CN208333488U - Open-loop fiber optic gyroscope - Google Patents
Open-loop fiber optic gyroscope Download PDFInfo
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- CN208333488U CN208333488U CN201820958740.XU CN201820958740U CN208333488U CN 208333488 U CN208333488 U CN 208333488U CN 201820958740 U CN201820958740 U CN 201820958740U CN 208333488 U CN208333488 U CN 208333488U
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- 239000013307 optical fiber Substances 0.000 claims abstract description 142
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- 230000008033 biological extinction Effects 0.000 claims abstract description 11
- 230000008878 coupling Effects 0.000 claims description 6
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- 238000005859 coupling reaction Methods 0.000 claims description 6
- 239000013078 crystal Substances 0.000 claims description 4
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- 230000003287 optical effect Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
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- 238000011160 research Methods 0.000 description 3
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- 238000004891 communication Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
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- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000003504 photosensitizing agent Substances 0.000 description 1
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- 239000007787 solid Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
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Abstract
The utility model relates to an optical fiber sensing technology field, concretely relates to ring-opening fiber optic gyroscope has solved in the fiber optic gyroscope scheme because of the ring-opening fiber optic gyroscope reliability hidden danger that adopts traditional polarizer to bring, difficult to realize the great scheduling problem of less volume and consumption. The optical fiber ring phase modulator comprises a light source, a detector, a coupler, an optical fiber ring and a phase modulator; the light source is an SLD light source or an ASE light source; the light source and the detector are respectively connected with the coupler; it is characterized in that: the optical fiber ring comprises a coupler, a 45-degree inclined fiber grating polarizer and a fiber ring, wherein the two 45-degree inclined fiber grating polarizers have the same extinction ratio and the same polarization direction; one end of the other 45-degree inclined fiber grating polarizer is connected with the coupler, and the other end of the other 45-degree inclined fiber grating polarizer is connected with the other end of the fiber ring.
Description
Technical field
The utility model relates to technical field of optical fiber sensing, and in particular to a kind of open-loop optical fiber gyro.
Background technique
Optical fibre gyro is a kind of sensor for detecting carrier movement angular speed, is the Primary Component in navigation instrument,
Its product has been widely used in the wide range of areas such as aeronautics and space, navigation and deep-sea detecting, railway, communication.Wherein, open loop light
Fine gyro has performance small in size, light-weight, structure is simple and relatively excellent, has in middle low-precision optical fiber gyro field
Broad mass market potentiality.
With the continuous expansion of scientific research and engineer application, the environment of open-loop optical fiber gyro work becomes increasingly complex, divided ring
Stability, volume, weight and the power consumption of optical fibre gyro also have higher requirement.
Classical open loop policy optical path production is complicated, and processing technology is complicated, and equipment cost is high, and schematic diagram is as shown in Figure 1.Side
The polarizer used in case draws cone and crystal growth for online optical fiber, it is this be polarized scheme demand the device is complicated, technology difficulty is big,
Yield rate is low, and wimble structure is drawn also to determine that its impact resistance is poor, there are reliability hidden danger.
In addition, there are also some schemes being polarized using Y waveguide, but still have following defects that
(1) Y waveguide is block structure, is unfavorable for realizing smallerization of optical fibre gyro.
(2) due to the non-all optical fibre structure of Y waveguide, need Space Coupling to optical fiber output in optical fibre gyro system, sky at this
Between separation coupling part need to pass through special fixation and encapsulation, exist because environment high vibration cause coupling efficiency reduce even lose
The risk of effect.In addition, to obtain smaller gyro volume, or even Y waveguide encapsulation can be removed, it is steady to further reduced optical fibre gyro
It is qualitative.
It (3), generally can only be by the same super-radiance light emitting diode of Y waveguide (SLD) light in certain open-loop optical fiber gyro schemes
Source, circuit board are fixed on the two sides of fiber optic loop, to introduce an optical fiber longitudinally through gyro.To protect the optical fiber, fiber optic loop
It need to be designed by special machine, additionally casing protection is added to the longitudinal optical fiber of this section.This improves the complexity of manufacture craft
Property, and in the environment of high-frequency vibration, high vibration, which still remains the risk of damage, and then leads to the system failure.
