超声波液位传感器功能电路设计与实现  

Design and Implementation of Ultrasonic Liquid-level Sensors Functional Circuit

作　　者：高琬佳 康建洲 薛伟钊 GAO Wanjia;KANG Jianzhou;XUE Weizhao(North University of China,Key Laboratory of Instrumentation Science&Dynamic Measurement,Ministry of Education,Taiyuan 030051,China;State Key Laboratory of Dynamic Measurement Technology,Taiyuan 030051,China)

机构地区：[1]中北大学,仪器科学与动态测试教育部重点实验室,山西太原030051 [2]省部共建动态测试技术国家重点实验室,山西太原030051

出　　处：《仪表技术与传感器》2023年第11期12-16,共5页Instrument Technique and Sensor

基　　金：国家自然科学基金青年科学基金项目(51705475)。

摘　　要：针对液位检测系统中使用的超声换能器,对其外围功能电路进行了设计及实现。电路包括发射模块、选择模块和接收模块。给出各部分的原理图设计,并将设计好的电路板进行液位检测实验,以验证电路的功能。实验结果表明:电路可输出频率为1.082 MHz、幅值为±8.8 V的连续正弦波,能激励换能器产生超声波。同时可由电路板控制换能器的收发转换以及实现接收信号的放大和检波功能。对于壁厚3 mm的铝合金容器,内部无水和有水时得到的最终读数分别为4.67 V和2.18 V。设备读数偏差<16 mV。In this paper,the peripheral functional circuit of ultrasonic transducer used in liquid-level detection system was designed and implemented.The circuit included transmitting module,selecting module,and receiving module.The schematic diagram of each part was given,and liquid-level monitoring experiments were carried out with the designed circuit board,to verify the function of the circuit.The experiment results show that the circuit board can output a continuous sine wave with a frequency of 1.082 MHzand an amplitude of±8.8 V.And it can excite the transducer to produce ultrasonic waves.The circuit board can also realize the function of the controlling transducer as the transmitter or receiver,and the function of amplification and detection of the received signal.For an aluminum alloy container with a wall thickness of 3 mm,the obtained readings are 4.67 V and 2.18 V without and with water inside,respectively.Deviation of device reading is less than 16 mV.

关 键 词：超声波 液位 振荡电路 接收电路 

分 类 号：TN98[电子电信—信息与通信工程]