Multi-sensor device and methods for fire detection
First Claim
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1. A detector for sensing an environmental condition comprising:
- a light sensor which generates a first signal indicative of incident ambient light intensity;
at least a second sensor which generates a second signal indicative of a different environmental condition;
where the second sensor is selected from a class which includes a smoke sensor, a gas sensor, a thermal sensor, a humidity sensor, and a motion sensor;
a processor that receives the first and the second signals, the processor using the first signal to alter a delay time associated with the second sensor, the processor using the first signal to alter a sensitivity parameter associated with the second sensor, and the processor providing an indication of the presence of the environmental condition.
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Abstract
Multiple parameter fire detection uses outputs from one or more radiant energy sensors in combination with outputs from smoke or thermal sensors to shorten response times to alarm while minimizing nuisance alarms. The radiant energy related outputs can be used to alter parameters of the smoke or thermal sensors. The various sensors can be displaced from one another in an alarm system.
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Citations
11 Claims
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1. A detector for sensing an environmental condition comprising:
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a light sensor which generates a first signal indicative of incident ambient light intensity; at least a second sensor which generates a second signal indicative of a different environmental condition; where the second sensor is selected from a class which includes a smoke sensor, a gas sensor, a thermal sensor, a humidity sensor, and a motion sensor; a processor that receives the first and the second signals, the processor using the first signal to alter a delay time associated with the second sensor, the processor using the first signal to alter a sensitivity parameter associated with the second sensor, and the processor providing an indication of the presence of the environmental condition. - View Dependent Claims (2, 3, 4)
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5. A detector for sensing an environmental condition comprising:
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a light sensor which generates a first signal indicative of incident ambient light intensity; at least a second sensor which generates a second signal indicative of a different environmental condition; where the second sensor is selected from a class which includes a smoke sensor, a gas sensor, a thermal sensor, a humidity sensor, and a motion sensor; a processor that receives the first and second signals, the processor using the first signal to alter a delay time associated with the second sensor, the processor using the first signal to alter a sensitivity parameter associated with the second sensor, and the processor providing an indication of the presence of the environmental condition; and where the processor alters the delay time in response to the first signal indicating the presence of a predetermined ambient light intensity.
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6. A detector for sensing an environmental condition comprising:
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a light sensor which generates a first signal indicative of incident ambient light intensity; at least a second sensor which generates a second signal indicative of a different environmental condition; where the second sensor is selected from a class which includes a smoke sensor, a gas sensor, a thermal sensor, a humidity sensor, and a motion sensor; a processor that receives the first and second signals, the processor using the first signal to alter a delay time associated with the second sensor, the processor using the first signal to alter a sensitivity parameter associated with the second sensor, and the processor providing an indication of the presence of the environmental condition; and where the first signal is indicative of a pattern of varying incident light.
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7. A detector for sensing an environmental condition comprising:
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a light sensor which generates a first signal indicative of incident ambient light intensity; at least a second sensor which generates a second signal indicative of a different environmental condition; where the second sensor is selected from a class which includes a smoke sensor, a gas sensor, a thermal sensor, a humidity sensor, and a motion sensor; a processor that receives the first and second signals, the processor using the first signal to alter a delay time associated with the second sensor, the processor using the first signal to alter a sensitivity parameter associated with the second sensor, and the processor providing an indication of the presence of the environmental condition; and where the delay time is present only in response to a predetermined level of the second signal.
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8. A detector for sensing an environmental condition comprising:
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a light sensor which generates a first signal indicative of incident ambient light intensity; at least a second sensor which generates a second signal indicative of a different environmental condition; where the second sensor is selected from a class which includes a smoke sensor, a gas sensor, a thermal sensor, a humidity sensor, and a motion sensor; and a processor that receives the first and second signals, the processor using the first signal to alter a sensitivity parameter associated with the second sensor, and the processor providing an indication of the presence of the environmental condition. - View Dependent Claims (9, 10)
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11. A detector for sensing an environmental condition comprising:
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a light sensor which generates a first signal indicative of incident ambient light intensity; at least a second sensor which generates a second signal indicative of a different environmental condition; where the second sensor is selected from a class which includes a smoke sensor, a gas sensor, a thermal sensor, a humidity sensor, and a motion sensor; a processor that receives the first and second signals, the processor using the first signal to alter a delay time associated with the second sensor, the processor using the first signal to alter a sensitivity parameter associated with the second sensor, and the processor providing an indication of the presence of the environmental condition; and where the first signal is indicative of a pattern of varying incident light.
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Specification