CN206146385U - Stay cord formula wide -range fiber grating displacement sensor - Google Patents
Stay cord formula wide -range fiber grating displacement sensor Download PDFInfo
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- CN206146385U CN206146385U CN201621052415.4U CN201621052415U CN206146385U CN 206146385 U CN206146385 U CN 206146385U CN 201621052415 U CN201621052415 U CN 201621052415U CN 206146385 U CN206146385 U CN 206146385U
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- displacement
- cantilever beam
- driving axle
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- range
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Abstract
The utility model relates to a stay cord formula wide -range fiber grating displacement sensor belongs to light electronic measurement technique field. The utility model discloses an optic fibre bragg grating, cantilever beam, central transmission axle, bearing I, bearing II, torque spring, screw, displacement conversion device, metal carton, wire rope, external optic fibre. Wherein optic fibre bragg grating, cantilever beam, bearing, central transmission bearing seal are adorned inside the metal carton, paste optic fibre bragg grating in cantilever beam both sides and concatenate the back and draw the box by external optic fibre. The outer displacement conversion device that makes things convenient for the dismouting that adopts of box for adjustment displacement sensor's range makes displacement sensor have more extensive suitability. The utility model discloses can realize the on -line monitoring of displacement, have simple structure simultaneously, convenient to use, the interference killing feature is strong, and the range is adjustable, the wide characteristics of application scope.
Description
Technical field
This utility model is related to a kind of dragline type wide-range fiber grating displacement sensor, belongs to photoelectron e measurement technology neck
Domain.
Background technology
Optical fiber grating sensing is New Sensing Technology developed in recent years.Fiber grating has electromagnetism interference, spirit
Sensitivity is high, high pressure resistant, it is corrosion-resistant the advantages of, be used in various materials and construction inner enter trip temperature and strain measurement, receive
The concern of more and more scholars is arrived, with huge development prospect.Different type can be designed using the advantage of fiber grating
Sensor, apply in a variety of fields, fiber grating displacement sensor has high precision, electromagnetism interference, chemical
Matter is stable and the characteristics of meeting distributed measurement, but is typically designed that range is less, it is difficult to meet the displacement measurement of large scale structure
Require, such as tunnel, bridge, landslide etc..
The main sensing element of fiber grating displacement sensor has a cantilever beam structure, simple beam structure and on this basis
It is optimized, or designs other frame for movements, realizes displacement measurement.Can obtain not commensurability using different structure frame for movement
The displacement transducer of journey, but it is fixed to be typically designed range, and this causes the range of application of displacement transducer to be very limited.
By designing a kind of dismantled and assembled displacement converter device, easily change the range of fiber grating displacement sensor, further encapsulation
Into the sensor of suitable engineer applied, to adapt to the measurement requirement of varying environment, expand the range of application of displacement transducer.
The content of the invention
This utility model provides a kind of dragline type wide-range fiber grating displacement sensor, and simple structure, range is adjustable,
It is easy for installation, can solve when displacement line is monitored, the structure of optical fiber Bragg raster displacement transducer, installation question.
The technical scheme that this utility model solution technical problem is adopted is as follows：A kind of dragline type wide-range fiber grating position
Displacement sensor, it is characterised in that the sensor include optical fiber Bragg raster, cantilever beam, bearing, center driving axle, torque spring,
Displacement converter device, screw, external optical fiber, steel wire rope, can, wherein two optical fiber Bragg rasters of different centre wavelengths
The both sides of cantilever beam are symmetrically pasted onto, center driving axle is arranged between two bearings, is fixed on the inwall of can, passes through
Steel wire rope is connected it with the free end of cantilever beam, is fixed displacement converter device with center driving axle with screw, displacement conversion
Measurement drawstring on device is connected with measured object, and the torque spring on center driving axle can realize displacement transducer
Return function, when measurement drawstring is subjected to displacement change, can drive displacement converter device and center driving axle, cause cantilever beam certainly
By the change in displacement held, by the difference of the center wavelength variation of detection light fiber Bragg grating, it is possible to draw the position of measured object
Shifting amount.Displacement converter device adopts easy-to-mount design, can be in the case where displacement transducer overall structure is not changed, side
Just the range of displacement transducer is adjusted.Elastic component is the torque spring being sleeved on center driving axle, passes can center
Moving axis returns to initial position after rotating.Center driving axle is fixed using two bearings, and center driving axle can be made to keep water
It is flat, and reduce the friction that center driving axle is produced in rotary course.
