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- W2006257726 abstract "This paper presents an attempt to get a deeper understanding of the high frequency and far field interferometry approach. The high frequency approximation implies a substitution of an exponential Green's function, which can be treated as the zero-order ray series term. Next terms are known to be small to have enough influence. We verified this statement for the interferometry equation. It turns out that for near field it is not entirely true. We showed that in near field the next term in inverse frequency can be significant. Its behaviour as a function of receivers-sources closeness is studied with the stationary phase method and numerical integration. Accounting for the next term in inverse frequency during the ray series substitution provides the standard cross-correlation representation plus an additional correction containing only zero-order ray series values. Calculations were carried out for parallel planes as a surface with sources in the acoustic homogeneous medium, a sphere in the same medium, and parallel planes in acoustics with a constant density and a constant gradient of velocity. In near field the standard far field term prevails but the next term correction can be significant the more the closer receivers are to the surface with sources." @default.
- W2006257726 created "2016-06-24" @default.
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- W2006257726 creator A5067813646 @default.
- W2006257726 date "2014-01-01" @default.
- W2006257726 modified "2023-09-23" @default.
- W2006257726 title "Next Term in Frequency Influence on Green's Function Retrieval for Near Field Survey" @default.
- W2006257726 doi "https://doi.org/10.3997/2214-4609.20140886" @default.
- W2006257726 hasPublicationYear "2014" @default.
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