| 摘要 |
PROBLEM TO BE SOLVED: To provide an electromagnetic ultrasonic measuring device capable of measuring a material thickness and a stress inexpensively in a short time. SOLUTION: An ultrasonic wave is generated on the surface of a measuring object plate. In this case, sound velocity of a transversal wave or a longitudinal wave is assumed (S11). The waveform of a received resonance spectrum is calculated (S12), and, first of all, the plate thickness is calculated (S13). Then, the sound velocity is calculated based on the plate thickness (S14). Acoustic double refraction B or a sound velocity ratio R is determined based on the calculated sound velocity. The stress is calculated based on the determined acoustic double refraction B or sound velocity ratio R (S15). Thereafter, the determined plate thickness and stress are displayed on a display part (S16). COPYRIGHT: (C)2009,JPO&INPIT
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