Ultrasonic inspection

Ultrasonic inspection is a non-destructive method in which beams of high frequency sound waves that are introduced in to the material are used to detect surface and sub surface flaws. The sound waves travel through the material with some attend loss of energy and are reflected at interfaces .the reflected beams is detected and analyzed to define the presence and location of flaws. Different ultrasonic techniques are there for finding the flaws or defect in which guided waves demonstrate an attractive solution where conventional ultrasonic techniques are less sensitive to defects such as corrosion/disbands. In thin multilayered wing skin structures and hidden exfoliation under wing skin fasteners. Guided lamb waves have been used for long range or large area corrosion detection and the evaluation of adhesively bonded structure. Ultrasonic guide waves are promising but require procedure development to ensure high sensitivity and reliable transducer coupling