83. High-Precision Ultrasonic Flow Measurement Based on GP22

With the extensive utilization of ultrasonic flow meters in industry and commerce, the demand of improving accuracy of measurement has become increasingly urgent. This chapter presents a new measuring tubing that is a combination of circular tube and square tube. According to the results of computational fluid dynamics (CFD) simulation and experiment, this proposed measuring tubing can produce a more even velocity distribution of liquid than the traditional circular tubing. Accompanied by the tubing, a novel high-precision ultrasonic flow-measuring circuit based on the time-digital converter (TDC) of GP22 is designed. This measuring circuit, which depends on the principle of time difference method, can not only obtain accurate measuring data of instantaneous flow after calibration but also reduce power consumption.