Dragline type wide-range fiber grating displacement sensor includes optical fiber Bragg raster 1a and 1b, cantilever beam 2, steel wire rope
3rd, screw I 4, center driving axle 5, rolling bearing I 6, rolling bearing II 7, torque spring 8, screw II 9, displacement converter device 10,
Measurement drawstring 11, can 12, external optical fiber 13.The optical fiber Bragg raster 1a and 1b of two different centre wavelengths symmetrically pastes
In the both sides of cantilever beam 2, being cascaded to be connected with external optical fiber 13 is drawn out to outside casing.Cantilever beam 2 is fixed on can 12
On, its free end is connected by steel wire rope 3 with center driving axle 5, and center driving axle 5 is arranged between bearing I 6 and bearing II 7,
The return function of displacement transducer can be realized by the torque spring 8 installed additional on center driving axle 5, screw II 9 turns displacement
Changing device 10 is fixed on center driving axle 5.Can 12 seals the sensing element such as optical fiber Bragg raster 1a and 1b, cantilever beam 2
Inside is mounted in, to reduce the impact that external environment is caused to it.When extraneous displacement changes, measurement drawstring 11 drives displacement
With center driving axle 5 with the rotation of identical angular velocity, center driving axle 5 causes cantilever beam 2 certainly to conversion equipment 10 by steel wire rope 3
Changed by end movement so that be pasted onto the two optical fiber Bragg rasters 1a and 1b difference under tension and pressure of the both sides of cantilever beam 2
Effect, cause the centre wavelength of the two to move round about, by demodulate optical fiber Bragg raster centre wavelength, to it
Relation between difference and measurement displacement is demarcated, and realizes the measurement to measured object displacement.Mathematics of the present utility model
Model analysiss are as follows：
The deformation of cantilever beam causes the deformation of optical fiber Bragg raster, and the temperature change in measurement process is Δ T, is obtained
The centre wavelength displacement of the optical fiber Bragg raster that strain and temperature cause is Δ λB, by the sensing principle of optical fiber Bragg raster
Following expression can be obtained：
In formula, Kε=1-P, P for fiber grating elasto-optical coefficient, the temperature and emergent property of two optical fiber Bragg rasters
Identical Kε1=Kε2, KT1=KT2, because optical fiber Bragg raster is distributed in cantilever beam both sides, residing temperature environment is identical, stress side
To conversely, ε can be obtained1=-ε2, Δ T1=Δ T2, two formulas are subtracted each other：
From above formula, the center wavelength variation amount and cantilever beam of the optical fiber Bragg raster of cantilever beam both sides are pasted onto
Deformation it is relevant, and both are linear.
Cantilever beam be the triangular-section beam of uniform strength as shown in figure 3, when power F acts on free end, equi intensity cantilever
Strain at a certain position in surface can be calculated according to formula (4)：
In formula, ε be apart from the strain size that fixing end is x places, L for cantilever beam length, h is the thickness of cantilever beam, and A is
The sectional area of cantilever beam, E is the elastic modelling quantity of cantilever material.
The width of cantilever beam fixing end is b0, apart from fixing end be x place cantilever beam width be bx, cantilever beam herein can be obtained
Sectional area AxFor
Bring formula (5) into (4) strain of cantilever beam can be obtained and be
The amount of deflection of equi intensity cantilever free end is
Bringing formula (7) into (6) can obtain the surface strain computing formula of cantilever beam
When drawstring drive displacement converter device rotation is measured, due to the angular displacement of displacement converter device and center driving axle
It is identical, according to center driving axle radius r1With displacement converter device radius r2Displacement X can be obtained is with the relation of amount of deflection ω
Formula (8) (9) is brought in formula (3) and can be obtained
From formula (10), the size, center driving axle radius r when cantilever beam1With displacement converter device radius r2Etc. parameter
When fixed, the center wavelength variation of optical fiber Bragg raster is linear with the displacement X of measurement drawstring, shows by measurement
The wavelength shift of optical fiber Bragg raster can calculate the displacement measured by displacement transducer.
