CN205484407U - Optic fibre bragg grating high frequency acceleration sensor - Google Patents
Optic fibre bragg grating high frequency acceleration sensor Download PDFInfo
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- CN205484407U CN205484407U CN201620019842.6U CN201620019842U CN205484407U CN 205484407 U CN205484407 U CN 205484407U CN 201620019842 U CN201620019842 U CN 201620019842U CN 205484407 U CN205484407 U CN 205484407U
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- fiber bragg
- bragg raster
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- 230000001133 acceleration Effects 0.000 title claims abstract description 27
- 239000000835 fiber Substances 0.000 title claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 142
- 239000010959 steel Substances 0.000 claims abstract description 142
- 238000009795 derivation Methods 0.000 claims abstract description 9
- 238000003466 welding Methods 0.000 claims abstract description 7
- 239000013307 optical fiber Substances 0.000 claims description 129
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 abstract description 2
- 230000007774 longterm Effects 0.000 abstract description 2
- 238000000691 measurement method Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Abstract
The utility model relates to an optic fibre bragg grating high frequency acceleration sensor belongs to light electronic measurement technique field. The utility model discloses the quality piece is fixed in the top of steel pipe, the bottom of steel pipe is fixed in on the base, left side elastic steel sheet, right side elastic steel sheet arranges the both sides of controlling of steel pipe respectively in, left side elastic steel sheet, right side elastic steel sheet's lower extreme all is fixed in on the base, left side elastic steel sheet, the fixed both ends of controlling to the quality piece are connected respectively to right side elastic steel sheet's upper end, left side optic fibre bragg grating, left elastic steel sheet is pasted respectively to right side optic fibre bragg grating series welding carried forward, right side elastic steel sheet, left side optic fibre bragg grating, the one end of right side optic fibre bragg grating is through the fiber connection, left side optic fibre bragg grating, the derivation optic fibre of the right side optic fibre bragg grating other end is drawn forth on one side of the base respectively. The utility model discloses an adopt optic fibre bragg grating, have stronger anti -electromagnetic interference ability and corrosion -resistant ability and be applicable to the long -term monitoring to the transformer, simple structure, the operation of being convenient for.
Description
Technical field
This utility model relates to a kind of optical fiber Bragg raster high frequency acceleration transducer, belongs to technical field of electronic measurement.
Background technology
The work under bad environment of power transformer, and its work efficiency ratio is relatively low, therefore there is the biggest leakage field, is formed stronger
Electromagnetic interference, the operating temperature of power transformer is the highest, even shell is likely to reach the high temperature of about 70 degree.Transformator
Vibration monitoring environment is in the adverse circumstances of high voltage, highfield, high-temperature, and the vibration frequency range of transformator substantially exists
10～2000Hz.The sensor being presently available for transformator vibration detection is substantially electromagnetic sensor, common are current vortex
Sensor, piezoelectric transducer etc., its common feature is exactly that anti-electromagnetic interference capability is poor, and signal remote transmission ability is weak.
Fibre Optical Sensor have essential safety, have electromagnetism interference, signal can the advantage such as long-distance transmissions, become and learn in recent years
The focus of person's research.Although Fibre Optical Sensor carries out transformator vibration online monitoring in strong electromagnetic environment has natural advantage,
But current Fibre Optical Sensor is used for the detection of static amount, such as fire alarm, strain measurement etc., kinetic measurement can be used for
Sensor is considerably less, and optical fibre grating acceleration sensor is a current study hotspot.Various optical fibre grating acceleration sensors
Quickly grow and of a great variety.Cantilever beam type optical fibre grating acceleration transducer is stable because of its simple in construction performance, has obtained crowd
The favor of many scholars, is attached directly to grating cantilever beam from the initial stage and spreads out to it and stretch structure (as fixed) at 2, but cantilever beam from
Body is difficult to high-frequency range and measures, and majority can only be applied in low-frequency range, hinders its development.
During by using optical fiber Bragg raster high frequency acceleration transducer that power transformer is carried out real-time online vibration monitoring, need
The composition of acceleration transducer to be considered, and avoid excessive side interference.
