Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1991-08-20
1993-07-06
Ng, Jin F.
Communications: electrical
Condition responsive indicating system
Specific condition
340630, 250574, G08B 1712
Patent
active
052258106
ABSTRACT:
A fire detection apparatus discriminates white smoke, black smoke and flame in a protected area based on changing characteristics of optically measured distances. The apparatus includes a distance meter having a light emitter for emitting a pulse of light energy towards a reference object, such as a distant wall, and a light detector for receiving the pulse of light energy reflected from the reference object or any intervening object. A distance to the reference object or the intervening object is determined based on the lapse of time from the emission to the detection of the pulse of light energy. White smoke is deemed detected when the distance measured is less than a reference difference and is substantially free of fluctuations. Black smoke is detected when the distance measured is more than the reference distance and is also substantially free of fluctuations. Flame is detected when the distances measured differ from the reference distance and fluctuates substantially.
REFERENCES:
patent: 3444544 (1969-05-01), Pearson
patent: 3980997 (1976-09-01), Berns
patent: 4893026 (1990-01-01), Brown de Colstoun
Igarashi Yoshinori
Inoue Masao
Ng Jin F.
Nohmi Bosai Ltd.
Oda Christine K.
LandOfFree
Fire detector for discriminating smoke and flame based on optica does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fire detector for discriminating smoke and flame based on optica, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fire detector for discriminating smoke and flame based on optica will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1693125