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Panel surface flaw inspection

  • US 4,920,385 A
  • Filed: 04/06/1989
  • Issued: 04/24/1990
  • Est. Priority Date: 02/14/1984
  • Status: Expired due to Term
First Claim
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1. Method for inspecting surfaces for defects comprising the steps of;

  • illuminating said surface with a beam of light which is projected along a beam axis to said surface and reflected therefrom,positioning a retro reflective material comprising a plurality of minute elements such that a zone of light is produced on said retro reflective material by the reflected beam of light and such that the light forming the zone is retro reflected from said retro reflective material and is re-reflected from said surface as a cone of light centered about said beam axis,detecting a portion of said re-reflected cone of light and forming an image of the zone on a light sensing detector having a viewing axis at an angle to said beam axis so as to be substantially unresponsive to light re-reflected along the beam axis, anddetermining from said detected image of said re-reflected light any defects in said surface.

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