CN206311247U - A kind of sensor device of power and displacement measurement based on distributed fibre optic sensing - Google Patents
A kind of sensor device of power and displacement measurement based on distributed fibre optic sensing Download PDFInfo
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- CN206311247U CN206311247U CN201621413542.2U CN201621413542U CN206311247U CN 206311247 U CN206311247 U CN 206311247U CN 201621413542 U CN201621413542 U CN 201621413542U CN 206311247 U CN206311247 U CN 206311247U
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 41
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Abstract
The utility model discloses a kind of power based on distributed fibre optic sensing and the sensor device of displacement measurement.Distributed strain sensing optical fiber pastes the circle of side wall one in thin-wall metal circular ring along total length epoxy resin glue；Optical fiber demodulating apparatus are serially connected with the distributed strain sensing optical fiber pasted in thin-wall metal circular ring side wall by signal transmission fiber, and are connected to computer by serial ports, netting twine；After thin-wall metal circular ring apex applying power or displacement, the hoop strain produced under loading effect using optical fiber demodulating apparatus and computer acquisition, record thin-wall metal circular ring is distributed；Strain Monitoring Data is smoothed using the method for moving average, and trigonometric function is fitted, to obtain the maximum ring strain value of thin-wall metal circular ring, so as to be calculated power and displacement；The active force and the linear relation of corresponding displacement of the strain value and thin-wall metal circular ring apex are obtained by rating test, the calibration coefficient of sensor is obtained on this basis.
Description
Technical field
The utility model belongs to fiber optic sensor technology field, more particularly to a kind of power based on distributed fibre optic sensing and
The sensor device of displacement measurement.
Background technology
Thin-wall metal circular ring is widely used in traditional earthwork test Instrument as force snesor, such as non-confining strength
Degree test instrument, triaxial apparatus, direct shear apparatus etc..These instruments be by dial gauge, amesdial read deformation of the annulus under load come
Realize the measurement of power.But in most cases, this method certainty of measurement is relatively low, and range ability is smaller, and need regularly to mark
It is fixed.Still an alternative is that be attached to foil gauge with adhesive constituting resistance bridge on metal ring, then strain is caused
Resistance variations be converted into voltage signal.The defect of the method is that test reading easily receives electromagnetic interference, and reading is forbidden.Due to power and
The Measurement reliability of displacement is poor, seriously hinders the development of earthwork test Instrument.
In recent years, the development that Distributed Optical Fiber Sensing Techniques are advanced by leaps and bounds.The technology can be with Quick Acquisition to light
The optical signal of fine optional position, and be strain, temperature that can obtain optical fiber along all positions of total length etc. with reference to related transducer principle
Physical parameter, realizes the distributed monitoring that routine monitoring technology is difficult to.The other technology have data volume it is big, without electromagnetism
Interference, it is full-automatic, can remote monitoring the features such as.Just because of these advantages, distributed optical fiber sensing technology is by more and more
It is applied in all kinds of engineering structure monitorings and laboratory test.
The principle of Brillouin optical time domain analysis/reflection technology (BOTDA/R) is using the Brillouin scattering optical frequency in optical fiber
Rate variable quantity (frequency shift amount) and optical fiber axial direction strain or environment temperature between linear relationship come realize sensing, the relation can be with table
It is shown as：
In formula：νB(ε,T)、νB(ε0,T0) it is respectively the frequency shift amount of Brillouin scattering in the forward and backward optical fiber of measurement；ε、ε0Point
Axial strain before and after Wei not testing；T、T0Respectively test front and rear temperature value.Proportionality coefficientWith's
Value is respectively 0.05MHz/ μ ε and 1.2MHz/ DEG C.
The content of the invention
The purpose of this utility model is to provide the sensor dress of a kind of power based on distributed fibre optic sensing and displacement measurement
Put, so that power, displacement data measured by soil test are more accurate, reliable, and automatic measurement is realized, so as to thoroughly solve
Certainly existing earthwork test Instrument is low to power, displacement measurement accuracy, by defects such as electromagnetic interferences.
To solve the above problems, the utility model uses following technical scheme：One kind based on distributed fibre optic sensing power and
The sensor device of the measurement of displacement, mainly includes distributed strain sensing optical fiber, thin wall circular, signal transmission fiber, optical fiber
Demodulated equipment and computer；Distributed strain sensing optical fiber is serially connected by signal transmission fiber with optical fiber demodulating apparatus, meter
Calculation machine and optical fiber demodulating apparatus are connected using serial ports, netting twine；Described distributed strain sensing optical fiber is pasted in thin wall circular side
On wall.
