CN105157676A - Novel inclination measuring apparatus based on all-photonic crystal fiber interferometer - Google Patents
Novel inclination measuring apparatus based on all-photonic crystal fiber interferometer Download PDFInfo
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- CN105157676A CN105157676A CN201510531899.4A CN201510531899A CN105157676A CN 105157676 A CN105157676 A CN 105157676A CN 201510531899 A CN201510531899 A CN 201510531899A CN 105157676 A CN105157676 A CN 105157676A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C9/00—Measuring inclination, e.g. by clinometers, by levels
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Abstract
The invention provides a novel inclination measuring apparatus based on an all-photonic crystal fiber interferometer. The apparatus mainly comprises a wide-spectrum light source 1, a circulator 2, an inclination converter 4 and the all-photonic crystal fiber interferometer 5. The inclination converter 4 which is simple and high in conversion efficiency is designed to convert inclinations in various directions into strains, and the all-photonic crystal fiber interferometer 5 of reflective type is also designed to measure the strains. Upon a change in the inclination of the inclination converter 4, strain of the all-photonic crystal fiber interferometer 5 changes, a spectroscope is driven to detect a movement outputting spectrum, and thus inclination measurement is achieved. Experimental results show that the apparatus is capable of continuously measuring inclinations from 0 degree to 90 degrees and is available for linear high-sensitivity measurement in the range of from 0 degrees to 45 degrees. The apparatus has the advantages of simple structure, small size, insensitiveness to temperature and electromagnetism and the like.
Description
Technical field
The present invention is a kind of novel tilt angle measuring apparatus based on full photonic crystal fiber interferometer, belongs to fiber optic sensor technology field.
Background technology
Inclination sensor, for measuring the angular deflection of an object relative to datum line or reference surface, can be applied to a lot of engineering and military field.Traditional inclination sensor exists that cost is high, poor durability, be easily disturbed, the problem such as long range propagation signal attenuation.Fibre Optical Sensor owing to not needing power supply, size is little, multiplexing capacity is strong, highly sensitive, not by electromagnetic interference (EMI) and the advantage such as little and being paid close attention to of decaying, be applied to measuring the physical quantitys such as pressure, acceleration, displacement and ultrasound wave, these advantages also make optical fiber be specially adapted to pitch angle sensing simultaneously.
The optical fiber inclination sensor of current existence mainly contains fiber Bragg grating type inclination sensor and interfere type inclination sensor.Wherein the people such as Wang devised a kind of fiber grating inclination sensor in 2011, they LPFG is pasted onto sideling sucrose solution is housed plexi-glass tubular in make a kind of novel one dimension wide-measuring range inclination sensor.The grating length be immersed in sucrose solution changes along with the change at pitch angle, causes the change of corresponding LPFG centre wavelength.Corresponding pitch angle size can be recorded by monitoring center's changed wavelength.In addition, the people such as Guan proposed a kind of structure adding vertical pendulum based on two couples of FBG in 2004, utilized every a pair FBG reflection wavelength difference to measure pitch angle.The people such as Bao quadrant of being separated by by two FBG in 2010 is attached to a upper part hollow lower and divides on solid right cylinder.The people such as Guan proposed a kind of structure adding vertical pendulum based on two couples of FBG in 2004, utilize every a pair FBG reflection wavelength difference to pitch angle of encoding.When run-off the straight, FBG reflection wavelength divides, and obtains pitch angle by observing two intervals dividing peak.But there is Temperature cross-over tender subject in the inclination sensor using fiber grating to make.
