| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultrasonic flowmeter improved in measuring precision, compared with one in the prior art, and a manufacturing method therefor. SOLUTION: In this ultrasonic flowmeter 10 of the present invention, a multicylindrical part is constituted of the first cylindrical body 12A, the second cylindrical body 13A, and a multiplex pipe 30 to extend a propagation distance of a casing propagation wave, and the casing propagation wave propagated through a meter housing 11 is received by an ultrasonic sensor 20 in a reception side, with a time lag from an ultrasonic wave (fluid propagation wave) propagated through a fluid. The casing propagation wave may be attenuated until it reaches the ultrasonic sensor 20 in the reception side. In addition, a sensor-to-sensor distance L1 is never fluctuated, because the first housing 12 is coupled to the second housing 13 by the multiplex pipe 30. A propagation time of the fluid propagation wave is thereby measured accurately to increase the measuring precision of a flow velocity of the fluid (for example, hydrogen gas and water), or a flow rate thereof, compared with one in the prior art. COPYRIGHT: (C)2007,JPO&INPIT
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