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Signal processing method of gas ultrasonic flowmeter based on echo rising segment peak fitting and echo energy point positioning

A technology of echo signal and signal processing, which is applied in the direction of measuring flow/mass flow, measuring device, liquid/fluid solid measurement, etc., and can solve problems such as difficult to determine the arrival time

Active Publication Date: 2019-02-01
HEFEI UNIV OF TECH
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Problems solved by technology

[0018] Aiming at the problem that it is difficult to determine the arrival time from the echo signal of the gas ultrasonic flowmeter, and the instrument requires high real-time performance, the present invention proposes a method based on echo rising segment peak fitting and a method based on echo energy point positioning. The gas ultrasonic flowmeter signal processing method, and on the two-channel gas ultrasonic flowmeter hardware platform developed by Hefei University of Technology (Xu Kejun, Fang Min, Wang Wei, Zhu Wenjiao, Shen Ziwen

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  • Signal processing method of gas ultrasonic flowmeter based on echo rising segment peak fitting and echo energy point positioning
  • Signal processing method of gas ultrasonic flowmeter based on echo rising segment peak fitting and echo energy point positioning
  • Signal processing method of gas ultrasonic flowmeter based on echo rising segment peak fitting and echo energy point positioning

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Embodiment Construction

[0035] See figure 1 The hardware system of the present invention is composed of a transducer unit, a transmission / reception signal channel switching circuit, an excitation signal generation and amplification circuit, an echo signal conditioning and sampling circuit, a DSP minimum system, an FPGA minimum system and a power management module.

[0036] The transducer unit is composed of four transducers, which are respectively fixedly installed on the pipeline for conveying gas flow; the four transducers are transducer 1, transducer 2, transducer 3, and transducer. 4. Set up as a direct-fired two-channel structure; each transducer is used as both a transmitting transducer and a receiving transducer.

[0037] The DSP minimum system consists of a DSP chip, a clock module, an external watchdog module, a FRAM (ferroelectric memory) module, a serial communication module, and a button / liquid crystal module. The model of the DSP chip is TMS320F28335.

[0038] The FPGA minimum system consists ...

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Abstract

The invention provides a gas ultrasonic flowmeter signal processing method based on echo ascent stage peak value fitting. The method includes the steps that firstly, multiple peak value points are selected at the ascent stage of echo signals according to the fitting peak value range; all the peak value points are subjected to least square fitting, and a feature straight line is obtained; intersections of the straight line and transverse axis sampling points serve as feature points, the downcurrent and countercurrent propagation time of ultrasonic signals is determined, and the gas flow is calculated. A gas ultrasonic flowmeter signal processing method based on echo energy point positioning includes the steps that firstly, energy values for positioning energy points serve as reference, and four most-adjacent peak value energy points are found for linear fitting; the energy points, corresponding to the energy values, on a fitting straight line are found as feature points, the downcurrent and countercurrent propagation time of the ultrasonic signals is determined, and the gas flow is calculated.

Description

Technical field [0001] The invention relates to the field of flow measurement, and is a gas ultrasonic flowmeter signal processing method, in particular to a gas ultrasonic flowmeter signal processing method based on echo rising peak fitting and echo energy point positioning. The two gas ultrasonic flowmeter signal processing methods proposed in the present invention are used to process the ultrasonic echo signal to realize the measurement of the gas flow. Background technique [0002] Gas ultrasonic flowmeters are widely used in gas flow measurement in large-diameter pipelines due to their high accuracy, no pressure loss, large range ratio and many other advantages. The measurement methods (principles) of gas ultrasonic flowmeters mainly include propagation time difference method, propagation frequency difference method and Doppler method. Among them, the propagation time difference method is the most widely used and effective method for gas ultrasonic flow meters. When the pr...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/66
CPCG01F1/66
Inventor 徐科军田雷穆立彬刘博沈子文李剑波
Owner HEFEI UNIV OF TECH
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