自动增益电路在超声波测距系统中的应用研究  

Application & Research of Auto-Gain Circuit in Ultrasonic Place Measurement System

作　　者：曾祥进[1] 王敏[1] 黄心汉[1] 

机构地区：[1]华中科技大学控制科学与工程系,湖北武汉430074

出　　处：《测控技术》2005年第7期69-71,共3页Measurement & Control Technology

摘　　要：介绍了一种基于单片机的超声波测距系统,应用场效应管的可变电阻功能,设计了一种自动增益电路来对超声波的声波衰减进行补偿,给出了自动增益电路原理图,并分析和实验了其功能,实验结果验证了设计的自动增益电路具有线性度高、电路简单以及动态性能好等优点,较好地改善了超声波声强与测距精度随距离远近变化大的缺点,并减小了超声波探头的测量盲区。A system of ultrasonic place measurement based-on microcontroller is presented,and an auto-gain circuit is designed,which depend on the changeable resistance function of the field effect tube,to offset attenuation that transmit process of ultrasonic.Besides,the schematic circuit of the auto-gain circuit is provided,and its functions are analyzed and tested.The results of experiment show that auto-gain circuit has many merits.In addition,the shortage that ultrasonic intensity has a distinct change going with place move is improved,as well as blind field of the measurement is cut down.

关 键 词：超声波测距系统 自动增益电路 应用 电路原理图 超声波探头 可变电阻 场效应管 声波衰减 动态性能 测距精度 单片机 线性度 设计 实验 

分 类 号：TP242.6[自动化与计算机技术—检测技术与自动化装置] TP274.5[自动化与计算机技术—控制科学与工程]