CN105841619A - Wide range fiber grating displacement sensor capable of adjusting measuring range and precision - Google Patents
Wide range fiber grating displacement sensor capable of adjusting measuring range and precision Download PDFInfo
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- CN105841619A CN105841619A CN201610159291.8A CN201610159291A CN105841619A CN 105841619 A CN105841619 A CN 105841619A CN 201610159291 A CN201610159291 A CN 201610159291A CN 105841619 A CN105841619 A CN 105841619A
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- fiber grating
- precision
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- gear
- wide range
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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
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
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- General Physics & Mathematics (AREA)
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- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a wide range fiber grating displacement sensor capable of adjusting a measuring range and precision, comprising fiber gratings, a spring and a rectangle housing; the adaptive position on the inner wall of the housing is fixedly connected to a support plate; the middle portion of the free end of the support plate is provided with a groove; the top end of the groove is provided with a sleeve sleeving a rotation shaft; an eccentric point of a gear passes through the middle portion of a rotation shaft and is integrated with the rotation shaft; the lower end of the gear is meshed with a spline fixed on a support rod on the lower part of the housing; one end of the spline is fixedly connected to the measurement rod; the measurement rod passes through and is projected out of the side wall of the adjacent housing and is in contact with a measured structure; the other end of the spline is connected to the side wall of the housing of the other end through a spring which is fixedly connected in parallel; and the two fiber gratings are symmetrically arranged on the upper surface and the lower surface of the support plate. The wide range fiber grating displacement sensor solves the problem that the current fiber grating displacement sensor is small in the measuring range, and is simple in operation, stable in performance, reliable, and high in accuracy and is the first choice for health monitoring of various construction structures.
Description
Technical field
The present invention relates to a kind of sensor, particularly relate to the wide range fiber grating of a kind of range-adjustable and precision
Displacement transducer, belongs to technical field of optical fiber sensing.
Background technology
With the sensor that fiber grating is basic test unit, there is volume electricity little, lightweight, corrosion-resistant, anti-
The plurality of advantages such as magnetic disturbance, have been widely used in the health monitoring of engineering structure the most.Wherein, answering
Become and two aspects of temperature are most to application and the research of fiber grating sensing technology, and displacement is supervised
Research in terms of survey and apply relatively fewer.Major part fiber grating displacement sensor is all based on cantilever beam knot
Structure design, this structure is that fiber grating is pasted onto cantilever beam surface, when cantilever beam free end stress produces
During displacement, the fiber grating being pasted onto cantilever beam surface strains, thus causes fiber grating reflection wavelength
Drift.The size of cantilever beam cantilever end displacement can be calculated by the size of wavelength shift, thus real
The measurement of existing displacement.Fiber grating is mainly made up of quartz, and material behavior determines that its maximum that can bear should
Change scope is generally 3000 to 5000 microstrains, which limits the optical fiber being directly translated into strain by displacement
The range of grating displacement sensor.Therefore the survey of the fiber grating displacement sensor of cantilever beam structure is directly utilized
Weight range is limited.Additionally, due to the fiber grating position after Nian Tieing is difficult to change, so by changing
The paste position of fiber grating changes the range of sensor and precision also is difficult to realize in practical operation.
Summary of the invention
The present invention is aiming at what the problems referred to above put forward, and purpose is just to provide a kind of solution existing fiber grating
Displacement sensor range is little, it is impossible to change range and the range-adjustable of precision problem and the wide range of precision
Fiber grating displacement sensor, and reach simple in construction, stable performance, reliable, precision height, it is suitable for various
The purpose of engineering structure health monitoring.
To achieve these goals, the present invention solves the technical scheme of technical problem and is:
A kind of wide range fiber grating displacement transducer of range-adjustable and precision, including: fiber grating, tooth
Wheel, tooth bar and the shell body of rectangle, the adapting position in its shell body medial wall is fixed with supporting plate, should
It is provided with groove in the middle part of the free end of supporting plate, and groove top is provided with the sleeve of package packing rotating shaft, the bias of gear
Point through in the middle part of rotating shaft and be connected as one, described gear lower end be fixed on shell body lower beams
Tooth bar is meshed, and one end of this tooth bar is connected with measuring bar, measures bar and passes and lean out adjacent shell side
Wall and tested form touch, the other end of this tooth bar is by the shell side of parallel connected spring with the other end
Wall is connected, and two fiber grating symmetries are located at the upper and lower surface of supporting plate.
