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Transducer-modeling in general transversely isotropic media via point-source-synthesis: theory

Prüfkopf-Modellierung in allgemeinen transversal-isotropen Medien mittels Punktquellensynthese: Theorie
: Spies, M.


Journal of Nondestructive Evaluation 13 (1994), Nr.2, S.85-99
ISSN: 0195-9298
ISSN: 1573-4862
Fraunhofer IZFP ()
Anisotropie; anisotropy; point-source synthesis; Prüfkopfmodellierung; Punktquellensynthese; radiation characteristic; transducer modeling; Ultraschallprüfung; ultrasonic testing

Based on a theory of elastic wave propagation in arbitrarily oriented trasnversely isotropic media, which has been presented recently, the radiation characteristics of ultrasonic transducers in these media has been determined. Using the directivity patterns for normal and transverse point sources on the free surface of such (semi-infinite)materials -the derivation is based on the reciprocity theorem- the radiated wave fields are obtained by the method of point-source-synthesis, i.e., by superposing the wave fields of numerous point sources located within the transducer aperture. Focusing on trasnversely isotropic weld material specimens, numerical evaluation is performed for several grain orientations with respect to the trasnducer-normal. The approach presented is particularly useful in view of an appropriate extension to inhomogeneous welds and the consideration of time-dependent RF-impulse functions.