Summary of the invention
This utility model provides a kind of optical fiber Bragg raster high frequency acceleration transducer, for solving to shake power transformer
Dynamic real-time online detection and solution are to the knot of optical fiber Bragg raster high frequency acceleration transducer during transformator vibration real-time online detection
Structure, the problem of installation.
The technical solution of the utility model is: a kind of optical fiber Bragg raster high frequency acceleration transducer, including left fiber Bragg
Grating 1, left elastic steel sheet 2, optical fiber 3, steel pipe 4, base 5, mass 6, right elastic steel sheet 7, right fiber Bragg light
Grid 8, derivation optical fiber 9；Wherein mass 6 is fixed on the top of steel pipe 4, and the bottom of steel pipe 4 is fixed on base 5, left bullet
Property steel disc 2, right elastic steel sheet 7 are respectively placed in the right and left of steel pipe 4, left elastic steel sheet 2, right elastic steel sheet 7 lower end all
Being fixed on base 5, left elastic steel sheet 2, the upper end of right elastic steel sheet 7 are affixed to the two ends, left and right of mass 6 respectively,
Left elastic steel sheet 2, right elastic steel sheet is pasted respectively after the series connection welding of left optical fiber Bragg raster 1, right optical fiber Bragg raster 8
7, left optical fiber Bragg raster 1, one end of right optical fiber Bragg raster 8 are connected by optical fiber 3, left optical fiber Bragg raster 1,
The derivation optical fiber 9 of right optical fiber Bragg raster 8 other end is drawn from base 5 side respectively.
Described left optical fiber Bragg raster 1 is pasted onto on the left of left elastic steel sheet 2, and right optical fiber Bragg raster 8 is pasted onto right elasticity
On the right side of steel disc 7.
Described left optical fiber Bragg raster 1, right optical fiber Bragg raster 8 use the light-sensitive optical fibre of same model to make.
Operation principle of the present utility model is:
When sensor is fixed on object under test and when vibrating with object, mass 6, steel pipe 4, left elastic steel sheet 2,
The elastic system of right elastic steel sheet 7 composition makees forced vibration, and outcome quality block 6 drives steel pipe 4, left elastic steel sheet 2, right elasticity
Strain variation made by steel disc 7 so that be pasted onto left elastic steel sheet 2, two fiber gratings of right elastic steel sheet 7 and left elastic steel sheet 2,
Right elastic steel sheet 7 one acts as strain variation, will cause the wavelength generation of left optical fiber Bragg raster 1, right optical fiber Bragg raster 8
Corresponding change, the detection of measurand acceleration is converted into the modulation to optical fiber Bragg raster wavelength；Wherein, fiber Bragg
Grating 1 is pasted onto on the left of left elastic steel sheet 2, and right optical fiber Bragg raster 8 is pasted onto on the right side of right elastic steel sheet 7, left fiber Bragg
Grating 1, right optical fiber Bragg raster 8 and left elastic steel sheet 2, the bonding method of right elastic steel sheet 7 contribute to offsetting the horizontal stroke of vibration
To interference, sensor is derived optical fiber 9 and is connected with FBG Decoder, constitutes optical fiber Bragg raster high frequency acceleration transducer.
Mathematics model analysis of the present utility model is as follows:
According to optic fiber grating wavelength in strain variation relational expression:
In formula: SεFor fibre strain sensitivity coefficient, ε is optical fiber Bragg raster strain, and Δ λ is the optical fiber caused by strain
The wavelength-shift of Bragg grating, λ is the centre wavelength of optical fiber Bragg raster.
Acceleration and the relation of strain in elastic system:
Available:
In formula (2), F be mass by the elastic force of steel pipe and elastic steel sheet effect and, m is mass quality, and s is elastic steel sheet
Cross-sectional area, E is the elastic modelling quantity (steel pipe is the same with the elastic modelling quantity of elastic steel sheet) of steel pipe, d1、d2Steel pipe is interior respectively
Footpath and external diameter.Formula (3) gives the linear changing relation of optic fiber grating wavelength knots modification and acceleration.
