CN107907252A - A kind of lever fiber bragg grating pressure sensor - Google Patents
A kind of lever fiber bragg grating pressure sensor Download PDFInfo
- Publication number
- CN107907252A CN107907252A CN201710990945.6A CN201710990945A CN107907252A CN 107907252 A CN107907252 A CN 107907252A CN 201710990945 A CN201710990945 A CN 201710990945A CN 107907252 A CN107907252 A CN 107907252A
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- Prior art keywords
- lever
- metallic elastic
- elastic component
- pressure sensor
- pressure
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- 239000000835 fiber Substances 0.000 title claims abstract description 59
- 239000002184 metal Substances 0.000 claims abstract description 42
- 229910052751 metal Inorganic materials 0.000 claims abstract description 42
- 230000001681 protective effect Effects 0.000 claims description 19
- 239000013307 optical fiber Substances 0.000 claims description 13
- 238000009530 blood pressure measurement Methods 0.000 abstract description 10
- 230000008859 change Effects 0.000 abstract description 6
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 230000001953 sensory effect Effects 0.000 abstract 1
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000003862 health status Effects 0.000 description 1
- 230000036244 malformation Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
Abstract
The present invention is a kind of lever fiber bragg grating pressure sensor, belongs to sensory field of optic fibre.The sensor is using diaphragm and lever combination structure, based on lever balance theory, the vertical pressure that will act at sensor diaphragm is converted into the elongation of metallic elastic component, fiber grating for pressure measurement is pasted onto metallic elastic component center, produced with metallic elastic component and cooperate with strain, cause wavelength change.Metal ball interlocks with spherical groove at balance pivot of the present invention, realizes the rotation of lever；Lever bottom is milled with three spherical grooves, adjusts the fulcrum of lever in the position of groove by adjusting metal ball, realizes the adjustable purpose of Pressure Sensor Precision, range.The present invention provides the theoretical relationship between lever fiber bragg grating pressure sensor pressure and optic fiber grating wavelength change, and real-time monitoring of the lever fiber bragg grating pressure sensor to pressure is realized in the data acquisition changed by fiber Bragg grating (FBG) demodulator to optic fiber grating wavelength.
Description
Technical field
The present invention is based on fiber grating sensing technology, is related to a kind of structure of pressure sensor, belongs to optical fiber sensing technology
Field.
Background technology
Pressure is that excessive pressure not only makes structure produce larger deformation the main reason for causing malformation, damage,
Reduce structure bearing capacity, can also shortening structure service life.Therefore, in engineering by pressure sensor to suffered by structure
Pressure is monitored the security for carrying out evaluation structure.In recent years, with the continuous development of fiber grating sensing technology, fiber grating
With excellent performances such as small, the corrosion-resistant, electromagnetism interferences of transmission loss.At present, some researchers develop fiber grating pressure
Force snesor, as a kind of new sensor, can realize to the remote long-term of pressure compared with conventional pressure sensor
Stability monitoring.Due in Practical Project requirement to pressure sensor performance indicator be continuously improved, it is necessary to develop range, precision and
The relevant parameters such as sensitivity meet the fiber bragg grating pressure sensor of application request.The present invention is excellent using fiber grating
Characteristic, the sensing principle based on fiber grating develop that a kind of structure type is simple, easy to process, durability is good, and measure
The lever fiber bragg grating pressure sensor that journey, precision can be adjusted monitors the real-time of pressure to realize.
The content of the invention
It is an object of the invention to the good characteristic using fiber grating, using diaphragm and lever combination structure, based on thick stick
Bar equilibrium principle, there is provided a kind of structure type is simple, easy to process, anticorrosive, the linearity is good, the adjustable lever of precision
Fiber bragg grating pressure sensor.
To achieve these goals, the technical solution adopted by the present invention to solve the technical problems is：
A kind of lever fiber bragg grating pressure sensor, including：Metallic elastic diaphragm, latch, lever, groove, metal ball,
Bearing, metallic elastic component one, the fiber grating for measuring pressure, metallic elastic component two, temperature compensation optical fiber grating, gold
Belong to outer protective shell, reserving hole；
Metallic elastic diaphragm surrounding is fixed at the top of the outer protective shell of metal, and metallic elastic its center is overlapped on latch top
Portion, latch top stop bit on lever, through the hole on the left of lever arrange by latch lower part；
Lever lower end is equipped with three grooves, and metal ball upper end is held in an inside grooves of lever bottom, under metal ball
End is abutted with bearing, and bearing is fixed on the outer protective shell base of metal；
Metallic elastic component one is connected with lever right end, one lower end of metallic elastic component is fixed in the outer protective shell bottom of metal
On seat；
Fiber grating for measuring pressure is pasted onto the center of metallic elastic component one, metallic elastic component two with
Metallic elastic component one is correspondingly arranged at outside metal in protective shell；Temperature compensation optical fiber grating is pasted onto and metallic elastic component
Two center；
The outer protective shell bottom of metal is equipped with reserving hole.
