Spliceless optical fiber resonant ring laser gyroscopic system

Details Spliceless optical fiber resonant ring laser gyroscopic system Spliceless optical fiber resonant ring laser gyroscopic system

1983-05-20

1987-07-07

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1964, G01B 902

Patent

active

046783342

ABSTRACT:
A spliceless optical-fiber resonant-ring laser gyroscopic system is disclosed. The spliceless optical-fiber resonant-ring gyroscopic system includes a cylindrically-shaped monolithic housing fashioned from a material having an ultra-low coefficient of thermal expansion. A selected length of optical-fiber is mounted about the perimeter of the cylindrically-shaped housing and closed on itself to form an optical-fiber ring having at least one turn. The spliceless optical-fiber ring and an evanescant-wave directional coupler are provided by bringing the fiber proximate to the ends of the optical-fiber ring in parallel contiguity. A narrow-band gas-discharge helium-neon optical-frequency tunable laser is formed within the monolithic housing and operatively connected to the ends of the spliceless optical-fiber ring via an integrated-optics chip. The integrated-optics chip is operative to excite the spliceless optical-fiber ring in a clockwise and a counterclockwise direction sequentially and alternately at first and second pairs of frequencies in which the frequency separation in each pair is set at approximately the linewidth of the clockwise and the counterclockwise ring resonances, respectively. The mean frequencies of the first pair and the second pair of frequencies are controllably varied until the response of the ring at corresponding clockwise and counterclockwise excitations are each individually balanced. Signal processing means are responsive to the balanced ring responses and operative to compute the rate of angular rotation of the gyroscopic platform from the difference in mean frequencies at which the clockwise and counterclockwise balances occur.

REFERENCES:
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patent: 4120587 (1978-10-01), Vali et al.
patent: 4136929 (1979-01-01), Suzaki
Stokes et al, "All-Single-Mode Fiber Resonator", Optics Letters, vol. 7, #6, Jun. 1982, pp. 288-290.
Cahill et al, "Phase Nulling Optical Gyro", Proceedings of the IEEE 1979 National Aerospace & Electronics Conference, NAECON 1979, Dayton, Ohio, USA, (15-17 May 1979, pp. 8-13).

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