According to formula formula (3) sensor acceleration sensitivity:
According to design of the present utility model, optical fiber Bragg raster and the bonding method of elastic steel sheet contribute to offsetting the horizontal of vibration
Interference, obtains the correction formula of Δ λ:
Δ λ=(Δ λ1+Δλ2)/2 (5)
Δ λ in formula (5)1For the center wavelength variation value of left optical fiber Bragg raster, Δ λ2Center for right optical fiber Bragg raster
Wavelength variation values, formula (5) brings formula (3) into:
Coefficient of elasticity k according to the available steel pipe of formula (2) is:
In formula, L is the length of steel pipe.
Thus obtain system undamped resonant frequency
The beneficial effects of the utility model are:
1, when sensor is fixed on object under test and when vibrating with object, mass, steel pipe, elastic steel sheet composition
Elastic system makees forced vibration, and outcome quality block drives steel pipe, elastic steel sheet to make strain variation so that be pasted onto elastic steel sheet
Two fiber gratings and elastic steel sheet one act as strain variation, and the wavelength causing fiber grating produces corresponding change, tested right
As the detection of acceleration is converted into the modulation to optical fiber Bragg raster wavelength, it is left that optical fiber Bragg raster is pasted onto left elastic steel sheet
Side, right optical fiber Bragg raster is pasted onto on the right side of right elastic steel sheet, and optical fiber Bragg raster helps with the bonding method of elastic steel sheet
In offsetting the Horizonal Disturbing vibrated, adjust the quality of steel pipe, the cross-sectional area of elastic steel sheet and mass to adapt to different resonance frequency
The acceleration transducer design requirement of rate.
2, by using optical fiber Bragg raster, there is stronger anti-electromagnetic interference capability and corrosion resistance is applicable to transformator
Long term monitoring.
3, simple in construction, it is simple to operation.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model；
The left optical fiber Bragg raster of each label: 1-in figure, the left elastic steel sheet of 2-, 3-optical fiber, 4-steel pipe, 5-base, 6-mass,
The right elastic steel sheet of 7-, the right optical fiber Bragg raster of 8-, 9-derive optical fiber.
Detailed description of the invention
Embodiment 1: as it is shown in figure 1, a kind of optical fiber Bragg raster high frequency acceleration transducer, including left optical fiber Bragg raster
1, left elastic steel sheet 2, optical fiber 3, steel pipe 4, base 5, mass 6, right elastic steel sheet 7, right optical fiber Bragg raster 8,
Derive optical fiber 9；Wherein mass 6 is fixed on the top of steel pipe 4, and the bottom of steel pipe 4 is fixed on base 5, left Elastic Steel
Sheet 2, right elastic steel sheet 7 are respectively placed in the right and left of steel pipe 4, left elastic steel sheet 2, right elastic steel sheet 7 lower end the most fixing
On base 5, left elastic steel sheet 2, the upper end of right elastic steel sheet 7 are affixed to the two ends, left and right of mass 6 respectively, left
Left elastic steel sheet 2, right elastic steel sheet 7 is pasted respectively after the series connection welding of optical fiber Bragg raster 1, right optical fiber Bragg raster 8,
Left optical fiber Bragg raster 1, one end of right optical fiber Bragg raster 8 are connected by optical fiber 3, left optical fiber Bragg raster 1, the right side
The derivation optical fiber 9 of optical fiber Bragg raster 8 other end is drawn from base 5 side respectively.
Described left optical fiber Bragg raster 1 is pasted onto on the left of left elastic steel sheet 2, and right optical fiber Bragg raster 8 is pasted onto right elasticity
On the right side of steel disc 7.
Described left optical fiber Bragg raster 1, right optical fiber Bragg raster 8 use the light-sensitive optical fibre of same model to make.
Embodiment 2: as it is shown in figure 1, a kind of optical fiber Bragg raster high frequency acceleration transducer, including left optical fiber Bragg raster
1, left elastic steel sheet 2, optical fiber 3, steel pipe 4, base 5, mass 6, right elastic steel sheet 7, right optical fiber Bragg raster 8,
Derive optical fiber 9；Wherein mass 6 is fixed on the top of steel pipe 4, and the bottom of steel pipe 4 is fixed on base 5, left Elastic Steel
Sheet 2, right elastic steel sheet 7 are respectively placed in the right and left of steel pipe 4, left elastic steel sheet 2, right elastic steel sheet 7 lower end the most fixing
On base 5, left elastic steel sheet 2, the upper end of right elastic steel sheet 7 are affixed to the two ends, left and right of mass 6 respectively, left
Left elastic steel sheet 2, right elastic steel sheet 7 is pasted respectively after the series connection welding of optical fiber Bragg raster 1, right optical fiber Bragg raster 8,
Left optical fiber Bragg raster 1, one end of right optical fiber Bragg raster 8 are connected by optical fiber 3, left optical fiber Bragg raster 1, the right side
The derivation optical fiber 9 of optical fiber Bragg raster 8 other end is drawn from base 5 side respectively.
