Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1987-08-31
1989-08-15
Orsino, Joseph A.
Communications: electrical
Condition responsive indicating system
Specific condition
250578, 250574, 356438, G08B 1710
Patent
active
048578959
ABSTRACT:
In a combined obscuration and scattered-light smoke detector, light from a light source in a smoke chamber is reflected from an image-forming optical component onto a first light sensor which senses a reduced electrical signal in the presence of smoke while a second sensor, viewing light from the light source at an angle, senses an increased electrical signal in the presence of smoke. The output of each receptor is subjected to a band pass filter, an amplifier and a comparator; the resultant signals insure early and reliable activation of an alarm when even a low level of smoke is present in the smoke detector. A second light source having a wavelength different from that of the first light source provides, in the obscuration mode, added sensitivity to smoke.
REFERENCES:
patent: 3922656 (1975-11-01), Horvath et al.
patent: 3994603 (1976-11-01), Paschedag
patent: 4021792 (1977-05-01), Ludt et al.
patent: 4166960 (1979-09-01), Meili
patent: 4220857 (1980-09-01), Bright
patent: 4300133 (1981-11-01), Solomon
patent: 4547675 (1985-10-01), Muggli et al.
patent: 4647785 (1987-03-01), Morita
patent: 4680756 (1987-07-01), Bauer
Jackson Jill D.
Orsino Joseph A.
LandOfFree
Combined scatter and light obscuration smoke detector does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Combined scatter and light obscuration smoke detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Combined scatter and light obscuration smoke detector will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-124490