ULTRASONIC FLOW MEASUREMENT METHOD AND APPARATUS BASED ON SIDE-TONE PHASE MEASUREMENT

摘要

An ultrasonic flow measurement method and apparatus based on side-tone phase measurement; on the basis of a fluid flow rate estimate, obtaining a minimum side-tone frequency with a difference between the phase variation of the ultrasonic wave transmission in the fluid along the countercurrent direction and the phase variation along the downstream direction not exceeding 180° (S101); on the basis of the minimum side-tone frequency, selecting at least one group of side-tone frequencies (S103); on the basis of the measurement phase difference between the phase variation of the ultrasonic wave transmission in the fluid along the countercurrent direction and the phase variation along the downstream direction in each group of side-tone frequencies, acquiring the actual phase difference corresponding to said group of side-tone frequencies (S105); and on the basis of any one group side-tone frequencies and the actual phase difference corresponding to said group of side-tone frequencies, calculating the fluid flow (S107); thus solving the problem in the prior art of slow flowmeter response caused by the need for multiple numbers of side-tones, improving flowmeter response speed and reducing the system design complexity.