| 摘要 |
PROBLEM TO BE SOLVED: To perform most suitably material measurement or internal stress measurement inside a measuring object, by accurately measuring the sound velocity distribution of ultrasonic waves inside the measuring object. SOLUTION: The average sound velocity in the thickness direction Y of a measuring plate 101 is measured by an average sound velocity measuring means 10, the sound velocity near the surface of the measuring plate 101 is measured by a surface sound velocity measuring means 20, and the position of an extreme value of the sound velocity in the thickness direction Y of the measuring plate 101 is calculated by an extreme value position calculation means 30, based on the measured average sound velocity V in the thickness direction Y and the sound velocity near the surface. Then, the sound velocity distribution of the ultrasonic wave in the thickness direction Y of the measuring plate 101 is calculated by a sound velocity distribution calculation means 40, based on the calculated position of the extreme value of the sound velocity. COPYRIGHT: (C)2007,JPO&INPIT
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