System and method for measuring ultrasonic flight time in pipeline

Abstract

The invention provides a system and method for measuring ultrasonic flight time in a pipeline. The system comprises a microcontroller module, an ultrasonic flight time measurement module, an ultrasonic drive boosting module, an echo signal A / D conversion module and an ultrasonic sensor. The ultrasonic flight time measurement module comprises an ultrasonic analog front end and a time-to-digital converter. In a first measurement stage, the amplification gain of the ultrasonic analog front end is adjusted according to an echo signal until n peak values of a digital signal read after an ultrasonicwave is re-sent and received are all greater than a preset threshold value, wherein n is a positive integer; and in a second measurement stage, timing is conducted on ultrasonic wave sending and echoreceiving through the time-to-digital converter to obtain the ultrasonic flight time. The system and the method can realize automatic gain adjustment so as to adapt to measurement of ultrasonic flight time in different pipeline fluids.

Description

technical field [0001] The invention relates to the technical field of ultrasonic measurement, in particular to a system and method for measuring the time-of-flight of ultrasonic waves in pipelines. Background technique [0002] The principle of ultrasonic sensor to generate ultrasonic waves: the transmitting probe contains piezoelectric material, and the piezoelectric material will vibrate when it receives the electric pulse excitation, and the vibration will generate ultrasonic waves, that is, the function of the transmitting probe is to convert electrical energy into sound energy. The principle of ultrasonic reception is that when the piezoelectric material in the receiving probe receives ultrasonic waves, it will generate a voltage, that is, convert the sound energy into electrical energy, and the received electrical energy is very convenient for the next step. That is, piezoelectric materials will generate ultrasonic waves when they are acted on by electric signals, and...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a system and method for measuring the ultrasonic time-of-flight in the pipeline, so as to solve the problem that the existing measurement method of the ultrasonic time-of-flight cannot adapt to the different attenuation of the ultrasonic waves propagated in different pipelines, which causes the measurement process to be manually adjusted. measurement problem

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