Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-08-18
1990-08-21
McGraw, Vincent P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
350389, G02F 103
Patent
active
049508849
ABSTRACT:
A device and method for modulating light intensity in response to a varying electrical signal which is particularly useful with optical fiber information sensing systems. The device includes a number of components positioned in seriatim in an elongated cavity in an insulating body. Means for receiving a light signal, such as from an optical fiber, is positioned at one end of the cavity. A lens receives the light and collimates it into a narrow collimated beam directed through the cavity. The beam is polarized, retarded by a wave plate to circular polarization and passed through a modulator material which is capable of rotating beam polarization in response to varying voltage signals imposed on the modulator through electrodes thereon. A mirror at the end of the modulator reflects the beam back through the system. The beam is further rotated by electro optic material as a function of applied voltage, then further retarded by said wave plate and then attenuated by said polarizer as a function of the applied voltage. The returning attenuated beam is then focused into the optical fiber.
REFERENCES:
patent: 2616962 (1952-11-01), Jaffe
patent: 3346319 (1967-10-01), Billings
patent: 3900246 (1975-08-01), Kimura et al.
patent: 4421383 (1983-12-01), Carlsen
patent: 4547774 (1985-10-01), Gould
patent: 4554449 (1985-11-01), Taniuchi et al.
Gilliam Frank D.
McGraw Vincent P.
Moog Inc.
Turner S. A.
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