Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1990-02-14
1992-03-24
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
G01C 1972
Patent
active
050981889
ABSTRACT:
To overcome Kerr effect induced gyro bias in a ring resonator optical gyro, the intensities of the beams travelling in opposite directions around the ring have to be very accurately matched. To achieve this a ring resonator gyro includes a first optical coupler (6), the coupling ratio of which is variable and which divides light from a laser (1) into a first and a second component of generally equal intensity, a second optical coupler (8) which transmits a predetermined proportion of the first component to one input of the ring resonator (15) for transmission around the ring resonator (15) in one sense, and a third optical coupler (9), the coupling ratio of which is variable to couple a variable proportion of the second component to the other input of the ring resonator (15) for transmission around the ring resonator (15) in the opposite sense. The gyro also includes a detector (16) for sensing the intensity of light scattered from the optical ring resonator (15), a square wave generator (40) for periodically varying the coupling ratio of the first coupler (6), sample and hold circuits (45-48) responsive to the output of the detector (16) as the coupling ratio of the first coupler (6) is varied to sense the difference in intensity in the first and second components travelling around the ring (15), and second square wave generator (41) to vary the coupling ratio of the third optical coupler (9) and thus the intensity of the second component during alternate periods so that the time averaged intensity of both the first and second components are equal.
REFERENCES:
patent: 4825261 (1989-04-01), Schroeder
British Aerospace PLC
McGraw Vincent P.
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