A method for determining the acoustic properties of thin plates is described. Existing theoretical expressions are used to calculate transmission and reflection coefficients for sound waves striking the plates at arbitrary angles of incidence. Theory is substantiated by experimental data, and refined values for absorption coefficient and shear velocity are obtained by combining theory and experiment. Materials tested were Absonic-A, plexiglass, and polyethylene.
Measurements were made to determine the reflection and transmission coefficients of several transducer window and dome materials. The coefficients were measured as a function of incident angle in the frequency range 100–500 kc/sec. The effects of the shear component as well as the absorption of both the longitudinal and shear waves are discussed. Refined values for the magnitude of the shear velocity and the absorption can be obtained by fitting the calculated values to the experimental curves. (Work supported by the U. S. Navy Bureau of Ships.]
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