| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultrasonic flowmeter capable of absorbing pulsation without modifying the conventional ultrasonic flowmeter. SOLUTION: The ultrasonic flow meter comprises a measurement tube 6 with a predetermined thickness arranged so that fluid adheres to the inside wall of the passage in which the fluid flows, and a pair of transmitter-receivers 5, 5 arranged so that ultrasonic waves propagate in the measurement tube crossing the central axis of the measurement tube, and then receives ultrasonic waves between a pair of the transmitter-receivers and measures propagation times of the ultrasonic waves in the forward and reverse directions of the fluid flow and thus the flow rate of the fluid, based on the difference between the propagation times that are measured, is calculated. The length of the measurement tube 6 is made 300 times of the wavelength of the ultrasonic waves or less, which are transmitted and received between a pair of the ultrasonic transmitter-receivers 5, 5. COPYRIGHT: (C)2008,JPO&INPIT
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