超声波多普勒流量计换能器的研究与应用

Investigation and application of transducer of ultrasonic Doppler flowmeter

以多普勒效应为基础,进行超声波换能器设计方法和参数选择研究,设计出适用于多普勒流量计的超声波换能器。结合多普勒效应,介绍了超声波多普勒流量计的原理和超声波换能器结构,分析了超声波在管道中的传播过程、换能器等效电路及其材料选择,进而通过计算得到换能器尺寸以及发射角度等参数,根据这些技术参数,进行换能器设计。对超声波换能器进行测试,配以适当的收发电路,得到谐振频率、等效电路的基本参数,收发信号的幅度有所提高,达到流量测量要求。

This paper presents the design method for ultrasonic transducer and research of parameter selection that based on the Doppler effect,to design the ultrasonic transducer which is suitable for the Doppler flowmeter.This paper introduces the principle of ultrasonic Doppler flowmeter and the structure of ultrasonic transducer base on Doppler effect,and analyzes the transmission of ultrasonic in pipes,equivalent circuit of transducer and selection of materials,and then,calculating the parameters of transducer,such as size and emission angle,according to the this technical parameters,designs the ultrasonic transducer.To obtain the resonance frequency,the basic parameters of the equivalent circuit,testing ultrasonic transducer with appropriate transceiver circuit,the amplitude values of the received signal and emission signal have been improved,realize the requirements of the flow measurement.