CN103411597B - A kind of interfere type closed-loop fiber optic gyroscope instrument based on circulation multi-turn effect - Google Patents
A kind of interfere type closed-loop fiber optic gyroscope instrument based on circulation multi-turn effect Download PDFInfo
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- CN103411597B CN103411597B CN201310310032.7A CN201310310032A CN103411597B CN 103411597 B CN103411597 B CN 103411597B CN 201310310032 A CN201310310032 A CN 201310310032A CN 103411597 B CN103411597 B CN 103411597B
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Abstract
The present invention is a kind of interfere type closed-loop fiber optic gyroscope instrument based on circulation multi-turn effect, comprises light source, the first coupler, the second coupler, the 3rd coupler, Y waveguide, fiber optic loop and detector; The A of light source and the first coupler1End is fused to fusing point O with 0 °1, the B of the first coupler1The input of port and Y waveguide is fused to fusing point O with 0 °2, two outputs of Y waveguide respectively with the B of the second coupler2The B of end and the 3rd coupler3End is fused to fusing point O with 0 °3、O4, the A of the second coupler2The A of end and the 3rd coupler3End is fused to fusing point O with the two ends of polarization-maintaining fiber coil with 0 ° respectively5、O6, the C of the second coupler2The C of end and the 3rd coupler3End is fused to fusing point O with 90 °7, the D of the first coupler1End is fused to fusing point O with detector with 0 °8. The present invention has realized the circulation multi-turn effect of gyro, doubles turn signal, has reduced fiber optic loop length, can reach degree of precision requirement.
Description
Technical field
The present invention relates to a kind of reducing under the condition of fiber optic loop length, realize the interfere type closed-loop fiber optic gyroscope of circulation multi-turn effectInstrument, belongs to fiber-optics gyroscope field.
Background technology
Optical fibre gyro is as development a kind of novel inertia angular-rate sensor very rapidly, with its distinctive technology and performance advantage,As structure of whole solid state, reliability is high, the life-span is long; Toggle speed is fast, and the response time is short; Measurement category is large, wide dynamic range;Shock resistance, vibration, resistance to chemical attack; Volume is little, lightweight, cost is low; Be applicable to producing in enormous quantities etc., be widely used inEach field.
General optical fibre gyro form is single interfere type in the world, utilize a set of light path (polarization-maintaining fiber coil) fast axle orPerson's slow axis is realized SAGNAC interferometer, by main according to two bundles that (CW), counterclockwise (CCW) propagate clockwise respectivelyInterference between the wave train is resolved carrier and is rotated the SAGNAC phase shift causing. Although this interferometer is simple in structure, along withThe continuous expansion of optical fibre gyro application, its optical fiber sensing ring length of growing can cause larger parasitic phase noise, simultaneouslyEasily be subject to the impact of ambient temperature and introduce nonreciprocal error, restricted raising and the development of optical fibre gyro precision.
Summary of the invention
To the object of the invention is in order addressing the above problem, to propose a kind of reducing under the condition of fiber optic loop length, realize circulation manyThe interfere type closed-loop fiber optic gyroscope instrument of circle effect and closed-loop control.
A kind of interfere type closed-loop fiber optic gyroscope instrument based on circulation multi-turn effect provided by the invention, comprise light source, the first coupler,The second coupler, the 3rd coupler, Y waveguide, fiber optic loop and detector;
The A of light source and the first coupler1End is fused to fusing point O with 0 °1, the B of the first coupler1The input of port and Y waveguideBe fused to fusing point O with 0 °2, two outputs of Y waveguide respectively with the B of the second coupler2The B of end and the 3rd coupler3End with0 ° is fused to fusing point O3And O4, the A of the second coupler2The A of end and the 3rd coupler3End respectively with the two ends of polarization-maintaining fiber coil with0 ° is fused to fusing point O5And O6, the C of the second coupler2The C of end and the 3rd coupler3End is fused to fusing point O with 90 °7, firstThe D of coupler1End is fused to fusing point O with detector with 0 °8。
Light source is wide spectrum light source, and wide spectrum light source output light enters Y waveguide through the first coupler and rises partially, two outputs of Y waveguideLight wave enter fiber optic loop along the second coupler and the 3rd coupler respectively, two restraint light wave in opposite directions detours in fiber optic loop; Detour strangeA few two are restrainted a part for light wave in opposite directions and are converged generation interference signal by Y waveguide, and interference signal arrives and visits through the first couplerSurvey device, two remainders of restrainting light wave are in opposite directions through fusion point O7, enter with Y waveguide and play folk prescription to orthogonal optical axis transmission, more eachFrom getting back to the second coupler and the 3rd coupler, continue to detour in fiber optic loop.