The beneficial effects of the utility model are：
1. simple structure.Using optical fiber Bragg raster, cantilever beam as sensing element, measurement drawstring drives center driving axle
Cause free end travel to change, displacement is realized by the wavelength change of the different optical fiber Bragg raster of two centre wavelengths of detection
Monitoring, with low manufacture cost, the characteristics of easy to use.
2. range is adjustable.Cantilever beam, optical fiber Bragg raster, bearing etc. are encapsulated in inside can.Displacement converter device
It is arranged on outside can with center driving axle, is fixed the two using screw.Adjust when the range to displacement transducer is needed
When whole, can be in the case where can not be taken apart, the displacement converter device outside replacing, by calculating different displacement converting means
Put the proportionate relationship between diameter, it is possible to achieve the measurement of different range displacements.
3. strong antijamming capability.Using optical fiber Bragg raster as sensing element, transmission signal is optical signal, Ke Yikang
Electromagnetic interference, while avoiding the generation of electric spark, reduces potential safety hazard.
4. the on-line monitoring of displacement is realized.Sensor becomes the displacement that displacement to be measured is converted into cantilever beam free end
Change so that the centre wavelength for being pasted onto the optical fiber Bragg raster of cantilever beam both sides is drifted about, by detection fiber Bragg light
The center wavelength variation of grid can calculate the size of external displacement amount, realize on-line real time monitoring.
Description of the drawings
Fig. 1 is structure schematic top plan view of the present utility model；
Fig. 2 is structure left view schematic diagram of the present utility model；
Fig. 3 is equi intensity cantilever structural representation of the present utility model；
Figure acceptance of the bid shows parts, toponym and correspondence label：1a, 1b are symmetrical two fiber Braggs pasted
Grating, 2 be cantilever beam, 3 be steel wire rope, 4 be screw I, 5 centered on power transmission shaft, 6 be bearing I, 7 be bearing II, 8 be torsion bullet
Spring, 9 be screw II, 10 be displacement converter device, 11 for measurement drawstring, 12 be can, 13 be external optical fiber.
Specific embodiment
With reference to Fig. 1, this utility model is a kind of dragline type wide-range displacement transducer, including cantilever beam, is symmetrically pasted onto
The optical fiber Bragg raster of the different centre wavelengths of two of cantilever beam both sides, is fixed on two bearings of can inwall, is arranged on
Center driving axle between two bearings, center driving axle is connected by steel wire rope with the free end of cantilever beam, will using screw
Displacement converter device is fixed on center driving axle, and having installed torque spring on center driving axle additional occurs can center driving axle
After rotation, initial position is returned to.When measured object displacement changes, measurement drawstring drives center to pass by displacement converter device
Moving axis rotation causes cantilever beam free end travel to change, and changes the centre wavelength of optical fiber Bragg raster, two fiber Bragg light
Grid concatenation is connected on spectrum analyses (FBG) demodulator through external optical fiber, by the center wavelength variation for detecting two gratings, can
To obtain the change in displacement of measured object.
Measurement drawstring is the sensing part being connected with measured object, is wrapped on displacement converter device, for the ease of adjustment
The range of displacement transducer, displacement converter device adopts the mode being screwed, and can easily be dismounted.Elastic component is
The torque spring being sleeved on center driving axle, after rotating can center driving axle, returns to initial position.
Specific embodiment of the present utility model is elaborated above in conjunction with accompanying drawing, but this utility model is not limited
In above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, can be with new without departing from this practicality
Make a variety of changes on the premise of type.
Claims (4)
1. a kind of dragline type wide-range fiber grating displacement sensor, it is characterised in that the sensor include optical fiber Bragg raster,
Cantilever beam, bearing, center driving axle, torque spring, displacement converter device, screw, external optical fiber, steel wire rope, can；Wherein
Two Double fiber Bragg gratings of different centre wavelengths claim to be pasted onto the both sides of cantilever beam, and center driving axle is arranged on two axles
It is fixed between holding on the inwall of can, it is connected with the free end of cantilever beam by steel wire rope；Displacement is turned with screw
Changing device is fixed with center driving axle, and the measurement drawstring on displacement converter device is connected with measured object；When measurement drawstring occurs position
When moving change, displacement converter device and center driving axle can be driven, cause the change in displacement of cantilever beam free end, it is viscous by detection
It is attached to the center wavelength variation of the optical fiber Bragg raster of cantilever beam both sides, it is possible to draw the displacement of measured object.
