SEGMENTED OPTICAL SYSTEM FOR AN ALARM SYSTEM

SEGMENTED OPTICAL SYSTEM FOR AN ALARM SYSTEM

A plurality of optical elements such as mirrors (1 to 5) are arranged so that each of them directs radiation from a predetermined direction towards a common focal point (7). Each optical element defines a respective discrete field of view (8, 9) to a detector at the focal point, adjacent fields of v...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: MUIRHEAD, ALLEN DAVID
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 plurality of optical elements such as mirrors (1 to 5) are arranged so that each of them directs radiation from a predetermined direction towards a common focal point (7). Each optical element defines a respective discrete field of view (8, 9) to a detector at the focal point, adjacent fields of view overlapping (10) so that an object moving from within one field of view (8) towards and adjacent field of view (9) enters an area (10) 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.