Smoke detectors

Details Smoke detectors Smoke detectors

2007-10-24

2011-12-27

Wu, Daniel (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S630000, C340S619000, C250S341800, C250S574000, C356S438000, C356S437000

Reexamination Certificate

active

08085157

ABSTRACT:
A multi-frequency photoelectric smoke detector includes a multi-frequency, source and an multi-frequency sensing array. The array can be part of a solid state camera which can be used to sense scattered multi-frequency light. Multiple wavelength signals, red, blue green for example, emitted by the camera can be analyzed to determine a degree of airborne particulate matter in a sensing region between the source and the array.

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