Measuring and testing – Vibration – By mechanical waves
Patent
1979-10-22
1981-02-10
Kreitman, Stephen A.
Measuring and testing
Vibration
By mechanical waves
73602, 73659, G01N 2900
Patent
active
042494214
ABSTRACT:
The shear absorption of a viscoelastic material is determined by directing acoustical energy at the viscoelastic material and sampling the backscattered signals that result when compressional waves propagate through the material and are scattered by either a fluid-filled or evacuated cavity contained therein. The backscattered signals are converted to a resonance amplitude versus frequency domain and the shear absorption of the viscoelastic material is determined from the frequency and the half-width of the resonance peaks.
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G. Gaunaurd et al.; "New Method to Determine Shear Absorption using Visco Elasto Dynamic Resonance-Scattering Formalish,"Journal of Acoustical Society of America, vol. 64, No. 4, pp. 1211-1212, Oct. 1978.
G. Gaunburd et al., "Giant Monopole Resonances in Scattering Waves from Gas Filled Cavities and Bubbles," J. Acoust. Soc. Am., vol. 65, No. 3, pp. 573-594, Mar. 1979.
berall Herbert M.
Gaunaurd Guillermo C.
Scharnhorst Kurt P.
Branning A. L.
Kreitman Stephen A.
Lashmit D. A.
Sciascia R. S.
The United States of America as represented by the Secretary of
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