Multi-sensor detectors
First Claim
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1. An ambient condition detector comprising:
- a housing;
a first acoustic resonator carried by the housing and responsive to a developing fire condition;
a second acoustic resonator with a filter carried by the housing and responsive to a developing fire condition;
at least one ambient condition sensor carried by the housing and responsive to a developing fire condition; and
control circuits, carried by the housing, coupled to the first and second acoustic resonators and to the at least one ambient condition sensor,where the control circuits respond to signals from the first acoustic resonator and the second acoustic resonator with the filter to determine an affect of airborne smoke related particulate matter on resonator frequency, andwhere the circuits respond to signals from each of the first and second acoustic resonators and from the at least one ambient condition sensor to determine the existence of a fire condition.
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Abstract
A multi-sensor fire detector incorporates at least one acoustic resonator and other type or types of fire sensor. Other types include smoke sensors, gas sensors or optically based fire sensors. Outputs from the acoustic resonator can be processed with or without outputs from the other type or types of fire sensors to establish the presence of an alarm condition. Multiple acoustic resonators can be incorporated into the same detector.
18 Citations
17 Claims
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1. An ambient condition detector comprising:
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a housing; a first acoustic resonator carried by the housing and responsive to a developing fire condition; a second acoustic resonator with a filter carried by the housing and responsive to a developing fire condition; at least one ambient condition sensor carried by the housing and responsive to a developing fire condition; and control circuits, carried by the housing, coupled to the first and second acoustic resonators and to the at least one ambient condition sensor, where the control circuits respond to signals from the first acoustic resonator and the second acoustic resonator with the filter to determine an affect of airborne smoke related particulate matter on resonator frequency, and where the circuits respond to signals from each of the first and second acoustic resonators and from the at least one ambient condition sensor to determine the existence of a fire condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An ambient condition detector comprising:
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a housing; at least two different vibratory atmospheric sensors, carried by the housing, at least one of the sensors is responsive to a developing fire condition; at least one ambient condition sensor; and control circuits, carried by the housing, coupled to the at least two different vibratory sensors and to the at least one ambient condition sensor, the control circuits respond to signals from each of the at least two different vibratory sensors to determine an effect of airborne smoke related particulate matter on resonant frequency and to signals from the at least one ambient condition sensor to determine the existence of a fire condition, where a first of the vibratory atmospheric sensors is sealed, a second of the vibratory atmospheric sensors is open to ambient atmosphere, and the control circuits evaluate signals from the first and second vibratory atmospheric sensors to establish an indication of temperature in the ambient atmosphere and an effect of the temperature on operation of the detector. - View Dependent Claims (10, 11, 12, 13)
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14. A fire detector comprising:
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a first oscillatory sensing element completely exposed to an ambient atmosphere; a second oscillatory sensing element including a filter and exposed to the ambient atmosphere from which particulate matter has been filtered; a third oscillatory sensing element sealed at atmospheric pressure; at least one ambient condition sensor; and control circuits coupled to the first, second, and third oscillatory sensing elements and to the at least one ambient condition sensor, wherein, responsive to signals from the first, second, and third oscillatory sensing elements and from the at least one ambient condition sensor, the control circuits determine an effect of airborne smoke related particulate matter on resonator frequency and the existence of a fire condition from the effect on resonator frequency and generate fire related indicia, and wherein the control circuits analyze output signals from the first, second, and third oscillatory elements to evaluate the particulate matter in the ambient atmosphere, temperature of the ambient atmosphere, and chemical composition changes in the ambient atmosphere. - View Dependent Claims (15, 16, 17)
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Specification