Patent ID: 9347810
Filing Date: 2016-05-24
CPC Classification: G01F

Claim Text:
1. A flow rate measurement method comprising at least one of: (a) repeating, a predetermined number of times, (1) a step of transmitting an ultrasonic wave into a fluid pulsatingly flowing through a flow passage, receiving the ultrasonic wave, and recording an ultrasonic wave transmission and receipt-indicative signal indicative of transmission and receipt of the ultrasonic wave, and (2) a step of recording a timing signal indicative of a timing at which the transmission and receipt of the ultrasonic wave have been performed, or (b) repeating, the predetermined number of times, (1) a step of transmitting a timing signal at a predetermined timing, and (2) a step of, in response to the transmitted timing signal, transmitting the ultrasonic wave into the fluid pulsatingly flowing through a flow passage, receiving the ultrasonic wave, and recording an ultrasonic wave transmission and receipt-indicative signal indicative of the transmission and receipt of the ultrasonic wave; and the method further comprising: determining flow rates corresponding to at least part of the ultrasonic wave transmission and receipt-indicative signals based on the at least part of the recorded ultrasonic wave transmission and receipt-indicative signals; determining ultrasonic wave transmission and receipt timings corresponding to at least part of the timing signals based on the at least part of the timing signals; and composing a pulsating fluctuation in flow rate of the fluid based on the determined respective flow rates and the determined respective transmission and receipt timings.