diverging and converging fringe systems.
  • Utilizes four fringe systems to resolve flow in two spatial dimensions and the orthogonal velocity component.
  • Eliminates camera usage, thereby avoiding pixel size-related resolution constraints.

Main Results:

  • Achieved a spatial resolution of 4 micrometers (x-direction) and 16 micrometers (y-direction).
  • Demonstrated a relative velocity resolution of 1x10⁻³.
  • Successfully applied the sensor for velocity measurements in an injection nozzle flow.

Conclusions:

  • The developed laser sensor provides significantly enhanced spatial and velocity resolution compared to conventional LDA.
  • The camera-free design ensures resolution is independent of pixel size effects.
  • The sensor is highly suitable for applications in nano- and microfluidics, including flow rate measurements.