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Design of ultrasonic distance measuring system with transmitting-receipting sensor

XIAO Jun, NIU Wei, MO Yi-min, ZHAO Gang(Sch of Mech and Elec Engin,Wuhan University of Technology, Wuhan 430070,China)  
An ultrasonic distance measuring system with a transmitting-receipting sensor is introduced.It consists of transmitting circuit, preamplifier, filter, AGC, shaping circuit and MCU, etc.The preamplifier consists of the audio-frequency power amplifier LM386.Moreover,a method of detecting reflected peak value is used on data collecting and processing good results have been achieved.
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