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. 01, 1988
Filed:
Sep. 11, 1986
Klaus U Baron, Heidelberg, DE;
Eberhard Kiesel, Edingen, DE;
Teldix GmbH, Heidelberg, DE;
Abstract
A rpm-measuring device including a closed light path comprising a coil formed of a plurality of winding layers of an optical fiber having first and second ends; a beam splitter connected to the first and second ends; an arrangement for passing two light beams in opposite directions through the coil by applying the two light beams to the first and second ends, respectively, and an arrangement for superposing the two light beams subsequent to their passage through the coil and for evaluating a phase-shift based on the Sagnac-effect. The distance of the light path between the first end and any selected first location of the optical fiber is identical to the distance of the light path between the second end and a second location of the optical fiber. The selected first location and the second location are situated in immediately adjoining two windings belonging to two separate, immediately adjoining winding layers, whereby the two light beams propagate at all times in immediately adjoining two windings belonging to two separate, immediately adjoining winding layers.