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. 06, 2012
Filed:
Feb. 10, 2009
Thomas Luethi, Winterthur, CH;
Dietrich Meier, Niedererlinsbach, CH;
Thomas Luethi, Winterthur, CH;
Dietrich Meier, Niedererlinsbach, CH;
Leica Geosystems AG, Unterentfelden, CH;
Abstract
An electro-optical distance-measuring unit () includes a light source (), the emitted light of which in the distance-measuring unit () is guided onto a measurement path () at least by one polarizing beam splitter (), an electro-optical modulator () and a retarder (). Light that is returned along the measurement path () is guided at least by the retarder (), the electro-optical modulator () and the polarizing beam splitter () onto a detector (). The distance-measuring unit () furthermore includes a control and evaluation unit () for determining a length of the measurement path () in accordance with a modulation frequency of the electro-optical modulator () and a signal of the detector (). The light source () has a broad spectrum of the emitted light and is preferably a super-luminescent diode.