| 摘要 |
PROBLEM TO BE SOLVED: To easily attach a ultrasonic vibrator to a laid pipe, in an ultrasonic flowmeter which has the same method as one with annular ultrasonic vibrator. SOLUTION: Two ultrasonic transmitter/receiver are placed with a distance so as to contact the pipe of the flow path of fluid to be measured. These are mutually functioned as ultrasonic transmitter and ultrasonic receiver, and the ultrasonic flowmeter calculates flow velocity from an upstream ultrasonic transmission time and a down stream ultrasonic transmission time. Each of the ultrasonic transmitter/receiver is constituted of two semicircular ultrasonic vibrators. A tightening mechanism for surrounding the pipe and fixing the two semicircular ultrasonic vibrators is provided. The two semicircular ultrasonic vibrators fixed at each length position of the pipe vibrate with the same phase, and are electrically connected so as to output with the same phase as the vibration of the measuring pipe. COPYRIGHT: (C)2007,JPO&INPIT
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