Transducer material characterization by transmission coefficient measurements

Author

Lu, X.M. ; Rhyne, T.L. ; Tea, N. ; Smith, L.S.

Author_Institution

GE Med. Syst., Milwaukee, WI, USA

Volume

2

fYear

1998

fDate

1998

Firstpage

1061

Abstract

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

Keywords

acoustic transducers; acoustic wave absorption; acoustic wave velocity; composite materials; polymers; silicon; Si; Si-epoxy 2-2 composite layer; acoustic attenuation; acoustic velocity; discontinuity; higher than desired operating frequency; phase jump; quarter shear wave resonance; quarter wave matching layer samples; quarter wavelength frequency range; transducer material characterization; transmission coefficient measurements; Acoustic measurements; Biomedical transducers; Composite materials; Frequency measurement; Impedance; Thickness measurement; Ultrasonic transducers; Ultrasonic variables measurement; Velocity measurement; Wavelength measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1998. Proceedings., 1998 IEEE

Conference_Location

Sendai

ISSN

1051-0117

Print_ISBN

0-7803-4095-7

Type

conf

DOI

10.1109/ULTSYM.1998.765011

Filename

765011