Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1989-10-17
1991-03-05
Tarcza, Thomas H.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
G01B 202
Patent
active
049972820
ABSTRACT:
A fiber optic gyroscope includes a sensing coil formed of ordinary single mode fiber and a module including polarization maintaining optical fibers. A clockwise beam guided by a polarization maintaining fiber passes through a polarizer before being input to the sensing coil. The polarization module includes means for providing an unpolarized counterclockwise beam to the sensing coil and means for phase modulating a predetermined polarization component. The module also depolarizes the clockwise beam after it has transversed the sensing coil. The clockwise and counterclockwise waves are both unpolarized when they combine in an optical coupler before impinging upon a detector that produces an electrical signal indicative of changes in the interference pattern to indicate rotation of the coil.
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Hellner Mark
Litton Systems Inc.
Tarcza Thomas H.
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