Optics: measuring and testing – By particle light scattering – With photocell detection
Reexamination Certificate
2006-07-11
2006-07-11
Stafira, Michael P. (Department: 2877)
Optics: measuring and testing
By particle light scattering
With photocell detection
C356S364000
Reexamination Certificate
active
07075646
ABSTRACT:
The present invention relates to the detection of particles suspended in fluid particularly smoke detectors suitable for mounting on ducting for the early detection of smoke created by unwanted pyrolysis or combustion of materials in a protected area or fire zone to which the duct is connected. The present invention provides alternately illuminating a detection zone with one of either a first or a second illumination. The improvement embodied in the current invention is the ability to retain sensitivity to a wide range of particle sizes and also to discriminate between different kinds of smoke or dust according to particle size, whilst also achieving relatively long service life, small size, light weight and low cost.
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Kusner & Jaffe
Stafira Michael P.
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