| 摘要 |
An ultrasonic flowmeter includes two ultrasonic transceivers ( 10, 16 ). Each of the ultrasonic transceiver ( 10, 16 ) includes a transmitting body ( 1; 12 ) fixed to the outer peripheral surface of a measurement pipe ( 6 ) through which a fluid to be measured flows so as to surround the measurement pipe ( 6 ), and an ultrasonic transducer ( 2; 13 ) spaced from the outer peripheral surface of the measurement pipe ( 6 ). The transmitting body ( 1 ) has axial end surfaces ( 8 a, 8 b) perpendicular to the axis of the measurement pipe ( 6 ). An axial end surface ( 7 ) of the ultrasonic transducer ( 2 ) is fixedly secured to the axial end surface ( 8 b) of the transmitting body ( 1 ), and the ultrasonic transducer ( 2 ) is extended and contracted in the axial direction by applying a voltage between the axial end surfaces ( 8 a, 8 b) of the ultrasonic transducer ( 2 ).
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