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

Abstract

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.

Numerical simulation of flow velocity measurement in mono/cross sound roads by time difference method

“…Xia Zhou [7] proposed a dry calibration method for a multi-acoustic path TDOA ultrasonic flowmeter and established a standard experimental platform, which better solved the calibration problem of a large caliber ultrasonic flowmeter. Lv Cheng [8] proposed a flowmeter system design based on ATMEGA single chip and high-precision timing chip TDC-GP22 based on the principle of TDOA and highprecision design concept. Zhang Yao [9] and others proposed a design scheme for the TDOA ultrasonic flowmeter based on the pulse group correlation method in view of the low accuracy and weak antiinterference ability of the TDOA ultrasonic flowmeter in the actual industrial field environment.…”