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Related Concept Videos

Pipe Flowrate Measurement01:28

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High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition
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Multipath ultrasonic gas flow-meter based on multiple reference waves.

Hongliang Zhou1, Tao Ji1, Ruichen Wang2

  • 1State Key Laboratory of Industrial Control Technology, College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China.

Ultrasonics
|August 19, 2017
PubMed
Summary
This summary is machine-generated.

This study introduces an averaging method to improve ultrasonic gas flow-meter accuracy. By using an averaged reference wave, the transit-time measurement is enhanced, leading to more precise flow rate determination.

Keywords:
Averaging methodCross correlationMultipath ultrasonic flow-meterReference waveTransit-time method

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Area of Science:

  • Mechanical Engineering
  • Fluid Dynamics
  • Acoustics

Background:

  • Ultrasonic gas flow-meters are widely used, with transit-time measurement being a popular technique.
  • Cross-correlation algorithms offer advantages for determining ultrasonic wave time-of-flight (TOF) in noisy conditions.
  • Accurate TOF measurement is crucial, but reference wave selection for cross-correlation is complex, especially in multipath systems.

Purpose of the Study:

  • To address the challenge of reference wave selection in multipath ultrasonic gas flow-meters.
  • To propose and evaluate an averaging method for determining the reference wave to enhance TOF measurement precision.

Main Methods:

  • Analyzed factors causing noise and waveform distortion in ultrasonic signals.
  • Developed an averaging method to determine a more robust reference wave for cross-correlation.
  • Designed and tested a six-path ultrasonic gas flow-meter using the proposed averaging method.

Main Results:

  • The averaging method significantly improved the accuracy of flow rate measurements.
  • Repeatability of time-of-flight (TOF) measurements was substantially enhanced compared to using a random reference wave.
  • The proposed method demonstrated effectiveness in a practical six-path ultrasonic gas flow-meter.

Conclusions:

  • The averaging method for reference wave selection is a viable solution for improving multipath ultrasonic gas flow-meter performance.
  • This technique leads to more reliable and accurate gas flow rate measurements, especially in challenging environments.
  • Further research could explore variations of the averaging method for different ultrasonic flow-meter configurations.