CN104764438B - Distinguishable circumference deviational survey sensor based on fiber grating - Google Patents
Distinguishable circumference deviational survey sensor based on fiber grating Download PDFInfo
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- CN104764438B CN104764438B CN201510203232.1A CN201510203232A CN104764438B CN 104764438 B CN104764438 B CN 104764438B CN 201510203232 A CN201510203232 A CN 201510203232A CN 104764438 B CN104764438 B CN 104764438B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
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Abstract
The invention discloses the distinguishable circumference deviational survey sensor based on fiber grating; including sensor outer housing; it is provided with two pairs of fixtures in described sensor outer housing; each pair fixture is used for fixing a corresponding equi intensity cantilever; two equi intensity cantilevers are spatially mutually perpendicular to but do not contact; each equi intensity cantilever bottom is pasted with mass, and two optical fiber pigtails are drawn from sensor outer housing top, are connected with (FBG) demodulator after being inserted in hollow protection pipe；Spatially orthogonal two equi intensity cantilevers, produce deformation in sensor perturbations to record the angle of inclination in z-axis direction for the sensor, simultaneously, by being mapped to the displacement on x/y plane during equi intensity cantilever deformation, record the incline direction on x/y plane, thus realizing the natural measurement of tilt of distinguishable circumference.Accurately, structure is simple for present invention measurement.
Description
Technical field
The present invention relates to technical field of optical fiber sensing, particularly to a kind of fiber-optic grating sensor of distinguishable circumference deviational survey.
Background technology
Since the nineties in 20th century, it has not been subject to electromagnetic interference influence due to having, size is little, lightweight, long service life
The advantages of, fiber grating sensing technology quickly grows.Traditional portable, fixed deviational survey sensor has been widely used for respectively
Plant in the monitoring of gradient in engineering, as F.A.Tavenas proposes application inclinometer detection embankment weak soil in Geotechnical Engineering
Lateral deformation；Wang Chunxiao adopts the three axle normal acceleration sensor measurement orthogonal Magnetic sensors of terrestrial gravitation vector three axle to survey
Measure geomagnetic fieldvector to measure gradient.But there is larger deficiency in traditional deviational survey sensor, such as data acquisition instrument occurs drift
Shift error, the abrasion of inclinometer guide wheel, skew etc. can bring error etc..Fiber grating sensing technology is as the new rank of sensing technology
Section, it meets the high accuracy of measurement, remote and chronicity requirement, provides good technology for solving above-mentioned key issue
Means.Therefore fiber grating deviational survey sensor is just progressively being applied in various engineerings.Flexure theory as Pei Hua Futong lintel is public
Formula and difference algorithm, try to achieve original position inclinometer according to the linear relationship between Fiber Bragg Grating FBG wavelength change and strain and respectively survey
The change to try to achieve its gradient for the strain of point.But the research with regard to the fiber-optic grating sensor of distinguishable circumference deviational survey and application are seldom
Report.
Content of the invention
For solving the deficiency that prior art exists, the invention discloses the distinguishable circumference deviational survey sensing based on fiber grating
Device, the present invention records the angle of inclination by the relation of the strain of equi intensity cantilever when tilting and fiber bragg grating center wavelength change
Degree, because sensor internal has two to be mutually perpendicular to but discontiguous equi intensity cantilever, can be asked with utilization space vector method
The direction that must tilt.
For achieving the above object, the concrete scheme of the present invention is as follows：
Based on the distinguishable circumference deviational survey sensor of fiber grating, including sensor outer housing, setting in described sensor outer housing
There are two pairs of fixtures, each pair fixture is used for fixing a corresponding equi intensity cantilever, and two equi intensity cantilevers are in space
On be mutually perpendicular to but do not contact, each equi intensity cantilever bottom is pasted with mass, and two optical fiber pigtails are from sensor outer housing
Top is drawn, and is connected with (FBG) demodulator after being inserted in hollow protection pipe；
Spatially orthogonal two equi intensity cantilevers, produce deformation and are existed with recording sensor in sensor perturbations
The angle of inclination in z-axis direction, meanwhile, by being mapped to the displacement on x/y plane during equi intensity cantilever deformation, records and puts down in xy
Incline direction on face, thus realize the natural measurement of tilt of distinguishable circumference.
