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:
Nov. 22, 1994
Filed:
Jun. 01, 1993
Kevin G Harding, Ann Arbor, MI (US);
Albert J Boehnlein, Ypsilanti, MI (US);
Industrial Technology Institute, Ann Arbor, MI (US);
Abstract
A method of evaluating defects in a surface as compared with a reference surface by providing a surface for defect evaluation, illuminating and projecting a pattern of lines on the surface having a periodic configuration with features having a separation period, providing a camera for recording a reflected image of the pattern of lines projected and reflected from the surface, and evaluating and quantifying the image by calculating a slope of a defect observed by the camera using a specified relationship. The distance between the illuminated pattern and the surface are used to calculate the defect slope and a defect depth value is generated using a specified relationship dependent on length of a defect area visually recognizable from the reflected image and the calculated defect slope.