(4) Insertion Loss of Y waveguide is larger, therefore is had based on power of the open-loop optical fiber gyro of Y waveguide for light source higher
Requirement, while make open-loop optical fiber gyro power consumption increase, be unfavorable for the application of optical fibre gyro.
Utility model content
The purpose of this utility model is that solve in traditional scheme in view of the above-mentioned problems, providing a kind of open-loop optical fiber gyro
Because drawing cone and crystal growth or Y waveguide as polarizer bring open-loop optical fiber gyro reliability hidden danger using optical fiber, being difficult to reality
The problems such as existing smaller volume and larger power consumption.Can be effectively improved while guaranteeing open-loop optical fiber gyro precision its stability,
Reliability can effectively improve the multinomial performance of open-loop optical fiber gyro, realize smallerization of open-loop optical fiber gyro, lighter amount,
More low-power consumption, more inexpensive, more constructional simple design and technique are open-loop optical fiber gyro performance boost, application, expansion and market
It is universal to have established important foundation.
The utility model design of the utility model is: SLD (super-radiance light emitting diode) light source or ASE (Amplified Spontaneous spoke
Penetrate) light that issues of light source is divided into the two-beam of isocandela after coupler and enters fiber optic loop, passing through two fiber optic loop tails respectively
Become the two-beam of the polarization states such as isocandela after 45 ° of inclined optical fiber grating polarizers on fibre, this two-beam divides in fiber optic loop
It is not propagated along opposite clockwise and counterclockwise, and two-beam meets coherent condition.When fiber optic loop occurs to turn around central shaft
After dynamic, Sagnac effect is produced, so that the interference light intensity at coupler changes；It detects to change by photodetector
Light intensity, just obtain rotational angular velocity after processing.
Technical solution provided by the utility model is: a kind of open-loop optical fiber gyro, including light source, detector, coupler, light
Fine ring and phase-modulator；The light source is SLD light source or ASE light source；Light source and detector are connect with coupler respectively；It is special
Different place is: it further include two extinction ratios are identical and the consistent 45 ° of inclined optical fiber grating polarizers in polarization direction, one of them
One end of 45 ° of inclined optical fiber grating polarizers is connected with coupler, and the other end is connected with one end of fiber optic loop；Another one
One end of 45 ° of inclined optical fiber grating polarizers is connected with coupler, and the other end is connected with the other end of fiber optic loop.
Further, two tail optical fibers of the coupler are connected with two tail optical fibers of fiber optic loop respectively；The fiber optic loop
Tail optical fiber is polarization maintaining optical fibre, inscribes 45 ° of inclined optical fiber gratings respectively on two tail optical fibers of fiber optic loop, forms described two 45 ° and inclines
The oblique fiber grating polarizer；Alternatively, tail optical fiber is polarization maintaining optical fibre when coupler uses polarization-maintaining coupler；It is connected in coupler
45 ° of inclined optical fiber gratings are inscribed on two tail optical fibers of fiber optic loop respectively, form described two 45 ° of inclined optical fiber grating polarizers.
Further, the operating central wavelength of above-mentioned 45 ° of inclined optical fiber gratings is 850nm or 1310nm or 1550nm,
Operation wavelength bandwidth is 100nm~200nm, is polarized direction along polarization maintaining optical fibre fast axle or slow-axis direction, and extinction ratio is 20dB
~50dB.
Further, above-mentioned phase-modulator is piezoelectric ceramic phase；Piezoelectric ceramics phase is added in the optical path
Modulator further improves the sensitivity of detection system, and after ovennodulation, demodulation, which has obtained high sensitivity and same
When can distinguish again positive and negative rotation linearisation output.
Further, above-mentioned light source is using coaxial packaging light source or butterfly-type packaged light source or straight cutting packaged light source.According to reality
Border needs choosing multiple form packaged light source, and the parameters such as light intensity, structure can be made to be easier to adjust, and high reliablity is batch
It is good.
