| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique which enables accurate reception detection and enhancement of measurement accuracy, even when the waveform (magnitude of the amplitude) of a received wave changes due to the kind, flow velocity, temperature, and pressure of a fluid. SOLUTION: A measuring device includes: ultrasonic transmitting and receiving elements 4 and 5, a transmitting part 6 for providing a signal to these ultrasonic transmitting and receiving elements 4 and 5; a receiving part 7 for receiving a signal from the ultrasonic transmitting and receiving elements 4 and 5; an arithmetic operation part 8 for measuring the time interval from transmission to reception and calculating a flow velocity and/or a flow rate; and the function of changing the phase and voltage of the transmission signal of the transmitting part 6. The receiving part 7 includes a detection means for detecting changes in the magnitude and width of the voltage provided by the transmitting part 6, and determines the received wave. COPYRIGHT: (C)2010,JPO&INPIT
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