CN102297706A - Fiber bragg grating sensor with metal packaging and manufacturing method thereof - Google Patents
Fiber bragg grating sensor with metal packaging and manufacturing method thereof Download PDFInfo
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- CN102297706A CN102297706A CN2011101351942A CN201110135194A CN102297706A CN 102297706 A CN102297706 A CN 102297706A CN 2011101351942 A CN2011101351942 A CN 2011101351942A CN 201110135194 A CN201110135194 A CN 201110135194A CN 102297706 A CN102297706 A CN 102297706A
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Abstract
The invention discloses a fiber bragg grating sensor with metal packaging and a manufacturing method thereof. According to the invention, on the basis of a specific manufacturing method, a fiber bragg grating is packaged into a steel tube to obtain a fiber bragg grating sensor; compared with the prior art, the technology employed in the invention enables sensitivity of the sensor provided in the invention to be improved; moreover, it is convenient to perform installation.
Description
Technical field
The present invention relates to a kind of optical fiber sensing technology, relate in particular to a kind of fiber Bragg grating sensor.
Background technology
Optical fiber sensing technology is the brand-new technology that forms along with the development of light transmitting fiber and Fibre Optical Communication Technology.The fire prevention of Fibre Optical Sensor, explosion-proof, precision is high, loss is low, volume is little, in light weight, the life-span is long, cost performance is high, reusability is good, response speed is fast, anti-electromagnetic interference (EMI), frequency band range is wide, dynamic range is big, easily be widely used in all trades and professions with advantage such as fibre-optic transmission system (FOTS) composition telemetry network.
Fiber Bragg grating sensor (Fiber Bragg Grating Sensor, FBG) belong to a kind of of Fibre Optical Sensor, sensing process based on fiber grating is by extraneous physical parameter heat transfer agent to be obtained in the modulation of optical fiber Bragg (Bragg) wavelength, is a kind of wavelength-modulated type Fibre Optical Sensor.The sensing mechanism of fiber grating comprises elastic deformation (elastic distortion) and the elasto-optical effect (strain-optic effect) that strain causes, thermal expansion effects that temperature causes (thermo expansion effect) and thermo-optic effect (thermo-optic effect), and the Faraday effect (Faraday effect) that causes of magnetic field, directly responsive based on fiber grating to temperature and strain, can be made into and be used to detect stress, strain, temperature, pressure, vibration, displacement, acceleration, the Fibre Optical Sensor of different kinds of parameters such as inclination angle and optical fiber sensor network.
FBG be the fiber core refractive index along fiber axis to being periodically variable a kind of grating. at present existing all kinds of FBG working sensor principles all can be summed up as to FBG centre wavelength
Measurement, promptly by to causing by external disturbance
The measurement of drift value obtains measured parameter
With fiber core effective refractive index n
EffAnd fiber grating length periods lambda is relevant, promptly
If the centre wavelength that supposition temperature and strain pressure cause is separate, ignore the sensitivity coefficient influence that grating centre wavelength causes
In the formula:
Sensitivity coefficient for fiber grating strain;
Sensitivity coefficient for fiber-optical grating temperature sensor;
Sensitivity coefficient for fiber grating pressure;
Be temperature change value
Be strain,
Strain and temperature can be regarded as independence, linear superposition to the effect of wavelength as can be seen from formula (2) for change value of pressure. if temperature variation is less in the process of the test, can ignore Temperature Influence, then strain stress can be expressed as the variation about the centre wavelength linearity, below identical.
Various variablees influence the mode of wavelength:
A) mode of strain and pressure change centre wavelength:
1, enlarges or dwindle the grating length cycle
2, produce elasto-optical effect
Wherein axial stress changes the coefficient of the wave length shift formula cause and is:
Change the coefficient of the wave length shift formula that causes by pressure:
With
Be bullet light component of tensor (POCKEL coefficient); υ is the Poisson ratio of fiber optic materials; E is an elastic modulus; N is a refractive index, for a sensor, all keeps constant.Common FBG is 1.55 microns a ripple for wavelength,
, KT=11 pm/ ℃, Kp=-3.0 pm/MPa.
