The surface damage of materials can be
characterized by measuring the variation of the
Rayleigh wave velocity. Comparatively to the
acoustic microscopy, our technology involves the
impulse excitation of a spherical (or cylindrical)
transducer. The first section presents the principles
of the V(z) techniques in the broadband mode. In
section 2, an impulse modeling is developed and
numerical results are presented. Section 3
presents the principle of the Rayleigh-wave velocity
measurement. Non destructive machining damage
assessment on ceramic by measuring the time of
flight of the main echoes is discussed and the
frequency dependent velocity of surface wave is
demonstrated.
F. Tardy, M.H. Noroy, L. Paradis,
CEA. 91680 Bruyeres-le-Chatel, France.
J.C. Baboux,
INSA/GEMPPM. 69621 Villeurbanne cedex, France.
This paper was presented on the
World Congress on Ultrasonics, Berlin, Germany , Sept 3 - 7 1995 Contact: WCU Sectretariat, Prof. Dr. J. Herbertz, Gerhard-Mercator
University, D-47048 Duisburg, Germany. Proceedings are available