Fire detection system using spatially cooperative multi-sensor i

Details Fire detection system using spatially cooperative multi-sensor i Fire detection system using spatially cooperative multi-sensor i

1990-09-13

1992-01-07

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250340, 250349, 340577, G08B 17117

Patent

active

050794221

ABSTRACT:
A system for detecting fires uses at least two carbon dioxide sensors positioned at spaced locations in a room. Each sensor produces an electrical output signal representative of the carbon dioxide concentration in its vicinity. A computer calculates the ratio of the concentration sensed by each sensor to the concentration sensed by each of the other sensors, and any imbalance in the distribution of carbon dioxide will be reflected in these ratios. Random variations prevent the ratios from being equal, and the magnitude of the random variations is quantized by calculating the standard deviation of the ratios. The ratios are then normalized and compared to a threshold level that corresponds to a chosen false alarm rate.

REFERENCES:
patent: 4160163 (1979-07-01), Nakauchi
patent: 4390869 (1983-06-01), Christen et al.
patent: 4694172 (1987-09-01), Powel et al.
patent: 4745399 (1988-05-01), Kimura
patent: 5026992 (1991-06-01), Wong

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