Smoke detectors

Details Smoke detectors Smoke detectors

2007-09-28

2009-02-24

Larkin, Daniel S (Department: 2856)

Measuring and testing

Vibration

Acoustic levitation

C073S024020, C073S028010, C073S031010, C073S031020, C073S031030, C340S628000, C340S629000, C340S630000

Reexamination Certificate

active

07493816

ABSTRACT:
An aspirated smoke detector includes a flow path and a generator of acoustic waves in the flow path. Airborne particulate matter in the flow path responds to the acoustic field by particle agglomeration; the resulting larger particles flow into a photoelectric-type smoke sensor. A sensed level of particles can be processed, or compared to one or more predetermined thresholds to establish presence of one or more predetermined conditions.

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