| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an ultrasonic inspection method which simply and accurately measures a thickness in the case in which a crystal grain constituting a metal solidification structure such as a unidirectional solidification material cast product has statistical variation. <P>SOLUTION: Two ultrasonic probes 102B1 and 102B2 for transmission and reception face to each other in a direction parallel to a crystal growth direction, and make longitudinal ultrasonic waves propagate in an oblique direction with respect to a specimen 101. This makes ultrasonic waves 104" and 104B" incident on the specimen 101 composed of a crystal structure having acoustic anisotropy to measure the thickness of the specimen based on the acoustic velocity and the propagation time of the ultrasonic waves propagating in the specimen. <P>COPYRIGHT: (C)2012,JPO&INPIT |
