06917415 is referenced by 55 patents and cites 10 patents.

A method of and an apparatus for an electro-optical distance measurement in which a laser beam of a laser diode (1) is directed as an intensity modulated train of emitted light pulses onto an object, the reflected measurement pulse train (10) is detected by a light detector (6), 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 (6), 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.

Title
Method of and apparatus for electro-optical distance measurement
Application Number
10/284223
Publication Number
6917415 (B2)
Application Date
October 30, 2002
Publication Date
July 12, 2005
Inventor
Helmut Seifert
Serba
DE
Andreas Winter
Feldkirch
AT
Torsten Gogolla
Schellenberg
LI
Agent
Sidley Austin Brown & Wood
Assignee
Hilti Aktiengesellschaft
LI
IPC
G01C 003/08
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