06765393 is referenced by 21 patents and cites 3 patents.

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.

Title
Method and an apparatus for determining distance
Application Number
10/158557
Publication Number
6765393 (B2)
Application Date
May 29, 2002
Publication Date
July 20, 2004
Inventor
Sebastian Pastor
Freiburg
US
Hans Werner Pierenkemper
Emmendingen
US
Agent
Townsend and Townsend and Crew
US
Assignee
Sick
US
IPC
G01R 27/04
View Original Source