Method and device for detecting ultrasonic flow by time-difference method

Abstract

The invention discloses a method and a device for detecting ultrasonic flow by the time-difference method. The method includes: enabling to-be-tested gases to be freely spread into a static speed pipe when the to-be-tested gases flow through a pipe section of a measuring pipe provided with an ultrasonic transducer group, the static speed pipe is provided with ultrasonic transducers used for emitting and receiving ultrasonic waves into the static speed pipe, sonic path distance of the ultrasonic waves spreading in the static speed pipe can be obtained according to arrangement of the ultrasonic transducers on the static speed pipe, actual spreading time of the ultrasonic waves in the sonic path distance can be obtained by emitting and receiving the ultrasonic waves by the ultrasonic transducers in the static speed pipe, the spreading speed Cf of the ultrasonic waves can be obtained by dividing the actual spreading time of the ultrasonic waves in the static speed pipe by the sonic path distance, flow speed of the to-be-tested gases in the measuring pipe can be obtained by substituting the obtained spreading speed Cf of the ultrasonic waves into a calculation equation, and the flow of the to-be-tested gases can be obtained. By the method and the device for detecting the ultrasonic flow by the time-difference method, online detection of the spreading speed of the ultrasonic waves can be realized, and measuring accuracy can be improved.

Description

technical field [0001] The invention belongs to the technical field of gas flow measurement, and in particular relates to a time-difference method ultrasonic flow detection method and device. Background technique [0002] Ultrasonic flow measurement technology is a measurement technology that uses the flow velocity information of the fluid when the ultrasonic signal propagates in the fluid to measure the fluid flow. It has the characteristics of non-contact measurement, high measurement accuracy, wide measurement range, and convenient installation and maintenance. According to the principle of signal detection, the current time difference method ultrasonic flow detection device can be roughly divided into time difference method, frequency difference method, beam shift method, Doppler method and other types, among which the flow detection device based on time difference method is the most widely used. [0003] In fact, because the ultrasonic signal in the fluid medium is comp...

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Problems solved by technology

[0010] The purpose of the present invention is to provide a time-difference method of ultrasonic flow detection method to solve the problem that in the prior art, it is necessary to perform compensation calculations for various environmental factors in order to obtain the real ultrasonic propagation speed C in the fluid medium. f And influence the technical problem of measurement accuracy; Simultaneously, the present invention also provides a kind of time-difference method ultrasonic flow detection device for implementing above-mentioned detection method

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