Advantage of the present invention and good effect are:
(1) realize the circulation multi-turn effect of gyro, doubled turn signal;
(2) adopted the very weak wide spectrum light source of coherence, the various stray waves of having avoided laser light source strength coherence to cause are dryThe very noisy relating to and bring;
(3) under the prerequisite that ensures precision, reduced fiber optic loop length, can effectively suppress external environment and change the nonreciprocal mistake causingPoor;
(4) there is ripe technical foundation, can reach higher required precision;
(5) closed loop that has realized gyro is modulated.
Brief description of the drawings
Fig. 1 is interfere type closed-loop fiber optic gyroscope instrument structured flowchart of the present invention;
Fig. 2 is wide spectrum light source coherent function;
Fig. 3 is the bias modulation waveform applying on Y waveguide;
Fig. 4 is the feedback modulation waveform for realizing closed loop;
In figure:
1-light source 2-first coupler 3-Y waveguide 4-the second coupler
5-the 3rd coupler 6-fiber optic loop 7-detector
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail.
The present invention is a kind of interfere type closed-loop fiber optic gyroscope instrument based on circulation multi-turn effect, as shown in Figure 1, comprise light source 1,The first coupler 2, Y waveguide 3, the second coupler 4, the 3rd coupler 5, fiber optic loop 6 and detector 7.
The A of light source 1 and the first coupler 21End is fused to fusing point O with 0 °1, the B of the first coupler 21Port and Y waveguide 3Input be fused to fusing point O with 0 °2, two outputs of Y waveguide 3 respectively with the B of the second coupler 42End and the 3rd couplingClose the B of device 53End is fused to fusing point O with 0 °3And O4, the A of the second coupler 42The A of end and the 3rd coupler 53End respectivelyBe fused to fusing point O with the two ends of polarization-maintaining fiber coil 6 with 0 °5And O6, the C of the second coupler 42End and the 3rd coupler 5C3End is fused to fusing point O with 90 °7, the D of the first coupler 21End is fused to fusing point O with detector 7 with 0 °8。
In embodiments of the present invention, light source 1 is selected the wide range SLD light source with high-polarization, and model is SLD13; The first couplingClose device 2 and select the PMC-X-2*2-1550-50/50-0-4X type polarization-maintaining coupler of Shenzhen Lang Guang company; Y waveguide 3 is selected generation dimensionThe PMD1559-BLK type multi-functional integrated optical modulator of logical company; The second coupler 4 and the 3rd coupler 5 are selected ShenzhenThe PMFC-55-1-10-B-NNN-BBB-P-1 type polarization-maintaining coupler of Lang Guang company; Fiber optic loop 6 is selected polarization-maintaining fiber coil; SurveyDevice 7 is selected the PFTM901-001 type photodetector of Wuhan Telecommunication Devices Co., Ltd.
Wide spectrum light source output light rises to the rear by coupler light splitting through Y waveguide, light wave can be circulated with relatively high power in light pathMulti-turn; By 90 ° between two light splitting couplers to axle welding control output signal and carry out feedback closed loop modulation, thereby a set ofIn equipment, realize circulation multi-turn light path, the turn signal that utilizes the multi-turn effect of gyro to obtain doubling.