Further, above-mentioned coupler is using drawing cone coupler or crystal light splitting coupler.
Further, above-mentioned detector uses coaxial packaging, and its reliability is high, electromagnetism interference, good product consistency.
Further, the polarization maintaining optical fibre that above-mentioned polarization maintaining optical fibre is 125 μm in addition to traditional covering can be used, also can be used covering
For 80 μm or 60 μm of polarization maintaining optical fibre, polarization crosstalk is small, and at low cost, corollary equipment is complete.
Currently, 45 ° of inclined optical fiber gratings of open report are mainly used in optical fiber laser, optical fibre device and imaging side
Face.
Initially, Britain Aston university, which reports, realizes 1.5 mu m waveband mode-locked fiber lasers using 45 ° of inclined optical fiber gratings
Device (Optics Express, Vol.18, No.18,18906,2010)；
It is inclined that Xian Inst. of Optics and Precision Mechanics, Chinese Academy of Sciences using 45 ° of inclined optical fiber gratings realizes 1 mu m waveband list
It shakes mode locked fiber laser (Optics Express, Vol.20, No.17,19000,2012)；
Aston university of Britain devises complete optical fiber polarization interference filter (Optics using 45 ° of inclined optical fiber gratings
Letters, Vol.37, No.3,353,2012), and the filtering to laser output orphan's sideband is realized with the filter
(Optics Letters,Vol.37,No.21,4522,2012)。
Nearly 2 years articles report also still concentrates on the application of optical fiber laser, such as: utilize 45 ° of inclined optical fiber gratings
1.5 μm of narrow linewidth mode-locked lasers (Optics Express, Vol.25, No.14,16708,2017) are made, nanosecond tune Q swashs
Light device (Applied Optics, Vol.56, No.12,3583,2017) and some other type optical fiber laser (Optics
Communications,Vol.406,151,2017；25th International Conference on Optical
Fiber Sensors(OFS),SPIE,10323,2017)。
In addition, 2016,45 ° of inclined optical fiber gratings be applied in imaging system (Optics Letters, Vol.41,
No.11,2398,2016)。
Due to the main research of 45 ° of inclined optical fiber gratings, the Aston university that production unit is Britain, the country has the device
Part production ability is more limited to the only a fews list such as Xian Inst. of Optics and Precision Mechanics, Chinese Academy of Sciences, Central China University of Science and Technology
Position, has no 45 ° of inclined optical fiber grating products with High Extinction Ratio in the market, and independent research, production have 45 ° of High Extinction Ratio
Inclined optical fiber grating technical difficulty is big, threshold is high；More importantly the operation wavelength of 45 ° of inclined optical fiber gratings is mainly 1 μm
And 1.5 mu m wavebands, what operation wavelength lacked 850nm, 1310nm wave band limits its application in optical fibre gyro, the public
The characteristics of for 45 ° of inclined optical fiber grating polarizers and production method understanding are limited, do not find that it is answered in open-loop optical fiber gyro
Potentiality.
45 ° of inclined optical fiber grating polarizers are polarized principle are as follows: by ultraviolet light production fiber grating refraction index changing very
It is small by (10-5~10-3Magnitude), different refractivity ratio is almost 1, and being computed its Brewster's angle is 45 °.Therefore, when optical fiber light
When grid tilt angle is 45 °, according to Brewster's law, a branch of non-polarized light passes through 45 ° of inclined optical fiber gratings, s polarization state
Light is reflected, and the light of p-polarization state continues to transmit, and is polarized effect to generate.
Compared with prior art, the utility model has the advantage that
1, the stability and reliability of open-loop optical fiber gyro are improved.It is identical using two extinction ratios, polarization direction is consistent
Two 45 ° of inclined optical fiber grating polarizers open-loop optical fiber gyro be not present space optical coupling, realize all -fiber of system
Structure, stability, reliability are greatly improved, and can cope with application environment more acutely, complicated.
