Wave error prevention method for ultrasonic flowmeter and ultrasonic flowmeter

Abstract

The invention discloses a wrong wave prevention method for an ultrasonic flowmeter and the ultrasonic flowmeter. The method comprises the steps that an initial threshold value is set; according to the initial threshold value, a steady-state sine wave peak value and amplitudes of a plurality of continuous waveforms which exceed the initial threshold value and are before the steady-state sine wave are obtained from the first echo signal, and the amplitudes comprise a head wave and an adjacent waveform after the head wave; according to the steady-state sine wave peak value of the first echo signal and the amplitudes of the plurality of waveforms, calculating to obtain a first preset value; obtaining a second preset value of the second echo signal according to the initial threshold value; obtaining a second threshold value according to the ratio of the second preset value to the first preset value; and obtaining the head wave of the third echo signal according to a second threshold value. The ratio of the first preset value of the first echo signal to the second preset value of the second echo signal is calculated, the initial threshold is adjusted according to the ratio to obtain the second threshold, logic is simple, real-time calculation is facilitated, the influence of wrong waves can be avoided, the influence of interference on a metering result is reduced, and metering precision is improved.

Description

technical field [0001] The present application relates to the technical field of ultrasonic instruments, and in particular, to an error-proofing method for an ultrasonic flowmeter and an ultrasonic flowmeter. Background technique [0002] In recent years, with the advancement of science and technology, smart water meters have developed rapidly. Ultrasonic flowmeters have gained more and more attention in the field of flow detection due to their advantages of large range ratio, small initial flow, low pressure loss, and bidirectional measurement. application. Ultrasonic flowmeters generally use the time difference method for measurement. The time difference method is a measurement method that calculates the flow information according to the propagation time difference of the ultrasonic waves in the measured medium under two conditions of forward flow and reverse flow. At present, in the time difference method, the accurate forward and reverse flight time is generally obtaine...

AI Technical Summary

Problems solved by technology

In the actual application scene of the ultrasonic flowmeter, there will be more interference, such as scaling on the surface of the transducer, more impurities, environmental noise, etc. The appearance of these ubiquitous and unavoidable interference will cause the transducer to receive The signal changes, which leads to the situation that the set threshold does not meet the measurement requirements and the wrong wave occurs

[0003] In the conventional ultrasonic measurement algorithm, the usual method is to abandon the value of the wrong wave measured this time and use the last measured value instead. Measurement errors are generated, which affect the accuracy of measurement

Therefore, this method can only perform short-term compensation and cannot guarantee its measurement accuracy, let alone solve the problem of wrong waves in principle

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