Method and apparatus for determining physical characteristics of objects and object surfaces

  • US 4,493,554 A
  • Filed: 08/24/1981
  • Issued: 01/15/1985
  • Est. Priority Date: 02/27/1979
  • Status: Expired due to Term
First Claim
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1. A method for detecting defects in a bore surface comprising:

  • illuminating a circumference of a bore surface with light, said illumination being effected by directing light onto a curved mirror to concentrate light into an intense ring of light on the circumference of said bore surface;

    imaging the intense ring of light reflected from the circumference of said bore onto a circular photodetector array comprising a plurality of discrete photodetector elements, said elements being capable of generating output signals responsive to the intensity of light incident thereon, said imaging being effected with optical means comprising said curved mirror which collects reflected light from multiple angles;

    scanning said circular array; and

    automatically analyzing the output of said array to detect defects in said bore surface.

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