On the width of a ray

Irina I. Rypina, Michael G. Brown

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Consistent with earlier work by Kravtsov and Orlov, a simple general expression for the width of a Fresnel zone δrF in a smooth inhomogeneous environment is derived; this is the diffractive contribution to the width of a ray. In a stratified environment at long range, the general Fresnel zone width expression is shown to reduce approximately to one that is proportional to √|α|r(R-r)/σ where α is the ray stability parameter, σ is the acoustic frequency, r is the range from the source to the field point of interest, and R is the source to receiver range. In a stratified environment on which a weak small-scale perturbation is superimposed, deterministic rays in the background environment that connect fixed end points break up into bundles of micromultipaths at moderate to long range and a second, scattering-induced, contribution δrs to the width of a ray must be considered. It is shown that δrs is proportional to |α|r(R-r) and argued that in a micromultipathing environment the total effective width of a background ray is δr tot = √δrF2 + δr s2. Theoretical predictions are shown to agree well with travel-time sensitivity kernel calculations.

Original languageEnglish (US)
Pages (from-to)1440-1448
Number of pages9
JournalJournal of the Acoustical Society of America
Volume122
Issue number3
DOIs
StatePublished - Oct 17 2007

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

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