ULTRASONIC FLOW RATE MEASURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a measuring method of ultrasonic flow rate being able to more accurately specify the arrival timing of an ultrasonic and then ensure an adequate measurement accuracy. SOLUTION: In the ultrasonic flow rate measuring method, each ultrasonic transducer 2, 3 is positioned opposite to upstream and downstream sides of fluid to be measured, respectively, these ultrasonic transducers 2 and 3 mutually generate and transmit an ultrasonic as well as receiving the transmitted ultrasonic each other to measure flow rate of the fluid based on the propagation time of respective ultrasonic obtained from each received wave. The point in time when maximum half-wave Wp of the above received wave W has reached a reference voltage value E is defined as the arrival timing of the ultrasonic.