CN104713542B - A kind of high-precision optical fiber gyro weldless preparation method - Google Patents
A kind of high-precision optical fiber gyro weldless preparation method Download PDFInfo
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- CN104713542B CN104713542B CN201310676683.8A CN201310676683A CN104713542B CN 104713542 B CN104713542 B CN 104713542B CN 201310676683 A CN201310676683 A CN 201310676683A CN 104713542 B CN104713542 B CN 104713542B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C25/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass
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Abstract
The present invention overcomes the loss and polarization error that the fused fiber splice in conventional fiber gyro manufacture craft brought, and optical fibre gyro can be made further to improve precision, reach required precision used in airborne fiber strapdown inertial navigation system.High-precision optical fiber gyro weldless preparation method of the present invention is comprising unique component preparatory technology technology, different from domestic existing optical fibre gyro assembling and integrated optical modulator coupling technique, the butt coupling that integrated optical modulator chip and fiber optic loop, coupler are realized to weldless is realized, the influence of fusion point is eliminated.Relatively current conventional fiber gyro preparation method greatly reduces the polarization interference and error produced by fiber-optic gyroscope light path, breaks through Gyro Precision limitation, further increases optical fiber gyroscope precision.
Description
Technical field
The invention belongs to fiber-optics gyroscope, it is related to a kind of high-precision optical fiber gyro weldless preparation method.
Background technology
Each inter-module of light path uses fused fiber splice in current internal optical fiber gyro light path principle, sees fusing point 1 in Fig. 1, fusing point 2
And fusing point 3 is optical fiber fusion welding point.But no matter how accurate fused fiber splice is, the presence of fusion point will necessarily introduce optical path loss
With polarization interference error, optical fiber gyroscope precision level is limited, the research and development process of high-precision optical fiber gyro is had influence on, and postpone
The application of airborne fiber strapdown inertial navigation system.In order to break through optical fibre gyro this precision limitation, reduce fiber-optic gyroscope light path loss and inclined
Error of shaking equal error is originated, it is necessary to eliminate fusion point.
The content of the invention
The purpose of the present invention：A kind of high-precision optical fiber gyro weldless preparation method is provided, fusion point is eliminated to gyro essence
The limitation of degree, improves Gyro Precision.
Technical scheme：A kind of high-precision optical fiber gyro weldless preparation method, is first respectively completed integrated optics
The polishing of modulator chip end face, coupler fiber end face and the tail optical fiber end face of optical fiber ring assemblies two, then fix respectively integrated
Three groups of fiber end faces for completing end face polishing are clamped to sextuple micro-positioning regulators platform, first coupled to first by optical modulator chip
Point carries out being imaged positioning calibration, and the one end for then choosing fiber optic loop tail optical fiber carries out being imaged positioning calibration as the second Coupling point, will
After the other end of fiber optic loop tail optical fiber at the beginning of the 3rd Coupling point as positioning, using tilter and gyroscopic effect to the 3rd Coupling point again
It is secondary to be calibrated, after the completion of debugging, put adhesive curing Coupling point.
Described high-precision optical fiber gyro weldless preparation method, it further comprises following steps：
Step 1：Carry out integrated optical modulator chip end face, coupler fiber end face, the throwing of the tail optical fiber end face of fiber optic loop two
Light processing；
Step 2：Integrated optical modulator chip is placed on fixed support fixture, the fiber coupling end of three Coupling points is consolidated
It is scheduled on sextuple micro-positioning regulators platform；
Step 3：Thang-kng alignment is carried out by feux rouges and infrared light, the alignment of first Coupling point is completed；
Step 4：Respectively initial alignment is carried out to second with the 3rd Coupling point；
Step 5：By applying sinusoidal and square-wave modulation signal on integrated optical modulator chip, and utilize gyroscopic effect
Signal shape carries out light path Optimization Debugging with amplitude, and completion is accurately aligned to the 3rd Coupling point；
Step 6：The joint debugging of high-precision optical fiber gyro is completed by the Performance Match of optical fibre gyro device；
Step 7：Dispensing is carried out to Coupling point to fix and carry out the making of integrated optical modulator lead and gyro coiling dress
With grade subsequent technique process.
