Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1979-09-20
1982-04-27
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
G01C 1964
Patent
active
043268030
ABSTRACT:
A passive ring resonator laser gyro includes a thin film, passive waveguide adapted to provide a closed, substantially circular propagation path for optical signals. Couplers are provided for coupling coherent optical signals in opposite directions in the waveguide. Frequency controllers for each of the counter-rotating optical signals are adapted to adjust the frequencies of the respective signals in the waveguide to achieve resonance along the optical path encountered by each of the signals. Detectors provide signals representative of the frequency shifts of the two counter-rotating optical signals in the waveguide. These signals are nulled by servos which apply correcting frequencies to the frequency controllers. A difference network generates a rate signal corresponding to the difference in frequency between the signals applied to the controllers. The rate signal is representative of the angular rotation rate of the waveguide.
REFERENCES:
patent: 3328595 (1967-06-01), Todd, Jr.
patent: 3778163 (1973-12-01), Forward
patent: 3915019 (1975-10-01), Zoltan
patent: 4120588 (1978-10-01), Chaum
patent: 4135822 (1979-01-01), Ezekiel
patent: 4273445 (1981-06-01), Thompson et al.
"Passive Ring Resonator Laser Gyroscope"; Ezekiel et al., Applied Physics Letters, vol. 30, No. 9, May 1, 1977, pp. 478-480.
"The Laser Gyro"; Killpatrick, IEEE Spectrum, vol. 4, Oct. 1967, pp. 44-53.
"Regenerative Circulatory Multiple-Beam Interferometer for the Study of Light-Propagation Effects", Rosenthal, J.O.S.A., vol. 52, No. 10, Oct. 1962, pp. 1143-1148.
McGraw Vincent P.
Northrop Corporation
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