Measurement of tortuosity of anisotropic acoustic materials
作者:
Manuel Melon,
Denis Lafarge,
Bernard Castagne`de,
Niven Brown,
期刊:
Journal of Applied Physics
(AIP Available online 1995)
卷期:
Volume 78,
issue 8
页码: 4929-4932
ISSN:0021-8979
年代: 1995
DOI:10.1063/1.359781
出版商: AIP
数据来源: AIP
摘要:
Tortuosity, i.e., the high‐frequency limit of the squared propagation index, has been evaluated with narrow‐band piezoelectric transducers on reticulated plastic foams. The basic procedure was recently reported by J. F. Allard, B. Castagne`de, M. Henry and W. Lauriks [Rev. Sci. Instrum.65, 754 (1994)]. Further experimental work related to the anisotropic nature of these materials has been done by probing the propagation index versus angle. A simple numerical routine has been implemented in order to recover the propagation index along principal directions. These predicted values compare well with measurements taken directly along the principal geometric axes of the samples. Slight angular deviations of the principal axes themselves have been observed. This is the very first account of the anisotropy of tortuosity measured by ultrasonic methods in air‐saturated porous materials. ©1995 American Institute of Physics.
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