COMPARISON OF THE INSPECTIONS OF SMOOTH AND ROUGH CRACK-LIKE DEFECTS USING ULTRASONIC ARRAYS

The use of ultrasonic arrays to detect crack‐like defects is an important area in nondestructive evaluation. The array data, which contains scattered ultrasonic waves from a scatterer, can be used to reconstruct a high resolution image, e.g., using the total focusing method (TFM). In this paper, the TFM images from smooth and rough crack‐like defects are compared. It is shown that roughness can be either beneficial or detrimental to the detectability of crack‐like defects.