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Based on the principle of time difference method and the design concept of high precision, the measuring principle together with the improvement of the calculation method of the time difference method were investigated, aim at the problems of high complexity of the circuit and the inadequate precision of the traditional ultrasonic flowmeter that require pipeline modification. To promote the precision accuracy of the ultrasonic flowmeter to 0.5, the function principle and its related structure of highprecision timing chip, TDC-GP22 (Time-to-Digital-Converter) were elaborated; and the design of hardware circuit and the working process of the system were introduced. The cause of signal attenuation was analyzed and the amplifying circuit for transmitting signal was designed. Finally, a flowmeter system design based on ATmega single chip and high-accuracy timing chip TDC-GP22 was proposed.

Design of High Precision Ultrasonic Flowmeter Based On TDC-GP22 and Time Difference Method