Wherein one optical fiber pigtail is connected with corresponding sensitivity grating, sensitive grating be pasted onto inwall on sensor outer housing
On temperature-compensating grating be connected, another optical fiber pigtail is connected with corresponding sensitivity grating, and sensitive grating is respectively adhered on respectively
On self-corresponding equi intensity cantilever.
Described sensor outer housing is cylinder, and sensor outer housing upper end is provided with the sensor being matched therewith using
Lid, sensor outer housing lower end is provided with the sensor base being matched therewith using, and on sensor, tops have screw thread mouth with reality
The extraction of existing optical fiber pigtail.
Described each pair fixture all includes the first fixture and the second fixture, and the first fixture and the second fixture are two
The unequal cuboid block of individual size, both the first fixture and the second fixture are high equal, but the first fixture wide with the
The length of two fixtures is equal, and the first fixture is screwed lid inwall top on sensor.
Described second fixture is screwed in the first fixture side, presss from both sides between the first fixture and the second fixture
There is equi intensity cantilever.
It is provided with hole in the middle of described first fixture and the screw thread mouth with tops on sensor communicates, be pasted on equal strength and hang
The optical fiber pigtail of the sensitive grating on arm beam surface is drawn by this hole.
Described equi intensity cantilever, selects carbon fiber board as matrix, for ensureing the generation homogeneous deformation of its uniform force,
Equi intensity cantilever is set to isosceles triangle in effective field of load.
Described mass, material is chosen as copper, cylindrically shaped, is affixed to equi intensity cantilever bottom, uses
In generation active force.
Described sensitive grating, with ethyl α-cyanoacrylate, grid region is pasted on equi intensity cantilever.
Described temperature-compensating grating, with ethyl α-cyanoacrylate, grid region is pasted on sensor outer housing inwall, with
Sensitive gratings in series.
When sensor tilts so that two equi intensity cantilevers is all deformed upon to a direction, if θ is one of
The angle that equi intensity cantilever tilts,The angle tilting for another equi intensity cantilever, φ is sensor in vertical direction
Angle of inclination；
Wherein, F is external forces, and l is the length of cantilever beam；b0Width for fixing end；H is the thickness of cantilever beam；E is
The elastic modelling quantity of cantilever beam, λBFor grating wavelength, Δ λBFor grating wavelength change.
Known by above formula, θ,Can be drawn by wavelength parsing, can be considered known quantity；
Set up XYZ coordinate system, X ' Y ' Z ' is the coordinate system after sensor perturbations；
With Z-direction angle after sensor perturbations, during solution：
OrderCan try to achieve after inclinationThen,
So, try to achieve after sensor perturbations with Z-direction angle
It is mapped on X/Y plane, if the direction tilting and X-axis positive direction angle are α, order
Then,
So, try to achieve incline direction and the X-axis positive direction angle of sensor：
Beneficial effects of the present invention：
Accurately, structure is simple for present invention measurement.Distinguishable circumference deviational survey sensor based on fiber grating of the present invention,
Using fiber grating as core sensing element, orthogonal two equi intensity cantilevers in utilization space, in sensor perturbations
When produce deformation to record the angle of inclination in z-axis direction for the sensor, meanwhile, be mapped to xy by during equi intensity cantilever deformation
Displacement in plane, records the incline direction on x/y plane, thus realizing the natural measurement of tilt of distinguishable circumference.
