Smoke sensor and electronic equipment

Details Smoke sensor and electronic equipment Smoke sensor and electronic equipment

2008-11-14

2010-02-09

Pham, Hoa Q (Department: 2886)

Optics: measuring and testing

For light transmission or absorption

Of fluent material

C250S573000, C340S628000, C340S630000

Reexamination Certificate

active

07659986

ABSTRACT:
In a smoke sensor, a first light-receiving element which receives light from a light-emitting element and is disposed in a position where the quantity of received light changes according to a density of smoke and a second light-receiving element which monitors the quantity of light of the light-emitting element are arranged symmetrically with respect to the light-emitting element. Furthermore, a signal from the first light-receiving element and a signal from the second light-receiving element are amplified by an identical amplifier circuit. In a microcomputer, the density of smoke is computed based on a difference between an output obtained by amplifying an output of the first light-receiving element with the amplifier circuit and an output obtained by amplifying an output of the second light-receiving element with the amplifier circuit.

REFERENCES:
patent: 5598147 (1997-01-01), Mochizuki et al.
patent: 6876305 (2005-04-01), Kadwell et al.
patent: 7483139 (2009-01-01), Powell
patent: 2001/0020899 (2001-09-01), Kadwell et al.
patent: 58-39552 (1983-03-01), None
patent: 59-5398 (1984-01-01), None
patent: 60-33035 (1985-02-01), None

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