Whole distributed strain sensing optical fiber is pasted along total length and is fixed on the side wall of thin wall circular.
Mutual welding, is cased with thermal shrinkable sleeve outside fusion point between the distributed strain sensing optical fiber and signal transmission fiber
Pipe.
Beneficial effect：
(1) according to mechanical analysis, there is ideal between thin wall circular apex active force and displacement and maximum hoop strain
Linear relationship, be derived from calibration coefficient K1And K2；
(2) a kind of power and displacement measurement method based on distributed fibre optic sensing are proposed, is realized to thin wall circular deformation
In high precision, automatically, distributed testing, overcome the problems such as conventional method efficiency is low, error big, Monitoring Data amount is small；
(3) install that simple, measurement is accurate, high degree of automation, cost performance are good using the utility model.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model；
Fig. 2 is distribution type fiber-optic dynamometry and the biosensor assay schematic device of displacement in embodiment；Wherein, 1 is distribution
Formula straining and sensing optical fiber, 2 is thin wall circular, 3 signal transmission fibers, and 4 is computer, and 5 is optical fiber demodulating apparatus, and 6 is omnipotent examination
Test machine.
Fig. 3 is fibre strain reading and fitted figure in the utility model embodiment；
Fig. 4-5 is the comparing between the theoretical calculation in the utility model embodiment and actually measured value；
Specific embodiment
The technical solution of the utility model is more specifically described below in conjunction with drawings and Examples.
A kind of distribution type fiber-optic force cell, including distributed strain sensing optical fiber, thin wall circular, signal light transmission
Fine, optical fiber demodulating apparatus and computer.Optical fiber demodulating apparatus with paste the distribution on thin-wall circular ring-side wall (inwall or outer wall)
Formula straining and sensing optical fiber is serially connected by signal transmission fiber, and computer and optical fiber demodulating apparatus are connected using serial ports, netting twine.
Used as the further optimization of such scheme, the thin wall circular is using the gold with linear elasticity strain-stress relation
Category material is made.
As the further optimization of such scheme, in order to there is uniformity in the deformation for ensureing optical fiber and metal ring, will be whole
Root distributed strain sensing optical fiber is tightly pasted on the thin-wall circular ring-side wall along total length epoxy resin, is placed in interior
24h, makes it be pasted firmly with annulus.Because optical fiber is soft, the mode that only total length is pasted just can guarantee that optical fiber and thin-walled
Circle ring-side wall is uniformly close to, and using colligation, fixed point such as pastes at the mode can cause measurement error.
As the further optimization of such scheme, between the distributed strain sensing optical fiber and signal transmission fiber mutually
Welding, and protect fusion point with heat-shrinkable T bush.
In such scheme, in the thin wall circular apex applying power or displacement, make to paste on thin-wall circular ring-side wall
Distributed strain sensing optical fiber strain, with optical fiber demodulating apparatus and computer acquisition, record the ring of the thin wall circular
To strain value；
Further, strain Monitoring Data is smoothed using the method for moving average, the dependent variable after smoothing processing
According to trigonometric function feature is met, it is fitted in the form of cosine function ε (x)=acos [b (x-c)]+d, in formula：Parameter a=| ε
|maxRepresent the maximum ring strain value that obtains of fitting, parameter b is used to eliminate function cycle error, parameter c is used to eliminate in loading
The eccentric error of presence, parameter d is used to eliminate the error that temperature change is brought, and x represents that ε (x) represents thin wall circular in certain lotus
Hoop strain value under load, displacement.On the one hand can very well reflect the strain curve feature of thin wall circular using the fitting function,
Still further aspect be due to the fit approach can eliminate experiment in various errors, improve measuring accuracy.Obtained according to fit equation
Go out maximum ring strain value | the ε | of thin wall circular under a constant load, displacementmax；
Further, according to F=K1×|ε|maxWith Δ D=K2×|ε|max, thin wall circular is obtained by maximum ring strain value
The amount of force of apex and corresponding displacement, in formula：F represents the power acted in thin wall circular；Δ D represents thin wall circular
The displacement that apex occurs；K1、K2Respectively constant, is determined by rating test.In such scheme, pushed away by theoretical formula
Lead and learn, the active force of thin wall circular apex and displacement have above-mentioned linear pass with thin wall circular maximum ring strain value
System.
