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:
Jul. 12, 2005
Filed:
Oct. 30, 2002
Torsten Gogolla, Schellenberg, LI;
Andreas Winter, Feldkirch, AT;
Helmut Seifert, Serba, DE;
Hilti Aktiengesellschaft, Schaan, LI;
Abstract
A method of and an apparatus for an electro-optical distance measurement in which a laser beam of a laser diode () is directed as an intensity modulated train of emitted light pulses onto an object, the reflected measurement pulse train () is detected by a light detector (), which generates, in response to the detection of a measurement pulse train, a first photo-current component, a smaller portion of the intensity modulated pulse train is branched out as a reference pulse train and, after passing a known reference path, is also detected by the light detector (), which generates in response to this detection a second photo current component, and the light detector converts the measurement pulses, together with a mixer pulse train generated by a local oscillator, into a comparatively low-frequency IF-region that determines, after a corresponding conversion, the measured distance.