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.
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Citations
89 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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27-80. -80. (canceled)
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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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89-101. -101. (canceled)
Specification