| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of constants to be obtained, in advance, in a device for measuring the flow velocity of fluid. SOLUTION: A control/operation unit 28 obtains a difference between time from transmission of ultrasonic waves from a first ultrasonic vibrator 10 to reception of the ultrasonic waves by a second ultrasonic vibrator 14 and the time from transmission of ultrasonic waves from the second ultrasonic vibrator 14 to reception of the ultrasonic waves by the first ultrasonic vibrator 10 as timeΔ. The control/operation unit 28 finds the flow velocity of fluid based on the timeΔ; a propagation speed c3 of ultrasonic waves in liquid; a propagation directionθ3 of ultrasonic waves in liquid; and width D of the fluid channel, in a section including a propagation path of ultrasonic waves in a fluid. COPYRIGHT: (C)2011,JPO&INPIT |