Interfere type optical fiber inclination sensor is the principles of construction based on optical interdferometer, mainly contains Michelson interfere type and Mach-Zehnder interfere type.The people such as Amaral constructed a kind of compact drawing based on optical fiber and bore Michelson interfere type inclination sensor in 2011.When by bore rotate centered by district time, the variable effect core mode of angle, to the coupling of cladding mode, causes the change of core mode and cladding mode optical path difference, causes the change of interferometric phase, by demodulation phase change can obtain pitch angle size.The people such as Chen proposed a kind of comparatively short distance of being separated by erbium doped fiber and introduce two and draw cone to make Mach-Zehnder interfere type inclination sensor in 2013.When rotating optical fiber on the right side of it centered by the second Ge Zhui district, being coupled of core mode and cladding mode can be affected, and then cause the change of interferometric phase.Interfere type optical fiber inclination sensor cost is low, precision is high, but can not be multiplexing in a large number, and be difficult to realize distributed measurement, the problem of simultaneous temperature cross sensitivity still exists.
The present invention devises a kind of novel tilt angle measuring apparatus based on full photonic crystal fiber interferometer, and this device, except having the advantage at general optical fiber measurement pitch angle, also has temperature, the advantage such as electromagnetism is insensitive, volume is little, and device is simple.
Summary of the invention
(1) technical matters that, will solve
The present invention mainly solves that the cost that traditional slant angle sensor exists is high, poor durability, be easily disturbed, the Temperature cross-over tender subject that long range propagation signal attenuation, the problem such as pitch angle can only measuring a direction and ordinary optic fibre inclination sensor exist.
(2), technical scheme
In order to achieve the above object, the invention provides a kind of novel tilt angle measuring apparatus based on full photonic crystal fiber interferometer.Mainly comprise the wide spectrum light source that wavelength coverage is 1520nm ~ 1570nm, circulator, spectrometer, pitch angle conversion equipment, full photonic crystal fiber interferometer, wherein, wide spectrum light source is connected with first port of circulator, second port of circulator is connected with full photonic crystal fiber interferometer, 3rd port of circulator is connected with spectrometer, wherein full photonic crystal fiber interferometer is pasted onto above the semi-girder of tilting gearing, when the change that the pitch angle of pitch angle conversion equipment occurs, due to Action of Gravity Field, semi-girder bends and produces deformation, thus make stickup full photonic crystal fiber interferometer generation deformation on a cantilever beam, then the interference spectum of spectrometer record will change, thus reach the object measuring pitch angle.
In such scheme, pitch angle conversion equipment mainly by upper cover, iron ball, pillar, semi-girder, go to the bottom composition, iron ball is placed on the central authorities gone to the bottom, and semi-girder is pasted onto the central authorities of four sides of going to the bottom, the tip of semi-girder just touches with iron ball, the organic glass thin slice of the upper cover of pitch angle conversion equipment and the 1mm that goes to the bottom that be the length of side to be 50mm thickness be, pillar is high is 50mm, and cross section is 25mm
2rectangular parallelepiped organic glass, the diameter of iron ball is 50mm, weight is 500g, semi-girder is base is 10mm, is highly 26mm, and thickness is the isosceles triangle organic glass of 1mm, after pitch angle conversion equipment has certain pitch angle, due to the pressure effect of iron ball, semi-girder bends and produces deformation, reaches object pitch angle being converted to strain.Because the four direction of pitch angle conversion equipment is all pasted with semi-girder, therefore the pitch angle in each direction can convert the strain variation of corresponding semi-girder to, each semi-girder is pasted with full photonic crystal fiber interferometer, for detecting strain signal simultaneously.
In such scheme, full photonic crystal fiber interferometer is formed the first subsidence area and second subsidence area by one section of photonic crystal fiber through overdischarge and behind second subsidence area, plate one deck silverskin to form.Wide spectrum optical, at first subsidence area punishment light, enters respectively in the fibre core of photonic crystal fiber and covering and propagates, and meet at first subsidence area place formation interference spectrum carry out record by spectrometer after second subsidence area and silverskin are reflected.Cause the refringence of the cladding mode of photonic crystal fiber and fibre core pattern to change when the strain of full photonic crystal fiber interferometer changes and cause interference spectrum to be moved, thus reaching the object of monitor strain.Simultaneously due to the characteristic of photonic crystal fiber, the full photonic crystal fiber interferometer of the present invention's design is to temperature-insensitive.
