| Range compensation function for echo integration in transducer near fields, with special reference to parametric sonar. | |
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MedLine Citation:
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PMID: 19355429 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Range compensation functions are applied to echo signals so that the corresponding range-compensated echo intensity equals the volume backscattering coefficient to within a multiplicative constant. For echo integration in a transducer far field, the transmit and receive pressure fields each decrease inversely with range r, and the well-known range compensation function, applied to intensity, is r(2)x10(alphar5), where alpha is the absorption coefficient. For echo integration in a transducer near field, the range compensation function is that of the far field modified by a multiplying factor. This factor is, approximately, the ratio of the square of the surface integral of the field intensity at r due to extrapolation from the far field, assuming inverse range dependence of the amplitude, to the product of the surface integrals of transmit and receive intensities at r. This general range compensation function is developed for the special case of echo integration with a parametric sonar in which scatterers are ensonified in a region where the nonlinearly generated difference-frequency field is growing and echoes are received in the far field of a collocated, linearly operating transducer. It is evaluated numerically for the Kongsberg TOPAS PS18 parametric subbottom profiling sonar, with primary-frequency band 15-21 kHz and difference-frequency band 0.5-6 kHz. |
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Authors:
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Kenneth G Foote |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Journal of the Acoustical Society of America Volume: 125 ISSN: 1520-8524 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2009 Apr |
Date Detail:
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Created Date: 2009-04-09 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7503051 Medline TA: J Acoust Soc Am Country: United States |
Other Details:
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Languages: eng Pagination: 2719 Citation Subset: IM |
Affiliation:
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Woods Hole Oceanograph. Inst., Woods Hole, MA 02543, kfoote@whoi.edu. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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