Apparatus for determining the transmissivity of an optical mediu

Details Apparatus for determining the transmissivity of an optical mediu Apparatus for determining the transmissivity of an optical mediu

1977-02-17

1978-09-05

McGraw, Vincent P.

Optics: measuring and testing

Inspection of flaws or impurities

Bore inspection

250575, G01N 2122, G01N 2126

Patent

active

041115597

ABSTRACT:
Three photometers are positioned at three points P.sub.1, P.sub.2 and P.s3, aligned with each other and with an illuminating flare, and located at equal distances d from each other, with the middle photometer at a distance D, greater than d, from the flare; the illuminations E.sub.1, E.sub.2, and E.sub.3 simultaneously received by the three photometers from the flare are recorded; and the transmissivity T, or transmission per mile, of the atmosphere traversed by the light is calculated from the formula: ##EQU1## where the E values are in foot candles and d is in miles.

REFERENCES:
patent: 3619624 (1971-11-01), Sorenson
G. T. Schappert, Technique for Measuring Visibility, 10/71, pp. 2325-2328.

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