Abstract
This paper proposes an NDE ultrasonic measurement modeling based on the linear time-shift invariant system (LTI system). We here show the entire modeling of the immersion ultrasonic testing (UT), that is the ultrasonic wave generation from an immersion transducer, the flaw scattering in the solid object and the reception by the transducer. The Multi-Gaussian beam model is introduced to express the wave propagation in both transmission and reception paths, and the scattered wave from flaws is calculated by the boundary element method. The present work introduces an effective simulation of the immersion UT because each component of the LTI system is individually characterized. The performance of this modeling is shown by simulations of the scattered waveform from internal and surface-breaking cracks.
