Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1975-10-24
1976-09-07
Smith, Alfred E.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356206, G01N 2126, G01N 2106
Patent
active
039795969
ABSTRACT:
A coronametric instrument includes first and second optical axes respectively responsive to first and second fields of view slightly removed from the sun. The first optical axis is adapted to be pointed at the sun, while the second axis is slightly angularly displaced from the first, having an intersection approximately at an entrance aperture of the instrument. On the first axis first and second occulting discs are respectively positioned in front of and behind the entrance aperture. The first occulting disc shades the entrance aperture from direct solar radiation. A lens system and the discs are arranged so that a slightly out of focused image of the first disc is formed on the second disc so that the second disc absorbs light diffracted from the first disc. An annular image of the sky surrounding the sun is defined by apertures; light passing through these apertures is projected on a first photodetector which derives a signal indicative of the circumsolar sky intensity slightly angularly displaced from the sun's limb. On the second axis is positioned a second aperture having an area equal to the area of the annular aperture formed at the second occulting disc; behind the second aperture is a second photodetector responsive to the radiation intensity within a partial annular field of view slightly removed from the sun. An interference filter having a relatively narrow bandwidth is provided in proximity to the entrance aperture to intercept light projected along both axes.
REFERENCES:
patent: 3614231 (1971-10-01), Shaw
patent: 3700333 (1972-10-01), Charlson et al.
Deehr Charles S.
Shaw Glenn E.
Moore David K.
Smith Alfred E.
The United States of America as represented by the Administrator
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