脉冲超声传感器激发／接收电路设计

摘要： 围绕磁致伸缩式超声传感器用脉冲激发／接收电路的设计，讨论了场效应功率管在脉冲超声波激发电路中的应用，重点研究了场效应管驱动电路、脉冲超声波高压激发电路及接收保护电路，并简要介绍了其余电路的实现。对研制的电路进行了性能分析，所用电子元器件均无过热现象，并获得较为理想的电脉冲信号。设计的电路板已成功用于磁致伸缩式超声传感器测量材料弹性模量。  Device　of　a　Circuit　for　Transmiting/Receiving　Ultrasonic　Pulse

FENG　Hong-liang，XIAO　Ding-guo，XU　Chun-guang，ZHOU　Shi-yuan

（Beijing　Institute　of　Technology，Beijing　100083，China）

Abstract：A　new　transmit/receive　circuit　for　magnetostrictive　ultrasonic　transducer　is　stuided.The　circuit　to　creat　high　voltage　pulse　with　MOSFET　（MetalOxideSemiconductor　type　field　Effect　Transistor）and　the　circuit　to　drive　MOSFET　are　fully　discussed.A　high　voltage　pulse　protection　circuit　is　built　in　the　receiver　amplifier　so　that　the　transducer　can　work at　pulse/echo　mode.The　other　second　circuits　are　introduced　simply.The　performance　test　of　the　circuit　showed　that　the　designed　circuit　system　is　very　suitable for　magnetostrictive　ultrasonic　transducer　to　transmit/receive　ultrasonic　pulse and　no　electronic　component　in　the　circuit　is　hotter　under　longtime　work.The　circuit　has　been　used　ultrasonically　measuring　with　a　magnetostrictive　ultrasonic　transducer　to　transmit/receive　ultrasonic　pulse　and　no　electronic　component　in　the　circuit　is　hotter　under　longtime　work.The　circuit　has　been　used　ultrasonically　measuring　with　a　magnetostrictive　ultrasonic　transducer　for　elastic　modulus　of material.

Key　Words：Ultrasonic　Pulse；Transmit/Receive；MOSFET；Driving　Circuit；High　Volt　Discharging　Circuit；Circuit　of　Input　Protection