Quadrature demodulation with synchronous difference for interferometric fiber-optic gyroscopes
TLDR
Both short term noise and long term instability of the IFOG are reduced by this novel method of quadrature demodulation with synchronous difference for suppressing noise in interferometric fiber-optic gyroscopes (IFOGs).Abstract:
We propose a novel method of quadrature demodulation with synchronous difference for suppressing noise in interferometric fiber-optic gyroscopes (IFOGs). For an IFOG with sine wave phase modulation, an in-phase result and a quadrature result are obtained simultaneously by coherent detection. Eigenfrequency modulation is used and a phase shift of 45° is set between the modulation signal and the reference signal, so that two results have the same expectation of amplitude but with opposite signs. A synchronous difference procedure is carried out for output, in which signals are added up and common noise between two results is eliminated. Theoretical analysis and experimental results show that both short term noise and long term instability of the IFOG are reduced by this method. In experimental comparison with the traditional demodulation method on the same IFOG with a 1982 m fiber coil, this method reduces the bias drift from 0.040°/h to 0.004°/h.read more
Citations
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Dual-polarization interferometric fiber-optic gyroscope with an ultra-simple configuration
TL;DR: A novel dual-polarization interferometric fiber-optic gyroscope (IFOG), which needs only one coupler and no polarizer, which achieves a bias instability of 0.02°/h in detecting the Earth's rotation rate.
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All-Depolarized Interferometric Fiber-Optic Gyroscope Based on Optical Compensation
TL;DR: In this article, a depolarized interferometric fiber-optic gyroscope (IFOG) was proposed to suppress errors induced by polarization nonreciprocity.
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Optically compensated polarization reciprocity in interferometric fiber-optic gyroscopes.
TL;DR: It is shown that the PN errors at the nonreciprocal port are effectively eliminated by optical compensation, and with this unique property, the optically compensated IFOG can possess two low-PN ports for rotation sensing at the same time.
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Navigation-grade resonant fiber-optic gyroscope using ultra-simple white-light multibeam interferometry
TL;DR: In this paper , a white-light multibeam interference method is proposed to detect the Sagnac effect, representing the simplest scheme of RFOG to date, avoiding the complexity caused by multiple feedback loops and coherent noise suppression.
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Influences of optical-spectrum errors on excess relative intensity noise in a fiber-optic gyroscope
Yue Zheng,Chunxi Zhang,Lijing Li +2 more
TL;DR: In this paper, the power spectral density of the excess RIN under the influences of different optical errors in the fiber-optic gyroscope has been theoretically analyzed, which can be used to optimize the configurations of the existing RIN-suppression methods.
References
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