The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 27, 1988
Filed:
May. 08, 1987
Applicant:
Inventors:
George S Quackenbos, Newburyport, MA (US);
Jay L Ormsby, Salem, NH (US);
Eric T Chase, Andover, MA (US);
Sergey V Broude, Acton, MA (US);
Koichi Nishine, Westford, MA (US);
Assignee:
QC Optics, Inc., Burlington, MA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G18 / ;
U.S. Cl.
CPC ...
250572 ; 356430 ; 356237 ;
Abstract
An apparatus and method for uniquely detecting pits on a smooth surface by irradiating an area of the surface; separately sensing radiation scattered from the surface in the near-specular region indicative of a pit and in the far-specular region indicative of a flaw and producing signals representative thereof; normalizing the near-specular signal with respect to the far-specular signal to indicate a pit; and discriminating the near-specular components of the normalized signal representative of surface pits.