Brief description
Fig. 1 is the schematic appearance of distinguishable circumference deviational survey sensor；
Fig. 2 is distinguishable circumference deviational survey sensor internal structure chart；
Fig. 3 is equi intensity cantilever schematic diagram；
Fig. 4 is sensor outer housing schematic diagram；
Fig. 5 is sensor base schematic diagram；
Fig. 6 is lid schematic diagram on sensor；
Fig. 7 is mass schematic diagram；
Fig. 8 is the first fixture schematic diagram；
Fig. 9 is the second fixture schematic diagram；
Figure 10 a equi intensity cantilever accepts model primitive front view；
Figure 10 b equi intensity cantilever accepts model primitive side view；
It is θ state front view that Figure 11 a equi intensity cantilever accepts model inclination angle；
It is θ side view of the state that Figure 11 b equi intensity cantilever accepts model inclination angle；
Figure 12 XYZ coordinate system schematic diagram；
In figure：1 optical fiber pigtail, 2 sensor outer housings, 3 sensors cover, 4 sensor base,
5 second fixtures, 6 equi intensity cantilevers, 7 masses, 8 first fixtures, 9 be pasted on etc. strong
Sensitive grating on degree cantilever beam, 10 temperature-compensating gratings.
Specific embodiment：
The present invention is described in detail below in conjunction with the accompanying drawings：
Schematic appearance such as Fig. 1-6 institute of the distinguishable circumference deviational survey sensor based on fiber grating involved in the present invention
Show.This sensor mainly includes sensor outer housing 2, interior fixtures include the first fixture 8 and the second fixture 5, equal strength
Lid 3 and sensor base 4 on cantilever beam 6, mass 7, sensitive grating 9, temperature-compensating grating 10, sensor.Outside sensor
Fix two equi intensity cantilevers 6 with two interior fixtures respectively in shell 2, two equi intensity cantilevers 6 are stained with respectively quick
Photosensitive grid 9, and bottom is respectively provided with mass 7, temperature-compensating grating 10 is pasted on equi intensity cantilever with one of them
It is pasted on the inwall of sensor outer housing 2, two optical fiber pigtails 1 are drawn from transducer tip, are inserted in hollow after sensitive grating 9 series connection
It is connected with (FBG) demodulator after protection pipe.
Sensor outer housing 2 is cylinder, and material is 304 rustless steels, and there is screw thread mouth at top to realize drawing of optical fiber pigtail 1
Go out.
As Figure 8-9, interior fixtures divide two parts, and every partial interior fixture is small one and large one two cuboids
Block, each fixes an equi intensity cantilever 6.Two equi intensity cantilevers 6, are spatially mutually perpendicular to but do not contact.
As shown in fig. 7, mass 7, material is chosen as copper, cylindrically shaped, is affixed to equi intensity cantilever 6 bottom
End, for producing active force.Equi intensity cantilever 6 for producing strain selects carbon fiber board as matrix, from alpha-cyano
Ethyl acrylate is as the binding agent of fiber grating and equi intensity cantilever 6.For ensureing the generation homogeneous deformation of its uniform force, etc.
Intensity cantilever beam 6 is designed as isosceles triangle in effective field of load.For producing the mass 7 of active force, material selects
For copper, cylindrically shaped, it is affixed to equi intensity cantilever 6 bottom.
Sensor measuring principle is further described below：When sensor run-off the straight, vertical equi intensity cantilever 6 meeting exists
Producing in the presence of mass 7, thus deforming upon, and then changing the centre wavelength of fiber grating.By fiber optic wavelength
The change of demodulated equipment demodulating fiber bragg grating centre wavelength, records the angle that corresponding equi intensity cantilever 6 tilts.Equal strength cantilever
Relational expression between beam 6 surface strain ε and external forces F：
In formula, the length of l cantilever beam；b0The width of fixing end；The thickness of h cantilever beam；The elastic modelling quantity of E cantilever beam.
