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Event scanning

  • US 4,623,797 A
  • Filed: 06/27/1983
  • Issued: 11/18/1986
  • Est. Priority Date: 06/27/1983
  • Status: Expired due to Fees
First Claim
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1. The method of scanning surface characteristics of an object to selectively obtain data representing only portions of the surface having selected characteristics comprisingmoving a scanning energy beam in a scan pattern across the object so that beam energy reflected from discrete positions on the object is detectable,relatively moving the object and scan pattern to cause the beam to illuminate areas on the surface of the object in scan paths that repetitively cross the object,generating position signals representing the position of the beam in said scan paths, in reference to discrete positions on the object,detecting energy of said beam reflected from said object at such discrete positions,employing the magnitude of detected energy to select certain of the position signals, each corresponding to a selected discrete position, based upon the occurrence of a detected energy magnitude at one of a plurality of different magnitudes of detected energy, andemploying the selected position signals and the magnitude associated with each such selected position signal to define details of the surface characteristics of only those portions of the object having the selected characteristics of the object.

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