Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1985-09-24
1987-05-05
LaRoche, Eugene R.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
250231GY, G01B 902
Patent
active
046627510
ABSTRACT:
An improved optical gyroscope is provided, of the type that passes two light components in opposite directions through an optic fiber coil, and which adds a small variable frequency to one of the light components to cancel the phase shift due to rotation of the coil. The amount of coil rotation from an initial orientation, is accurately determined by combining the two light components, one of which has a slightly increased frequency, to develop beats that each represent a predetermined angle of rotation. The direction of rotation is obtained by combining the two light components on a photodetector, intermittently phase shifting a single light component by 90.degree., and comparing the direction of change of photodetector output (+ or -) caused by the 90.degree. shift, with the slope (+ or -) of the photodetector output at about the same time, when there is a 90.degree. shift.
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Bartman Randall K.
Goss Willis C.
Nerheim Noble M.
Youmans Bruce R.
Jones Thomas H.
LaRoche Eugene R.
Manning John R.
McCaul Paul F.
Mottola Steven J.
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