超声导波谐振式传感器驱动电路设计  

Design of driving circuit for ultrasonic guided wave resonant sensor

作　　者：张晓娜 杨录[1] 田力 高斌 Zhang Xiaona;Yang Lu;Tian Li;Gao Bin(State key Laboratory of Electrical Testing,Institute of Information and Communications Engineering,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学信息与通信工程学院电子测试国家重点实验室,太原030051

出　　处：《国外电子测量技术》2021年第4期87-92,共6页Foreign Electronic Measurement Technology

摘　　要：为了精确、快速测量超声导波谐振式传感器在外界环境影响下的频率变化,利用超声导波谐振式传感器的远端谐振特性,设计了一种谐振频率自动跟踪驱动电路。通过跟踪谐振器辐射信号和振荡源信号之间的周期差,建立了环路积分控制模型;选择铁铬合金丝制作了一种半波长导波谐振传感器,通过高温实验验证了电路的可行性同时获得了传感器的温度频率特性曲线,结果表明,该电路可以实现超声信号发射、超声回波信号的采集和谐振频率的自动跟踪,为超声导波谐振传感器的研制和应用开拓了一条途径。In order to accurately and quickly measure the frequency change of the ultrasonic guided wave resonant sensor under the influence of the external environment,a resonant frequency automatic tracking drive circuit is designed by using the remote resonance characteristics of the ultrasonic guided wave resonant sensor.By tracking the period difference between the resonator radiation signal and the oscillation source signal,a loop integral control model was established;a half-wavelength guided wave resonant sensor was made by selecting Fe-chromium alloy wire,and the feasibility of the circuit was verified by high-temperature experiments.The temperature-frequency characteristic curve of the sensor is obtained,and the results show that the circuit can realize ultrasonic signal transmission,ultrasonic echo signal acquisition and automatic tracking of resonant frequency,which opens up a way for the development and application of ultrasonic guided wave resonant sensors.

关 键 词：超声导波 谐振传感器 频率跟踪 

分 类 号：TB559[理学—物理]