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. 21, 1982
Filed:
Nov. 17, 1980
Chester S Gardner, Champaign, IL (US);
William E Streight, East Peoria, IL (US);
Caterpillar Tractor Co., Peoria, IL (US);
Abstract
A compact gauge (10) for effectively measuring the surface roughness of an article (14) in any direction of lay includes: first means (30) for directing a light beam (32) upon a surface (12) of the article (14), second means (34) for providing a first signal proportional to the specular light reflected from the surface (12), the first and second means (30,34) defining a common plane (40), third means (58) for providing a second signal proportional to the diffused light reflected from the surface (12) in the common plane (40), and fourth means (61) for providing a third signal proportional to the diffused light reflected from the surface (12) to the side of the common plane (40). The subject gauge (10) includes a sensor head (28) that can be miniaturized and electrical circuit means (66,104) that can process the signals and provide a direct reading in micrometers independent of the reflectivity level of the surface.