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Echo signal envelope fitting based signal processing methods for ultrasonic gas flow-meter.

Li-Bin Mu1, Ke-Jun Xu2, Bo Liu1

  • 1School of Electrical and Automation Engineering, Hefei University of Technology, Hefei 230009, China.

ISA Transactions
|January 9, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a new signal processing method for ultrasonic gas flow meters, improving echo signal location accuracy and real-time performance. The developed method enhances the measurable range and turndown ratio of the flow meters.

Keywords:
Calibration experimentsDSPDigital signal processing methodsEcho signal envelope fittingFPGAUltrasonic gas flow-meter

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Area of Science:

  • Instrumentation and Measurement Science
  • Fluid Dynamics and Flow Measurement

Background:

  • Traditional ultrasonic gas flow meters face challenges with echo signal localization and computationally intensive signal processing, limiting real-time performance.
  • Existing methods struggle to accurately pinpoint echo signals, impacting the overall efficiency and reliability of gas flow measurement.

Purpose of the Study:

  • To develop an improved signal processing technique for ultrasonic gas flow meters that enhances echo signal localization.
  • To address the real-time performance limitations of current methods by proposing computationally efficient algorithms.
  • To expand the measurable range and turndown ratio of ultrasonic gas flow meters.

Main Methods:

  • Analysis of echo signal envelopes at various flow rates to identify consistent patterns.
  • Development of mathematical models for upper and lower envelope sections to derive envelope gradient curves.
  • Application of least squares fitting on peak points to establish feature straight lines for rapid echo signal localization.
  • Implementation of the best-performing signal processing method on a Field-Programmable Gate Array (FPGA) and Digital Signal Processor (DSP) dual-core hardware system.

Main Results:

  • The proposed signal processing method, based on echo signal upper and lower envelope fitting, accurately and quickly locates echo signals.
  • The developed system demonstrated a broadened measurable range from 10 m³/h to 1,300 m³/h.
  • A significant improvement in the turndown ratio was achieved, extended to 1:130.

Conclusions:

  • The novel signal processing approach effectively overcomes the limitations of existing methods in ultrasonic gas flow measurement.
  • The integration of FPGA and DSP technologies enables efficient real-time signal processing and control.
  • The enhanced ultrasonic gas flow meter exhibits superior performance in terms of accuracy, range, and turndown ratio.