Patent ID: 6507023
Filing Date: 2003-01-14
Classification: G08B

Abstract:
A method of determining whether an unknown phenomenon constitutes a unwanted fire situation, comprising the steps of:(a) generating, during the unknown phenomenon, a first spectrum of frequency components from temporal energy sensed in a first optical frequency range and a second spectrum of frequency components from temporal energy sensed in a second optical frequency range different from the first optical frequency range; (b) generating a compensated spectrum of frequency components by comparing the second spectrum of frequency components with the first spectrum of frequency components; (c) obtaining a subject amplitude-centroid coordinate from the compensated spectrum of frequency components; (d) obtaining a plurality of reference amplitude-centroid coordinates by repeating steps (a) through (c) for each of a variety of environments respectively comprising known fires and known false alarms, (e) constructing a plot comprising the subject amplitude-centroid coordinate and the plurality of reference amplitude-centroid coordinates; (f) defining a fire detection boundary on the plot based on a location of plurality of reference amplitude-centroid coordinates; and (g) determining whether the unknown phenomenon represents a possible fire based on a location of the subject amplitude-centroid coordinate with respect to the fire detection boundary.