| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a thinning detection method for determining the presence or absence of a thinned part which has occurred in a section to be inspected even when the section to be inspected is not exposed due to a deposit such as a support member and a reinforcing member. Ž<P>SOLUTION: The thinning detection method includes a first process for arranging an ultrasonic transmission-side probe 11 and an ultrasonic reception-side probe 12 at a prescribed interval in the surface of a specimen 36 having a sound thickness of a section to be inspected 14 to receive ultrasonic waves entering the specimen 36 from the transmission-side probe 11, skipping a plurality of times in such a way as to be reflected at its back and surface, and reaching the reception-side probe 12 and to obtain echoes of a sound part; a second process for arranging the transmission-side probe 11 and the reception-side probe 12 at a prescribed interval on both sides of the section to be inspected 14 to receive ultrasonic waves entering the section to be inspected 14 from the transmission-side probe 11, skipping a plurality of times, and reaching the reception-side probe 14 and to obtain echoes of the section to be inspected; and a third process for comparing the locations of occurrence of the echoes of the sound part obtained in the first process with the echoes of the section to be inspected obtained in the second process and determining the presence or absence of a thinned part 17 which has occurred in the section to be inspected 14 on the basis of their difference. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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