In described high-precision optical fiber gyro weldless preparation method step 4, second is defined with the 3rd Coupling point
Afterwards, the initial alignment to the second Coupling point is completed using the mode in fiber optic loop other end detection luminous power and extinction ratio；Based on six
Micro-positioning regulators platform high stability is tieed up, the end positions of Coupling point are marked record scale, and recover in the process of rear end
The mark position.
In step 5, integrated optical modulator is modulated using signal generator, and based on optical fibre gyro effectiveness and six
Wei Weidongtiaojietai is accurately aligned, and pass through Sine Modulated and square wave to the Coupling point of each Coupling point, particularly the 3rd
Modulate further optimizing regulation Coupling point position.
In step 6, the online Performance Match test for carrying out optical fibre gyro device on sextuple micro-positioning regulators platform, by optical fiber top
The joint debugging of spiral shell performance is to optimal.
The technique effect of the present invention：High-precision optical fiber gyro weldless preparation method of the present invention is accurate comprising unique component
For technology, different from domestic existing optical fibre gyro mounting technology and integrated optical modulator coupling technique, realizing will
Integrated optical modulator chip realizes the butt coupling of weldless with fiber optic loop, coupler, eliminates the influence of fusion point.Relatively
Current conventional fiber gyro preparation method greatly reduces the polarization interference and error produced by fiber-optic gyroscope light path, breaks through gyro
Precision is limited, and further increases optical fiber gyroscope precision.
Brief description of the drawings
Fig. 1 is fiber-optic gyroscope light path figure.
Fig. 2 is the processing of polarization-maintaining coupler fiber end face, and polarization-maintaining coupler is exported using special polishing fixture and polishing platform
Coupled end carries out angle polishing and surface treatment, forms 15 ° of optical fiber polishing angles.
Fig. 3 is that integrated optical modulator chip end face is processed into 10 ° of polishing angles using special polishing fixture and polishing platform.
Fig. 4 is to be made the two ends tail optical fiber of fiber optic loop and polishing, and tail optical fiber angle is completed using special fixture and polishing platform
Polishing and surface treatment are spent, 15 ° of optical fiber polishing angles are formed.
Fig. 5 is first Coupling point（Chip inputs A1 ends and polarization-maintaining coupler C3 ends）Alignment, wherein integrated optics are modulated
Three ports of device chip are individually identified as A1 ends, A2 ends, A3 ends, its chips input mark A1 ends, chip output mark
A2 ends, A3 ends；Two optic fibre ends of fiber optic loop are individually identified as B1 ends, B2 ends；4 port definitions of coupler be C1 ends, C2 ends,
C3 ends, C4 ends.
Fig. 6 is second Coupling point（Chip exports A3 ends and fiber optic loop B2 ends）It is directed at schematic diagram.
Fig. 7 is the 3rd Coupling point（Chip exports A2 ends and fiber optic loop B1 ends）Initial alignment schematic diagram.
Being aligned of the 3rd Coupling point of Fig. 8, the fine setting of full light path, optimization and gyro joint debugging schematic diagram.
In figure：1- light sources, 2- polarization-maintaining couplers, 3- fusing points Isosorbide-5-Nitrae-integrated optical modulator chip, 5- fusing points 2,6- optical fiber
Ring, 7- fusing points 3,8- detectors, 9- protection suspensions, 10- coupler tail optical fiber end face polishings end, the special polishing fixtures of 11-, 12- is ground
Throwing machine and polishing disk, 13- chip polishing fixtures, 14- fiber optic loop tail optical fiber polishing fixtures, 15- workbench, 16- optical tables, 17-
Chip stationary fixture, 18- screen boards and hot spot schematic diagram, 19- modulated signal delivery spring pressings, 20- signal generators, 21-
Oscillograph, the infrared light power meters of 22-, 23- infrared probes, 24- tilters, 25- 6 DOF micro-positioning regulators platforms.
