ULTRASONIC FLOWMETER AND WEDGE FOR USE IN ULTRASONIC FLOWMETER

摘要

An ultrasonic flowmeter contributive to more accurate measurement of flow rate even when the surface temperature of piping is high. An ultrasonic transmission means and a means for receiving an ultrasonic echo are formed integrally into a transducer (20). A wedge (30) for securing the ultrasonic transmission means (transducer (20)) to the outer wall surface of fluid piping (10) concerning fluid (11) to be measured is provided, and that wedge (30) is formed by sintering and molding graphite. Distance from the outer wall surface to the inner wall surface of the fluid piping (10) is equal to integral multiples of the half wavelength of incident ultrasonic wave, and the distance from the transducer (20) to the outer wall surface of the fluid piping (10) in the wedge (30) is equal to integral multiples of the half wavelength of incident ultrasonic wave.