Described tooth bar width is more than gear width.
The cross section of described tooth bar is more than the cross section measuring bar.
Described bar external diameter of measuring is less than the external diameter of the adjacent shells side cinclides passing with it and leaning out
2～5mm.
Described shell body is made up of corrosion resistant plate.
Owing to using said structure so that the present invention has following advantages and an effect:
Displacement transducer of the present invention mainly will treat that displacement changes into cantilever beam cantilever end by eccentric gear
Amount of deflection, and then cause the strain variation on cantilever beam, the strain variation of cantilever beam causes the light being pasted on beam
The drift of fine grating wavelength, can draw measured displacement size by optic fiber grating wavelength drift value.By bias
The purpose that can realize wide range fiber grating displacement transducer is reduced in displacement by gear.Gear is along being radially provided with
Different eccentric point, can according to concrete range and required precision eccentric adjustment away from thus realize range and precision
Switching, it is achieved the purpose of the optical fibre optical fibre displacement transducer of range-adjustable and precision.The present invention solves effectively
It is little that existing fiber grating displacement sensor of having determined measures range, it is impossible to changes range and precision problem, and operation
Simply, stable performance, reliable, precision height, be the first-selection of the health monitoring of various engineering structure.
Supporting plate of the present invention is the equal of cantilever beam, and the cantilever end at supporting plate connects one can around axle freely
The eccentric gear rotated, the tooth bar that eccentric gear is connected with measurement boom end is engaged.When tested displacement structure is sent out
Measure bar setting in motion during changing and drive eccentric gear to rotate.Owing to gear is off wheel, so gear
The cantilever end of supporting plate can be driven in rotation process to move, so that the fiber grating on cantilever beam produces
Raw strain, can calculate the displacement measuring bar, i.e. measured displacement value by the wavelength shift of fiber grating.
Fiber grating pair strain and variations in temperature are the most sensitive, and two fiber gratings of supporting plate upper and lower surface are in same
In one ambient temperature field, therefore the change by two optic fiber grating wavelengths caused by variations in temperature is equal
's.No matter supporting plate is upwards or to be bent downwardly, two fiber gratings always one experience normal strain, separately
Experience negative strain for one, and both absolute values are equal, temperature on fiber light lattice wave can be eliminated by computing
The impact of long drift so that displacement measurement is more accurate.
Accompanying drawing explanation
With detailed description of the invention, the present invention is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 is the main TV structure of wide range fiber grating displacement transducer of a kind of range-adjustable of the present invention and precision
Schematic diagram；
Fig. 2 is the I-I sectional structure schematic diagram of Fig. 1 of the present invention；
Fig. 3 is that the principle of the wide range fiber grating displacement transducer of a kind of range-adjustable of the present invention and precision is shown
It is intended to.
In figure: shell body 1, fiber grating 2, supporting plate 3, gear 4, by geodesic structure 5, measure bar 6,
Tooth bar 7, pole 8, spring 9, rotating shaft 10, cantilever beam free end amount of deflection Δ h 11, gear eccentricity away from r 12,
Pinion rotation angle [alpha] (0-π) 13, the arc length S 14 of pinion rotation, length L 15 of supporting plate, grating
Grid region and fixing distance x 16 held.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is further elaborated, but protection scope of the present invention
Do not limited by specific embodiment institute, be as the criterion with claims.It addition, with without prejudice to the technology of the present invention side
On the premise of case, any change that those of ordinary skill in the art made for the present invention easily realize or change
Within falling within scope of the presently claimed invention.
Embodiment 1
Fig. 1, a kind of range-adjustable and the wide range fiber grating displacement transducer of precision shown in 2, including:
The shell body of fiber grating, gear, tooth bar and rectangle, shell body 1 medial wall that its corrosion resistant plate is made
Adapting position be fixed with supporting plate 3, be provided with groove, and groove top in the middle part of the free end of this supporting plate 3
Being provided with the sleeve of package packing rotating shaft 10, eccentric point A of gear 4 passes in the middle part of rotating shaft 10 and is connected as one,
Described gear 4 lower end is meshed with the tooth bar 7 being fixed on shell body 1 lower beams 8, and tooth bar 7 is wide
Degree is more than gear 4 width, and one end of this tooth bar 7 is connected with measuring bar 6, and the cross section of tooth bar 7 is more than measuring
The cross section of bar 6, measures bar and passes and lean out adjacent shell body 1 areole, measure bar (6) external diameter little
In the external diameter 2～5mm of shell body (1) areole and contact with testee 5, the other end of this tooth bar 7
It is connected by bolt with shell body 1 sidewall of the other end by parallel connected spring 9, two fiber gratings
The 2 upper and lower surfaces being symmetrically set in supporting plate 3.