Groove is ball-type groove, and metal ball upper end is held in one of inside grooves.
Latch is thick for upper end, the thin hierarchic structure in lower end.
The present invention has the advantage that is with effect：
1st, metallic elastic diaphragm size need to meet thin plate condition and small deflection condition in the present invention, and by metallic elastic diaphragm
The top of the outer protective shell of metal is fixedly arranged at, meets the model of metallic elastic diaphragm arbitrary loading.
2nd, it is connected in the present invention at balance pivot in the form of metal ball interlocks with ball-type groove, reduces lever rotation
When frictional force influence.
3rd, lever bottom is milled with three spherical grooves in the present invention, can be by adjusting metal ball in the position of spherical groove
Put, that is, the adjusting of lever fiber bragg grating pressure sensor range and precision is realized in the position for adjusting balance pivot.
4th, the present invention is used sets the sheet metal identical with its material at the symmetric position of metallic elastic component, and at this
Sticking temperature compensated optical fiber grating on sheet metal, is realized to the fiber grating temperature for measuring pressure in long-term pressure monitoring
Real-Time Compensation is spent, reduces the error of pressure measurement, improves the accuracy of pressure measurement.
Brief description of the drawings
Fig. 1 is a kind of front view of lever fiber bragg grating pressure sensor of the present invention.
Fig. 2 is a kind of top view of lever fiber bragg grating pressure sensor of the present invention.
Fig. 3 is a kind of graphics of lever fiber bragg grating pressure sensor of the present invention.
Embodiment
1-3 and embodiment are described in further detail the present invention below in conjunction with the accompanying drawings, but the protection of the present invention
Scope is limited from specific embodiment, is subject to claims.In addition, with without prejudice to the premise of technical solution of the present invention
Under, those of ordinary skill in the art made for the present invention any modifications or changes easy to implement fall within the power of the present invention
Within sharp claimed range.
A kind of lever fiber bragg grating pressure sensor, it is characterised in that including：Metallic elastic diaphragm 1, latch 2, lever
3rd, groove 4, metal ball 5, bearing 6, metallic elastic component 1, the fiber grating 8 for measuring pressure, metallic elastic component two
9th, temperature compensation optical fiber grating 10, metal outer protective shell 11, reserving hole 12；
1 surrounding of metallic elastic diaphragm is fixed in the outer top of protective shell 11 of metal, and 1 center of metallic elastic diaphragm is overlapped on latch
2 tops, 2 top stop bit of latch on lever 3, arrange by the hole in 2 lower part of latch through the left side of lever 3；
3 lower end of lever is equipped with three grooves 4, and 5 upper end of metal ball is held in inside a groove 4 of 3 bottom of lever, metal
5 lower end of ball is abutted with bearing 6, and bearing 6 is fixed on metal 11 base of outer protective shell；
Metallic elastic component 1 is connected with 3 right end of lever, one 7 lower end of metallic elastic component is fixed in outside metal and protects
On 11 base of shell；
Fiber grating 8 for measuring pressure is pasted onto the center of metallic elastic component 1, metallic elastic component two
9 are correspondingly arranged at outside metal in protective shell 11 with metallic elastic component 1；Temperature compensation optical fiber grating 10 is pasted onto and metal
The center of flexible member 29；Outer 11 bottom of protective shell of metal is equipped with reserving hole 12.
Groove 4 is ball-type groove, and 5 upper end of metal ball is held in inside one of groove 4.
Latch 2 is thick for upper end, the thin hierarchic structure in lower end.
