Multi-pattern adaptive inverse filter for real-time deconvolution of ultrasonic signals in scattering media

This work provides a method for real-time deconvolution, which considers the signal distortion of the ultrasonic (UT) wave-front travelling in dispersive materials. The deconvolution method is based on an inverse filter, whose coefficients are computed by an adaptive algorithm from a set of pattern signals scanned at different depths of the tested material. Several experiments carried out on aeronautic composite laminates show that a valuable improvement of axial resolution is obtained at the different depths of the test piece. (C) 1999 Elsevier Science S.A. All rights reserved.