Further, in order to obtain calibration coefficient K1、K2, the thin wall circular that will paste distributed strain sensing optical fiber puts
Put on loading bench, distributed strain sensing optical fiber is connected to optical fiber demodulating apparatus with signal transmission fiber, optical fibre interrogation sets
Standby connection computer；Apply active force and the displacement of known dimensions in thin wall circular apex, make to paste in thin-wall circular ring-side wall
On distributed strain sensing optical fiber strain, with optical fiber demodulating apparatus, computer acquisition, record the ring of the thin wall circular
To strain measured value；Strain data is smoothed using the method for moving average, and is fitted using cosine function.According to plan
Close equation and draw maximum ring strain value of the thin wall circular under a constant load；By changing the effect being applied in thin wall circular
Power and displacement, obtain maximum ring strain value of the thin wall circular under different active forces, displacement.According to formula F=K1×|ε|max
With Δ D=K2×|ε|maxCalculate calibration coefficient K1、K2Size.
The utility model principle：Annulus is measured in external force using the distributed strain sensing optical fiber pasted in thin wall circular
The lower hoop strain for occurring of effect；The strain value of distributed strain sensing optical fiber is collected by optical fiber demodulating apparatus and computer；
Strain data to being collected into carries out smooth and process of fitting treatment, obtains the maximum ring strain value of thin wall circular；According to thin-wall circular
Linear relationship between ring apex active force and corresponding displacement and maximum ring strain value is calculated exerts oneself and displacement.
Embodiment 1
Such as Fig. 2, a kind of distribution type fiber-optic dynamometry and displacement transducer, including distributed strain sensing optical fiber 1, thin wall circular
2nd, signal transmission fiber 3, computer 4, optical fiber demodulating apparatus 5, universal testing machine 6.In order to ensure optical fiber and gold in methods described
There is uniformity in the deformation for belonging to annulus, distributed strain sensing optical fiber 1 is pasted in thin wall circular 2 with glue such as epoxy resin
Outer wall, is placed in indoor 24h, it is pasted firmly with the surface of thin wall circular 2.The optical fiber demodulating apparatus 5 with paste in thin-walled
The distributed strain sensing optical fiber 1 of the side wall of annulus 2 is serially connected by signal transmission fiber 3.The distributed strain senses light
The mutual weld of fibre 1 and signal transmission fiber 3 is cased with heat-shrinkable T bush protection.The reading of the distributed strain sensing optical fiber 1
By optical fiber demodulating apparatus 5 and the automatic data collection of computer 4.Optical fiber employed in embodiment is the single mode list of a diameter of 0.9mm
Core tightly packaged fiber.
Described device is loaded on universal testing machine 6 using at the uniform velocity displacement load mode, aobvious on universal testing machine 6
Show the strength and the displacement relation curve in instrument record loading procedure, the measured value be used for verifying the active force that fibre strain extrapolates,
The accuracy of displacement.
When the apex of thin wall circular 2 is acted on by power, the distributed sensing fiber on the side wall of thin wall circular 2 is pasted
1 strains, and the strain will set the Brillouin scattering frequency shifts on distributed strain sensing optical fiber, optical fibre interrogation
It is standby in real time to measure the frequency shift amount, so as to obtain the hoop strain distribution situation of metal ring.In order to eliminate measurement error, adopt
With the method for moving average to being smoothed to measured strain data.
There is ellipticity deformation in thin wall circular, the radial displacement of each point is in thin wall circular under radial forces：
In formula：Y is the radial displacement of each point in thin wall circular,It is azimuth, Δ D is diameter change amount.According further to power
, there is following relation in thin wall circular between the radial displacement of each point and moment of flexure in theory：
In formula：It is thin wall circular institute bending moment, E is the elastic modelling quantity of thin wall circular, and I is the inertia of thin wall circular
Square, R is the radius of thin wall circular.Obtained by above formula：WhenAt=90 °, thin wall circular
Maximum hoop strain beThe formula is rewritable to beIn formula：K2For
The calibration coefficient of displacement, D is the diameter of thin wall circular.Thin wall circular Stress calculation according to Timoshenko in Elasticity is public
Formula, can obtain the formula of the inside and outside wall hoop strain ε of certain lower thin wall circular of radial load effect
In formula：ω is the thickness of thin wall circular, and δ is the width of thin wall circular, and F is suffered by unit thickness in thin wall circular
The opposite radial forces of both direction, θ is azimuth, RaFor the central diameter E of metal ring is the elastic modelling quantity of thin wall circular.When
During θ=90 °, the absolute value of thin-wall circular hoop strain reaches maximum, andIt is further converted intoIn formula：K1It is the calibration coefficient of power.