Existing sensor package mostly is the base material patch-type; steel disc package method for example; on all sticking card of fiber grating and matrix material; the sticking card of fiber grating often uses epoxy resin ingredient glue; the sticking obedient face of this sensor is often thin can not protect inner grating transducing part for a long time, and is subject to external environment influence.And the encapsulation of most of metal tubes also all just rests on fiber grating is encapsulated in the metal tube, do not consider really how to use in practice: such as tiny capillary tubing is fixed in the object under test, the practical plan majority is that it is imbedded object under test inside, (promptly in the buildings of making building, bridge, it being imbedded interior of building), this packaged type is not suitable for small-sized, and ess-strain detects randomly.
" fiber grating capillary tubing packaging technology and sensing characteristics research " (laser and infrared in the prior art, 2009.1) encapsulation of a kind of capillary tubing disclosed, this paper has compared the sensing sensitivity after bare optical fibers and bare optical gratings and the encapsulation of this capillary tubing, has only about 1.2pm/ μ ε by the actual sensitivity that records of this paper encapsulation.
" a kind of fiber Bragg grating strain sensor of titanium alloy substrate encapsulation " (photoelectric technology is used, 2010.6) discloses a kind of fiber Bragg grating strain sensor with the encapsulation of titanium alloy substrate, and it is 1.2112pm/ μ ε that this paper records sensibility in practice.
" aluminium alloy paillon foil packaged fiber grating sensing characteristic research " (photoelectron. laser 2008.7) disclose with aluminium alloy paillon foil packaged fiber grating sensor, the Metal Packaging mode of this article author designed has reached the strain sensitivity of 1.407 pm/ μ ε, has improved 1.2 times than its bare fibre sensitivity.
" strain and the temperature sensing characteristic research of titanium alloy sheet packaged fiber grating sensor " (photoelectron. laser 2006.5), use titanium alloy sheet packaged fiber grating sensor is disclosed, the author has studied the encapsulation of titanium alloy sheet, and its experimental result shows that this encapsulation can not improve gage factor fully.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, put forward fiber Bragg grating sensor of a kind of Metal Packaging and preparation method thereof, make sensor of the present invention improve strain sensitivity with respect to prior art by specific method for making, and easy for installation.
In order to solve the problems of the technologies described above, technical scheme of the present invention is as follows:
A kind of fiber Bragg grating sensor of Metal Packaging comprises metal tube, bragg grating and is used for fixing bragg grating and the binding of metal tube, metab.Described metal tube adopt Vickers hardness greater than 80 and internal diameter be the stainless-steel tube of 0.3mm greater than 0.3mm, external diameter less than the difference of 1mm, interior external diameter.
As possibility: described metab has described metal tube length between two and two metabs greater than 50mm.
As possibility: described metal tube length is 80mm between two metabs.
As possibility: the both sides of above-mentioned metab main body are rectangular-shaped, two opposite side are the semicylinder shape in addition, described metab respectively has a welding hole that is used for fixing on the both sides near the semicylinder shape, there is a metal aperture that is used to insert described metal tube at the center of described metab, and the center of circle spacing between the described welding hole is that 15mm is to 50mm.
As possibility: the thickness of described metab is that two edge lengths of 4mm, its rectangular parallelepiped are 30mm, and the circular diameter of semicylinder is 10mm, and the welding hole diameter is 5mm, metal pore 1mm.
The method for packing of the fiber Bragg grating sensor of above-mentioned Metal Packaging, it specifically comprises the steps:
1) bragg grating passes metal tube, and is then that optical fiber is stretching;
2) binding that is used for fixing bragg grating and metal tube is fixed metal tube and whole described fiber grating, and described binding spreads upon whole described fiber grating part uniformly, until covering the overall optical gate part.