The present invention is a kind of lever fiber bragg grating pressure sensor, and the outer protective shell of metal and metallic elastic diaphragm be not using
The Steel material that becomes rusty carries out closed protection to sensor internal, improves the corrosion resistance and service life of sensor；Metallic elastic
The size of diaphragm meets thin plate condition and small deflection condition, is connected at the top center of metallic elastic its center and latch, its
Structure type is reduced to the diaphragm with rigid central, and theoretical calculation is carried out using the Deflection Formula with rigid central diaphragm；
Latch is connected with lever by the form for the hitch that drills, and metallic elastic component is connected with lever right end in the form of consolidation, is passed
Pass that mechanism is simple, the center amount of deflection that metallic elastic diaphragm produces under vertical uniform load q is directly passed to a lever left side by latch
Side, lever left side produce vertical displacement, recycle the structure type of lever to be converted into the elongation of metallic elastic component so that gold
Belong to flexible member and produce certain stretching strain；Fiber grating for pressure measurement is vertically pasted onto in metallic elastic component
Center portion position, produces with metallic elastic component and cooperates with strain, passes through optical fiber light of the fiber Bragg grating (FBG) demodulator demodulation for pressure measurement
The change of grid centre wavelength, realizes the measurement to pressure；Lever by the spherical groove of lever bottom and is placed in branch with fulcrum
The form connection that metal ball on seat interlocks so that lever is rotated at fulcrum in the form of rolling, and is reduced frictional force and is being passed
Influence during passing；The bottom of lever is provided with three spherical grooves, can adjust metal ball in lever by mobile support saddle
The position of bottom hemispheric groove adjusts the position of balance pivot, realizes that the precision of lever fiber bragg grating pressure sensor is adjustable
The purpose of section；Temperature compensation optical fiber grating is pasted onto the centre with the sheet metal of metallic elastic component symmetric position, realizes
Temperature-compensating to the fiber grating for pressure measurement, reduces temperature to the influence for pressure measurement fiber grating so that
Pressure real-time measuring result is more accurate.
The present invention is a kind of lever fiber bragg grating pressure sensor, its basic principle measured to pressure：
The present invention using diaphragm and lever combination structure, lead to by the amount of deflection that the diaphragm with rigid central produces under pressure
Cross the elongation that lever construction is converted into metallic elastic component so that the optic fiber grating wavelength being pasted onto on metallic elastic component becomes
Change, the measurement to pressure is realized by the change of demodulating fiber bragg grating wavelength.
If metallic elastic diaphragm is being subject to the effective radius of vertical load to be R, its thickness is h, is stayed in outside lever through hole
Latch upper end radius be r, metallic elastic diaphragm must meet thin plate condition and small deflection condition.
Flexible sheet center amount of deflection with rigid central is：
Wherein, q-evenly load, μ-diaphragm Poisson's ratio, E-membrane flexive modulus, R-diaphragm effective radius, r-hard
Core radius
Latch is reduced to the rigid central of metallic elastic diaphragm lower end, and the flexible sheet center amount of deflection with rigid central is
The vertical displacement of latch.
Latch is directly connected to lever, then the downward displacement of generation is metallic elastic diaphragm vertical on the left of lever
Center amount of deflection under load action.
It can be obtained using the equilibrium principle and geometry deformation equation of lever：
Then
Wherein, l1- latch is to the distance of fulcrum, l2- fulcrum is to lever right end distance, the vertical position of Δ l-lever right end
Move
The elongation that metallic elastic component produces is consistent with the vertical displacement that lever right end produces, therefore, metallic elastic member
The strain of part is：
Fiber grating for pressure measurement is strained and the influence of temperature, i.e.,：
Wherein,- fiber grating strain sensitivity coefficient；αT1The temperature that-Temperature Sensitivity Coefficient of Fiber Bragg Gratings does not stress
It is only related with temperature to spend null grating center wavelength variation value, then：
ΔλB2=αT2·ΔT (5)
For same batch fiber grating, think within a certain error range
αT1=αT2 (6)
Then, the dependent variable of fiber grating generation is：
Due to being affixed directly to the center of metallic elastic steel disc for the fiber grating of pressure measurement, pressure survey thus be accordingly used in
The fiber grating of amount produces consistent strain stress relation, i.e. ε=ε with metallic elastic component1, then
Then for pressure measurement optic fiber grating wavelength changing value and pressure applied between theoretical relationship be：
Formula (9) is optic fiber grating wavelength drift value Δ λBWith the relational expression between structure pressure q.It can be seen from the above that can
To pass through the real-time monitoring for measuring the change of fiber bragg grating center wavelength to realize to pressure.
The present invention uses optical fiber grating sensing mechanism, using diaphragm and lever combination structure type, based on diaphragm small deflection
Theoretical and lever balance theory, with reference to the good characteristic of fiber grating, there is provided a kind of to adjust range and the lever of precision
Formula fiber bragg grating pressure sensor.Employed at the same time in the lever fiber bragg grating pressure sensor of the present invention for measuring pressure
Fiber grating and temperature compensation optical fiber grating, solve the problems, such as optical fiber grating temperature with strain cross sensitivity, realize pressure
Real-time accurate measurements.The lever fiber bragg grating pressure sensor structure type of the present invention is simple, easy to process, using stainless steel
Packed by metal casing, improves the durability of sensor, extends the service life of sensor, while has good anti-electromagnetism
Jamming performance, can be used for the real-time monitoring of the engineering structure health status such as bridge, road, dam.
