Fire alarm system having prestored fire likelihood ratio functions for respective fire related phenomena
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United States of America Patent
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Nov 30, 1993
Grant Date -
N/A
app pub date -
Aug 30, 1990
filing date -
Jan 25, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A fire alarm system discriminates the presence of a fire using plural likelihood ratio functions respectively associated with plural fire related phenomenon. At least one fire related condition, for example, a temperature level, a smoke density or a gas concentration, of a detected area is detected. Data denoting plural fire related phenomenon are generated based on the at least one fire related condition. The data of each fire related phenomenon is applied to a respective likelihood ratio function defining a relation between the value of the fire related phenomenon and the value of a fire likelihood ratio. The fire likelihood ratio defines a relative probability of a fire attributable to the value of the respective fire related phenomenon. Plural fire likelihood ratio values are obtained according to processing rules, and a centroid value is obtained based on the plural fire likelihood ratio values. A fire is discriminated based on the centroid value.
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