Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-06-27
1989-07-25
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250216, 35016211, G01J 350, H01J 516, H01J 4014
Patent
active
048516643
ABSTRACT:
An optical interference filter has narrow linewidth and wide acceptance ae and includes a hemisphere coated to provide a narrow bandpass filter at a desired wavelength at normal incidence while other wavelengths at normal incidence are absorbed or reflected. A photodetector placed at the center of the hemisphere detects the desired wavelength only. Other wavelengths that are shorter than the wavelength of the filter are transmitted through the filter to be absorbed by a black absorbing surface around the photodetector. Thus, only the frequency of interest at normal incidence provides a representative signal at the detector.
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patent: 3278752 (1966-10-01), Brixner
patent: 3588245 (1971-06-01), Herriott
patent: 3681608 (1972-08-01), Derderian et al.
patent: 3717399 (1973-02-01), Taylor et al.
patent: 3976875 (1976-08-01), Engstrom et al.
patent: 4158133 (1979-06-01), Spaeth et al.
patent: 4225782 (1980-09-01), Kuppenheimer, Jr. et al.
patent: 4554448 (1985-11-01), Sillitto
patent: 4806747 (1989-02-01), Dunavan et al.
Chatman Eric F.
Fendelman Harvey
Keough Thomas G.
Nelms David C.
United States of America as represented by the Secretary of the
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