3) after the described binding of wait solidifies, metal tube is inserted metab, and both are fixed.
As possibility: metab has described metal tube length between two and two metabs greater than 50mm in the described method.
As possibility: in the described method between two metabs described metal tube length be 80mm.
As possibility: the both sides of metab main body are rectangular-shaped described in the described method, two opposite side are the semicylinder shape in addition, described metab respectively has a welding hole that is used for fixing on the both sides near the semicylinder shape, there is a metal aperture that is used to insert described metal tube at the center of described metab, and the center of circle spacing between the described welding hole is that 15mm is to 50mm.
As possibility: the thickness of metab described in the described method is that two edge lengths of 4mm, its rectangular parallelepiped are 30mm, and the circular diameter of semicylinder is 10mm, and the welding hole diameter is 5mm, metal pore 1mm.
Beneficial effect of the present invention:
1. the metal mold method for packing of the present invention's design had both kept the advantage of Metal Packaging; such as high sensitivity; anti-sensitization and fiber grating had good protection; its SMD package method and flush type package method than prior art is stronger for the protection of grating; and can use spot-welded on during for the metal surface when object under test, it is more firm to paste compared with common glue.
2. the present invention has very high gage factor and strain sensitivity enlargement factor (relative bare optical fibers and bare optical gratings), the experiment test result shows that Metal Packaging is difficult to improve the fiber-optic grating sensor strain sensitivity in the prior art, and encapsulation technology of the present invention can improve 1.7 times at least.
3. technology of the present invention is simply with low cost: whole packaging technology need not used any specialist tools or instrument, need not use any precious materials.Structure is small and exquisite: only surplus in the of 10 centimetre, width is less than 4 centimetres for the finished product total length.Because volume is little,, builds the stress monitoring of miniature instrument from large bridge and can both be competent at so the scope of application is very extensive.Measure accurately: use the capillary tubing packaged fiber, do not introduce any large-area substrates material.This has reduced the measuring error that base material causes greatly, especially the hysteresis error that causes because of the elasticity of base material.Firm stable: capillary tubing has hardness and toughness concurrently, and this makes the Fibre Optical Sensor of its encapsulation can adapt to various rugged surroundings.
Description of drawings
Fig. 1 is a front elevation of the present invention;
Fig. 2 is a vertical view of the present invention;
Fig. 3 is the side view of metab of the present invention;
Fig. 4 is the test result figure of example one of the present invention;
Fig. 5 is the test result figure of example two of the present invention;
Fig. 6 compares test result figure for example one of the present invention with the bare optical fibers and bare optical gratings curve.
Embodiment
The present invention will be further described below in conjunction with the drawings and specific embodiments:
Material parameter:
Steel pipe: the steel pipe that adopts 3 kinds of different parameters: internal diameter 0.3mm external diameter 0.6mm, internal diameter 0.5mm external diameter 0.8mm, internal diameter 0.7mm external diameter 1.0mm, length is respectively 80mm, 70mm, 60mm.
Glue, in the process of selecting resin glue, we examine or check the glue of several different performances respectively, comprise AB type glue, E51 resin glue and the E44 resin glue of common glue, 1:2,1:3, and metal stainless steel special glue, show by experiment all and can realize function.
Metab: adopt dimensional parameters: thickness 3mm, 4mm, 5mm, length 30mm, semicircle diameter 10mm, welding hole diameter 5mm, steel pipe hole 1mm.
Example one:
Fiber grating is bonding with glue and thin metal pipe, put metab at the two ends of metal tube, metab is provided with solder joint, is used for welding with object under test.Concrete steps and parameter are as follows:
Stainless-steel tube as shown in Figure 1, select internal diameter 0.7mm external diameter 1.0mm, length 80mm(can suitably change, and guarantees that the grating part can all be covered by steel pipe) we select the AB type glue of 1:3 to be used for bonding fiber grating and metal tube, and combining between metal tube and the metab.As Fig. 2, metab shown in Figure 3, select dimensional parameters: thickness 4mm, length 30mm, semicircle diameter 10mm, welding hole diameter 5mm, steel pipe hole 1mm.Packaging environment is to encapsulate under 16.7 ° room temperature normal pressure.
