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dc.contributor.authorStephen, Ralph A.  Concept link
dc.date.accessioned2008-10-14T19:17:45Z
dc.date.available2008-10-14T19:17:45Z
dc.date.issued2000-03
dc.identifier.citationJournal of the Acoustical Society of America 107 (2000): 1095-1102en
dc.identifier.urihttps://hdl.handle.net/1912/2498
dc.descriptionAuthor Posting. © Acoustical Society of America, 2000. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 107 (2000): 1095-1102, doi:10.1121/1.428399.en
dc.description.abstractGaussian beams provide a useful insonifying field for surface or interface scattering problems such as encountered in electromagnetics, acoustics and seismology. Gaussian beams have these advantages: (i) They give a finite size for the scattering region on the interface. (ii) The incident energy is restricted to a small range of grazing angles. (iii) They do not have side lobes. (iv) They have a convenient mathematical expression. The major disadvantages are: (i) Insonification of an interface is nonuniform. The scattered field will depend on the location of the scatterers within the beam. (ii) The beams spread, so that propagation becomes an integral component of the scattering problem. A standard beam parameterization is proposed which keeps propagation effects uniform among various models so that the effects of scattering only can be compared. In continuous wave problems, for a given angle of incidence and incident amplitude threshold, there will be an optimum Gaussian beam which keeps the insonified area as small as possible. For numerical solutions of pulse beams, these standard parameters provide an estimate of the smallest truncated domain necessary for a physically meaningful result.en
dc.description.sponsorshipThis work was carried out under Office of Naval Research Grant Nos. N00014-90-I-1493, N00014-96-1-0460, and N00014-95-1-0506 and under a Mellon Independent Study Award from Woods Hole Oceanographic Institution.en
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen
dc.publisherAcoustical Society of Americaen
dc.relation.urihttps://doi.org/10.1121/1.428399
dc.subjectAcoustic wave scatteringen
dc.subjectUnderwater sounden
dc.subjectAcoustic pulsesen
dc.subjectNumerical analysisen
dc.titleOptimum and standard beam widths for numerical modeling of interface scattering problemsen
dc.typeArticleen
dc.identifier.doi10.1121/1.428399


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