Double-ring parallel resonant gyro system and double-closed-loop digital demodulation method thereof

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

Active Publication Date: 2020-08-14
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • Double-ring parallel resonant gyro system and double-closed-loop digital demodulation method thereof
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  • Double-ring parallel resonant gyro system and double-closed-loop digital demodulation method thereof

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Embodiment 1

[0030] figure 1It is a schematic structural diagram of a double-loop parallel resonant gyro system provided by an embodiment of the present invention. The double-loop parallel resonant gyro system includes a tunable laser Laser, and the light emitted by the tunable laser Laser passes through the signal beam splitter Coupler1 Carry out beam splitting (two paths of clockwise and counterclockwise light), one of which enters the acousto-optic frequency shifter AOM1, electro-optic modulator EOM1, 2×2 fiber coupler Coupler2, photodetector PD1, digital lock-in amplifier LIA1, And the amount of frequency shift is controlled by the acousto-optic frequency shifter AOM1 to form a closed-loop feedback, in which the 2×2 fiber coupler Coupler2 is coupled with a hollow-core photonic bandgap fiber resonator HC-PBG FRR1; the other light enters the acousto-optic frequency shifter in turn AOM2, electro-optic modulator EOM2, 2×2 fiber coupler Coupler3, photodetector PD2, digital lock-in amplifier...

Embodiment 2

[0041] This embodiment provides a double-closed-loop digital demodulation method for a double-loop parallel resonant gyro system. The method is based on the system described in Embodiment 1, and the method includes the following steps:

[0042] Step 1: The optical signal output by the hollow-core photonic bandgap fiber resonator HC-PBG FRR2 is converted into an electrical signal by the photodetector PD2, and the corresponding electrical signal is input to the digital lock-in amplifier LIA2, and the reference signal of the digital lock-in amplifier LIA2 is frequency for f 2 The sinusoidal signal, the demodulated output signal ΔD 2 and the difference Δf cw In direct proportion, the proportional coefficient is k 2 , Δf cw is the difference between the optical frequency in the cw direction and the resonant frequency in the cw direction, that is, ΔD 2 =k 2 ·Δf cw , the tunable laser Laser according to the demodulated digital signal ΔD 2 Δf on the output optical frequency La...

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Abstract

The invention discloses a double-ring parallel resonant gyro system and a double-closed-loop digital demodulation method thereof. The system comprises a tunable laser, outgoing light of the tunable laser is split into clockwise light and anticlockwise light through a signal beam splitter, the clockwise light and the anticlockwise light sequentially enter an acousto-optic frequency shifter, an electro-optic modulator, an optical fiber coupler, a hollow photonic band gap optical fiber resonant cavity, a photoelectric detector and a digital lock-in amplifier respectively, and frequency closed-loop feedback is formed through the tunable laser and the acousto-optic frequency shifter respectively. According to the double-ring hollow photonic band gap optical fiber structure, clockwise and anticlockwise light waves are respectively propagated in the independent resonant cavities without mutual influence, so that the temperature stability is improved, and nonreciprocal effect noises such as anoptical Kerr effect, Rayleigh backscattering and the like are effectively inhibited. According to the double-closed-loop digital demodulation method, optical frequencies in a clockwise optical path and an anticlockwise optical path are locked at respective transmission resonant frequencies, so that the system works in a linear region, and the linear range of angular velocity detection of the system and the linearity of a scale factor are effectively improved.

Description

technical field [0001] The invention relates to the technical field of resonant fiber optic gyroscopes, in particular to a double-loop parallel resonant gyroscope system and a double-closed-loop digital demodulation method thereof. Background technique [0002] As a high-precision angular velocity sensor, the resonant fiber optic gyroscope can achieve high-precision measurement of angular velocity by detecting the resonant frequency difference generated by the Sagnac effect, which is the focus of current research in the field of fiber optic gyroscopes. Compared with the interferometric fiber optic gyroscope, the resonant fiber optic gyroscope can achieve the same detection accuracy of the interferometric fiber optic gyroscope under hundreds of meters of fiber optic rings through a single-turn fiber optic resonator through the multi-beam interference enhancement effect, avoiding factors such as temperature and stress unevenness. Non-reciprocity is conducive to system miniatur...

Claims

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Application Information

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Patent Type & Authority Applications(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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