The effects of finite scattering area on validity criteria for scattering models

Derek R. Olson, Anthony P. Lyons

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

The correlation length of a rough interface is often used as a criterion for the validity of many approximate scattering models such as small roughness perturbation theory or the Kirchhoff approximation. A common input to these models is the power spectrum of the surface, which usually follows a band-limited power-law form (i.e., a von Karman spectrum). The fractal-like behavior of a von Karman surface breaks down at some outer scale which is closely related to the correlation length. First-order terms in approximate scattering models will not be sufficient when interface roughness correlation lengths are much larger than an acoustic wavelength. Given that first-order perturbation theory has generally been accepted as sufficient to predict scattered levels, the use of the true geophysical correlation length as a criterion for determining the validity of scattering models is suspect. In contrast to the infinite surface assumption used in most scattering models, scattering measurements are always made on patches of finite size; results of finite transmit pulses and beamwidths. In terms of correlation length, these finite-sized patches will act to window the roughness seen by the incident acoustic pulse, possibly negating the usefulness of using the true geophysical correlation length as a validity criterion. In this work we present results of a study on the link between the behavior of seafloor roughness power spectra and the finite windows resulting from measurement systems.

Original languageEnglish (US)
Title of host publication11th European Conference on Underwater Acoustics 2012, ECUA 2012
Pages1772-1779
Number of pages8
EditionPART 3
StatePublished - Dec 26 2012
Event11th European Conference on Underwater Acoustics 2012, ECUA 2012 - Edinburgh, United Kingdom
Duration: Jul 2 2012Jul 6 2012

Publication series

Name11th European Conference on Underwater Acoustics 2012, ECUA 2012
NumberPART 3
Volume34 2

Other

Other11th European Conference on Underwater Acoustics 2012, ECUA 2012
CountryUnited Kingdom
CityEdinburgh
Period7/2/127/6/12

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics

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  • Cite this

    Olson, D. R., & Lyons, A. P. (2012). The effects of finite scattering area on validity criteria for scattering models. In 11th European Conference on Underwater Acoustics 2012, ECUA 2012 (PART 3 ed., pp. 1772-1779). (11th European Conference on Underwater Acoustics 2012, ECUA 2012; Vol. 34 2, No. PART 3).