Gas ultrasonic flowmeter signal processing method based on echo signal envelopment fitting
An echo signal and signal processing technology, which is applied in the direction of liquid/fluid solid measurement, flow measurement/mass flow, and measurement devices, can solve the problems of high real-time requirements of instruments and difficulty in determining the arrival time of echo signals, etc.
Active Publication Date: 2018-03-27
HEFEI UNIV OF TECH
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[0010] Aiming at the problem that it is difficult for the gas ultrasonic flowmeter to determine the arrival time of the echo signal and the instrument has high requirements for real-time performance, this invention proposes a signal processing method for the gas ultrasonic flowmeter based on the envelope fitting of the echo signal, specifically including the method based on the echo signal Signal processing method of gas ultrasonic flowmeter based on upper envelope fitting of wave signal, signal processing method of gas ultrasonic flowmeter based on upper and lower envelope fitting of echo signal and improved method based on upper and lower envelope fitting of echo signal 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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[0026] figure 1 It is the echo signal and its upper and lower envelopes under different flow rates. It can be seen that several peak points in the middle part of the rising section of the upper envelope of the echo signal and the middle part of the falling section of the lower envelope are located on a straight line. to 0m 3 / h, 200m 3 / h, 400m 3 / h, 600m 3 / h, 800m 3 / h, 1000m 3 50 groups of echo signals under flow rate per hour are filtered, summed and averaged, and normalized, and curve fitting is performed on the positive and negative peak points of the signal with MATLAB to obtain the upper and lower envelopes of the echo signal, and the X axis is Sampling points correspond to time. The upper envelope falling section and the lower envelope rising section of the echo signal have greater distortion as the flow rate increases, and the peak points of the echo signal's upper envelope rising section and lower envelope falling section are affected by the ultrasonic transdu...
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The invention discloses a gas ultrasonic flowmeter signal processing method based on echo signal envelopment fitting. The gas ultrasonic flowmeter signal processing method specifically comprises the steps of upper envelopment fitting based on echo signals, upper envelopment fitting and lower envelopment fitting based on the echo signals and an improved gas ultrasonic flowmeter signal processing method based on upper envelopment fitting and lower envelopment fitting of the echo signals. The echo signals are processed through upper envelopment fitting based on the echo signals, upper envelopmentfitting and lower envelopment fitting based on the echo signals, and the improved gas ultrasonic flowmeter signal processing method based on upper envelopment fitting and lower envelopment fitting ofthe echo signals. Stable feature points are found, the ultrasonic signal forward and inverse flow transmission time is determined, and the gas flow is calculated. The gas ultrasonic flowmeter signalprocessing method is small in calculation amount, and it is guaranteed the system has high practicability; meanwhile, it is guaranteed that the gas ultrasonic flowmeter system satisfies high measurement precision.
Description
technical field [0001] The invention belongs to the field of flow detection, and is a signal processing method of a gas ultrasonic flowmeter, in particular a signal processing method of a gas ultrasonic flowmeter based on echo signal envelope fitting, specifically including echo signal upper envelope fitting, based on The upper and lower envelope fitting of the echo signal and the improved gas ultrasonic flowmeter signal processing method based on the upper and lower envelope fitting of the echo signal can realize the accurate measurement of the gas flow. Background technique [0002] Gas ultrasonic flowmeter has many advantages such as large range ratio, high measurement accuracy, no pressure loss, etc., especially in the measurement of large-diameter natural gas flow, it has unique advantages. The measurement principle of the gas ultrasonic flowmeter is divided into the propagation velocity difference method and the Doppler method. Propagation time difference method can b...
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IPC IPC(8): G01F1/66
CPCG01F1/66
Inventor 徐科军穆立彬刘博田雷
Owner HEFEI UNIV OF TECH