Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1978-12-22
1981-07-28
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
350370, 356351, G01C 1964
Patent
active
042807662
ABSTRACT:
An optical gyroscope is described of the type which passes light beams in opposite directions through a single mode fiber optic wave guide that extends in a circle or coil, and which enables measurement of rotation rate of the coil by measuring the relative phase shifts of the beams by interferometric techniques, wherein simplification and enhanced accuracy are obtained. Beam splitting and phase shifting of the light is facilitated by utilizing brief pulses of light and by using light-controlling devices which are operated for a brief time only when the light pulse passes in one direction through the device but not at a different time when the pulse is passing in the opposite direction through the device. High accuracy in rotation measurement is achieved at both very slow and very fast rotation rates, by alternately operating the system so that at zero rotation the interfering waves are alternately 90.degree. out of phase and in phase. Linear polarization of the light beams is maintained by coiling the full length of the optic fiber in a single plane so that bending stresses induce a birefringence in the waveguide, thus altering the propagation constants of the two polarized modes and decoupling them.
REFERENCES:
"Fiber Optic Laser Gyro Signal Detection and Processing Technique"; Martin et al.; Proceedings of the Spie Technical Symposium, Mar. 1978.
Goldstein Raymond
Goss Willis C.
Manning John R.
McCaul Paul F.
McGraw Vincent P.
Mott Monte F.
The United States of America as represented by the Administrator
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