Apparatus for measuring the optical transmissive power of the at

Details Apparatus for measuring the optical transmissive power of the at Apparatus for measuring the optical transmissive power of the at

1978-05-26

1980-09-30

Corbin, John K.

Optics: measuring and testing

For light transmission or absorption

Of fluent material

250205, G01N 2122

Patent

active

042252458

ABSTRACT:
An apparatus for measuring the optical transmissive power of the atmosphere, having particular application to measuring visibility at airports, in which luminous flux from a source passes to a remote first detector through the atmosphere, and flux from the source also passes to a second detector through a fibre optic arrangement. The output of the second detector is compared with a reference signal and the difference signal from the comparator is fed to a variable gain amplifier which controls the light source to remove errors in the output of the first detector which would otherwise occur by virtue of aging of the detectors and/or by virtue of changes in the luminosity of the source. Also described is an arrangement for compensating for accumulation of dirt on the detectors and/or the luminous flux source without cleaning off the dirt.

REFERENCES:
patent: 3329821 (1967-07-01), Lesage
patent: 3422271 (1969-01-01), Fuhrmann
patent: 3670202 (1972-06-01), Paine et al.
patent: 3698820 (1972-10-01), Hanff et al.
patent: 3746452 (1973-07-01), Teboul et al.
patent: 3838925 (1974-10-01), Marks
patent: 4095098 (1978-06-01), Looper

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