Grating wavelength changes：
ΔλB=0.78* ε * λB
Cantilever beam stress model original state is as shown in Figure 10 a-10b it is assumed that inclination angle is the stress model of θ then cantilever beam
As shown in Figure 11 a-11b, the stress model of cantilever beam is：
FTangentially=F sin θ (2)
Relation therefore between wavelength and angle of inclination is：
When sensor tilts so that two equi intensity cantilevers 6 is all deformed upon to a direction, if θ is one of
The angle that equi intensity cantilever tilts,The angle tilting for another equi intensity cantilever, φ is sensor in vertical direction
Angle of inclination.Known by formula (3), θ,Can be drawn by wavelength parsing, can be considered known quantity.Set up the XYZ being illustrated in fig. 12 shown below
Coordinate system, X ' Y ' Z ' is the coordinate system after sensor perturbations.
OrderCan try to achieve after inclinationThen,
So, try to achieve after sensor perturbations with Z-direction angleIt is mapped to
On X/Y plane, if the direction tilting and X-axis positive direction angle are α, order
Then,
So, try to achieve incline direction and the X-axis positive direction angle of sensor
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not model is protected to the present invention
The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme, and those skilled in the art are not
Need to pay the various modifications that creative work can make or deformation still within protection scope of the present invention.
Claims (10)
1. the distinguishable circumference deviational survey sensor based on fiber grating, including sensor outer housing, cantilever beam and mass, its feature
It is in described sensor outer housing, to be provided with two pairs of fixtures, each pair fixture is used for fixing a corresponding equi intensity cantilever,
Two equi intensity cantilevers are spatially mutually perpendicular to but do not contact, and each equi intensity cantilever bottom is pasted with mass, and two
Root optical fiber pigtail is drawn from sensor outer housing top, is connected with (FBG) demodulator after being inserted in hollow protection pipe；
Spatially orthogonal two equi intensity cantilevers, produce deformation to record sensor in z-axis in sensor perturbations
The angle of inclination in direction, by being mapped to the displacement on x/y plane during equi intensity cantilever deformation, records on x/y plane meanwhile
Incline direction, thus realize distinguishable circumference natural measurement of tilt.
2. the distinguishable circumference deviational survey sensor based on fiber grating as claimed in claim 1, is characterized in that, wherein one optical fiber
Tail optical fiber is connected with corresponding sensitivity grating, sensitive grating and the temperature-compensating grating phase being pasted onto on inwall on sensor outer housing
Even, another optical fiber pigtail is connected with corresponding sensitivity grating, and sensitive grating is respectively adhered on each self-corresponding equal strength cantilever
Liang Shang.
3. the distinguishable circumference deviational survey sensor based on fiber grating as claimed in claim 1, is characterized in that, outside described sensor
Shell is cylinder, and sensor outer housing upper end is provided with to be covered on the sensor being matched therewith using, and sensor outer housing lower end is arranged
There is the sensor base being matched therewith using, on sensor, tops have screw thread mouth to realize the extraction of optical fiber pigtail.
4. the distinguishable circumference deviational survey sensor based on fiber grating as claimed in claim 1, is characterized in that, described each pair is fixed
Part all includes the first fixture and the second fixture, and the first fixture and the second fixture are the unequal cuboid of two sizes
Both block, the first fixture and the second fixture are high equal, but the wide length with the second fixture of the first fixture is equal, and first
Fixture is screwed lid inwall top on sensor.
5. the distinguishable circumference deviational survey sensor based on fiber grating as claimed in claim 4, is characterized in that, described second is fixing
Part is screwed in the first fixture side, accompanies equi intensity cantilever between the first fixture and the second fixture；
It is provided with hole in the middle of described first fixture and the screw thread mouth with tops on sensor communicates, be pasted on equi intensity cantilever
The optical fiber pigtail of the sensitive grating on surface is drawn by this hole.
6. the distinguishable circumference deviational survey sensor based on fiber grating as described in claim 1 or 5, is characterized in that, described etc.
Intensity cantilever beam, selects carbon fiber board as matrix, for ensureing the generation homogeneous deformation of its uniform force, equi intensity cantilever is having
It is set to isosceles triangle in effect field of load.
