A double-loop parallel resonant gyroscope system and its double-closed-loop digital demodulation method

A gyroscopic system, resonant technology, applied in Sagnac effect gyroscopes, gyroscopes/steering sensing devices, instruments, etc., can solve scale factor nonlinearity, backscatter noise, optical Kerr effect noise output The performance is greatly affected by temperature and the dynamic measurement range of the system is narrow, so as to achieve the effect of suppressing backscattering, improving environmental temperature adaptability, and suppressing optical Kerr effect noise.

Active Publication Date: 2022-01-18
ZHEJIANG UNIV
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to provide a double-loop parallel resonant gyroscope system and a double-closed-loop digital demodulation method to solve the backscattering noise and optical Kerr effect noise in the common single-mode fiber single resonator system existing in the prior art And the problem that the output performance is greatly affected by temperature; at the same time, it solves the problems of narrow dynamic measurement range and non-linear scale factor in the traditional single closed-loop digital demodulation method

Method used

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  • A double-loop parallel resonant gyroscope system and its double-closed-loop digital demodulation method
  • A double-loop parallel resonant gyroscope system and its double-closed-loop digital demodulation method
  • A double-loop parallel resonant gyroscope system and its double-closed-loop digital demodulation method

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Embodiment 1

[0030] figure 1Is a schematic structure of a parallel resonator gyroscope bicyclic system according to an embodiment of the present invention, the one parallel resonator gyroscope bicyclic system, including Laser tunable laser, the tunable laser Laser light emitted by a signal splitter Coupler1 for splitting (cis, two optical counter-clockwise), wherein a beam of light in order to enter the acousto-optic frequency shifter AOM1, electro-optic modulator EOM1,2 × 2 optical coupler Coupler2, photodetector PD1, a digital lock-in amplifier lia1, and forming a closed loop feedback through the acoustic optical frequency shifter AOM1 control the frequency shift amount, wherein the coupling connector on 2 × 2 optical fiber coupler Coupler2 hollow photonic bandgap fiber resonator HC-PBG FRR1; another path of the light sequentially enters the acousto-optic frequency shifter AOM2, electro-optic modulator EOM2,2 × 2 optical coupler Coupler3, photodetector PD2, digital lock-in amplifier lIA2, a...

Embodiment 2

[0041] Dual closed-loop digital demodulation method of the parallel resonator gyroscope bicyclic system provided in the present embodiment, the steps of the method based on the system of the embodiment 1, the method comprising:

[0042] Step a: photonic bandgap optical signal hollow fiber resonator HC-PBG FRR2 output converted into an electrical signal by the photodetector PD2, and the corresponding electrical signal is input to a digital lock-in amplifier lia2, digital lock-in amplifier as a reference signal frequency lia2 to f 2 Sinusoidal signals, demodulated output signal ΔD 2 The difference Δf cw Proportional, the proportionality coefficient is k 2 , Δf cw The resonance frequency of the cw direction cw-directional optical frequency difference, i.e. ΔD 2 = K 2 · Δf cw , Laser tunable laser according to the demodulated digital signal ΔD 2 The output light frequency Δf Laser Adjusting the frequency shift, Δf wherein cw = Δf Laser Such cw optical path of the light frequency locke...

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Abstract

The invention discloses a double-loop parallel resonant gyroscope system and a double-closed-loop digital demodulation method thereof, including a tunable laser Laser, and the output light of the tunable laser is split into two paths of clockwise and counterclockwise light by a signal beam splitter. Enter the acousto-optic frequency shifter, electro-optic modulator, fiber coupler, hollow photonic bandgap fiber resonator, photodetector, digital lock-in amplifier in sequence, and form a frequency closed-loop feedback through the tunable laser and the acousto-optic frequency shifter respectively . The double-ring hollow-core photonic bandgap fiber structure allows clockwise and counterclockwise light waves to propagate independently in independent resonant cavities, which can improve temperature stability and effectively suppress non-reciprocal effects such as optical Kerr effect and Rayleigh backscattering noise. The double-closed-loop digital demodulation method locks the optical frequencies in the forward and counterclockwise optical paths at their respective transmission resonant frequencies, making the system work in the linear region, effectively improving the linear range of angular velocity detection and the linearity of the scale factor.

Description

Technical field [0001] The present invention relates to a resonator fiber optic gyro technology, and more particularly, to a parallel resonator gyroscope bicyclic dual closed-loop system and a digital demodulation method. Background technique [0002] Resonator fiber optic gyro as an angular velocity sensor with high accuracy, high precision measurement of angular velocity by detecting the frequency difference between the resonance produced by the Sagnac effect, is the focus of research FOG art. Than interferometric fiber optic gyro, resonator fiber optic gyro is enhanced by multi-beam interference effect, the same interferometric fiber optic gyro detection accuracy in a few hundred meters can be achieved by a single optical fiber loop fiber ring resonator, the temperature is avoided, the uneven stress caused by such factors non-reciprocity, in favor of miniaturization and system integration. [0003] Resonator Fiber Optic Gyro there are still laboratory prototype stage, is not y...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C19/72
CPCG01C19/725G01C19/727
Inventor 周一览邹康毕然缪立军李楠陈侃舒晓武
Owner ZHEJIANG UNIV
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