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Transducer material characterization by transmission coefficient measurements

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4 Author(s)
Lu, X.M. ; GE Med. Syst., Milwaukee, WI, USA ; Rhyne, T.L. ; Tea, N. ; Smith, L.S.

In transducer material characterization, quarter wave matching layer samples are often measured at higher than desired operating frequency. We describe a method for estimating both acoustic velocity and attenuation through transmission coefficient (TC) measurements of a thin layer. This method was used for characterizing a silicon-epoxy 2-2 composite layer around the quarter wavelength frequency range. The magnitude of TC for the composite agreed with prediction for a homogeneous material in the frequency range of interest. However, the measured phase showed a discontinuity (phase jump about 90°) near the quarter shear wave resonance for the epoxy

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Ultrasonics Symposium, 1998. Proceedings., 1998 IEEE  (Volume:2 )

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