TDC-GP22-based ultra-large pipe diameter ultrasonic flowmeter and method for signal enhancement thereof

Abstract

The invention discloses a TDC-GP22-based ultra-large pipe diameter ultrasonic flowmeter and a method for signal enhancement thereof, and belongs to the field of instruments and meters. The TDC-GP22-based ultra-large pipe diameter ultrasonic flowmeter and the method for signal enhancement thereof are characterized in that MOSFET is adopted to convert a 3.3 V single-ended sending signal of the TDC-GP22 into a differential signal with the peak-to-peak value of 30 V which is directly exerted on a sending probe, so that the peak-to-peak value of the TDC-GP22 is increased by 10 times approximately; the receiving end amplifies the received differential signal into a single-ended signal through a differential amplification circuit, and adds a bias voltage to satisfy the requirement of the GP22 on the received signal, so as to accurately measure time. The TDC-GP22-based ultra-large pipe diameter ultrasonic flowmeter and the method for signal enhancement thereof have the effect and benefit that the peak-to-peak value of the sending signal is increased from 3.3 V to 30 V; when an ultra-large pipe with diameter of DN 400-DN 1200 is guaranteed, the receiving end can still receive an obvious signal; an amplification circuit is adopted to amplify the received signal, so that the amplitude provided for the received signal of the GP22 is fully guaranteed, and accurate measurement of sound wave transmission time is guaranteed.

Description

technical field [0001] The invention belongs to the field of instruments and meters, and relates to a water flow measurement method, in particular to a method for enhancing the sending and receiving signals of an ultrasonic flowmeter with a DN400-DN1200 ultra-large pipe diameter in the water flow measurement. Background technique [0002] Ultrasonic flowmeter has the advantages of high measurement accuracy and convenient use, and has been widely used in water flow measurement. It calculates the instantaneous flow velocity of water by using the time difference of the sound wave in the downstream and upstream propagation, and then obtains the instantaneous flow rate when the water flows according to the cross-sectional area of ​​the pipeline, and then obtains the cumulative flow rate when the water flows by integrating the time. It can be seen that when the ultrasonic flowmeter is working, it needs to send a signal through the upstream probe and receive the signal through the ...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: the receiving signal of the DN400~DN1200 ultra-large diameter ultrasonic flowmeter based on TDC-GP22 is weak, and the time difference cannot be accurately measured. The pipe diameter ultrasonic flowmeter receives the signal obtained from the probe, which provides a guarantee for the TDC-GP22 to accurately measure the sound wave transit time

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