2, smallerization of open-loop optical fiber gyro is realized.45 ° of inclined optical fiber grating polarizers have all optical fibre structure, volume
It is small, flexible, it is suitble to the optical path assembling of miniaturization open-loop optical fiber gyro and integrated, compared to using the independent blocky polarizer and the
The traditional scheme of two couplers can greatly reduce the volume of open-loop optical fiber gyro.In addition, by fiber optic loop or coupler
Two same parameters, 45 ° of inclined optical fiber grating polarizers are directly inscribed on tail optical fiber fibre core, can reduce by a coupler for system, into one
Step reduces gyro size.
3, the simpler structure design of open-loop optical fiber gyro and technique are realized.Using tool, there are two 45 ° of inclined optical fiber gratings
The fiber optic loop or coupler of polarizer tail optical fiber, do not need to exclusively carry out and are polarized device space structure design and solid in optical fibre gyro
It is fixed, it is not necessarily to special package.In addition, because reducing a coupler, technique and production process are simpler.
4, open-loop optical fiber gyro more low-power consumption is realized.Generally there are the intrinsic Insertion Loss of 3dB and 2 for the Y waveguide that the prior art uses
~4dB coupling loss, and 45 ° of inclined optical fiber grating polarizers are due to its all optical fibre structure, almost there is only the intrinsic Insertion Loss of 3dB,
Therefore open-loop optical fiber gyro power consumption performance can promote about 1 times.
5, the more inexpensive of open-loop optical fiber gyro is realized.The production and encapsulation of Y waveguide are relative complex, expensive；And 45 °
The price of inclined optical fiber grating can save a large amount of cost for a large amount of open-loop optical fiber gyro market demand lower than Y waveguide.
And due to using two 45 ° of inclined optical fiber grating polarizers, reduces a coupler for system, further reduced system
Cost.
Detailed description of the invention
Fig. 1 is traditional fiber gyro scenario-frame schematic diagram；
Fig. 2 is the utility model open-loop optical fiber gyro one embodiment light path part structure principle chart；
Fig. 3 is the structural schematic diagram of 45 ° of inclined optical fiber grating polarizer one embodiment of the utility model.
Each label is described as follows in figure:
1-light source, 2-detectors, 3-couplers, 4-fiber optic loops, 5-phase-modulators, 6-45 ° of inclination optical fiber light
The grid polarizer.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.
A kind of open-loop optical fiber gyro as shown in Figure 2, including light source 1, detector 2, coupler 3, fiber optic loop 4, phase tune
Device 5 processed and two 45 ° of inclined optical fiber grating polarizers 6 (referring to Fig. 3)；Light source 1 uses SLD light source, and phase-modulator 5 is using pressure
Electroceramics phase-modulator, coupler 3 is using drawing cone coupler.
Light source 1 is driven by a light source driving circuit.Light source 1 and detector 2 are located at the same side of coupler 3, and respectively with
Coupler 3 connects, referring to fig. 2.Two tail optical fibers of coupler 3 are connected with two tail optical fibers of fiber optic loop 4 respectively.
The tail optical fiber of fiber optic loop is polarization maintaining optical fibre, inscribes 45 ° of inclined optical fiber gratings respectively on two tail optical fibers of fiber optic loop 4,
The central wavelength of 45 ° of inclined optical fiber gratings be 850nm or 1310nm or 1550nm, operation wavelength bandwidth be 100nm~
200nm is polarized direction along polarization maintaining optical fibre fast axle or slow-axis direction, and extinction ratio is 20dB~50dB, ultimately forms two 45 °
The extinction ratio of the inclined optical fiber grating polarizer 6, the two 45 ° of inclined optical fiber grating polarizers 6 is identical, and polarization direction is consistent
(polarizing along polarization maintaining optical fibre fast axle or slow-axis direction), forms the fiber optic loop with polarization response；The fiber optic loop does not need
Additional is polarized device, eliminates the independent polarizer, second coupler in traditional scheme, reduces two fusion points, more
It is promoted conducive to the miniaturization assembling of optical path and the stability of system.
