Multiwavelength smoke detector using white light LED
First Claim
Patent Images
1. A smoke detector, comprising:
- a smoke detection chamber;
a light source having a broad optical spectrum; and
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.
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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.
46 Citations
101 Claims
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1. A smoke detector, comprising:
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a smoke detection chamber;
a light source having a broad optical spectrum; and
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. An alarm system, comprising:
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a system controller; and
at least one smoke detector, comprising 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 communication means for forwarding information about the measured light intensities of the different wavelength bands to the system controller, the system controller comprising an analyzer which determines, based on the measured light intensities of the different wavelength bands, whether a dangerous smoke/fire condition is present. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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47. A fire alarm control panel, comprising:
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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. - View Dependent Claims (48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63)
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64. A method for detecting smoke, comprising:
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in a smoke detection chamber, shining a light source having a broad optical spectrum, and detecting light within at least two distinct optical wavelength bands within said spectrum;
generating signals having amplitudes which are responsive to intensities of the detected light; and
determining, based on the measured light intensities of the different wavelength bands, whether a dangerous smoke/fire condition is present. - View Dependent Claims (65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80)
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81. A smoke detector, comprising:
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in a smoke detection chamber, light source means for providing light having a broad optical spectrum, and light detection means for detecting light within at least two distinct optical wavelength bands within said spectrum;
means for generating signals having amplitudes which are responsive to intensities of the detected light; and
means for determining, based on the measured light intensities of the different wavelength bands, whether a dangerous smoke/fire condition is present. - View Dependent Claims (82, 83, 84, 85, 86, 87, 88)
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89. An aerosol detection system, comprising:
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a detection chamber;
means for allowing an aerosol to pass from an outside environment into the detection chamber while blocking most ambient light;
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 which are responsive to intensities of the detected light, both the light source and light detector being within the detection chamber; and
an analyzer which detects, based on the measured light intensities of the different wavelength bands, whether a particular type of aerosol is present in the detection chamber. - View Dependent Claims (90, 91, 92, 93, 94)
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95. An aerosol identification system, comprising:
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a detection chamber;
means for allowing an aerosol to pass from an outside environment into the detection chamber while blocking most ambient light;
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 which are responsive to intensities of the detected light, both the light source and light detector being within the detection chamber; and
an analyzer which identifies, based on the measured light intensities of the different wavelength bands, at least one type of aerosol that is present in the detection chamber. - View Dependent Claims (96, 97, 98, 99, 100, 101)
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Specification