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Portable structured light measurement module/apparatus with pattern shifting device incorporating a fixed-pattern optic for illuminating a subject-under-test

  • US 9,444,981 B2
  • Filed: 07/26/2012
  • Issued: 09/13/2016
  • Est. Priority Date: 07/26/2011
  • Status: Active Grant
First Claim
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1. A surface measurement module for 3-D image acquisition of a subject-under-inspection, the module comprising:

  • (a) a casing to house a pattern shifting device from which an output comprising a multi-frequency pattern comprising a plurality of pixels representing at least a first and second superimposed sinusoid of light from a light source, is directed at a polarizing beam splitter,(b) each said pixel of said plurality of pixels comprised of said first sinusoid having a first frequency distinct from a second frequency of said second sinusoid;

    (c) the polarized output of said splitter directed through a lens assembly comprising at least one lens element;

    (d) a reflector to direct said polarized output exiting said lens assembly, to illuminate a surface of the subject-under-inspection;

    (e) a scattered light illumination off said surface is directed back to said reflector and then through said lens assembly for capture by an image sensor; and

    (f) said casing also housing said polarizing beam splitter, said lens assembly, and said image sensor.

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