Improve the measurement accuracy of ultrasonic flowmeter

Abstract: The information on improving the measurement accuracy of ultrasonic flowmeters is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. The ultrasonic flow detection technology realizes the flow velocity measurement according to the modulation of the ultrasonic propagation speed of the measured fluid. In recent years, with the application of digital signal processing technology, large-scale digital circuits and the emergence of new ultrasonic transducers, ultrasonic flow detection has been promoted. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on improving the measurement accuracy of ultrasonic flowmeters. The ultrasonic flow detection technology realizes the flow velocity measurement according to the modulation of the ultrasonic propagation speed of the measured fluid. In recent years, with the application of digital signal processing technology, large-scale digital circuits and the emergence of new ultrasonic transducers, the ultrasonic flow detection technology has made great progress. Compared with traditional flowmeters, ultrasonic flowmeters solve the problems of large pipe diameters, large flow rates and the difficulty of measuring liquid flow in various open channels and underdrains. At the same time, they can measure liquids, gases, and even liquids including dual-phase media. Flow, no requirement for measuring medium. And it has the advantages of low pressure drop, low energy consumption and high measurement accuracy, so it is gradually replacing the mechanical flowmeter. However, when ultrasonic waves are used for small-diameter flow measurement, the useful measurement signals are easily overwhelmed by clutter due to the short time for ultrasonic waves to pass through the liquid to be measured, thus affecting the measurement accuracy of flow. Aiming at the above problems of small-diameter ultrasonic flow detection, the problem of measurement accuracy is better solved through the improvement of hardware circuit design and software algorithm. 2 Ultrasonic flowmeter transducer drive and signal processing The ultrasonic flowmeter detection methods mainly include: time difference method, Doppler effect method, correlation method, noise method, beam shift method, etc. The time difference method ultrasonic flow is dependent on the ultrasonic signal. After propagating into the medium, the flow rate information of the medium will be carried in the flowing medium. The ultrasonic echo signal with the flow rate information will be received by the ultrasonic receiving sensor into the circuit board, and after a series of signal processing, the measured signal will be obtained. The velocity or flow of a medium. (1) The working principle of the time difference method ultrasonic flowmeter The key to the time difference method measurement is to be able to obtain high-precision time measurement parameters. In recent years, with the continuous emergence of high-speed time counting processing chips, the measurement accuracy of tens of picoseconds has changed. If possible, this provides a metrological guarantee for the transit time method for small-diameter ultrasonic flowmeters. Figure 1 is a basic schematic diagram of the time difference ultrasonic flow measurement method. Figure 1. Principle of ultrasonic flow measurement Two ultrasonic probes A and B can both transmit and receive. When probe A transmits and B receives, the ultrasonic wave propagates downstream in the fluid, and its speed is accelerated, and the downstream time is measured; Conversely, the speed of the ultrasonic wave will slow down when it propagates upstream. In the time difference method, the forward propagation time t1 is: the countercurrent propagation time t2 is: the forward and reverse flow time difference Δt is: Available: Among them, C is the sound speed of the ultrasonic wave in the liquid; L is the distance between the two transducers; V is The average flow velocity in the direction of the central axis of the pipe;θis the incident angle of the ultrasonic wave into the liquid; τ is the additional time of the ultrasonic wave outside the liquid propagation. (2) Drive control of ultrasonic transducer In ultrasonic flow measurement, the transducer should be driven first, and the transducer should be excited to oscillate and send out ultrasonic signals. The following are 1 driving pulse, 10 driving pulses and 15 driving pulses are used as the excitation source of the transducer. Figure 2 is the waveform received by the transducer at the receiving end when one driving pulse is used. It can be seen that when a pulse is driven, the received waveform is relatively weak and the waveform is very irregular. Figure 3 is the waveform received by the transducer at the receiving end when there are 10 driving pulses. The waveform shape is significantly improved. Figure 4 is the waveform received by the transducer at the receiving end when there are 15 driving pulses. Fig.2 1 driving pulse receiving waveformFig.3 10 pulse receiving waveformFig.4 15 pulse receiving waveform It can be seen from the above figures that the receiving waveform of the transducer is a relatively standard sine wave when there are 15 pulses, and the amplitude is relatively Large, GP2 can issue up to 15 drive pulses, so select 15 drive pulses. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Improving the Measurement Accuracy of Ultrasonic Flow Meters'

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