Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1991-04-12
1995-01-24
Hellner, Mark
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
G01B 902
Patent
active
053846370
ABSTRACT:
An amplitude reset controller for a resonator fiber optic gyroscope using a feedback loop and modulation to control amplitudes of a serrodyne waveform provided by a serrodyne signal generator at an operation frequency depending on resonance conditions in the resonator. The controller with a single serrodyne signal generator switches between such control at greater rotation rates and the removal of such control at smaller rotation rates, using instead a reference command. Also, a blanking operation mode can be additionally used to eliminate signals controlling the controlled frequency adjustment signal generator operation frequency during phase resets in its output serrodyne signal.
REFERENCES:
patent: 4705399 (1987-11-01), Graindorge et al.
patent: 4825261 (1989-04-01), Schroeder
"Resonator Fiber-Optic Gyro Using LiNbO.sub.3 Integrated Optics at 1.5-.mu.m Wavelength," Sanders et al, Proceedings of SPIE, vol. 985, pp. 202-210, (1985).
"Double Closed-Loop Hybrid Fiber Gyroscope Using Digital Phase Ramp," Lefevre et al, Proceedings of 3rd International Conference Optical Fiber Sensors, Technical Digest Series, PDS 7.1-7.8 (1985).
"Serrodyne Modulator in a Fibre-Optic Gyroscope," Kay, IEEE Proceedings J. of Optoelectronics, 132 (Part J, No. 5), pp. 259-264, (1985).
"Closed-Loop Fiber-Optic Gyroscope with a Sawtooth Phase-Modulated Feedback," Ebberg et al, Optics Letters, vol. 10, No. 6, pp. 300-302, Jun. 1985.
"Lithium Niobate Serrodyne Frequency Translator for Fiber-Optic Gyroscopes," Johnson et al, SPIE Fiber Optic Gyros: 10th Anniversary Conference, vol. 719 (1986).
Sanders Glen A.
Strandjord Lee K.
Hellner Mark
Honeywell Inc.
Shudy Jr. John G.
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