Abstract
A method and apparatus for ultrasonic wave measurement wherein the time interval between like order echoes selected with respect to adjacent transmitted waves is controlled to be equal to an integral multiple of a period (t 3 ) of a continuous oscillation wave. In addition, the time interval between like order echoes adjacent to each other that are selected with respect to the same transmitted wave is controlled to be equal to the period (t 3 ) of the continuous oscillation wave. The period (t 3 ) of the continuous oscillation wave that is obtainable under the above controlled state, is measured, and the result of the measurement is used as ultrasonic wave propagation time for obtaining the absolute sound velocity.
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