Described left optical fiber Bragg raster 1 is pasted onto on the left of left elastic steel sheet 2, and right optical fiber Bragg raster 8 is pasted onto right elasticity
On the right side of steel disc 7.
Embodiment 3: as it is shown in figure 1, a kind of optical fiber Bragg raster high frequency acceleration transducer, including left optical fiber Bragg raster
1, left elastic steel sheet 2, optical fiber 3, steel pipe 4, base 5, mass 6, right elastic steel sheet 7, right optical fiber Bragg raster 8,
Derive optical fiber 9；Wherein mass 6 is fixed on the top of steel pipe 4, and the bottom of steel pipe 4 is fixed on base 5, left Elastic Steel
Sheet 2, right elastic steel sheet 7 are respectively placed in the right and left of steel pipe 4, left elastic steel sheet 2, right elastic steel sheet 7 lower end the most fixing
On base 5, left elastic steel sheet 2, the upper end of right elastic steel sheet 7 are affixed to the two ends, left and right of mass 6 respectively, left
Left elastic steel sheet 2, right elastic steel sheet 7 is pasted respectively after the series connection welding of optical fiber Bragg raster 1, right optical fiber Bragg raster 8,
Left optical fiber Bragg raster 1, one end of right optical fiber Bragg raster 8 are connected by optical fiber 3, left optical fiber Bragg raster 1, the right side
The derivation optical fiber 9 of optical fiber Bragg raster 8 other end is drawn from base 5 side respectively.
Described left optical fiber Bragg raster 1, right optical fiber Bragg raster 8 use the light-sensitive optical fibre of same model to make.
Embodiment 4: as it is shown in figure 1, a kind of optical fiber Bragg raster high frequency acceleration transducer, including left optical fiber Bragg raster
1, left elastic steel sheet 2, optical fiber 3, steel pipe 4, base 5, mass 6, right elastic steel sheet 7, right optical fiber Bragg raster 8,
Derive optical fiber 9；Wherein mass 6 is fixed on the top of steel pipe 4, and the bottom of steel pipe 4 is fixed on base 5, left Elastic Steel
Sheet 2, right elastic steel sheet 7 are respectively placed in the right and left of steel pipe 4, left elastic steel sheet 2, right elastic steel sheet 7 lower end the most fixing
On base 5, left elastic steel sheet 2, the upper end of right elastic steel sheet 7 are affixed to the two ends, left and right of mass 6 respectively, left
Left elastic steel sheet 2, right elastic steel sheet 7 is pasted respectively after the series connection welding of optical fiber Bragg raster 1, right optical fiber Bragg raster 8,
Left optical fiber Bragg raster 1, one end of right optical fiber Bragg raster 8 are connected by optical fiber 3, left optical fiber Bragg raster 1, the right side
The derivation optical fiber 9 of optical fiber Bragg raster 8 other end is drawn from base 5 side respectively.
Its design parameter is:
1, mass parameter is: quality m=0.1 kilogram, and the length of side is the square of 10mm；Outer diameter of steel pipes d2=10mm, steel
Bore d1=9.5mm, length L=40mm of steel pipe；Cross-sectional area s=1mm*0.5mm of elastic steel sheet, Young ' s mould
Amount is E=128GPa；
2, the technical parameter of optical fiber Bragg raster is: central wavelength lambda=1550nm, Sε=0.78*10-6με-1；
3, by accompanying drawing 1 configuration experiment；
4, the Bragg wavelength of optical fiber Bragg raster is obtained with fiber Bragg grating (FBG) demodulator；
5, according to formula (5), according to the center wavelength variation value Δ λ being pasted onto optical fiber Bragg raster on elastic steel sheet1、Δλ2Can
Obtain the acceleration a of measurand:
Each known quantity is substituted into formula (4), (8), and Theoretical Calculation shows, sensor resonant frequency is 2649.1Hz, sensitivity
Coefficient is 1.1pm/g.