2. a kind of dragline type wide-range fiber grating displacement sensor according to claim 1, it is characterised in that displacement turns
Changing device adopts easy-to-mount design, can easily adjust position in the case where displacement transducer overall structure is not changed
The range of displacement sensor.
3. a kind of dragline type wide-range fiber grating displacement sensor according to claim 1, it is characterised in that elastic structure
Part is the torque spring being sleeved on center driving axle, and center driving axle can be made to return to initial position after rotating.
4. a kind of dragline type wide-range fiber grating displacement sensor according to claim 1, it is characterised in that center passes
Moving axis is fixed using two bearings, can make center driving axle holding level, and reduce center driving axle to produce in rotary course
Raw friction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621052415.4U CN206146385U (en) | 2016-09-13 | 2016-09-13 | Stay cord formula wide -range fiber grating displacement sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621052415.4U CN206146385U (en) | 2016-09-13 | 2016-09-13 | Stay cord formula wide -range fiber grating displacement sensor |
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| Publication Number | Publication Date |
|---|---|
| CN206146385U true CN206146385U (en) | 2017-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621052415.4U Expired - Fee Related CN206146385U (en) | 2016-09-13 | 2016-09-13 | Stay cord formula wide -range fiber grating displacement sensor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108107253A (en) * | 2017-12-27 | 2018-06-01 | 盐城工学院 | It is a kind of to have from the fiber gratings of temperature characteristics is straight, ac sensor |
| CN108801166A (en) * | 2018-05-29 | 2018-11-13 | 北京航空航天大学 | Fiber grating wing distortion measurement modeling based on cantilever beam theory and scaling method |
| CN111895918A (en) * | 2020-08-28 | 2020-11-06 | 哈尔滨工业大学 | Multipoint serial distributed optical fiber displacement sensor and measuring system thereof |
| CN114046722A (en) * | 2021-10-12 | 2022-02-15 | 中车唐山机车车辆有限公司 | Displacement meter |
| CN114087971A (en) * | 2021-11-23 | 2022-02-25 | 韩泽旭 | Stay wire displacement sensor |
| CN115574724A (en) * | 2022-11-15 | 2023-01-06 | 西南交通大学 | Railway turnout movable steel rail displacement monitoring device, monitoring method and evaluation method |
-
2016
- 2016-09-13 CN CN201621052415.4U patent/CN206146385U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108107253A (en) * | 2017-12-27 | 2018-06-01 | 盐城工学院 | It is a kind of to have from the fiber gratings of temperature characteristics is straight, ac sensor |
| CN108107253B (en) * | 2017-12-27 | 2023-09-08 | 盐城工学院 | Fiber bragg grating direct-current and alternating-current sensor with self-temperature characteristic |
| CN108801166A (en) * | 2018-05-29 | 2018-11-13 | 北京航空航天大学 | Fiber grating wing distortion measurement modeling based on cantilever beam theory and scaling method |
| CN108801166B (en) * | 2018-05-29 | 2020-05-26 | 北京航空航天大学 | Fiber bragg grating wing deformation measurement modeling and calibration method based on cantilever beam theory |
| CN111895918A (en) * | 2020-08-28 | 2020-11-06 | 哈尔滨工业大学 | Multipoint serial distributed optical fiber displacement sensor and measuring system thereof |
| CN111895918B (en) * | 2020-08-28 | 2021-06-15 | 哈尔滨工业大学 | Multipoint serial distributed optical fiber displacement sensor and measuring system thereof |
| CN114046722A (en) * | 2021-10-12 | 2022-02-15 | 中车唐山机车车辆有限公司 | Displacement meter |
| CN114087971A (en) * | 2021-11-23 | 2022-02-25 | 韩泽旭 | Stay wire displacement sensor |
| CN115574724A (en) * | 2022-11-15 | 2023-01-06 | 西南交通大学 | Railway turnout movable steel rail displacement monitoring device, monitoring method and evaluation method |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170503 Termination date: 20170913 |
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| CF01 | Termination of patent right due to non-payment of annual fee |