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- W1918152704 abstract "When sound is projected into the ocean, the backscattered signal may provide information about the object(s) from which the sound has scattered. When the backscattered sound comes from an aggregation of strong scatterers, such as a school of fish at their swim-bladder resonance frequency, a phenomenon called Coherent Backscatter Enhancement (CBE) may occur, and this phenomenon could aid in discriminating fish schools from other similar-strength scatterers in the ocean water column. When CBE occurs, the addition of in-phase scattered waves from propagation path pairs produces a scattered field intensity enhancement of as much as two in the direction opposite to that of the incident wave. This presentation describes the results of CBE simulations of spherical aggregations of scatterers based on the Foldy (1945) equations, and provides comparisons to backscattering from single perfectly reflecting spheres. Interestingly, a spherical aggregation of 4200 strong scatterers with wave number scaled radius ka = 32 may provide backscattering equivalent to that from a single larger perfectly-reflecting sphere with ka = 53. Additional simulation comparisons involving the statistics and time histories of harmonic and frequency sweep incident waves are shown. [Work supported by the Office of Naval Research and by Advanced Research Computing at the University of Michigan.]" @default.
- W1918152704 created "2016-06-24" @default.
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- W1918152704 date "2015-09-01" @default.
- W1918152704 modified "2023-09-26" @default.
- W1918152704 title "Comparisons between a spherical aggregation of scatterers, and hard and soft spheres using single-frequency and pulsed signals" @default.
- W1918152704 doi "https://doi.org/10.1121/1.4934097" @default.
- W1918152704 hasPublicationYear "2015" @default.
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