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Observation of a coherent backscattering effect with a dipolar source for elastic waves: highlight of the role played by the source | | J de Rosny
; A Tourin
; M Fink
; | | Date: |
30 Nov 2001 | | Journal: | Phys Rev E, 64 (6 Pt 2), 066604 | | Abstract: | We report an experimental evidence of the role played by the source on the coherent backscattering effect (CBE) for elastic waves. The experiment is carried out in a chaotic cavity consisting of a silicon plate whose shape is a quarter stadium. With a monopolar source, it has already been shown that the time-integrated squared amplitude at the point source is twice as large as at the other points around the source. Here, by using a dipolar source, we show that we instead obtain two peaks with the same axis as the dipole one’s. The shape of this "bicone" is well explained with a modal theory assuming that the source may be modeled by two sources with opposite phases. Then, the theory is generalized to any multipolar emitter and/or receiver. Particularly, we study CBE when emitter and receiver are reciprocal. | | Source: | PubMed, pmid11736293 | | Services: | Forum | Review | Favorites | |
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