Embodiment 2
Fig. 1, a kind of range-adjustable and the wide range fiber grating displacement transducer of precision shown in 2, including:
The shell body of fiber grating, spring and rectangle, the adapting position of its shell body 1 medial wall is fixed with support
Plate 3, is provided with groove in the middle part of the free end of this supporting plate 3, and groove top is provided with the sleeve of package packing rotating shaft 10,
The eccentric point of gear 4 through in the middle part of rotating shaft 10 and be connected as one, described gear 4 lower end be fixed on
Tooth bar 7 on shell body 1 lower beams 8 is meshed, and one end of this tooth bar 7 is connected with measuring bar 6, surveys
Gauge rod passes and leans out adjacent shell body 1 sidewall and contacts with testee 5, and the other end of this tooth bar 7 leads to
Crossing parallel connected spring 9 to be connected with shell body 1 sidewall of the other end, two fiber gratings (2) are symmetrical
It is located at the upper and lower surface of supporting plate 3.
A kind of range-adjustable of the present invention and the operation principle of the wide range fiber grating displacement transducer of precision
As follows:
As it is shown on figure 3, cantilever beam free end amount of deflection Δ h 11, gear eccentricity is away from r 12, pinion rotation angle [alpha]
(0-π) 13, the arc length S 14 of pinion rotation, length L15 of supporting plate, grating grid region and fixing end
Distance x 16.
If it is x that fiber grating pastes the distance fixing end from supporting plate in position, supporting plate face is rectangle, the longest
Degree is L, and width is b, and thickness is h.Supporting plate cantilever end is in the amount of deflection driving lower carriage plate of eccentric gear
For Δ h, optic fiber grating wavelength drift value is Δ λB。
According to mechanics of materials formula: (M moment of flexure, F power, ω amount of deflection, I cross sectional moment of inertia, E
Elastic modelling quantity)
M (x)=-F (L-x) (1)
EI ω "=-M (x)+FL-Fx (2)
EI ω '=FLx-1/2Fx2+C1 (3)
EI ω=1/2FLx2-1/6Fx3+C1x+C2 (4)
Can be obtained by the boundary condition of supporting plate:
At x=0, ω=0, C2=0
At x=0, ω=θ=0, C1=0
ω=FLx2/2EI-FL3/6EI2 (5)
When free end, amount of deflection has a maximum:
I.e. during x=L,
ωm a x=FL3/3EI (6)
ωm a x=Δ h (7)
M=F (L-x)=3EII Δ h (L-x)/L3 (8)
The then strain stress at xxWith the relation of M it is: (σ stress, W bending sections coefficient)
εx=σ/E (9)
σ=M/W (10)
εx=3h Δ h (L-x)/2L3 (11)
When strain is εxTime, the wavelength shift of fiber grating is:
ΔλB/Kε=εx (12)
ΔλB=Kεεx (13)
ΔλB=3KεhΔh(L-x)/2L3 (14)
(KεFiber grating strain sensitivity coefficient)
When the displacement measuring bar generation Δ l is, wheel and rack is engaged, and rotates, tooth under the drive of tooth bar
The arc length that wheel rotates also is Δ l.If the angle of pinion rotation is α, gear diameter is D, and radius is R, tooth
Wheel axle center eccentric throw is r.Then have:
Δ l=α D=2 α R (15)
α=Δ l/2R (16)
Δ h=rsin α=rrsin (Δ l/2R) (17)
ΔλB=3Kεhr(L-x)sin(Δl/2R)/2L3 (18)
Formula (18) is optic fiber grating wavelength drift value Δ λBAnd reality measures the relation between bar measured displacement Δ l.
The effect of eccentric gear be shift value to be measured is reduced after change into the displacement of cantilever beam cantilever end, thus realize
The purpose of wide range fiber grating displacement transducer.Size by eccentric throw r of regulation gear can be the most square
Just realization is measured range and the expansion of precision and reduces.
