| 摘要 |
An apparatus and a method for acoustic wave measurement according to the present invention are characterized by oscillating a magnetostrictive vibrator with a frequency to emit an acoustic wave to an object to be measured, calculating the amplitude of a signal received by a wave receiver, and repeating the previous steps throughout a range of different frequencies to detect the resonance frequency. The amplitude of the received signal is calculated from values of the signal sampled at an interval of +E,fra 1/4+EE of one cycle of the emitted frequency. This reduces the time of the measurement of a thickness a presence of flaws, a presence of impurities and minimizes noises during the measurement.
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