逆散乱解析法の超音波フェーズドアレイ探傷への応用

抄録

Phased array transducer has an advantage of transmitting ultrasonic beams to various directions from a fixed position. In this study, we propose a new flaw imaging technique based on linearized inverse scattering methods. Here incident waves of strong intensity are generated in specified directions by a beam steering technique of the phased array transducer, and scattered waves are received simultaneously at each array element on a flat surface of a specimen. Since the data processing in our methods is performed by means of 2-D FFT, high-speed imaging of flaw shapes is possible with a portable computer. From numerical simulations by BEM, these imaging methods show reasonable resolution to evaluate flaw shapes if ultrasonic beams are transmitted in several directions.