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US 7,233,253 B2Granted
Multiwavelength smoke detector using white light LED
AssigneeSimplexGrinnell LP
InventorJames R. Qualey, III
Life of this patent
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Abstract
A smoke detector includes a smoke detection chamber containing a white light LED and a light detector. The light detector detects light within at least two distinct optical wavelength bands, and generates respective signals indicative of the intensities of the detected light. An analyzer determines, based on the measured light intensities of the different wavelength bands, whether a dangerous smoke/fire condition is present.
Claims22
A fire alarm control panel, comprising:
- communication means for receiving, from at least one smoke detector, information about measured light intensities of different wavelength bands;
- and
- an analyzer which determines, based on the measured light intensities of the different wavelength bands, whether a dangerous smoke/fire condition is present;
- wherein the at least one smoke detector comprises
- a smoke detection chamber,
- a light source having a broad optical spectrum,
- a light detector which detects light within at least two distinct optical wavelength bands within said spectrum, the detector generating signals having amplitudes which are responsive to intensities of the detected light, both the light source and light detector being within the detection chamber, and
- transmission means for transmitting the measured light intensity information to the fire alarm control panel.
5 more elements
Dependencies are inferred from the claim text.