Fraunhofer line discriminator

Details Fraunhofer line discriminator Fraunhofer line discriminator

1982-01-25

1984-02-21

Willis, Davis L.

Radiant energy

Luminophor irradiation

250253, F21V 916

Patent

active

044332459

ABSTRACT:
An apparatus for the detection of fluorescence. An airborne optical system carried in an aircraft or spaceship scans a sunlit swath of terrain over a field of view defined by a selected one of the fringe rings of a Fabry-Perot etalon designed to pass a selected Fraunhofer line. A first series of detectors are disposed to sense light intensity over a predetermined arc within said selected ring. A second like series of detectors are disposed to sense light intensity just outside said selected ring. Electronic means are connected to said first and second plurality of detectors for determining the fluorescence reflected from the swath of terrain.

REFERENCES:
patent: 3598994 (1971-08-01), Markle
patent: 3641344 (1972-02-01), Markle
patent: 3769516 (1973-10-01), Markle et al.
patent: 4336459 (1982-06-01), Fay

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