Method for detecting objects in a monitored area

Details Method for detecting objects in a monitored area Method for detecting objects in a monitored area

1995-02-17

1996-07-23

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340555, G01V 904

Patent

active

055391990

ABSTRACT:
A method is provided for detecting objects located in or entering into an area to be monitored with a device including a transmitter, a receiver and an evaluation unit. A transmitted beam emitted by the transmitter transversely to the radiation direction of the transmitted beam is guided inside the area. For different orientations of the transmitted beam, the distances of the objects from the device are detected and these measured position values are stored in the evaluation unit. For detecting objects of a particular shape the measured position values for the respective object are compared with set values, which are calculated in the evaluation unit from the shape of the object when in a predetermined position in the area to be monitored. An object having a defined shape is considered to have been recognized when a minimum number N of the measured position values falls around the set values within at least one tolerance band T. The minimum number N of the position values and the width of the tolerance band T are selected in the evaluation unit as a function of the dispersion of the measured position values.

REFERENCES:
patent: 5247296 (1993-09-01), Spies
patent: 5313060 (1994-05-01), Gast et al.
Fujii et al., `Sub-step Infrared Range Estimation for a Mobile Robot`, Proceedings of the 1992 IEEE/RSJ International Conference on Intelligent Robots and Systems, vol. 3, 7-10, Jul. 1992, IEEE New York, NJ, pp. 2041-2046.

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