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Method of broad band electromagnetic holographic imaging

  • US 6,253,100 B1
  • Filed: 12/23/1998
  • Issued: 06/26/2001
  • Est. Priority Date: 06/26/1996
  • Status: Expired due to Term
First Claim
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1. A method for imaging an anomalous target located in a nontransparent examined medium, said method comprising the steps of:

  • a. placing an electromagnetic transmitter source in transmission contact with said examined medium;

    b. placing electromagnetic receivers at various receiving positions with respect to said examined medium, spaced from said transmitter source;

    c. operating said transmitter source to generate a broad band electromagnetic field comprising an harmonic (frequency domain) and/or pulse (time domain) electromagnetic field, whereby said generated electromagnetic field propagates through said examined medium to interact with said target, resulting in a scattered electromagnetic field;

    d. measuring said scattered electromagnetic field with said receivers;

    e. obtaining a background field {Eb,Hb} representative of a background medium consisting of said examined medium without the presence of said anomalous target;

    f. obtaining a backscattering anomalous field {Eas,Has} equivalent to that obtainable by illuminating said background medium with said scattered electromagnetic field transmitted from the positions of said receivers; and

    g. producing a broad band holographic image of said anomalous target by calculating cross power spectra of said background and said backscattering fields or cross correlation functions between said background and said backscattering fields.

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