When a kind of range-adjustable of the present invention and the wide range fiber grating displacement transducer of precision are specifically used:
Before displacement measurement starts, the spring 9 connecting tooth bar is in free state, measures bar 6 and all leans out
Outside the round hole of the shell body 1 that corrosion resistant plate is made.Eccentric point A of gear 4 is in minimum point,
Frame plate 3 is in level without strain regime, and the wavelength of fiber grating 2 is without drift.
When carrying out displacement measurement, the end measuring bar 6 contacts with by geodesic structure 5, then sends out whole
Bright sensor is fixed on not by the object by geodesic structure 5 Influence of Displacement.Caused by geodesic structure 5 change in displacement
Move together with measuring bar 6 extrusion spring 9 in the axial direction and driving the gear 4 being closely engaged with it, measure
The transform linear motion of bar 6 becomes the circular motion of gear 4.Owing to gear 4 is to do up time around eccentric point A to turn
Dynamic, along with the rotation of gear 4, supporting plate 3 free end has motion upwards also with A point and produces certain
Amount of deflection Δ h.Owing to supporting plate 3 is cantilever beam structure, the amount of deflection of free end can cause the change of strain on beam
Change, and then cause the drift of fiber grating 2 wavelength being pasted onto its upper and lower surface.Supporting plate 3 is bent up
Song, downside tension, upside pressurized, downside fiber grating experiences normal strain, and fiber grating impression in upside is negative should
Becoming, and both absolute values are equal, experience the optic fiber grating wavelength changing value of normal strain and experience negative strain
The difference of optic fiber grating wavelength changing value is the twice of the optic fiber grating wavelength changing value after getting rid of temperature impact.
And then the optic fiber grating wavelength drift value Δ λ that accurate change in displacement causes can be obtainedB.Pass through wave length shift
Value Δ λBRelational expression Δ λ with displacement lB=3Kεhr(L-x)sin(Δl/2R)/2L3Can draw and be surveyed
Shift value Δ l, it is achieved the measurement purpose of fiber grating displacement sensor.
After measurement terminates, measure bar under the elastic force effect of spring, recover initial position.
According to concrete precision and range, gear 4, along being radially provided with different eccentric point, can require that regulation is partially
The heart is away from r (changing the position of eccentric point A, the i.e. position of rotating shaft 10), it is achieved precision and the switching of range,
And it is simple to operate.
Claims (5)
1. a wide range fiber grating displacement transducer for range-adjustable and precision, including: fiber grating,
The shell body of gear, tooth bar and rectangle, it is characterised in that the adapting position of shell body (1) medial wall is solid
It is connected with supporting plate (3), is provided with groove in the middle part of the free end of this supporting plate (3), and groove top is provided with set
The sleeve of dress rotating shaft (10), the eccentric point of gear (4) is through rotating shaft (10) middle part and is connected as one,
Described gear (4) lower end is nibbled mutually with the tooth bar (7) being fixed on shell body (1) lower beams (8)
Closing, one end of this tooth bar (7) is connected with measuring bar (6), measures bar and passes and lean out adjacent shell body
(1) sidewall contacts with by geodesic structure (5), and the other end of this tooth bar (7) passes through parallel connected spring
(9) being connected with shell body (1) sidewall of the other end, two fiber gratings (2) are symmetrically set in supporting plate
(3) upper and lower surface.
The wide range fiber grating displacement of a kind of range-adjustable the most according to claim 1 and precision passes
Sensor, it is characterised in that described tooth bar (7) width is more than gear (4) width.
A kind of range-adjustable the most according to claim 1 and 2 and the wide range fiber grating position of precision
Displacement sensor, it is characterised in that the cross section of described tooth bar (7) is more than the cross section measuring bar (6).
The wide range fiber grating displacement of a kind of range-adjustable the most according to claim 1 and precision passes
Sensor, it is characterised in that described measurement bar (6) external diameter is less than the adjacent shells passing with it and leaning out
The external diameter 2～5mm of body (1) areole.