Embodiment
Below by drawings and examples, the present invention is described further：
High-precision optical fiber gyro weldless preparation method of the present invention is respectively completed first at polarization-maintaining coupler fiber end face
Reason, integrated optical modulator chip end face processing, fiber optic loop tail optical fiber handle three part preparatory process, then dispose fixed modulation device core
Piece, and sequence alignment, positioning and the calibration of 3 Coupling points are carried out, completing light path must connect and optimization process, and carry out modulator
At the beginning of chip input light debugging with light path Optimization Debugging, carry out gyro light path the device matching optimization of joint debugging, after the completion of progress
Point adhesive curing and completion contact conductor.
Refer to Fig. 2,3,4, the specific implementation of high-precision optical fiber gyro weldless preparation method of the present invention is given below
Journey, its step is as follows：
Step 1：Carry out Coupling point two terminal device coupler, the processing of fiber optic loop tail optical fiber end face.
In Fig. 2, polarization-maintaining coupler fiber end face processing when by the output end of coupler be embedded in by lithium niobate block, silico briquette or
In the geosynclinal blocks such as the V-groove or U-type groove of the processing of the materials such as titanium dioxide silico briquette, optic fibre end is clamped using respective special fixture
Carry out end face polishing, it is ensured that the surface quality of fiber end face and polishing angle.
In Fig. 3, integrated optical modulator chip is clamped in special end face polishing fixture, polishing platform and polishing disk is used
Angle polishing is determined in progress, according to certain technological procedure, it is ensured that the surface quality of chip end face and polishing angle.
By two output ends of fiber optic loop in Fig. 4, it is embedded in respectively by materials such as lithium niobate block, silico briquette or titanium dioxide silico briquettes
In the geosynclinal blocks such as the V-groove or U-type groove of processing, in order to polishing, and clamping and end face polishing are carried out using special fixture, protected
Demonstrate,prove the surface quality and polishing angle of fiber end face.
Step 2：The fixation of device and clamping（Referring to Fig. 5）
Integrated optical modulator chip is fixed on stent holder, the output of the polarization-maintaining coupler of polishing will be completed
Optical fiber end is controlled by a sextuple micro-positioning regulators platform clamping, and the tail optical fiber end of fiber optic loop two for completing polishing is gripped respectively
On sextuple micro-positioning regulators platform, and the two ends for the integrated optical modulator chip that is placed in.So that each termination polishing oblique angle plane and
Modulator chip inclined-plane is parallel, and the datum clamp face of fiber optic loop is fixed on tilter.
Step 3：The alignment of first Coupling point
Preliminary alignment
Optical fiber head C1 is transferred with adapter into red-light source, in integrated optical modulator chip right-hand member A2, A3 output end
A projection screen is placed at mouthful（Referring to Fig. 5）, micro-positioning regulators platform is adjusted, until observing two hot spots on screen board, border is clear
Clear, brightness is identical；
Accurate alignment
Infrared CCD connection monitoring device is placed on integrated optical modulator chip outgoing position, by infrared CCD sensitive wave length
It is adjusted at light source center wavelength, finely tunes input micro-positioning regulators platform, make two hot spot sharpness of border on monitor, brightness is equal
Deng.
Step 4：Second with the initial alignment of the 3rd Coupling point
Two optic fibre ends B1, B2 of fiber optic loop and integrated optical modulator chip output A2, A3 are subjected to collimation pair
Standard, is also the difficult point in whole invention, and other method can not complete the step, see Fig. 6, Fig. 7.
The selection explanation of second Coupling point：When carrying out the selection of the second Coupling point, because fiber optic loop has reciprocity special
Point, thus can an optional tail optical fiber be defined as the tail optical fiber of second Coupling point, labeled as B1;Corresponding chip output is defined as
The die terminals of second Coupling point, labeled as A2.Then last remaining fiber optic loop tail optical fiber is the tail optical fiber part of the 3rd Coupling point,
Labeled as B2, corresponding chip output is the chip output for being defined as the 3rd Coupling point, labeled as A3.
