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:
Jun. 19, 2012
Filed:
May. 10, 2010
Josef Siraky, Donaueschingen, DE;
Josef Siraky, Donaueschingen, DE;
Sick Stegmann GmbH, Donaueschingen, DE;
Abstract
The invention relates to a sensor for the determination of the rotational speed of a shaft. To provide a sensor improved with respect to known tachometers, it is proposed that the sensor has a stationary part () and a part () co-rotating with the shaft (), wherein the stationary part () has a laser light source (), a first optical coupler (), an optical detector () and an evaluation unit () which determines the rotational speed from the detector signals and the rotating part () has a light guide coil () which is rotationally fixedly connected to the shaft () and is wound concentrically to the shaft () and the ends (and) of the light guide coil () are guided to an end face so that, on the one hand, the light () of the light source () can be coupled into both ends (and) and two light components run around in opposite directions in the light guide coil () and, on the other hand, the light components can be decoupled from the two ends (and) for the superimposition of the light components on the detector () so that, on a rotation of the shaft (), the detector signals can be detected while exploiting the Sagnac effect from the phase shift, dependent on the rotational speed, of the two light components running around in opposite directions.