The implementation method of rating test includes：Rightabout radial effect is applied to metal ring using loading device
Power, etc. the hoop strain reading that thin wall circular is recorded after stable reading, then multistage loadings, record strain data successively.
The measured reading strain method of moving average is smoothed to data, the thin-wall circular obtained to smoothing processing
Ring hoop strain reading carries out the form fitting of cosine function ε (x)=acos [b (x-c)]+d, in formula：Parameter a=| ε |maxTable
Show the maximum ring strain value that fitting is obtained, parameter b is used to eliminate function cycle error, parameter c exists in being used to eliminate loading
Eccentric error, parameter d is used to eliminate the error that temperature change is brought.Show that thin wall circular is corresponding under every grade of load accordingly
Maximum ring strain value | ε |max。
The size of active force and displacement is drawn according to theoretical formula method, the display instrument reading that last and loading device is carried
Contrasted.And draw the relation curve of theoretical calculation active force and displacement and actual measured value.As shown in Figures 4 and 5, from figure
It can be seen that the result of calculation and actual measured value of power and displacement measurement method based on distributed fibre optic sensing are closely.
There is relation F=K between the active force of thin wall circular apex and displacement and maximum hoop strain1×|ε|max
With Δ D=K2×|ε|max, the result obtained according to above step calculates calibration coefficient K1And K2Size.The calibration coefficient can
As the design parameter of sensor.
It should be noted that in addition to the implementation, the utility model can also have other embodiment.It is all to use equivalent
The technical scheme that replacement or equivalent transformation are formed, all falls within the protection domain of the utility model patent requirements.
Claims (3)
1. a kind of sensor device of the measurement based on distributed fibre optic sensing power and displacement, it is characterised in that main to include point
Cloth straining and sensing optical fiber, thin wall circular, signal transmission fiber, optical fiber demodulating apparatus and computer；Distributed strain senses light
Fibre is serially connected by signal transmission fiber with optical fiber demodulating apparatus, and computer and optical fiber demodulating apparatus are connected using serial ports, netting twine
Connect；Described distributed strain sensing optical fiber is pasted on thin-wall circular ring-side wall.
2. according to claim 1 for the sensor device based on distributed fibre optic sensing power and the measurement of displacement, its
It is characterised by, whole distributed strain sensing optical fiber is pasted along total length and be fixed on the side wall of thin wall circular.
3. according to claim 1 for the sensor device based on distributed fibre optic sensing power and the measurement of displacement, its
It is characterised by, mutual welding, is cased with pyrocondensation outside fusion point between the distributed strain sensing optical fiber and signal transmission fiber
Sleeve pipe.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106525301A (en) * | 2016-12-22 | 2017-03-22 | 南京大学 | Force and displacement measurement method and sensor based on distributed optical fiber sensing |
| CN109163665A (en) * | 2018-06-15 | 2019-01-08 | 广东电网有限责任公司 | A kind of civil structure point three-dimensional displacement monitoring method based on Distributed Optical Fiber Sensing Techniques |
| CN109708807A (en) * | 2019-01-04 | 2019-05-03 | 北京康姆特科技发展有限公司 | A kind of scaling method and device of composite material vessel built-in fiber sensor |
| CN112985981A (en) * | 2021-02-09 | 2021-06-18 | 北京工业大学 | Radial dynamic strain detection device |
-
2016
- 2016-12-22 CN CN201621413542.2U patent/CN206311247U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106525301A (en) * | 2016-12-22 | 2017-03-22 | 南京大学 | Force and displacement measurement method and sensor based on distributed optical fiber sensing |
| CN106525301B (en) * | 2016-12-22 | 2023-01-06 | 南京大学 | Force and displacement measuring method and sensor based on distributed optical fiber sensing |
| CN109163665A (en) * | 2018-06-15 | 2019-01-08 | 广东电网有限责任公司 | A kind of civil structure point three-dimensional displacement monitoring method based on Distributed Optical Fiber Sensing Techniques |
| CN109163665B (en) * | 2018-06-15 | 2020-04-14 | 广东电网有限责任公司 | Civil structure point three-dimensional displacement monitoring method based on distributed optical fiber sensing technology |
| CN109708807A (en) * | 2019-01-04 | 2019-05-03 | 北京康姆特科技发展有限公司 | A kind of scaling method and device of composite material vessel built-in fiber sensor |
| CN112985981A (en) * | 2021-02-09 | 2021-06-18 | 北京工业大学 | Radial dynamic strain detection device |
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