7. the distinguishable circumference deviational survey sensor based on fiber grating as claimed in claim 1, is characterized in that, described quality
Block, material is chosen as copper, cylindrically shaped, is affixed to equi intensity cantilever bottom, for producing active force.
8. the distinguishable circumference deviational survey sensor based on fiber grating as claimed in claim 2, is characterized in that, described sensitivity light
Grid, with ethyl α-cyanoacrylate, grid region are pasted on equi intensity cantilever；
Described temperature-compensating grating, with ethyl α-cyanoacrylate, grid region is pasted on sensor outer housing inwall, with sensitive light
Grid are connected.
9. the distinguishable circumference deviational survey sensor based on fiber grating as claimed in claim 1, is characterized in that, when sensor is to certain
When one direction tilts so that two equi intensity cantilevers is all deformed upon, if θ is the angle that one of equi intensity cantilever tilts
Degree,The angle tilting for another equi intensity cantilever, φ is sensor at the angle of inclination of vertical direction；
Wherein, F is external forces, and l is the length of cantilever beam；b0Width for fixing end；H is the thickness of cantilever beam；E is cantilever
The elastic modelling quantity of beam, λBFor grating wavelength, Δ λBFor grating wavelength change, known by above formula, θ,Can be drawn by wavelength parsing.
10. the distinguishable circumference deviational survey sensor based on fiber grating as claimed in claim 9, is characterized in that, set up XYZ coordinate
System, X ' Y ' Z ' is the coordinate system after sensor perturbations；
With Z-direction angle after sensor perturbations, during solution：
OrderCan try to achieve after inclinationThen,
So, try to achieve after sensor perturbations with Z-direction angle
It is mapped on X/Y plane, if the direction tilting and X-axis positive direction angle are α, order
Then,
So, try to achieve incline direction and the X-axis positive direction angle of sensor：
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510203232.1A CN104764438B (en) | 2015-04-23 | 2015-04-23 | Distinguishable circumference deviational survey sensor based on fiber grating |
| PCT/CN2016/079823 WO2016169485A1 (en) | 2015-04-23 | 2016-04-21 | Circumferentially-identifiable inclinometer sensor based on fiber grating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510203232.1A CN104764438B (en) | 2015-04-23 | 2015-04-23 | Distinguishable circumference deviational survey sensor based on fiber grating |
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| CN104764438A CN104764438A (en) | 2015-07-08 |
| CN104764438B true CN104764438B (en) | 2017-03-01 |
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| CN104764438B (en) * | 2015-04-23 | 2017-03-01 | 山东大学 | Distinguishable circumference deviational survey sensor based on fiber grating |
| CN104990513B (en) * | 2015-07-23 | 2017-08-11 | 福州大学 | One kind is applied to the inclined long term monitoring methods of historic building structure cylinder |
| CN105180900B (en) * | 2015-08-28 | 2018-01-02 | 中国科学院半导体研究所 | A kind of slant optical fiber instrument |
| CN105953751A (en) * | 2016-06-23 | 2016-09-21 | 武汉科技大学 | Distributed deformation measurement apparatus and method, fiber grating inclination angle sensor, and fiber grating inclination angle sensor structure |
| CN106840013A (en) * | 2016-12-29 | 2017-06-13 | 北京希卓信息技术有限公司 | Sliding monitoring sensor and Slope Sliding strain monitoring system |
| CN106643655B (en) * | 2017-03-06 | 2023-07-14 | 沈阳建筑大学 | Gravity type fiber bragg grating inclination sensor |
| CN106996819A (en) * | 2017-04-12 | 2017-08-01 | 东北大学 | A kind of multistage weighing sensor of the fiber grating based on Telescopic rod structure |
