Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-06-15
1991-08-27
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
385 33, H01J 516
Patent
active
050435736
ABSTRACT:
An electro-optic power cell for transducing incoming light energy from an optical fiber into electrical energy through a photo diode. An optical fiber extends into a first housing through a wall thereof. A lens in the housing abuts and is sealed to the end of the optical fiber to expand the light beam from the fiber and direct it to a photo diode in engagement with the output end of the lens. A second housing which contains an electrical socket is fastened to the first housing. Leads from the photo diode are connected to the electrical socket so that the electrical signal from the photo diode can be connected to an external electric receptacle. The optical path is hermetically sealed to prevent entry of contaminants. Several embodiments of the photo diode are described in order to perform different functions. One embodiment uses a segmented photo diode having the segments connected in series to increase diode output voltage. Another uses two photo diode segments covered by different bandpass filters so that each responds to a different wavelength of incoming light. The diode segments can be connected to a load with opposite polarity, so that forward to reverse operation may be selected by selecting the wavelength of light conveyed by the optical fiber.
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Gilliam Frank D.
Moog Inc.
Nelms David C.
Shami Khaled
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