The wide range fiber grating displacement of a kind of range-adjustable the most according to claim 1 and precision passes
Sensor, it is characterised in that described shell body (1) is made up of corrosion resistant plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610159291.8A CN105841619A (en) | 2016-03-18 | 2016-03-18 | Wide range fiber grating displacement sensor capable of adjusting measuring range and precision |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610159291.8A CN105841619A (en) | 2016-03-18 | 2016-03-18 | Wide range fiber grating displacement sensor capable of adjusting measuring range and precision |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106597013A (en) * | 2017-01-20 | 2017-04-26 | 沈阳建筑大学 | Fiber grating accelerometer with adjustable sensitivity |
| 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 |
| CN110553591A (en) * | 2018-05-31 | 2019-12-10 | 上海微电子装备（集团）股份有限公司 | Displacement measurement system and photoetching machine |
| CN111023979A (en) * | 2019-12-13 | 2020-04-17 | 重庆大学 | Wide-range displacement monitoring device and method based on single-mode optical fiber bending loss |
| CN113340223A (en) * | 2021-06-02 | 2021-09-03 | 桂林理工大学 | Fiber grating strain sensor with adjustable measuring range and preparation and use methods thereof |
| CN114046722A (en) * | 2021-10-12 | 2022-02-15 | 中车唐山机车车辆有限公司 | Displacement meter |
| CN116164660A (en) * | 2023-04-21 | 2023-05-26 | 安徽省七星工程测试有限公司 | Fiber bragg grating dynamic deflection monitor and monitoring method |
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| JP2003014561A (en) * | 2001-06-29 | 2003-01-15 | Tatsuta Electric Wire & Cable Co Ltd | Strain sensor and strain sensing unit |
| CN101290214A (en) * | 2008-05-23 | 2008-10-22 | 宁波杉工结构监测与控制工程中心有限公司 | Optical fibre displacement transducer |
| CN103542871A (en) * | 2013-09-22 | 2014-01-29 | 山东建筑大学 | Optical fiber sensor on basis of carbon fiber materials |
| CN103673898A (en) * | 2013-12-11 | 2014-03-26 | 昆明理工大学 | Rotary fiber Bragg grating large displacement sensor based on gear and application method thereof |
| CN205537523U (en) * | 2016-03-18 | 2016-08-31 | 沈阳建筑大学 | Wide range fiber grating displacement sensor of adjustable range and precision |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003014561A (en) * | 2001-06-29 | 2003-01-15 | Tatsuta Electric Wire & Cable Co Ltd | Strain sensor and strain sensing unit |
| CN101290214A (en) * | 2008-05-23 | 2008-10-22 | 宁波杉工结构监测与控制工程中心有限公司 | Optical fibre displacement transducer |
| CN103542871A (en) * | 2013-09-22 | 2014-01-29 | 山东建筑大学 | Optical fiber sensor on basis of carbon fiber materials |
| CN103673898A (en) * | 2013-12-11 | 2014-03-26 | 昆明理工大学 | Rotary fiber Bragg grating large displacement sensor based on gear and application method thereof |
| CN205537523U (en) * | 2016-03-18 | 2016-08-31 | 沈阳建筑大学 | Wide range fiber grating displacement sensor of adjustable range and precision |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106597013A (en) * | 2017-01-20 | 2017-04-26 | 沈阳建筑大学 | Fiber grating accelerometer with adjustable sensitivity |
| 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 |
| CN110553591A (en) * | 2018-05-31 | 2019-12-10 | 上海微电子装备（集团）股份有限公司 | Displacement measurement system and photoetching machine |
| CN111023979A (en) * | 2019-12-13 | 2020-04-17 | 重庆大学 | Wide-range displacement monitoring device and method based on single-mode optical fiber bending loss |
| CN111023979B (en) * | 2019-12-13 | 2021-08-27 | 重庆大学 | Wide-range displacement monitoring device and method based on single-mode optical fiber bending loss |
| CN113340223A (en) * | 2021-06-02 | 2021-09-03 | 桂林理工大学 | Fiber grating strain sensor with adjustable measuring range and preparation and use methods thereof |
| CN113340223B (en) * | 2021-06-02 | 2022-12-09 | 桂林理工大学 | Fiber grating strain sensor with adjustable measuring range and preparation and use methods thereof |
| CN114046722A (en) * | 2021-10-12 | 2022-02-15 | 中车唐山机车车辆有限公司 | Displacement meter |
| CN114046722B (en) * | 2021-10-12 | 2023-06-23 | 中车唐山机车车辆有限公司 | Displacement meter |
| CN116164660A (en) * | 2023-04-21 | 2023-05-26 | 安徽省七星工程测试有限公司 | Fiber bragg grating dynamic deflection monitor and monitoring method |
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Application publication date: 20160810 |