Showing papers by "Satoshi Nagai published in 1986"

Ultrasonic flaw detection method and apparatus

Abstract: PROBLEM TO BE SOLVED: To enable not only detection of flaw of the whole of a target region to be inspected but also measurement of the dimension of the whole of the target region to be inspected at a high speed with high accuracy, by electronic scanning different from flaw detection using a conventional TOFD method, an once-reflection method or an array type ultrasonic probe of pair constitution and requiring no mechanical scanning. SOLUTION: One or more of the vibrators of the array type ultrasonic probe 2, which has an integrated structure where a plurality of vibrators are continuously arranged, is selected as an ultrasonic transmitting vibrator. The other one or more of them is selected as an ultrasonic receiving vibrator for receiving the diffracted or reflected waves of the ultrasonic waves transmitted from the ultrasonic transmitting vibrator. The ultrasonic transmitting vibrator and the ultrasonic receiving vibrator are arranged at the positions on both sides of the surface of the array type ultrasonic probe, and in such a state, that the array-type ultrasonic probe is fixed, flaw detection is performed by the electronic scanning of the ultrasonic transmitting vibrator and the ultrasonic receiving vibrator corresponding thereto.