Operation steps:
Fiber grating is passed steel pipe, with optical fiber stretching (noting not exerting oneself the excessive grating part that causes destroying), to be rolled on the thin stick by the AB glue that 1:3 mixes, spread upon whole optical fiber grating department branch uniformly, with steel pipe along grating from left to right, moving around from right to left makes gluing even several times, covers the overall optical gate part at last, erase and stay quiet putting about 30 minutes behind the outside glue, wait for that the glue solidifies.The special-purpose AB glue of metal stainless steel is spread upon the steel pipe two ends uniformly, put metab, moving around makes gluing even several times, leaves standstill about 30 minutes, waits for that the glue solidifies, promptly finishes encapsulation.
Example two:
Fiber grating is bonding with glue and thin metal pipe, put metab at the two ends of metal tube, metab is provided with solder joint, is used for welding with object under test.Concrete steps and parameter are as follows:
Stainless-steel tube, select internal diameter 0.3mm external diameter 0.6mm, length 70mm(can suitably change, and guarantee carving the grating part can all be covered by steel pipe) we select the AB type glue of 1:2 to be used for bonding fiber grating and metal tube, and combining between metal tube and the metab.Metab, select dimensional parameters: thickness 5mm, length 50mm, semicircle diameter 10mm, welding hole diameter 5mm, steel pipe hole 1mm, the concrete operations step is as mentioned above.
The concrete testing procedure of experimental result:
1. with AB glue sensor to be measured is sticked on to go to the bottom and be respectively 1cm, 3cm, long 10cm, on the trapezoidal non-corrosive steel cantilever beam of thick 3mm, and the accurate recording paste position, two metal firm bankings are sticked on the semi-girder.
2. after treating that AB glue solidifies fully, connect and measure light path.Inject sensor with wideband light source through wire jumper and circulator, again the sensor reflected light is injected spectrometer through circulator, by the spectrometer measurement reflectance spectrum.
3. apply external force by counterweight to semi-girder.Start from scratch every increase 250g weight measurement once, up to adding the 2000g counterweight.Begin to subtract counterweight then, whenever subtract the 250g weight measurement once, up to subtracting back zero.The wavelength of each survey record spectrum peak correspondence.The spectrum peak wavelength of the process that relatively increases weight and loss of weight process, simultaneously, the each temperature of measuring of record.
The concrete outcome of example one test as shown in Figure 4, slope error is (standard deviation is divided by value) about 0.7%.Slope is 2.77pm/ μ ε, resolution 27 μ ε, and precision is 17 μ ε.
The concrete outcome of example two test as shown in Figure 5, slope error is about 1%.Slope is 2.77pm/ μ ε, resolution 28 μ ε, and precision is 17 μ ε.Repeatability is to the 0.005nm that influences of precision, and total precision is 22 μ ε.
Implement a test result and compare the result as shown in Figure 6 with bare optical fibers and bare optical gratings, relatively the curve of Metal Packaging and bare optical fibers and bare optical gratings can be found, Metal Packaging has played certain sensitization, owing to the increase of sensitivity, though resolution has a small amount of decline, precision improves simultaneously.
Returning stagnant precision in the above-mentioned measuring process is 3%, and reproducibility error is 2.3%, and total precision is about 3.7%, and the total range of this sensor is about 1600 μ ε.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, without departing from the inventive concept of the premise; can also make some improvements and modifications, these improvements and modifications also should be considered within the scope of protection of the present invention.
