Optically Redundant Fire Detector for False Alarm Rejection
First Claim
1. A system for discriminating between a fire event and a false fire event comprising,a first radiation detecting structure configured for transmitting a first signal,a second radiation detecting structure being operationally redundant to the first radiation detecting structure and configured for transmitting a second signal,an electronic assembly configured for (i) receiving the first signal and at least one other signal and calculating a first output based thereon, (ii) determining whether the first output satisfies a first predetermined flame-presence criteria for indicating a fire event, (iii) receiving the second signal and calculating a second output based on the second signal and the at least one other signal, (iv) determining whether the second output satisfies a second predetermined flame-presence criteria for indicating a fire event, and (v) transmitting a fire alarm command signal to a fire extinguishing system when both the first output satisfies the first predetermined flame-presence criteria and the second output satisfies the second predetermined flame-presence criteria.
3 Assignments
0 Petitions
Accused Products
Abstract
A system for confirming the detection of a fire using a plurality of radiation or flame sensors each equipped with a radiation detector and an optical filter having a spectral transmission characteristic in which at least one optical filter is redundant to at least one other optical filter. The result is a system having operationally redundant sensors. In use, if a fire is detected by one of the redundant sensors without including the other redundant radiation sensor in the fire detection calculation, then a fire detection algorithm can switch to the other operationally redundant sensor to check for confirmation of a fire. Due to the spatial separation and if the object is small and close, a different result will be obtained with the redundant detector being used in the calculation compared to the primary detector that is associated with the redundant detector.
-
Citations
23 Claims
-
1. A system for discriminating between a fire event and a false fire event comprising,
a first radiation detecting structure configured for transmitting a first signal, a second radiation detecting structure being operationally redundant to the first radiation detecting structure and configured for transmitting a second signal, an electronic assembly configured for (i) receiving the first signal and at least one other signal and calculating a first output based thereon, (ii) determining whether the first output satisfies a first predetermined flame-presence criteria for indicating a fire event, (iii) receiving the second signal and calculating a second output based on the second signal and the at least one other signal, (iv) determining whether the second output satisfies a second predetermined flame-presence criteria for indicating a fire event, and (v) transmitting a fire alarm command signal to a fire extinguishing system when both the first output satisfies the first predetermined flame-presence criteria and the second output satisfies the second predetermined flame-presence criteria.
-
10. A method for discriminating between a fire event and a false fire event in a monitored region comprising,
positioning a plurality of flame sensors within the monitored region, wherein the plurality of flame sensors includes at least a first flame sensor and a second flame sensor that is operationally redundant to the first flame sensor, transmitting signals from the plurality of flame sensors to an electronic assembly upon detection by the plurality of flame sensors of a potential fire event, calculating a first output and a second output based upon the signals, wherein the first output is calculated using a first signal transmitted by the first flame sensor absent a second signal transmitted by the second flame sensor, and the second output is calculated using the second signal absent the first signal.
-
20. A method of making a system for discriminating between a fire event and a false fire event comprising,
operatively coupling a plurality of flame sensors to an electronic assembly, configuring a first sensor of the plurality of flame sensors to be operationally redundant to a second sensor of the plurality of flame sensors, and configuring the electronic assembly for (i) receiving and analyzing signals generated by the plurality of flame sensors upon detection thereby of a potential fire event, (ii) calculating a first output using a first signal transmitted by the first sensor absent a second signal transmitted by the second sensor, (iii) calculating a second output using the second signal absent the first signal, and (iii) transmitting a fire alarm command signal to a fire extinguishing system when the first output and the second output indicate a fire event.
Specification