Optics: measuring and testing – By shade or color
Patent
1989-12-26
1991-06-18
Evans, F. L.
Optics: measuring and testing
By shade or color
356419, 350170, G01J 346, G01N 2125, G02B 2712
Patent
active
050245309
ABSTRACT:
Optical radiation generated by an auroral event is gathered by a fish-eye optical objective (12, 21, 22) and focussed by a telecentric lens (23) to a focal region where a two-passband filter (24) is located. The filter (24) passes two narrow bands of optical radiation, each band of which is centered on a specified wavelength. Rays in the two specified wavelengths are passed by a condenser lens (25) and a collimator lens (26) through an aperture stop in which a blocking filter (27) is located. The blocking filter (27) comprises two side-by-side half-size filters, each of which transmits a corresponding one and suppresses the other of the two specified wavelengths. A prism (28) diffracts rays each of the specified wavelengths by a different amount so that separated images in the two specified wavelengths are formed. A reimaging lens (29) relays the separate images to correspondingly different portions of a detector (30).
REFERENCES:
patent: 4146332 (1979-03-01), Moore
patent: 4609286 (1986-09-01), Sage, Jr.
patent: 4768853 (1988-03-01), Bhagavatula
Instrument for the Monochromatic Observation of all Sky Auroral Images, Mende et al, Applied Optics, Jun. 11, pp. 1691-1700.
A Large Aperture-High-Resolution Fabry-Perot, Spect. for Airglow Studies, Bower et al., 1980, Institute of Physics, pp. 562-567.
Polarization Fourier Spectrometer for Astronomy, A'tlearn et al, Applied Optics, May 1974, vol. 13, pp. 1147-1156.
Double Grating Prisms, Nelles, Optik, Aug. 1984, pp. 152-154.
Spectrophotometry of Faint Light Sources; Eather, Applied Optics, Feb. 1969, pp. 227-242.
Evans F. L.
Hantis K. P.
Lockheed Missiles & Space Company Inc.
Morrissey John J.
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