B1 optic fibre ends are aligned to the probe of infrared light power meter, the B2 optic fibre ends of fiber optic loop are installed in sextuple fine motion
On regulating platform, the sextuple micro-positioning regulators platform of its clamping is adjusted until the luminous power and extinction ratio maximum that are detected, in detail record B2 ends
6 scale values of the sextuple micro-positioning regulators platform at place（Displacement scale X, Y, Z and anglec of rotation θ1、θ2、θ3）, complete B2's and A3
Coupling position is determined, sees Fig. 6.
Side by the fine motion instrument of clamping B2 optic fibre ends along thang-kng optical axis is moved out, and exchange B1 is exported with B2 optic fibre ends
End, repeats process above process, and completion B1 is primarily determined that with A2 coupling position to be aligned, and sees Fig. 7.
Step 5：Light path Optimization Debugging
Infrared light power meter probe is removed, by the micro-positioning regulators instrument playback for clamping B2 optic fibre ends to the position of record, is used
Signal generator produces 40KHz~60KHz sinusoidal waveform, and waveform frequency avoids fiber optic loop eigenfrequency and its integral multiple, electricity
Pressure amplitude value is selected in about Vπ/ 2, on the electrode that sinusoidal signal is loaded into integrated optical modulator chip by wire and spring probe
（See Fig. 8）, pass through the waveform signal detected by oscillograph output detector, the fiber optic loop tail of fine setting the 3rd Coupling point of clamping
The sextuple micro-positioning regulators platform at fine B1 ends, until there is sinusoidal waveform and peak-to-peak value reaches maximum.
Change signal generator waveform, signal generator is selected to the square-wave frequency modulation of fiber optic loop eigenfrequency, square-wave voltage
Amplitude selects Vπ/2.Speed tilter is opened, gyro is in and waves rotary work state, observation oscilloscope output waveform, spirit
The indexs such as sensitivity, symmetry；The positive negative signal being added on modulator chip is exchanged, it is observation oscilloscope output shape, sensitivity, right
Whether title degree etc. is normal.
Step 6：Gyro joint debugging
After the completion of optical path adjusting, signal generator and oscillograph are removed, gyro light source, detection are driven using gyro circuit board
Device, modulator, according to the eigenfrequency and half-wave voltage preinstalled circuit parameter tested above, are exported by detecting gyro signal
Sensitivity, scale factor linearity, symmetry etc., on-line debugging light path and circuit are carried out to optical fibre gyro so that gyro is exported
Reach optimum efficiency.
Step 7：Dispensing is fixed
When gyro is adjusted optimally, put respectively between integrated optical modulator chip and three optical fiber ends a little
Uv-curable glue, uses uviol lamp rapid curing.The clamping of the fixture and modulator chip of optic fibre end is unclamped after solidification, will be modulated
The devices such as device, gyro light source, detector, coupler, fiber optic loop are removed simultaneously together with tail optical fiber, and now whole light path has been connected
Finish.Contact conductor welding, the protection of electrode gluing are carried out with gold ball welding apparatus again.Last foundation gyro master-plan, successively will
Device assembling is arranged on gyro enclosure.
High-precision optical fiber gyro weldless preparation method of the present invention is realized integrated optical modulator and fiber optic loop, coupler
The butt coupling of weldless is realized, influence of the fusion point to high-precision optical fiber gyro precision is eliminated, greatly reduces optical fiber top
Polarization interference and error produced by spiral shell light path, break through Gyro Precision limitation.The difficult point of the present invention is the 3rd with bright spot and coupled
The alignment of point.The alignment of 3rd Coupling point is the alignment at fiber optic loop B1 ends and the A2 ends of integrated optical modulator, is in optical fiber
Realized after gyro light path closure using distinctive technology of the invention, the country there is no method to realize this point before.
