Detection system to determine the transmissivity of a medium wit

Details Detection system to determine the transmissivity of a medium wit Detection system to determine the transmissivity of a medium wit

1975-02-14

1976-11-30

McGraw, Vincent P.

Optics: measuring and testing

Inspection of flaws or impurities

Bore inspection

250575, 340237S, 356206, 356207, 356208, G01N 2122, G01N 2112, G01N 2126

Patent

active

039946037

ABSTRACT:
To eliminate sources of error in fire detection apparatus regarding variation of light output from a radiation cell, and to eliminate varying ambient conditions such as dust and dirt contamination of reflectors and transducers, the radiation is directed over at least two paths by reflectors which are located such that the numbers of reflections in the paths and the reflection points are the same, whereas the lengths of the paths are different, and evaluating the difference signal to obtain a measure of the density of the medium through which the paths extend, typically the transmissivity of air which may be contaminated by smoke. In one embodiment, reflectors are located in the corners of a polygon, one of the paths extending across the polygon, and the other path extending essentially circumferentially thereof.

REFERENCES:
patent: 3566385 (1971-02-01), Lawson
patent: 3872315 (1975-03-01), Boll
patent: 3880526 (1975-04-01), Kobayashi et al.

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