High Sensitivity and High False Alarm Immunity Optical Smoke Detector
AssigneeHoneywell International Inc.
InventorMichael Barson
Life of this patent
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Abstract
A high sensitivity smoke detector includes a housing which defines an internal, closed, scattering region, and an external, open scattering region. A cyclone-type separator draws atmosphere adjacent the external scattering region into the detector and separates the larger, non-smoke related particulate matter which flows into the internal, closed scattering region for sensing and subsequent analysis. An annular inflow pattern can be established with a central exit flow.
Claims20
A low profile smoke detector comprising:
- an internal optical scattering chamber;
- and
- a particle separator, adjacent to the chamber, where the separator removes selected non-fire aerosols to facilitate smoke detection in the chamber in response to remaining particulate matter.
A heat detector which incorporates:
- a housing with an internal thermal sensor,
- a fan, and circuitry coupled to the sensor and the fan,
- where the fan directs ambient air toward the thermal sensor;
- and
- the circuitry responsive thereto makes a heat determination.
A fire sensor for detecting fire in a monitored region, the fire sensor comprising:
- a chamber in fluid communication with the monitored region via at least one inlet;
- an internal detector assembly adapted to detect fire products within the chamber and to output a corresponding internal detection signal;
- an external detector assembly adapted to detect fire products outside the chamber in the monitored region and to output a corresponding external detection signal;
- a cyclone separating device adapted to draw a sample of the atmosphere from the monitored region into the chamber through the at least one inlet;
- and
- a controller adapted to activate the fluid transport device upon receipt of a trigger signal based on the external detection signal to thereby draw a sample of the atmosphere from the monitored region into the chamber for analysis by the internal detector assembly.
Dependencies are inferred from the claim text.