Finite Difference Modeling of Phased Array Ultrasonic Testing and its Application to the Identification of Mode Conversion

The phased array ultrasonic testing model is built based on finite difference method, and the acoustic field of PA probe and the echo of different defects are calculated, the model is validated by mean of the experiment results of notch, a three peaks echo is achieved on a slit notchblock and the model is used to analyze the reason of every echo and the result indicates that numerical modeling of ultrasonic testing is an efficient tool for identification of mode conversion.