Ultrasonic flow instrument circuit system for preventing miswave interference

Abstract

The invention relates to an ultrasonic flow instrument circuit system for preventing miswave interference. The ultrasonic flow instrument circuit system comprises a singlechip module, a voltage comparing module, a signal shielding module, a water inlet end ultrasonic transducer and a water outlet end ultrasonic transducer, wherein the singlechip module controls the voltage comparing module, the signal shielding module, the water inlet end ultrasonic transducer and the water outlet end ultrasonic transducer. According to a control method, the first time measurement is used for locating a position of an ultrasonic signal and completely shielding interference signals before the ultrasonic signal occurs, and the second time measurement is used for accurately measuring the flying time of the ultrasonic signal and solving the time difference of the ultrasonic signal. The ultrasonic flow instrument circuit system has the effects that by using the principle that the ultrasonic signal velocity in a water direction is higher and the flying time is shorter and adopting a method for measuring the ultrasonic flying time in two steps, the time different of an ultrasonic flow instrument signal can be accurately measured, miswave interference is avoided, and the accuracy and the stability of an ultrasonic flow instrument are improved.

Description

technical field [0001] The invention relates to a time-difference method ultrasonic flow meter circuit, in particular to an ultrasonic flow meter circuit system for preventing error wave interference. Background technique [0002] During the flow measurement of the time-difference method ultrasonic flowmeter, due to the interference of the ultrasonic signal during transmission, the signal amplitude fluctuates, which may cause wrong wave interference, resulting in flow measurement errors. Most of the current solutions are to eliminate the maximum and minimum values ​​through digital filtering or to control the amplitude of the ultrasonic signal through automatic gain. The former method will reduce the amount of effective data, and the accuracy and stability of flow measurement will deteriorate. The latter method mostly uses a delayed automatic gain control circuit. In the case of sudden interference, the gain cannot be accurately controlled, resulting in wrong wave interferen...

AI Technical Summary

Problems solved by technology

The former method will reduce the amount of effective data, and the accuracy and stability of flow measurement will deteriorate. The latter method mostly uses a delayed automatic gain control circuit. In the case of sudden interference, the gain cannot be accurately controlled, resulting in wrong wave interference.

Neither of these two circuit schemes can perfectly solve the problem of wrong wave interference of ultrasonic flow meters

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