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| A presence detection system for identifying a person within a predefined zone. The system uses a light source and at least one detector to receive reflected radiation. A filter which allows only selected wavelengths of light to pass is used to avoid overloading of a detector with background light. By monitoring the change in the light that bounces off of the person and back by the detector, movement within the predefined zone can be determined.Detection accomplished detecting reflected light radiation space watched presence identified detected differs esablished background either increase decrease amount exceeding predetermined threshold Blending entity avoided viewing least two angles backgrounds implementation spaced detectors Variations automatically compensated indication persists period time last motion received updated current level occurs sources structured irradiate entire Saturation ambient bandpass filter passes narrow overlap wavelength |
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