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. 17, 1985
Filed:
Jul. 27, 1983
Reinhard Ulrich, Buchholz, DE;
Klaus Jansen, Hamburg, DE;
H. Maihak AG, , DE;
Abstract
For interferometric measurement of the length of the linear component of movement of a moving point relative to a fixed point and simultaneous recognition of the direction of that movement, two merged or overlapping Fabry-Perot part interferometers are used to form an asymmetric pattern of the reflection or transmission intensity which is periodically dependent on the linear component of the path, the pattern having main and secondary maxima of different heights and main and secondary minima of different depths. The intensity variation is converted by a detector into electrical intensity signals which cross threshold values of trigger circuits to produce output pulses. The pulses are combined and counted to produce displays of the direction and to provide a reading of the instantaneous position of the movable point.