Model-based ultrasonic inversion for layered structures

Ultrasonic problems which cannot easily be solved by the conventional methods of B- and C-scanning often benefit from the use of modelling to assist in understanding the response of the system under test. It is suggested that model-based inversion can be used to improve the resolution of ultrasonic systems, to extract information from overlapping reflections and to provide a means of classifying A scans. Although conceptually simple, the method provides a flexible means of analysing data which can incorporate any effect which can be modelled in the available computer time. The method copes well with noise and pulse shape changes