Specific works process is: light source 1 is exported light and after the first coupler 2, entered 3 of Y waveguides partially, two of Y waveguide 3The light wave of output enters the second coupler 4 and the 3rd coupler 5 along polarization maintaining optical fibre respectively, separately along polarization-maintaining fiber coil 6 phasesTo propagation, after detouring one week, light wave enters the 3rd coupler 5 clockwise, and light wave enters the second coupler 4 counterclockwise. ConsiderTwo couplers 4 and the 3rd coupler 5 have been selected the polarization-maintaining coupler with special splitting ratio 10/90, and two restraint light wave in opposite directions will be eachOwn 10% converges to same polarization maintaining optical fibre via Y waveguide 3, after the first coupler 2, exports interference signal by detector 7;Residue 90% is by 90 ° of fusion point O through between the second coupler 4 and the 3rd coupler 57, enter with 3 of Y waveguides inclined to one sideThe optical axis transmission that direction is orthogonal, then get back to separately the second coupler 4 and the 3rd coupler 5, continue to detour in fiber optic loop 6.Consider the high polarization characteristic of Y waveguide, the light of the even number circle that detours in fiber optic loop 6 because with 3 folk prescriptions of Y waveguide to orthogonal andCan not get back to detector 7 by Y waveguide 3, only have again and could pass through Y waveguide after 90 ° of fusion points change axle transmission. CauseThis, the light wave of the odd number circle that only detours in fiber optic loop in this programme could pass through Y waveguide 3, after the first coupler 2, arrivesDetector 7. The demodulation value that the signal of being surveyed by detector 7 is exported after digital circuit demodulation, the SAGNAC that rotation causesPhase shift size, will feed back to Y waveguide 3.
The output signal of final gyro is the stack of odd number circle optical interference signal, and the turn signal that can obtain doubling is being protectedUnder the prerequisite of card precision, reduce fiber optic loop length, can effectively suppress external environment and change the nonreciprocal error causing; Can adopt simultaneouslyBy modulation /demodulation and the feedback of the technical method settling signal similar to traditional gyro, thereby realize the closed loop modulation of gyro, reachHigher required precision.
The coherent function of wide spectrum light source 1 as shown in Figure 2. In figure, abscissa represents optical path difference, and unit is μ m, and ordinate represents to returnOne changes degree of coherence. From figure, curve can be found out, along with the increase of optical path difference, normalization degree of coherence reduces gradually.
The modulation signal applying on Y waveguide 3 is the stack of offset signal and feedback signal, and its waveform is respectively as Fig. 3 and Fig. 4 instituteShow.
In the present invention, adopt Φm(t)=± square-wave signal of (pi/2) is as bias modulation signal, as shown in Figure 3. The modulation of square wave frequentlyRate is the eigenfrequency f of fiber optic loop0=1/ (2 τ), wherein τ is that light is by the transmission time of fiber optic loop. Can produce thus oneThe bias modulation of ΔΦ (t)=± π, i.e. optical fibre gyro alternation, on ± π point, now has maximum detection sensitivity.
The closed signal processing method that the present invention adopts is the digital closed loop scheme of staircase waveform feedback, as shown in Figure 4. Staircase waveformShoulder height ΦsDetermined by demodulation value, i.e. shoulder height ΦsThe SAGNAC phase shift equal and opposite in direction causing with rotation, and stepDuration equals the transmission time τ of fiber optic loop.
Step signal and square wave offset signal are carried out to synchronous digital stack after-applied to realizing this gyro on Y waveguide 3Complete-digital closed-loop.
