Arrangement for determining visibility in the glide path of an a

Details Arrangement for determining visibility in the glide path of an a Arrangement for determining visibility in the glide path of an a

1975-03-17

1976-10-12

McGraw, Vincent P.

Optics: measuring and testing

Inspection of flaws or impurities

Bore inspection

250575, 356207, G01N 2122

Patent

active

039854523

ABSTRACT:
For determining oblique visibility, for example on an airport, a light emitter emits a light beam and is coupled with a light receiver. A plurality of devices are located at different, known distances from the light receiver, which launch measuring bodies substantially vertically with a predetermined height for each of the units. The measuring bodies are arranged to reflect the light emitted from the light emitter back to the light receiver where the visibility is sufficient. The devices are operated sequentially.

REFERENCES:
patent: 3126521 (1964-03-01), Brady
patent: 3694936 (1972-10-01), Ling et al.

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