Flow detection method and device and storage medium

Abstract

The embodiment of the invention provides a flow detection method and device and a storage medium. During flow detection, when it is detected that a first change rate of a first time difference of a current moment and a second time difference of a previous moment of an ultrasonic flowmeter under a first sampling frequency is larger than a preset value, the flow is detected to be detected; and judging whether the sudden flow change in the pipeline is caused by switching operation executed by a valve of the pipeline or not. If the sudden change of the flow in the pipeline is caused by switching operation on the valve of the pipeline, the first noise covariance and the second noise covariance are adopted for filtering the time difference of switching operation and non-switching operation on the valve respectively, the corresponding first filtering time difference and second filtering time difference are obtained, and therefore the flow in the pipeline is detected. According to the technical scheme, after the reason for the sudden flow change is judged, the two different noise covariances are used for filtering the time difference, caused by the sudden flow change, of the ultrasonic flowmeter, and the accuracy of flow detection of the ultrasonic flowmeter is improved.

Description

technical field [0001] The present application relates to the field of traffic detection, and in particular, to a traffic detection method, device and storage medium. Background technique [0002] In recent years, with the advancement of technology and the improvement of people's living standards, it is necessary to detect traffic in many places in people's daily life and industrial production. For example, the water flow and natural gas flow of tap water commonly used in daily life. Ultrasonic flowmeter stands out among many flowmeters by virtue of its high measurement accuracy and easy installation and use. The ultrasonic flowmeter uses the time difference generated by the propagation of sound waves in the forward and reverse flow, so as to detect the flow in the pipeline. However, during the use of the ultrasonic flowmeter, the influence of other sounds on its accuracy cannot be avoided. [0003] In the prior art, in order to avoid the interference of noise on the ultr...

AI Technical Summary

Problems solved by technology

However, when this technical solution is used to filter the time difference of the ultrasonic flowmeter, it will cause the ultrasonic flowmeter to mistake the sudden change of time difference caused by noise as the real sudden change of flow caused by the sudden change of time difference, thus recording the unreal flow caused by noise as Real flow, and cumulative counting on the ultrasonic flowmeter, reducing the accuracy of the ultrasonic flowmeter

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