Claims (10)
1. the fiber Bragg grating sensor of a Metal Packaging, comprise metal tube, bragg grating and be used for fixing bragg grating and the binding of metal tube, it is characterized in that: also comprise metab, described metal tube adopt Vickers hardness greater than 80 and internal diameter be the stainless-steel tube of 0.3mm greater than 0.3mm, external diameter less than the difference of 1mm, interior external diameter.
2. the fiber Bragg grating sensor of a kind of Metal Packaging according to claim 1 is characterized in that: described metab has described metal tube length between two and two metabs greater than 50mm.
3. the fiber Bragg grating sensor of a kind of Metal Packaging according to claim 1, it is characterized in that: described metal tube length is 80mm between two metabs.
4. according to the fiber Bragg grating sensor of any described a kind of Metal Packaging of claim 1 ~ 3, it is characterized in that: the both sides of described metab main body are rectangular-shaped, two opposite side are the semicylinder shape in addition, described metab respectively has a welding hole that is used for fixing on the both sides near the semicylinder shape, there is a metal aperture that is used to insert described metal tube at the center of described metab, and the center of circle spacing between the described welding hole is that 15mm is to 50mm.
5. the fiber Bragg grating sensor of a kind of Metal Packaging according to claim 4, it is characterized in that: the thickness of described metab is that two edge lengths of 4mm, its rectangular parallelepiped are 30mm, the circular diameter of semicylinder is 10mm, and the welding hole diameter is 5mm, metal pore 1mm.
6. the method for packing of the fiber Bragg grating sensor of a kind of Metal Packaging according to claim 1 is characterized in that: comprise the steps:
1) bragg grating passes metal tube, and is then that optical fiber is stretching;
2) binding that is used for fixing bragg grating and metal tube is fixed metal tube and whole described fiber grating, and described binding spreads upon whole described fiber grating part uniformly, until covering the overall optical gate part.
3) after the described binding of wait solidifies, metal tube is inserted metab, and both are fixed.
7. the method for packing of the fiber Bragg grating sensor of a kind of Metal Packaging according to claim 6 is characterized in that: described metab has described metal tube length between two and two metabs greater than 50mm.
8. the method for packing of the fiber Bragg grating sensor of a kind of Metal Packaging according to claim 6, it is characterized in that: described metal tube length is 80mm between two metabs.
9. according to the method for packing of the fiber Bragg grating sensor of any described a kind of Metal Packaging of claim 6 ~ 8, it is characterized in that: the both sides of described metab main body are rectangular-shaped, two opposite side are the semicylinder shape in addition, described metab respectively has a welding hole that is used for fixing on the both sides near the semicylinder shape, there is a metal aperture that is used to insert described metal tube at the center of described metab, and the center of circle spacing between the described welding hole is that 15mm is to 50mm.
10. the method for packing of the fiber Bragg grating sensor of a kind of Metal Packaging according to claim 9, it is characterized in that: the thickness of described metab is that two edge lengths of 4mm, its rectangular parallelepiped are 30mm, the circular diameter of semicylinder is 10mm, the welding hole diameter is 5mm, metal pore 1mm.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944341A (en) * | 2012-11-14 | 2013-02-27 | 中天日立光缆有限公司 | Transmission line fiber grating stress sensor |