Above in conjunction with accompanying drawing, detailed description of the invention of the present utility model is explained in detail, but on this utility model is not limited to
State embodiment, in the ken that those of ordinary skill in the art are possessed, it is also possible to without departing from this utility model objective
On the premise of various changes can be made.
Claims (3)
1. an optical fiber Bragg raster high frequency acceleration transducer, it is characterised in that: include left optical fiber Bragg raster (1),
Left elastic steel sheet (2), optical fiber (3), steel pipe (4), base (5), mass (6), right elastic steel sheet (7), right optical fiber
Bragg grating (8), derivation optical fiber (9)；Wherein mass (6) is fixed on the top of steel pipe (4), the end of steel pipe (4)
Portion is fixed on base (5), and left elastic steel sheet (2), right elastic steel sheet (7) are respectively placed in the right and left of steel pipe (4),
Left elastic steel sheet (2), the lower end of right elastic steel sheet (7) are all fixed on base (5), left elastic steel sheet (2), right elasticity
The upper end of steel disc (7) is affixed to the two ends, left and right of mass (6), left optical fiber Bragg raster (1), right optical fiber respectively
Left elastic steel sheet (2), right elastic steel sheet (7), left fiber Bragg light is pasted respectively after Bragg grating (8) series connection welding
Grid (1), one end of right optical fiber Bragg raster (8) are connected by optical fiber (3), left optical fiber Bragg raster (1), right light
The derivation optical fiber (9) of fiber Bragg grating (8) other end is drawn from base (5) side respectively.
Optical fiber Bragg raster high frequency acceleration transducer the most according to claim 1, it is characterised in that: described left optical fiber
Bragg grating (1) is pasted onto left elastic steel sheet (2) left side, and right optical fiber Bragg raster (8) is pasted onto right elastic steel sheet (7)
Right side.
Optical fiber Bragg raster high frequency acceleration transducer the most according to claim 1, it is characterised in that: described left optical fiber
Bragg grating (1), right optical fiber Bragg raster (8) use the light-sensitive optical fibre of same model to make.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620019842.6U CN205484407U (en) | 2016-01-11 | 2016-01-11 | Optic fibre bragg grating high frequency acceleration sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620019842.6U CN205484407U (en) | 2016-01-11 | 2016-01-11 | Optic fibre bragg grating high frequency acceleration sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510631A (en) * | 2016-01-11 | 2016-04-20 | 昆明理工大学 | High-frequency acceleration sensor with optical fiber Bragg gratings and application method of high-frequency acceleration sensor |
| CN107907202A (en) * | 2017-10-27 | 2018-04-13 | 北京大学 | It is a kind of to realize common-mode noise from the optical fiber vector hydrophone and its method for sensing suppressed |
| CN108205070A (en) * | 2016-12-19 | 2018-06-26 | 中国石油天然气股份有限公司 | Optical fiber acceleration transducer |
-
2016
- 2016-01-11 CN CN201620019842.6U patent/CN205484407U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510631A (en) * | 2016-01-11 | 2016-04-20 | 昆明理工大学 | High-frequency acceleration sensor with optical fiber Bragg gratings and application method of high-frequency acceleration sensor |
| CN108205070A (en) * | 2016-12-19 | 2018-06-26 | 中国石油天然气股份有限公司 | Optical fiber acceleration transducer |
| CN108205070B (en) * | 2016-12-19 | 2020-01-07 | 中国石油天然气股份有限公司 | Optical fiber acceleration sensor |
| CN107907202A (en) * | 2017-10-27 | 2018-04-13 | 北京大学 | It is a kind of to realize common-mode noise from the optical fiber vector hydrophone and its method for sensing suppressed |
| CN107907202B (en) * | 2017-10-27 | 2019-09-13 | 北京大学 | It is a kind of to realize common-mode noise from the optical fiber vector hydrophone and its method for sensing inhibited |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160817 Termination date: 20180111 |
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| CF01 | Termination of patent right due to non-payment of annual fee |