Self-calibrating smoke detector and method

Details Self-calibrating smoke detector and method Self-calibrating smoke detector and method

1981-03-24

1983-12-13

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

250574, 340501, 340629, G08B 1710

Patent

active

044207468

ABSTRACT:
A self-calibrating obscuration smoke detector is provided along with a method for the operation thereof. A light source and a photodetector are mounted in spaced relation to one another with the output of the photodetector being a function of the amount of light sensed by the detector from the light source. The photodetector analog output is converted into digital signals by an A/D converter and digital signals are then delivered to a digital processor adapted to periodically calibrate the detector and to perform sampling operations between calibrations. Other sensing devices may be connected to the system with automatic self-calibrating capabilities with respect thereto including a temperature responsive element the output of which may be used to compensate for changes in ambient temperature. By using a pair of photodetecting cells directly visible to separate light sources or indirectly visible to a single source, a thermally stable system is provided where one cell provides a reference output for the other cell.

REFERENCES:
patent: 4021792 (1977-05-01), Ludt et al.
patent: 4237453 (1980-12-01), Malinowski
patent: 4249169 (1981-02-01), Malinowski
patent: 4254414 (1981-03-01), Street et al.
patent: 4266218 (1981-05-01), Kardash
patent: 4266220 (1981-05-01), Malinowski

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