Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1979-07-24
1982-01-05
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250211J, 356222, 356223, 356402, 357 30, G01J 142, G01J 346, H01L 2714
Patent
active
043096042
ABSTRACT:
Disclosed is a solid state wavelength detection system responding to output signals derived from a photoelectric semiconductor device. The photoelectric semiconductor device comprise at least two PN junctions formed at different depth from the surface of the semiconductor substrate. A deeper PN junction develops an output signal related to longer wavelength component of the light impinging thereon. A shallower PN junction develops an output signal related to shorter wavelength component of the impinging light. These two output signals are logarithmically compressed and compared with each other. Difference of the logarithmically compressed output signals represents the wavelength information of the impinging light.
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patent: 3724954 (1973-04-01), Dreyfoos, Jr.
patent: 3743430 (1973-07-01), Riggs
patent: 3885880 (1975-05-01), Tsunekawa et al.
patent: 3987298 (1976-10-01), Rotolante
patent: 4011016 (1977-03-01), Layne et al.
Aso Akira
Kawanabe Hitoshi
Tani Zempei
Yoshikawa Toshihumi
Nelms David C.
Sharp Kabushiki Kaisha
Westin Edward P.
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