FIRE ALARM SYSTEM WITH SMOKE PARTICLE IDENTIFYING FUNCTION

Japanese Patent JP3860635

B2

PROBLEM TO BE SOLVED: To prevent the generation of erroneous alarm due to transient noise by preventing the starting of an informing part even when a signal generated by dust particles within a smode detection is received so as to operate the detector with highest sensitivity.
SOLUTION: The light source 30-1 of the coherent light of high luminance such as a laser or laser diode is mounted on a housing or a chamber 30, and an optical sensor 30-7 detects a part of light beams scattered by the particle 6 of smoke to convert a light signal to an electrical signal. An electronic circuit within the detector is transmitted to a control panel or a controller 12. This detector generates only a transient output signal in response to the existence of dust even at the time of being exposed to a dust environment. It is because intervals mutually between dust particles are larger than the size of a light beam 30-3. Then the controller, etc., includes a microprocessor 14 and a control program and processes a signal waveform received from a sensor 30 in order to remove a non-fire signal generating a prescribed waveform.

Donald Dee Anderson
Retired

JP35032696A

December 20, 2006

December 27, 1996

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Pitway Corporation

G01D1/12; G08B17/103; G01D3/032; G01J1/42; G01N15/06; G01N21/53; G01R19/00; G08B17/00; G08B17/107; G08B25/00; G08B29/18; (IPC1-7): G08B17/103; G01N15/06; G01N21/53

JP7151680A
JP5073781A
JP5282585A

Minoru Nakamura
Fumiaki Otsuka
Shishido Kaichi
Hideto Takeuchi
Toshio Imajo
Nobuo Ogawa
Village shrine Atsuo

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