Large pipe size ultrasonic flowmeter on basis of TDC-GP22 (Time-to-Digital Conversion GP22) chip and signal enhancement method thereof

Abstract

The invention discloses a large pipe size ultrasonic flowmeter on the basis of a TDC-GP22 (Time-to-Digital Conversion GP22) chip and a signal enhancement method thereof and belongs to the field of instruments and apparatus. The large pipe size ultrasonic flowmeter on the basis of the TDC-GP22 chip and the signal enhancement method thereof are characterized in that a single-ended sending signal of the TDC-GP22 chip is converted into a differential signal, the differential signal is directly applied to a sending probe, a peak value of a sending signal peak is doubled, the received differential signal is amplified into a single-ended signal at a receiving end by a differential amplification circuit, and a bias voltage is attached to meet the requirement of the GP22 chip on the received signal so as to carry out accurate time measurement. The large pipe size ultrasonic flowmeter on the basis of the TDC-GP22 chip and the signal enhancement method thereof have the benefits and the advantages that the peak value of the sending signal peak is doubled so as to ensure that when a DN200-DN400 large pipe size is applied, the receiving end can still receive the relatively obvious signal; the amplification circuit is utilized to amplify the received signal, so that an amplitude of the received signal provided to the GP22 chip is ensured and guarantee is provided for accurate measurement on sound wave transmission time.

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 large pipe diameter of DN200 to DN400 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 d...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: the receiving signal of the DN200~DN400 large-diameter ultrasonic flowmeter based on TDC-GP22 is weak, and it is impossible to realize the problem of accurate measurement of time difference. The ultrasonic flowmeter receives the signal obtained on the probe, which provides a guarantee for the TDC-GP22 to accurately measure the sound wave transit time

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