AUTOMATIC DETECTING DISBONDS IN LAYERED STRUCTURES USING ULTRASONIC PULSE-ECHO INSPECTION

Tadeusz Stepinski and Bengt Vagnhammar

7th European Conference on Non-destructive Testing,
Copenhagen, Denmark, 26-29 May, 1998

Abstract:

A method for automatic detection of disbonds in layered structures based on time-frequency representation of the ultrasonic signals acquired during ultrasonic inspection is presented in the paper. The detection is performed by a multilayer perceptron neural network using features extracted from the time-frequency representation as inputs. The performance of the detector is demonstrated using data from the pulse-echo inspection of a multilayered aerospace structure covered with rubber.

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