The present embodiment uses 45 ° of inclined optical fiber gratings of 1.3 mu m wavebands, and manufacturing process is as follows:
Photosensitizer processing in 48 hours is carried out to 1.3 μm of polarization maintaining optical fibres first, then passes through amplification shaft system calibration polarization-maintaining
The speed of optical fiber is axial, by theoretical calculation select mask plate cycle parameter 1515nm, 33.7 degree of tilt angle parameter, utilization
The method of the ultraviolet optical scanning phase mask plate of 244nm makes 1.3 mu m waveband inclined optical fiber gratings along polarization maintaining optical fibre fast axle or slow axis.
After actual measurement, extinction ratio the > 20dB, spectral bandwidth > of 45 ° of 1.3 mu m waveband of production inclination polarization-maintaining fiber gratings
100nm。
Claims (8)
1. a kind of open-loop optical fiber gyro, including light source (1), detector (2), coupler (3), fiber optic loop (4) and phase-modulator
(5)；The light source (1) is SLD light source or ASE light source；Light source (1) and detector (2) are connect with coupler (3) respectively；
The consistent 45 ° of inclined optical fiber grating polarizers (6) in identical and polarization direction it is characterized by also including two extinction ratios,
One end of one of them 45 ° of inclined optical fiber grating polarizer (6) is connected with coupler (3), the other end and fiber optic loop (4)
One end is connected；
One end of 45 ° of inclined optical fiber grating polarizers (6) of another one is connected with coupler (3), the other end and fiber optic loop (4)
The other end be connected.
2. a kind of open-loop optical fiber gyro according to claim 1, it is characterised in that: two tail optical fibers of the coupler (3)
It is connected respectively with two tail optical fibers of fiber optic loop (4)；
The tail optical fiber of the fiber optic loop is polarization maintaining optical fibre, inscribes 45 ° of inclination optical fiber light respectively on two tail optical fibers of fiber optic loop (4)
Grid form described two 45 ° of inclined optical fiber grating polarizers (6)；
Alternatively, tail optical fiber is polarization maintaining optical fibre when coupler (3) use polarization-maintaining coupler；In coupler (3) connection fiber optic loop
45 ° of inclined optical fiber gratings are inscribed on two tail optical fibers respectively, form described two 45 ° of inclined optical fiber grating polarizers (6).
3. a kind of open-loop optical fiber gyro according to claim 2, it is characterised in that: the work of 45 ° of inclined optical fiber gratings
Making central wavelength is 850nm or 1310nm or 1550nm, and operation wavelength bandwidth is 100nm~200nm, is polarized direction along guarantor
Polarisation fibre fast axle or slow-axis direction, and extinction ratio is 20dB~50dB.
4. a kind of open-loop optical fiber gyro according to claim 2 or 3, it is characterised in that: the phase-modulator (5) is pressure
Electroceramics phase-modulator.
5. a kind of open-loop optical fiber gyro according to claim 4, it is characterised in that: the light source (1) uses coaxial packaging
Light source or butterfly-type packaged light source or straight cutting packaged light source.
6. a kind of open-loop optical fiber gyro according to claim 5, it is characterised in that: the coupler (3) is using drawing cone coupling
Clutch or crystal light splitting coupler or micro-optics coupler.
7. a kind of open-loop optical fiber gyro according to claim 6, it is characterised in that: the detector (2) uses same axle envelope
Dress.
8. a kind of open-loop optical fiber gyro according to claim 7, it is characterised in that: the polarization maintaining optical fibre uses covering for 60
μm or 80 μm or 125 μm of polarization maintaining optical fibre.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820958740.XU CN208333488U (en) | 2018-06-21 | 2018-06-21 | Open-loop fiber optic gyroscope |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108680151A (en) * | 2018-06-21 | 2018-10-19 | 中国科学院西安光学精密机械研究所 | Open-loop fiber optic gyroscope |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108680151A (en) * | 2018-06-21 | 2018-10-19 | 中国科学院西安光学精密机械研究所 | Open-loop fiber optic gyroscope |
| CN108680151B (en) * | 2018-06-21 | 2023-12-08 | 中国科学院西安光学精密机械研究所 | Open-loop fiber optic gyroscope |
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