Optical fire-detector

Details Optical fire-detector Optical fire-detector

1977-08-04

1979-05-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340680, 356438, G01N 2126

Patent

active

041568168

ABSTRACT:
The invention relates to an optical fire-detector in which a radiation-emitting means is arranged to emit a beam of radiation and which has modulator means for the modulation of the beam of radiation in a phase-inverted relationship within a first and a second wavelength band, and a radiation-detecting means is arranged to receive the beam of radiation after it has passed through an intermediate air medium and includes first means for an individual measurement of intensity in the two wavelength bands and second means for the detection of such variations in the measured intensities which are representative for a fire.

REFERENCES:
patent: 3796887 (1974-03-01), Vincent et al.
patent: 3982130 (1976-09-01), Trumble
patent: 4001595 (1977-01-01), Reisman

Affiliated with

Also associated with

Rating

Optical fire-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 Optical fire-detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical fire-detector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-231831