Photoelectric smoke detector with means for adjusting the amount

Details Photoelectric smoke detector with means for adjusting the amount Photoelectric smoke detector with means for adjusting the amount

1975-04-11

1976-11-16

McGraw, Vincent P.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

250574, 340237S, 356107, G01N 2100

Patent

active

039921026

ABSTRACT:
In a photoelectric smoke detector of the type wherein the quantity of light incident upon a light receiving element from a light source is varied in accordance with the concentration of the smoke to be detected thereby producing an electric signal, there are provided a light shielding member for preventing the light from the light source from impinging directly upon the light receiving element and an adjusting screw located near top of the light shielding member for adjusting the quantity of the light projecting to the detection region from the light source and the quantity of the reflected light impinging upon the light receiving element from the smoke.

REFERENCES:
patent: 3240109 (1966-03-01), Grant, Jr.
patent: 3710365 (1973-01-01), Barnes
patent: 3723747 (1973-03-01), Steele
patent: 3868184 (1975-02-01), Marsocci

Affiliated with

Also associated with

Rating

Photoelectric smoke detector with means for adjusting the amount does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Photoelectric smoke detector with means for adjusting the amount, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photoelectric smoke detector with means for adjusting the amount will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-668277