Automatic vehicle identification and classification (AVIC) system employing a tunnel-arrangement of PLIIM-based subsystems

  • US 20030042304A1
  • Filed: 06/06/2002
  • Published: 03/06/2003
  • Est. Priority Date: 03/24/1998
  • Status: Active Grant
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First Claim
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1. A planar light illumination module (PLIM) of compact construction for producing a planar laser illumination beam (PLIB) which emanates substantially within a single plane along the direction of beam propagation towards an object to be optically illuminated, said PLIM comprising:

  • a module housing having an axial extent, first and second end portions, a central bore formed along its axial extent, and a wedge-like recess integrally formed in said second end portion;

    a visible laser diode (VLD) mounted along said bore at said first end portion of said module housing, for producing a laser beam generally along said axial extent;

    a focusing lens mounted along said bore between said first and second end portions, for focusing said laser beam to a predetermined focal point; and

    a laser beam expansion element mounted within said wedge-like recess at said second end portion of said module housing, and expanding said laser beam along a predetermined direction and producing a substantially planar laser illumination beam from said beam expansion component.

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