Acoustic particle alarm including particle sensor

Details Acoustic particle alarm including particle sensor Acoustic particle alarm including particle sensor

2005-10-19

2008-12-09

Hofsass, Jeff (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C073S053010, C073S861180, C073S861210, C702S128000, C702S129000

Reexamination Certificate

active

07463158

ABSTRACT:
The present invention provides an acoustic particle alarm comprising a particle sensor for indicating the concentration of particles exceeding a specified size and specified concentration, for particles entrained in a fluid flow impinging on a front face of the sensor, and a nozzle for directing the fluid flow such that the particles impact the sensor in a direction substantially normal to the front face of the sensor. Each particle impacting the front face of the sensor causes a response in an output of the sensor with amplitude that is monotonic in the momentum of the impinging particle.

REFERENCES:
patent: 3765771 (1973-10-01), Shaw
patent: 4240287 (1980-12-01), Mast et al.
patent: 5257530 (1993-11-01), Beattie et al.
patent: 5969236 (1999-10-01), Hirota et al.
patent: 6561005 (2003-05-01), Muller et al.
patent: 2005/0175508 (2005-08-01), Hill

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