NDTnet - November 1996, Vol.1 No.11

MATERIAL SURFACE CHARACTERIZATION BY A RAYLEIGH VELOCITY MEASUREMENT

By F. Tardy, M.H. Noroy, L. Paradis, J.C. Baboux

Abstract

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.

V(Z) TECHNIQUES IN BROADBAND MODE:

MODELING:

EXPERIMENTAL PROCEDURE:

CONCLUSION:

REFERENCES:


Authors

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

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    Rolf Diederichs 1.Nov 1996, info@ndt.net
    /DB:Article /SO:DGZfP /AU:Tardy_F /AU:Noroy_M_H_ /AU:Paradis_L /AU:Baboux_J_C /CT:UT /CT:Rayleigh /CT:characterization /ED:1996-11