Claims (1)
1. the interfere type closed-loop fiber optic gyroscope instrument based on circulation multi-turn effect, is characterized in that, comprising: light source, the first couplingClose device, the second coupler, the 3rd coupler, Y waveguide, fiber optic loop and detector; Light source is wide spectrum light source; Light source and firstThe A of coupler1End is fused to fusing point O with 0 °1, the B of the first coupler1The input of port and Y waveguide is fused to molten with 0 °Point O2, two outputs of Y waveguide respectively with the B of the second coupler2The B of end and the 3rd coupler3End is fused to fusing point with 0 °O3And O4, the A of the second coupler2The A of end and the 3rd coupler3End is fused to fusing point with the two ends of polarization-maintaining fiber coil with 0 ° respectivelyO5And O6, the C of the second coupler2The C of end and the 3rd coupler3End is fused to fusing point O with 90 °7, the D of the first coupler1End is fused to fusing point O with detector with 0 °8；
Wide spectrum light source output light enters Y waveguide through the first coupler and rises partially, and the light wave of two outputs of Y waveguide is respectively along secondCoupler and the 3rd coupler enter fiber optic loop, and two restraint light wave in opposite directions detours in fiber optic loop; After detouring one week, light wave enters clockwiseEnter the 3rd coupler, light wave enters the second coupler counterclockwise; The second described coupler and the 3rd coupler are selected has light splittingThan 10/90 polarization-maintaining coupler, two restraint light wave in opposite directions converges to same polarization maintaining optical fibre via Y waveguide, warp by each own 10%After the first coupler, export interference signal by detector; Two remainders of restrainting light wave are in opposite directions through fusion point O7, enter and Y waveguidePlay folk prescription to orthogonal optical axis transmission, then get back to separately the second coupler and the 3rd coupler, continue to detour in fiber optic loop; ExamineConsider to the high polarization characteristic of Y waveguide, the light of the even number circle that detours in fiber optic loop is because play folk prescription to orthogonal and can not lead to Y waveguideCross Y waveguide and get back to detector, only have again and could pass through Y waveguide after 90 ° of fusion points change axle transmission; Therefore, detourTwo of odd number circle is restrainted a part for light wave in opposite directions and is converged generation interference signal by Y waveguide, and interference signal arrives through the first couplerDetector; The demodulation value that the signal of being surveyed by detector is exported after digital circuit demodulation, the SAGNAC phase shift that rotation causesSize, will feed back to Y waveguide;
The output signal of final gyro is the stack of odd number circle optical interference signal, and the turn signal that can obtain doubling is being protectedUnder the prerequisite of card precision, reduce fiber optic loop length, can effectively suppress external environment and change the nonreciprocal error causing.
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| CN103940415A (en) * | 2014-03-26 | 2014-07-23 | 同济大学 | Polarization-maintaining fiber sensing loop structure of fiber optic gyroscope |
| CN104197925B (en) * | 2014-09-16 | 2017-01-18 | 北京航空航天大学 | Photonic bandgap fiber gyroscope based on phase optimization and inhibition method for fiber core refractive index mismatch induced offset errors thereof |
| CN104374410B (en) * | 2014-11-28 | 2017-08-08 | 北京航空航天大学 | The measurement apparatus and method of fiber optic loop welding point reflection in a kind of photon band-gap optical fiber gyro |
| CN105806329B (en) * | 2016-03-16 | 2018-11-02 | 北京航天时代光电科技有限公司 | Integrated optical modulator and fiber-optic gyroscope light path for the optical fibre gyro interferometer light path that doubles |
| CN107101805B (en) * | 2017-04-21 | 2019-03-12 | 北京航空航天大学 | Hollow polarization-maintaining photonic crystal fiber Verdet constant measuring apparatus and method |
| CN110426027B (en) * | 2019-08-09 | 2021-04-20 | 浙江大学 | Optical fiber gyroscope for realizing multi-turn winding based on magneto-optical switch and method thereof |
| CN111089578B (en) * | 2020-01-21 | 2022-09-16 | 燕山大学 | Interference type optical fiber gyroscope |
| CN111947641B (en) * | 2020-08-06 | 2022-09-20 | 大连理工大学 | White light interference optical fiber gyroscope based on rhombic optical path difference offset structure |
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