Claims (5)
1. a kind of high-precision optical fiber gyro weldless preparation method, it is characterised in that be first respectively completed integrated optical modulator core
The polishing of piece end face, coupler fiber end face and the tail optical fiber end face of optical fiber ring assemblies two, then fixed integrated optical modulator core
Piece, and three groups of fiber end faces for completing end face polishing are clamped to sextuple micro-positioning regulators platform；Start to carry out into the first Coupling point
As positioning calibration, one end of fiber optic loop tail optical fiber is then chosen as the progress imaging positioning calibration of the second Coupling point, by fiber optic loop tail
After fine other end at the beginning of the 3rd Coupling point as positioning, essence is carried out again to the 3rd Coupling point using tilter and gyroscopic effect
Really calibration, after the completion of debugging calibration, each Coupling point of point adhesive curing.
2. high-precision optical fiber gyro weldless preparation method according to claim 1, its feature further comprises following step
Suddenly：
Step 1：Carry out integrated optical modulator chip end face, coupler fiber end face, at the polishing of the tail optical fiber end face of fiber optic loop two
Reason；
Step 2：Integrated optical modulator chip is placed on fixed support fixture, the optical fiber end of each Coupling point is separately fixed at six
On Wei Weidongtiaojietai；
Step 3：Thang-kng position alignment is carried out by feux rouges and infrared light, the alignment of first Coupling point is completed；
Step 4：Respectively initial alignment is carried out to second with the 3rd Coupling point；
Step 5：By applying sinusoidal and square-wave modulation signal on integrated optical modulator chip, and utilize gyroscopic effect signal
Shape carries out light path on-line optimization debugging with amplitude, and completion is accurately aligned to the 3rd Coupling point；
Step 6：The joint debugging of high-precision optical fiber gyro is completed by the Performance Match of optical fibre gyro device；
Step 7：To Coupling point carry out dispensing fix and carry out the making of integrated optical modulator lead and gyro coiling assembling etc.
Subsequent technique process.
3. high-precision optical fiber gyro weldless preparation method according to claim 2, it is characterised in that：In step 4, to
Two using the mode in fiber optic loop other end detection luminous power and extinction ratio with after the 3rd Coupling point definition, being completed to second
The initial alignment of Coupling point；Based on the stability of sextuple micro-positioning regulators platform, the end positions of Coupling point are marked record scale,
And recover mark position in the process after.
4. high-precision optical fiber gyro weldless preparation method according to claim 2, it is characterised in that：In step 5, use
Signal generator is modulated to integrated optical modulator, and based on optical fibre gyro effectiveness and sextuple micro-positioning regulators platform to coupling
The Coupling point of point, particularly the 3rd is accurately aligned, and passes through Sine Modulated and the further optimizing regulation of square-wave frequency modulation.
5. high-precision optical fiber gyro weldless preparation method according to claim 2, it is characterised in that：In step 6, six
The upper online Performance Match joint debugging tests for carrying out optical fibre gyro device of Wei Weidongtiaojietai, so that fiber optic gyroscope performance be adjusted to
It is optimal.
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| CN108646353B (en) * | 2018-04-28 | 2019-12-17 | 北京航空航天大学 | Optical fiber-waveguide automatic alignment coupler based on image processing |
| CN110456468B (en) * | 2019-09-17 | 2024-04-05 | 安徽光纤光缆传输技术研究所(中国电子科技集团公司第八研究所) | Quantum optical device space hybrid integrated assembly |
| CN111805082B (en) * | 2020-07-14 | 2022-07-08 | 大连藏龙光电子科技有限公司 | Surface mounting and welding method for controlling tracking error of coaxial optical device |
| CN113275195B (en) * | 2021-05-06 | 2022-10-28 | 苏州易锐光电科技有限公司 | Optical device and manufacturing method thereof |
| CN116026369B (en) * | 2023-03-30 | 2023-06-02 | 中国船舶集团有限公司第七〇七研究所 | Light path rigid-flexible hybrid assembly method in fiber-optic gyroscope inertial navigation system |
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| DE4223740A1 (en) * | 1992-07-18 | 1994-01-20 | Teldix Gmbh | Combined phase modulator and depolariser for counter-propagating wave optical fibre gyroscope - splices polarisation-maintaining fibre, located on piezoelectric cylinder, to monomode fibre coil, such that main axes of fibres are rotated by forty-five degrees w.r.t. each other |
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