超声波流量计的阻抗匹配设计

doi:10.16180/j.cnki.issn1007-7820.2025.03.009

Abstract

Abstract:

To improve the measurement accuracy of ultrasonic flow meters,it is necessary to match the impedance of excitation signal source and ultrasonic piezoelectric transducer. However, the existing impedance matching devices of ultrasonic piezoelectric transducers not only rely on imports but also have the disadvantages of poor operation and flexibility. In order to meet the requirements of low manufacturing, maintenance cost and convenient operation, two impedance matching circuits of series inductor and parallel inductor are designed in this study. An analog switch circuit is designed to realize the transmission and reception control of ultrasonic signals, a signal amplifier circuit is responsible for the amplification of ultrasonic signals, and a single-chip microcomputer is used to realize channel switching of the analog switch circuit and data collection of ultrasonic propagation time. The simulation results show that the series inductor impedance matching optimizes the input signal waveform and improves the driving efficiency of the ultrasonic piezoelectric transducer. The experimental results show that after the series inductor impedance matching, the ultrasonic propagation time data measured by the microcontroller is advanced by 50 μs, the accuracy of the ultrasonic wave propagation time is improved. But the internal resistance of the excitation signal source is small, and the parallel inductance impedance matching effect is not good.

Key words: gas flow measurement, ultrasonic transit-time difference method, piezoelectric transducer, impedance matching, equivalent circuit, resonant frequency, measurement precision, signal analysis

CLC Number:

TN64

FU Yihui, LIU Yu, XIAO Hanlin, WANG Mingjie. Design of Ultrasonic Piezoelectric Transducer Impedance Matching[J].Electronic Science and Technology, 2025, 38(3): 68-74.

Figures/Tables 17

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References 18

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引脚电平	通道选择	说明
100	A₀	A路连接A₀通道
101	A₁	A路连接A₁通道
11x	A₂	A路连接A₂通道
000	B₀	B路连接B₀通道
001	B₁	B路连接B₁通道
01x	B₂	B路连接B₂通道

温度/℃	匹配后时间/μs
31	172.42	198.62	223.42	248.62	273.42	298.72
31	172.10	198.70	223.30	248.70	273.32	298.82
31	173.05	198.52	223.02	248.62	273.30	298.95
31	173.25	198.55	223.07	248.55	273.42	298.72
31	172.25	198.52	223.37	248.72	273.35	298.75

温度/℃	匹配后时间/μs
31	222.39	248.61	273.35	298.62	323.37	348.76
31	222.12	248.67	273.27	298.71	323.36	348.82
31	223.08	248.44	273.07	298.62	323.32	348.95
31	223.21	248.48	273.02	298.55	323.45	348.74
31	222.20	248.57	273.47	298.77	323.37	348.75

Design of Ultrasonic Piezoelectric Transducer Impedance Matching

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