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Portal

  • US 8,339,606 B2
  • Filed: 11/12/2007
  • Issued: 12/25/2012
  • Est. Priority Date: 11/29/2006
  • Status: Active Grant
First Claim
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1. A portal or gateway configured to allow people or items to pass through, wherein the portal or gateway comprises:

  • a vertical support;

    a chirped laser;

    an open optical sample cell; and

    a detector for detecting light from the chirped laser that has passed through the open optical sample cell, wherein the open optical sample cell is defined by a mirror at each end, the mirrors being included in the vertical support, so that the open optical sample cell extends along the vertical support.

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