| CN107907921B (en) * | 2017-12-27 | 2024-05-24 | 盐城工学院 | Double-turndown funnel type fiber bragg grating rainfall sensor with temperature self-compensation characteristic |
| CN108036769A (en) * | 2018-01-11 | 2018-05-15 | 盐城工学院 | A kind of distinguishable direction from temperature compensation fiber grating deviational survey sensor |
| CN110274662B (en) * | 2018-03-13 | 2024-05-14 | 中国石油化工股份有限公司 | Floating plate state monitoring and sensing system |
| CN110274576B (en) * | 2018-03-13 | 2021-04-30 | 中国石油化工股份有限公司 | Floating disc inclination angle calculation and measurement method and system for floating roof storage tank and application |
| CN108519065A (en) * | 2018-04-18 | 2018-09-11 | 红云红河烟草(集团)有限责任公司 | Differential optical fiber Bragg grating tilt angle sensor and application method thereof |
| CN108917656B (en) * | 2018-07-24 | 2024-05-17 | 蚌埠学院 | Double-shaft fiber bragg grating inclination sensor |
| CN110118539B (en) * | 2019-05-24 | 2021-04-16 | 西南交通大学 | Optical fiber tilt angle sensor and method for overcoming temperature interference |
| CN110196040B (en) * | 2019-06-17 | 2021-10-08 | 福建博海工程技术有限公司 | Building inclination monitoring device and monitoring method thereof |
| CN110595395A (en) * | 2019-10-25 | 2019-12-20 | 石家庄铁道大学 | Optical fiber grating inclinometer |
| CN110567402A (en) * | 2019-10-25 | 2019-12-13 | 石家庄铁道大学 | Optical fiber grating inclinometer |
| CN110793675B (en) * | 2019-11-19 | 2024-05-03 | 大连理工大学 | Fiber bragg grating soil pressure sensor |
| CN112229345B (en) * | 2020-10-15 | 2021-07-06 | 武汉科技大学 | Optical fiber grating inclination sensor free of vibration influence |
| CN113074760B (en) * | 2021-03-31 | 2022-07-19 | 西安石油大学 | Micro-strain fiber grating sensor, stress measurement system and working method thereof |
| CN113310461B (en) * | 2021-04-23 | 2023-02-17 | 中铁第一勘察设计院集团有限公司 | Temperature insensitive optical fiber two-dimensional tilt angle sensor |
| CN114353686B (en) * | 2021-09-10 | 2023-10-20 | 重庆交通大学 | Intelligent obtaining method and related device for curvature distribution of tunnel lining |
| CN114087971A (en) * | 2021-11-23 | 2022-02-25 | 韩泽旭 | Stay wire displacement sensor |
| CN115615395B (en) * | 2022-11-18 | 2023-03-28 | 山东科技大学 | Fiber grating goaf overlying strata inclinometer and measurement method thereof |
| CN115638749A (en) * | 2022-12-21 | 2023-01-24 | 北京精诚恒创科技有限公司 | Two-dimensional tilt angle sensor based on fiber bragg grating and tilt angle measuring method |
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| TWI250326B (en) * | 2003-11-28 | 2006-03-01 | Prime Optical Fiber Corp | Optical fiber inclinometer |
| KR100571294B1 (en) * | 2004-04-02 | 2006-04-17 | 이금석 | Angle measurement method using fiber optic sensor |
| CN1304822C (en) * | 2004-10-29 | 2007-03-14 | 清华大学 | Optical fiber grating inclination angle sensor |
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| CN101603827A (en) * | 2009-03-26 | 2009-12-16 | 中国计量学院 | Novel fiber grating two-dimensional tilting angle sensor |
| CN201688838U (en) * | 2010-06-08 | 2010-12-29 | 中国计量学院 | Temperature insensitive type fiber grating tilt sensor |
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| CN104764438B (en) * | 2015-04-23 | 2017-03-01 | 山东大学 | Distinguishable circumference deviational survey sensor based on fiber grating |
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2015
- 2015-04-23 CN CN201510203232.1A patent/CN104764438B/en active Active
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- 2016-04-21 WO PCT/CN2016/079823 patent/WO2016169485A1/en active Application Filing
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| WO2016169485A1 (en) | 2016-10-27 |
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