| 摘要 |
An ultrasonic measuring apparatus is provided for measuring the flow velocity of a fluid in a pipe. The apparatus includes a pair of sensors which are mounted on a pipe, and which alternately transmit and receive ultrasonic waves. When the actual sound velocity of the ultrasonic wave in the fluid is not known, a value is assumed, a flow rate is measured, correct sensor mounting positions are calculated and the actual sound velocity of the ultrasonic wave is then determined. If the assumed sound velocity differs from the calculated sound velocity by more than a predetermined amount, the assumed sound velocity is adjusted and the procedure is repeated. Therefore, even when the sound velocity of an ultrasonic wave in a particular medium is not known, an actual sound velocity can be calculated. Accordingly, the ultrasonic measuring apparatus can accurately measure the flow velocity and flow rate of a fluid.
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