Identifying Surface Angled Cracks on Aluminium Bar using EMATs and Automated Computer System

Electromagnetic acoustic transducers (EMATs) have been used in pitch-catch manner to identify surface cracking in aluminium bars and rails. The differences between signal enhancement due to interference produced by normal (900) and angled cracks in B-scans were utilised to classify them in order to decide appropriate depth calibration curve for depth estimation. In addition, the B- scans were also used to determine the presence of any surface defects. The B-scans were input into image processing algorithm that select the best features and use it for training and recognising similar pattern in other B-scans.