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Wave propagation in randomly layered media with an application to time reversal

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Title: Wave propagation in randomly layered media with an application to time reversal
Author: Gonzalez del Cueto, Fernando
Advisor: Borcea, Liliana
Degree: Master of Arts thesis
Abstract: We describe the propagation of acoustic waves through randomly layered media over distances much larger than the typical wavelength of a pulse that is emitted from a point source. The layered medium is modeled by a smooth reference background modulated by fast random small-scale variations. Using asymptotic methods, we arrive to the O'Doherty-Anstey (ODA) formula which describes the coherent part of the pulse in a deterministic expression up to a small random time correction. An application on time-reversal is presented, where a pulse is sent through the medium, recorded in a small window, time-reversed, and then sent back towards the source. The striking phenomenon of enhanced refocusing occurs, where the randomness in the medium actually improves the spatial refocusing around the initial source.
Citation: Gonzalez del Cueto, Fernando. (2005) "Wave propagation in randomly layered media with an application to time reversal." Masters Thesis, Rice University. http://hdl.handle.net/1911/17785.
URI: http://hdl.handle.net/1911/17785
Date: 2005

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