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. 20, 2004
Filed:
May. 29, 2002
Hans-Werner Pierenkemper, Emmendingen, DE;
Sebastian Pastor, Freiburg, DE;
Sick, AG, , DE;
Abstract
Techniques for determining the distance between a measuring apparatus and an object are provided. The measuring apparatus includes a transmitter, a receiver and a filter module having a defined phase frequency characteristic, in which a modulated signal, in particular a light signal, is transmitted in the direction of the object by the transmitter, the signal reflected by the object is received by the receiver and the output signal of the receiver is delivered to the transmitter at least via the filter module, wherein at least the transmitter, the receiver and the filter module form a resonant circuit, the frequency of resonance of the resonant circuit is measured and the distance is determined from the frequency of resonance. The respective frequency of resonance of the resonant circuit is determined for at least two different phase frequency characteristics.