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:
Jan. 27, 1987
Filed:
Feb. 26, 1985
Applicant:
Inventor:
Bernard Lerat, Igny, FR;
Assignee:
Commissariat a l'Energie Atomique, Paris, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01B / ;
U.S. Cl.
CPC ...
356376 ; 356-4 ; 356375 ;
Abstract
The invention relates to an optical device for measuring the surface proximity and to its application in the plotting of a profile. The device comprises a radiation emitter forming a light spot on the surface and two detectors, which are sensitive to the light flux reflected by the surface. A pair of focusing elements having different focal lengths are associated with the detectors. The ratio between the signals supplied by the detectors is determined by a processing circuit. This ratio is used to calculate the distance independently of the angle of incidence of the incident beam and the reflection coefficient of the surface.