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Imaging process and system for transillumination with photon frequency marking

  • US 5,174,298 A
  • Filed: 02/27/1990
  • Issued: 12/29/1992
  • Est. Priority Date: 07/03/1987
  • Status: Expired due to Term
First Claim
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1. A transillumination imaging method comprising:

  • transmitting a first light beam (F1) into at least one scattering zone within a medium (H) to be imaged;

    transmitting into said scattering zone within said medium at least first and second acoustic waves having a first frequency (f1) and a second frequency (f2), respectively, wherein the first frequency (f1) and the second frequency (f2) are different and the at least first and second acoustic waves interfere with the first light beam (F1), with the second acoustic wave interfering with the first light beam after the first acoustic wave interferes with the first light beam, thereby producing a second light beam (F2) produced by interference of said first and second acoustic waves with said first light beam;

    producing a reference beam to interfere with the second light beam; and

    applying said second light beam and said reference to a detector and measuring a quantity of light scattered by said scattering zone by detecting a light which has been subjected to a translation of the first frequency (f1) and the second frequency (f2).

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