• DocumentCode
    889775
  • Title

    Three necessary conditions for the validity of the Fresnel phase approximation for the near-field beam pattern of an aperture

  • Author

    Ziomek, Lawrence J.

  • Author_Institution
    Dept. of Electr. & Comput. Eng., US Naval Postgraduate Sch., Monterey, CA, USA
  • Volume
    18
  • Issue
    1
  • fYear
    1993
  • fDate
    1/1/1993 12:00:00 AM
  • Firstpage
    73
  • Lastpage
    75
  • Abstract
    A simple, straightforward derivation of three necessary conditions that define the region of validity for the near-field directivity function (beam pattern) of an aperture (array) is presented. The derivation of all three criteria is based on determining what conditions must be satisfied in order to obtain a valid Fresnel approximation of the time-independent free-space Green´s function. Comparisons with other near-field conditions in the literature are made
  • Keywords
    Green´s function methods; acoustic arrays; acoustic signal processing; underwater sound; Fresnel phase approximation; aperture; array; near-field beam pattern; near-field directivity function; time-independent free-space Green´s function; underwater sound; Acoustic beams; Acoustic diffraction; Apertures; Optical arrays; Optical diffraction; Phased arrays;
  • fLanguage
    English
  • Journal_Title
    Oceanic Engineering, IEEE Journal of
  • Publisher
    ieee
  • ISSN
    0364-9059
  • Type

    jour

  • DOI
    10.1109/48.211494
  • Filename
    211494
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=889775