期刊
PHILOSOPHICAL MAGAZINE
卷 86, 期 20, 页码 3043-3060出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786430600664130
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This paper is concerned with 'a probing pulse' propagating in an inhomogeneous condensed state medium. The pulse expands as it travels. This expansion may be correlated to a material-characteristic dimension-such as the size of a grain or of a free path between scattering sites or of a domain-which is a random variable with a mean denoted as g(s). Moreover, we may ascribe to the propagation a loss constant which is proportional to g(s). The process derives from the fact that, for a relatively large number of scattering sites, it is possible to model the propagation media in terms of a repetitive electrical network. The model supports a Gaussian (bell shape) impulse response and defines g(s). Both theoretical and experimental (ultrasonic) results are provided. The experimental method is relatively fast to perform and the results are highly reproducible.
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