CHANGES IN THE PROPAGATION OF ULTRASONIC-WAVES IN SILICA AEROGELS

被引：1
|
作者：
MICHARD, F
ZAREMBOWITCH, A
机构：
[1] Département de Recherches Physiques, Laboratoire Associé Au C.N.R.S. N° 71, Université P. Et M. Curie, Paris
来源：
PHYSICA STATUS SOLIDI A-APPLIED RESEARCH | 1990年 / 118卷 / 02期
关键词：
D O I：
10.1002/pssa.2211180215
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
High frequency ultrasonic waves are propagated in low density silica aerogels. Velocity and attenuation measurements are performed by using acousto‐optic interaction in Bragg regime. In the frequency range investigated, velocity measurements are in good agreement with those obtained by other techniques, static measurements and Brillouin scattering. The mean value for the attenuation coefficient α is proportional to the frequency v. This behavior evidences a change in the propagation of elastic waves between the ultrasonic regime and the Rayleigh scattering regime where α is proportional to v4. Copyright © 1990 WILEY‐VCH Verlag GmbH & Co. KGaA
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页码：461 / 465
页数：5
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