Segmented optical system for an alarm system

A segmented optical system for use in an alarm system. A plurality of optical elements such as mirrors are arranged so that each of them directs radiation from a predetermined direction towards a common focal point. Each optical element defines a respective discrete field of view to a detector at th...

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Bibliographische Detailangaben
Hauptverfasser:	MUIRHEAD, ALLEN D
Format:	Patent
Sprache:	eng
Schlagworte:	ALARM SYSTEMS COLORIMETRY DETECTING MASSES OR OBJECTS GEOPHYSICS GRAVITATIONAL MEASUREMENTS MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT MEASURING ORDER TELEGRAPHS PHYSICS RADIATION PYROMETRY SIGNALLING SIGNALLING OR CALLING SYSTEMS TESTING
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Beschreibung
Zusammenfassung:	A segmented optical system for use in an alarm system. A plurality of optical elements such as mirrors are arranged so that each of them directs radiation from a predetermined direction towards a common focal point. Each optical element defines a respective discrete field of view to a detector at the focal point, adjacent fields of view overlapping so that an object moving from within one field of view towards an adjacent field of view enters an area which is common to the two adjacent fields of view. There is thus a stepwise change in the intensity of radiation reaching the detector from a single source when that single source crosses the boundary of a field of view and yet there is no space between adjacent fields of view from which no radiation can be received by the detector.