Claims (3)
- A kind of 1. lever fiber bragg grating pressure sensor, it is characterised in that including：Metallic elastic diaphragm (1), latch (2), thick stick Bar (3), groove (4), metal ball (5), bearing (6), metallic elastic component one (7), the fiber grating (8) for measuring pressure, Metallic elastic component two (9), temperature compensation optical fiber grating (10), metal outer protective shell (11), reserving hole (12)；Metallic elastic diaphragm (1) surrounding is fixed at the top of the outer protective shell (11) of metal, and metallic elastic diaphragm (1) center is overlapped on slotting Sell at the top of (2), latch (2) top stop bit on lever (3), through the hole on the left of lever (3) arrange by latch (2) lower part；Lever (3) lower end is equipped with three grooves (4), and metal ball (5) upper end is held in a groove (4) of lever (3) bottom Portion, metal ball (5) lower end are abutted with bearing (6), and bearing (6) is fixed on outer protective shell (11) base of metal；Metallic elastic component one (7) is connected with lever (3) right end, metallic elastic component one (7) lower end is fixed in outside metal and protects On protective case (11) base；Fiber grating (8) for measuring pressure is pasted onto the center of metallic elastic component one (7), metallic elastic component two (9) it is correspondingly arranged at metallic elastic component one (7) outside metal in protective shell (11)；Temperature compensation optical fiber grating (10) is pasted In the center with metallic elastic component two (9)；Outer protective shell (11) bottom of metal is equipped with reserving hole (12).
- 2. lever fiber bragg grating pressure sensor according to claim 1, it is characterised in that：Groove (4) is ball-type groove, and it is internal that metal ball (5) upper end is held in one of groove (4).
- 3. lever fiber bragg grating pressure sensor according to claim 1, it is characterised in that：Latch (2) is thick for upper end, the thin hierarchic structure in lower end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710990945.6A CN107907252A (en) | 2017-10-23 | 2017-10-23 | A kind of lever fiber bragg grating pressure sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710990945.6A CN107907252A (en) | 2017-10-23 | 2017-10-23 | A kind of lever fiber bragg grating pressure sensor |
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| Publication Number | Publication Date |
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| CN107907252A true CN107907252A (en) | 2018-04-13 |
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| CN201710990945.6A Pending CN107907252A (en) | 2017-10-23 | 2017-10-23 | A kind of lever fiber bragg grating pressure sensor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109211302A (en) * | 2018-09-29 | 2019-01-15 | 北京菲斯罗克光电技术有限公司 | Calibration device, calibration system and the scaling method of naked FBG strain transducer |
| CN109238554A (en) * | 2018-10-26 | 2019-01-18 | 厦门大学 | Using the pressure sensor of fiber grating |
| CN110132467A (en) * | 2019-06-26 | 2019-08-16 | 蚌埠学院 | Fiber bragg grating pressure sensor |
| CN113280957A (en) * | 2021-04-16 | 2021-08-20 | 中山市精量光电子科技有限公司 | FBG pressure sensor based on diaphragm and flexible hinge lever mechanism |
| 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 |
| CN113405627A (en) * | 2021-06-10 | 2021-09-17 | 湖北工程学院 | Variable-range liquid level measuring method and device |
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| CN103017973A (en) * | 2013-01-05 | 2013-04-03 | 北京遥测技术研究所 | High-temperature resistant micropressure optical fiber grating sensor |
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| CN207610803U (en) * | 2017-10-23 | 2018-07-13 | 沈阳建筑大学 | A kind of lever fiber bragg grating pressure sensor |
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| CN1341208A (en) * | 1999-02-24 | 2002-03-20 | 西门子公司 | Bragg grating device for measuring mechanical force, utilization of said device and method for operating the same |
| CN101206150A (en) * | 2006-12-21 | 2008-06-25 | 中国科学院半导体研究所 | Optical fiber pressure sensor based on membrane deflection |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109211302A (en) * | 2018-09-29 | 2019-01-15 | 北京菲斯罗克光电技术有限公司 | Calibration device, calibration system and the scaling method of naked FBG strain transducer |
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| CN109238554A (en) * | 2018-10-26 | 2019-01-18 | 厦门大学 | Using the pressure sensor of fiber grating |
| CN110132467A (en) * | 2019-06-26 | 2019-08-16 | 蚌埠学院 | Fiber bragg grating pressure sensor |
| CN110132467B (en) * | 2019-06-26 | 2024-02-06 | 蚌埠学院 | Fiber grating pressure sensor |
| CN113280957A (en) * | 2021-04-16 | 2021-08-20 | 中山市精量光电子科技有限公司 | FBG pressure sensor based on diaphragm and flexible hinge lever mechanism |
| 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 |
| CN113405627A (en) * | 2021-06-10 | 2021-09-17 | 湖北工程学院 | Variable-range liquid level measuring method and device |
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