Smoke detector

Details Smoke detector Smoke detector

1979-10-09

1981-05-26

Corbin, John K.

Optics: measuring and testing

By particle light scattering

With photocell detection

250574, 340630, G01N 2153, G08B 1710

Patent

active

042695104

ABSTRACT:
A smoke detector, especially for a fire alarm, comprising a radiation source possessing a substantially conical ring-shaped radiation characteristic or pattern and a radiation receiver arranged along the axis of the radiation source but externally of the direct radiation. The radiation receiver receives radiation which is scattered by smoke particles within the conical ring-shaped radiation region. In order to reduce the spurious radiation impinging on the radiation receiver the radiation region is bounded by elements located externally of the direct receiving region of the radiation receiver. Web means (which comprise the bounding elements opposite the radiation source) are provided which are specially-shaped to prevent dust from collecting on their radiation receiving surfaces, thereby keeping the smoke detector from becoming increasingly susceptible with time to the triggering of false alarms as the deposition of dust at the inner surface of the fire detector housing increases.

REFERENCES:
patent: 3185975 (1965-05-01), Kompelien
patent: 4181439 (1980-01-01), Tresch et al.
Smith, W. J., Modern Optical Engineering, McGraw-Hill, pp. 128-131, New York.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-451506