A Mixed Signal Processing Circuit for Ultrasonic Gas Meter

Abstract

The invention relates to a mixed signal processing circuit of an ultrasonic gas meter. A preposed amplification circuit, an active high-order band-pass filtering circuit and an automatic gain fuzzy control circuit are sequentially connected serially, a dynamic peak detection circuit, a pulse generating circuit and a timing control circuit are connected with an output end of the automatic gain fuzzy control circuit respectively, an input end of the preposed amplification circuit serves as a signal input end of the whole circuit, and an output end of the dynamic peak detection circuit, an output of the pulse generating circuit and an output end of the timing control circuit serve as three signal output ends of the whole circuit. Ultrasonic signals of the ultrasonic gas meter are amplified through the preposed amplification circuit and filtered through the active high-order band-pass filtering circuit, ultrasonic signal peaks are adjusted in real time through the automatic gain fuzzy control circuit, and accuracy and stability in measuring are realized; by controlling timing of a timing unit through the timing control circuit, flowing speed of gas in a pipeline is accurately acquired.

Description

technical field [0001] The invention relates to a circuit, in particular to a mixed signal processing circuit for an ultrasonic gas meter. Background technique [0002] With the continuous improvement of living standards, people are increasingly pursuing environmental protection, and conventional energy sources with serious pollution are gradually abandoned by people. The country also introduced gas pipeline policies and corresponding measures in the 1960s and 1970s. With the construction and popularization of gas transmission pipelines, gas meters have sprung up, from mechanical membrane gas meters to electronic membrane gas meters, from membrane gas meters to ultrasonic gas meters, new concepts and technologies are constantly emerging . [0003] At present, there are two mainstream gas meters on the market, one is the traditional mechanical membrane gas meter, the other is the electronic membrane gas meter, and the ultrasonic gas meter is taking the lead in the gas meter...

AI Technical Summary

Problems solved by technology

However, its complex structure, huge volume, and the fact that the essential technology of measurement has not changed still restrict its development.

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