Abstract：
:We perform a multiscale analysis of the backscattering properties of a complex interface between water and a layer of randomly arranged glass beads with diameter D=1 mm. An acoustical experiment is done to record the wavelet response of the interface in a large frequency range from lambda/D=0.3 to lambda/D=15. The wavelet response is a physical analog of the mathematical wavelet transform which possesses nice properties to detect and characterize abrupt changes in signals. The experimental wavelet response allows to identify five frequency domains corresponding to different backscattering properties of the complex interface. This puts quantitative limits to the validity domains of the models used to represent the interface and which are flat elastic, flat visco-elastic, rough random half-space with multiple scattering, and rough elastic from long to short wavelengths respectively. A physical explanation based on Mie scattering theory is proposed to explain the origin of the five frequency domains identified in the wavelet response.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Le Gonidec Y,Gibert Ddoi
10.1016/j.ultras.2006.05.212subject
Has Abstractpub_date
2006-11-01 00:00:00pages
381-90issue
4eissn
0041-624Xissn
1874-9968pii
S0041-624X(06)00242-3journal_volume
44pub_type
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