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Optical authentication

  • US 7,812,935 B2
  • Filed: 12/22/2006
  • Issued: 10/12/2010
  • Est. Priority Date: 12/23/2005
  • Status: Active Grant
First Claim
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1. An apparatus for determining a signature from an article in a reading volume of the apparatus, the apparatus comprising:

  • a source operable to generate a coherent beam;

    a beam directing member operable to direct the coherent beam into the reading volume;

    a detector arrangement for collecting signals created by scatter of the coherent beam within the reading volume, wherein different ones of the signals relate to scatter from different parts of the reading volume, the detector arrangement having a numerical aperture greater than approximately 0.1 to cause a speckle component of the collected signals to be at least partially averaged out over the cone angle of collection; and

    a processor operable to determine a signature for an intrinsic structure of an article in the reading volume from the collected signals.

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