First subsidence area in such scheme and the distance of second subsidence area are 2cm, and wherein photonic crystal fiber core diameter is 9 μm, and cladding diameter is 125 μm and has diameter is 5 μm, and gap is 7.5 μm of five layer of air hole.
Subsidence area described in such scheme, refer to that photonic crystal fiber makes the photonic crystal fiber airport of certain length subside by the electric discharge of optical fiber splicer, the length of subsidence area can be controlled by the strength of discharge changing optical fiber splicer, first subsidence area length is 130 μm in the present invention, and second subsidence area length is 60 μm.
Silverskin described in such scheme, refers to and is reacted generated silverskin by configuration silver ammino solution and glucose solution.Silver film thickness can control by controlling solution concentration, and silver film thickness is 2 μm in the present invention.
(3), beneficial effect
As can be seen from technique scheme, the present invention has following beneficial effect:
1) pitch angle of all directions dress can be changed to strain by pasting semi-girder at four sides by the pitch angle conversion equipment of the present invention's design, has structure simple, the feature of high conversion efficiency.
2) the full photonic crystal fiber interferometer of the present invention's design, have structure simple, easy to make, monitor strain is highly sensitive, does not need the feature of multiple fused fiber splice.
3) the present invention can measure the pitch angle of all directions, and have that scope is wide, volume is little, highly sensitive, to temperature and the insensitive advantage of electromagnetism.
(4), accompanying drawing explanation
Fig. 1 is a kind of tilt angle measuring apparatus figure based on full photonic crystal fiber interferometer.
Fig. 2 is pitch angle conversion equipment inclination schematic diagram.
Fig. 3 is the interference light spectrogram of different inclination angle.
Fig. 4 is the matched curve figure of pitch angle and characteristic wavelength.
Fig. 5 is the curve map carrying out linear fit at 0 ° ~ 45 °.
(5), embodiment
For making above-mentioned purpose, advantage more understandable, below in conjunction with accompanying drawing and embodiment, the present invention is further described.
As shown in Figure 1, wide spectrum light source 1 is connected with first port 21 of circulator 2, second port 22 of circulator 2 is connected with full photonic crystal fiber interferometer 5,3rd port 23 of circulator 2 is connected with spectrometer 3, and wherein full photonic crystal fiber interferometer 5 is pasted onto above the semi-girder 9 of tilting gearing 4.The four direction of pitch angle conversion equipment is all pasted with semi-girder, each semi-girder is pasted with full photonic crystal fiber interferometer simultaneously.Pitch angle conversion equipment 4 is mainly by upper cover 6, iron ball 7, pillar 8, semi-girder 9, to go to the bottom 10 compositions, iron ball be placed on go to the bottom 10 central authorities, semi-girder 9 be pasted onto go to the bottom 10 the central authorities on four limits, the tip of semi-girder 9 just touches with iron ball, the organic glass thin slice of the upper cover 6 of pitch angle conversion equipment 4 and the 1mm that goes to the bottom 10 are length of sides to be 50cm thickness be, pillar 8 is long is 50mm, and base is the rectangular parallelepiped of 5mm, and the diameter of iron ball 7 is 50mm, weight is 500g, semi-girder 9 is bases is 10mm, is highly 26mm, and thickness is the isosceles triangle of 1mm.Full photonic crystal fiber interferometer 5 is formed the first subsidence area 12 and second subsidence area 13 by one section of photonic crystal fiber 11 through overdischarge and behind second subsidence area 13, plate one deck silverskin 14 to form.After pitch angle conversion equipment 4 has certain pitch angle, due to the pressure effect of iron ball 7, semi-girder 9 produces deformation, and drive the full photonic crystal fiber interferometer 5 be pasted onto on semi-girder 9 that deformation occurs, and then cause the refringence of the cladding mode of photonic crystal fiber 11 and fibre core pattern to change and cause interference spectrum to be moved, reach the object measuring pitch angle.It is as follows that first subsidence area 12 and second subsidence area 13 form method:
1. with optical fiber pincers, the coat of photonic crystal fiber is peelled off, and have alcohol wipe clean.