| CN103273183A (en) * | 2013-06-17 | 2013-09-04 | 南昌大学 | Capillary spot welding packaging process for applying prestressing force on fiber bragg grating |
| CN104279974A (en) * | 2014-09-28 | 2015-01-14 | 中国船舶重工集团公司第七一九研究所 | Split type optic fiber strain sensor assembly |
| CN106840018A (en) * | 2016-11-02 | 2017-06-13 | 北京信息科技大学 | A kind of fiber Bragg grating strain sensor method for packing |
| CN107907069A (en) * | 2017-12-27 | 2018-04-13 | 北京信息科技大学 | A kind of substrate formula temperature strain measurement FBG sensor and performance test methods |
| CN108204866A (en) * | 2018-01-04 | 2018-06-26 | 长飞光纤光缆股份有限公司 | A kind of non-calibrating tandem type fiber-optical grating temperature sensor preparation method and product |
| CN108716933A (en) * | 2018-06-20 | 2018-10-30 | 河海大学 | Clipping optical fibre Bragg optical grating strain and crack sensing device |
| CN108871386A (en) * | 2018-04-20 | 2018-11-23 | 武汉中航传感技术有限责任公司 | A kind of patch type fibre optical sensor protective device and its installation method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2706739Y (en) * | 2004-05-10 | 2005-06-29 | 欧进萍 | Pre-stretching optical fiber raster big-scalar range strain sensor |
| CN1743795A (en) * | 2005-09-30 | 2006-03-08 | 大连理工大学 | Optical fiber grating displacement sensor |
| US20060133729A1 (en) * | 2004-12-20 | 2006-06-22 | Cho Seung H | Method for fabricating laser diode having optical fiber Bragg grating as front mirror of external resonator and laser diode fabricated thereby |
| CN201535667U (en) * | 2009-09-18 | 2010-07-28 | 昆明理工大学 | Double tube fiber Bragg grating strain sensor insensitive to temperature change |
-
2011
- 2011-05-24 CN CN2011101351942A patent/CN102297706A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2706739Y (en) * | 2004-05-10 | 2005-06-29 | 欧进萍 | Pre-stretching optical fiber raster big-scalar range strain sensor |
| US20060133729A1 (en) * | 2004-12-20 | 2006-06-22 | Cho Seung H | Method for fabricating laser diode having optical fiber Bragg grating as front mirror of external resonator and laser diode fabricated thereby |
| CN1743795A (en) * | 2005-09-30 | 2006-03-08 | 大连理工大学 | Optical fiber grating displacement sensor |
| CN201535667U (en) * | 2009-09-18 | 2010-07-28 | 昆明理工大学 | Double tube fiber Bragg grating strain sensor insensitive to temperature change |
Non-Patent Citations (2)
| Title |
|---|
| 任亮: "光纤光栅传感技术在结构健康监测中的应用", 《中国博士学位论文全文数据库 工程科技II辑》, 15 August 2008 (2008-08-15) * |
| 周智等: "光纤光栅毛细钢管封装工艺及其传感特性研究", 《中国激光》, vol. 29, no. 12, 31 December 2002 (2002-12-31) * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944341A (en) * | 2012-11-14 | 2013-02-27 | 中天日立光缆有限公司 | Transmission line fiber grating stress sensor |
| CN102944341B (en) * | 2012-11-14 | 2014-12-17 | 中天日立光缆有限公司 | Transmission line fiber grating stress sensor |
| CN103273183A (en) * | 2013-06-17 | 2013-09-04 | 南昌大学 | Capillary spot welding packaging process for applying prestressing force on fiber bragg grating |
| CN104279974A (en) * | 2014-09-28 | 2015-01-14 | 中国船舶重工集团公司第七一九研究所 | Split type optic fiber strain sensor assembly |
| CN106840018A (en) * | 2016-11-02 | 2017-06-13 | 北京信息科技大学 | A kind of fiber Bragg grating strain sensor method for packing |
| CN107907069A (en) * | 2017-12-27 | 2018-04-13 | 北京信息科技大学 | A kind of substrate formula temperature strain measurement FBG sensor and performance test methods |
| CN108204866A (en) * | 2018-01-04 | 2018-06-26 | 长飞光纤光缆股份有限公司 | A kind of non-calibrating tandem type fiber-optical grating temperature sensor preparation method and product |
| CN108871386A (en) * | 2018-04-20 | 2018-11-23 | 武汉中航传感技术有限责任公司 | A kind of patch type fibre optical sensor protective device and its installation method |
| CN108716933A (en) * | 2018-06-20 | 2018-10-30 | 河海大学 | Clipping optical fibre Bragg optical grating strain and crack sensing device |
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Application publication date: 20111228 |