Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Patent
1998-01-20
2000-08-08
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
356 501, G01C 308
Patent
active
061005398
ABSTRACT:
The invention relates to a light sensor comprising a light transmitter for transmitting a light signal (T.sub.x, T.sub.xd) into a region to be monitored, a light receiver for receiving a reflected light signal (R.sub.x) from an object present in the monitored region, at least one signal generator for producing a first signal (T.sub.x) to energize the light transmitter and also for producing a second signal (L.sub.0) standing in a defined phase relationship to the first signal (T.sub.x), but with a different signal shape in comparison to the first signal (T.sub.x), and also a correlation stage for producing the correlation function (KKF) between the received light signal (R.sub.x) and the second signal (L.sub.0, L.sub.0d) as well as an evaluation stage following the correlation stage for determining information related to the distance between the light sensor and the object.
REFERENCES:
patent: 5805468 (1998-09-01), Blohbaum
Lewers, Karl: Mit mobilen Datenterminals Kundenprobleme angehen. In: Online Sep. 1981, pp. 566 and 567.
Tamiya N, et al.: "Optical spread spectrum radar for lateral detection in vehicles", 1996 IEEE 4.sup.th International Symposium on Sprectrum Techniques and Applications Proceedings. Techniques and Applications Proceedings. Technical Program. (CAT NO. 96.sup.th 8210) Proceedings of isssta '95 International Syposium on Spread Spectrum Techniques and Applications, Mainz, Germany, pp. 195-198 vol. 1, XP002107877 ISBN 0-7803-3567-8, 1996, New York, NY, USA, IEEE, USA.
Blumcke Thomas
Breisacher Hans-Joachim
Le Que T.
Pyo Kevin
Sick AG
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