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Measuring Liquid-Level Utilizing Wedge Wave.

Iwao Matsuya1, Yudai Honma2, Masayuki Mori3

  • 1Department of Mechanical Engineering, Nagaoka University of Technology, Niigata 940-2188, Japan. matsuya@mech.nagaokaut.ac.jp.

Sensors (Basel, Switzerland)
|December 22, 2017
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Summary

This study introduces a novel liquid-level measurement technique using wedge waves, achieving high accuracy and resolution. The method surpasses industry standards, offering a significant advancement in sensing technology.

Keywords:
FEM simulationliquid-levelultrasoundwedge wave

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Area of Science:

  • Acoustics
  • Materials Science
  • Metrology

Background:

  • Accurate liquid-level measurement is crucial in various industrial applications.
  • Existing methods may face limitations in precision and resolution.
  • Guided acoustic waves offer potential for advanced sensing solutions.

Purpose of the Study:

  • To present and validate a new liquid-level measurement technique utilizing wedge waves.
  • To compare finite element method (FEM) simulation results with experimental data.
  • To establish the viability of wedge wave propagation for precise liquid-level sensing.

Main Methods:

  • Finite Element Method (FEM) simulation of wedge wave propagation.
  • Experimental validation using an aluminum waveguide with a 30° wedge.
  • Analysis of wedge wave velocities in air and water.
  • Measurement of liquid-level based on the travel time of mode 1 wedge waves.

Main Results:

  • FEM simulations and experiments show good agreement for wedge wave velocities and sensitivities.
  • The developed technique achieves measurement uncertainties of 0.21 mm (interface echo) and 0.12 mm (end echo), below the 1.5 mm industry standard.
  • A measurement resolution of 7.68 μm was achieved using the interface echo, representing the highest resolution for guided acoustic wave-based liquid-level sensing.

Conclusions:

  • The presented wedge wave technique provides a robust and accurate method for liquid-level measurement.
  • The foundation framework for this sensing method is validated through combined simulation and experimental data.
  • This technology offers superior precision and resolution compared to current industry benchmarks.