PROBLEM TO BE SOLVED: To increase ultrasonic detection sensitivity and the accuracy of soundness evaluation when detecting an ultrasonic wave using an ultrasonic wave measuring apparatus having a fiber Bragg grating (FBG) as a sensor by devising a method for attaching the grating as a sensor section to the test subject.;SOLUTION: In contrast to a conventional example, as shown in (a) of the figure, a method in which the grating 8 as a sensor section of an FBG sensor 5 adheres in its entirety to the test subject 9 perfectly (referred to as "perfect adhesion") is adopted, the present invention adopts a method, as shown in (b) of the figure, in which only the parts apart from the both ends of the grating 8 of the FBG sensor 5 toward the both sides adhere to the test subject 9 (referred to as "bridge adhesion"), allowing the ultrasonic detection sensitivity of the FBG sensor 5 to be improved.;COPYRIGHT: (C)2006,JPO&NCIPI
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