2. photonic crystal fiber is put into fused fiber splice, will treat that collapse position aims at electric discharge probe, and strength of discharge will be set, and start electric discharge, complete the making of first subsidence area 12.
3. taken out by photonic crystal fiber, mobile 2cm, completes the making of second subsidence area 13.
It is as follows that silverskin 14 forms method:
1. be 0.2%SnCl with massfraction
2solution soaks the position 20min of photonic crystal fiber silvered mirror.
2. be the Ag (NO of 0.1mol/L by 2mL volumetric molar concentration
3) solution to add in container and to stir.
3. by volumetric concentration be 20% ammoniacal liquor drop by drop add Ag (NO
3) solution & stir, now solution can become brown by clarification, continues to add ammoniacal liquor till solution colour becomes clarification again.
4. by 1.4mL volumetric molar concentration be the KOH solution of 0.8mol/L add above be uniformly mixed in liquid, now solution colour becomes black.
5. by ammoniacal liquor drop by drop add above-mentioned agitating solution until solution becomes clarification from black, then prepared silver ammino solution.
6. by photonic crystal fiber from SnCl
2take out in solution, and rinse with distilled water, and photonic crystal fiber silvered mirror part is put into the silver ammino solution prepared, adjust fiber position, then in this solution, add the glucose solution that 0.4mL volumetric molar concentration is 0.25mol/L, now silver mirror reaction gets started generation.Wait for sufficient reacting, then optical fiber is taken out, and rinse optical fiber gently with distilled water.
7. optical fiber dried in atmosphere or dry up with nitrogen.
Afterwards full photonic crystal fiber 5 is pasted onto on the semi-girder 9 of pitch angle conversion equipment 4, by the height changing inclination conversion equipment, angle of inclination is changed between 0o ~ 90o, and record interference spectrum.
Fig. 2 is pitch angle conversion equipment inclination schematic diagram.When pitch angle converter device 4 has a pitch angle, there is deformation in semi-girder 9, and drive the full photonic crystal fiber interferometer 5 pasted on a cantilever beam that deformation occurs.
Fig. 3 is the interference light spectrogram of different inclination angle.Changed within the scope of 0 ° ~ 90 ° by pitch angle by the height changing pitch angle conversion equipment 4 a direction.As can be seen from Figure 3 along with the increase at pitch angle, spectral red shift, the middle trough wavelength of interference spectrum is designated as characteristic wavelength, when not tilting, characteristic wavelength occurs in 1557nm place, along with the increase characteristic wavelength at pitch angle is moved to the left, when inclination angle is increased to 90o, characteristic wavelength moves 3.27nm.
Fig. 4 is the matched curve figure of pitch angle and characteristic wavelength.Can demarcating the relation between pitch angle and characteristic wavelength by Fig. 4, afterwards by measuring the movement of characteristic wavelength, just can measure the size at pitch angle, as can be seen from Figure 4, the present invention can the pitch angle of continuous coverage 0 ° ~ 90 °.
Fig. 5 is the curve map carrying out linear fit at 0 ° ~ 45 °.As seen in Figure 5 the present invention can again 0 ° ~ 45 ° within the scope of realize linear, highly sensitive measurement, its sensitivity can reach 55.67pm/ °.
Claims (3)
1. the novel tilt angle measuring apparatus based on full photonic crystal fiber interferometer, mainly comprise the wide spectrum light source that wavelength coverage is 1520nm ~ 1570nm, circulator, spectrometer, pitch angle conversion equipment, full photonic crystal fiber interferometer, it is characterized in that: wide spectrum light source is connected with first port of circulator, second port of circulator is connected with full photonic crystal fiber interferometer, 3rd port of circulator is connected with spectrometer, wherein full photonic crystal fiber interferometer is pasted onto above the semi-girder of pitch angle conversion equipment, after pitch angle conversion equipment has certain pitch angle, due to the pressure effect of iron ball, semi-girder produces deformation, and drive the full photonic crystal fiber interferometer generation deformation of pasting on a cantilever beam, and then cause the refringence of the cladding mode of photonic crystal fiber and fibre core pattern to change and cause interference spectrum to be moved, the object measuring unknown pitch angle just can be reached by the relation of demarcating between the amount of movement of interference spectrum and pitch angle.
