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. 18, 2012
Filed:
Nov. 13, 2009
Reinhard Heizmann, Glottertal, DE;
Gottfried Hug, Waldkirch, DE;
Martin Marra, Freiburg, DE;
Bahram Torabi, Freiburg, DE;
Reinhard Heizmann, Glottertal, DE;
Gottfried Hug, Waldkirch, DE;
Martin Marra, Freiburg, DE;
Bahram Torabi, Freiburg, DE;
Sick AG, Waldkirch, DE;
Abstract
An optoelectronic sensor () for the measurement of distances or distance changes in accordance with the light transit time principle is provided having a light transmitter () for the transmission of a light signal and having a light receiver () for the reception of the remitted or reflected light signal, wherein an evaluation unit () is provided which is made to fix the transmission time for the light signal relative to a reference time and to digitize the received light signal on a sampling pattern () having a sampling period to determine the reception time of the light signal, and wherein a time base unit () is provided by means of which the transmission time can be shifted relative to the sampling pattern () with a time precision below the sampling period. In this respect, the time base unit () is made to derive the time shift from a first time signal having a first frequency (f) and a second time signal having a second frequency (f) different from the first frequency (f) and to provide any desired time shifts with a time resolution given by the difference period belonging to the first and second frequencies (f, f).