2. pitch angle as claimed in claim 1 conversion equipment is characterized in that: pitch angle conversion equipment is a kind of device change at all directions pitch angle being converted to semi-girder strain variation, mainly by upper cover, iron ball, pillar, semi-girder, going to the bottom forms, wherein iron ball is placed on the central authorities gone to the bottom, semi-girder is pasted onto the central authorities of lower bottom side, the tip of semi-girder just contacts with iron ball, wherein upper cover and to go to the bottom be the length of side be 50mm, thickness is the organic glass thin slice of 1mm, pillar is high is 50mm, and cross section is 25mm
2rectangular parallelepiped organic glass, the diameter of iron ball is 50mm, weight is 500g, semi-girder is base is 10mm, be highly 26mm, thickness is the isosceles triangle organic glass of 1mm, after pitch angle conversion equipment has certain pitch angle, due to the pressure effect of iron ball, semi-girder bends and produces deformation, because the four direction of pitch angle conversion equipment is all pasted with semi-girder, therefore the tilt angle varied of all directions can be converted to the strain variation of corresponding semi-girder, each semi-girder is pasted with full photonic crystal fiber interferometer simultaneously, for detecting strain signal.
3. full photonic crystal fiber interferometer as claimed in claim 1 is characterized in that: full photonic crystal fiber interferometer refers to that at one section of core diameter be 9 μm, cladding diameter is 125 μm and has diameter is 5 μm, gap is make the subsidence area that two width are respectively 130 μm and 60 μm in the photonic crystal fiber in the five layer of air holes of 7.5 μm, and behind second subsidence area, plate the thick silverskin of one deck 2 μm, this full photonic crystal fiber interferometer is reflective structure and is all made up of photonic crystal fiber, wide spectrum optical is at first subsidence area punishment light, enter respectively in the fibre core of photonic crystal fiber and covering and propagate, running into second subsidence area and silverskin back reflection is returned, and meet at first subsidence area place interfere and carry out record interference spectrum by spectrometer, this interference spectrum can be moved along with the strain variation of full photonic crystal fiber interferometer.
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| CN105806262A (en) * | 2016-04-28 | 2016-07-27 | 东华大学 | Inclination metering system and method based on low-coherence interference technique |
| CN108885093A (en) * | 2016-03-28 | 2018-11-23 | 沙特阿拉伯石油公司 | System and method for constructing and testing recombination photons structure |
| CN110108384A (en) * | 2019-05-16 | 2019-08-09 | 东北大学 | Based on hollow-core fiber surface plasma resonance in fine formula temperature sensor and detection method |
| CN112902921A (en) * | 2021-01-26 | 2021-06-04 | 哈尔滨工程大学 | Force balance push-pull type optical fiber two-dimensional inclination measuring device |
| CN113029102A (en) * | 2021-04-26 | 2021-06-25 | 四川大学 | Inclination angle measuring device for house safety monitoring |
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| CN105806262B (en) * | 2016-04-28 | 2018-06-22 | 东华大学 | A kind of inclination measurement system and method based on low coherence interference technology |
| CN110108384A (en) * | 2019-05-16 | 2019-08-09 | 东北大学 | Based on hollow-core fiber surface plasma resonance in fine formula temperature sensor and detection method |
| CN112902921A (en) * | 2021-01-26 | 2021-06-04 | 哈尔滨工程大学 | Force balance push-pull type optical fiber two-dimensional inclination measuring device |
| CN113029102A (en) * | 2021-04-26 | 2021-06-25 | 四川大学 | Inclination angle measuring device for house safety monitoring |
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