CN106482878B - A kind of adjustable optical fiber grating sensor - Google Patents
A kind of adjustable optical fiber grating sensor Download PDFInfo
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- CN106482878B CN106482878B CN201611066853.0A CN201611066853A CN106482878B CN 106482878 B CN106482878 B CN 106482878B CN 201611066853 A CN201611066853 A CN 201611066853A CN 106482878 B CN106482878 B CN 106482878B
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- optical fiber
- cursor
- grating
- cursors
- connector sleeve
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 80
- 239000000835 fiber Substances 0.000 claims description 6
- 238000005259 measurement Methods 0.000 abstract description 21
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 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
- G01L1/243—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 using means for applying force perpendicular to the fibre axis
- G01L1/245—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 using means for applying force perpendicular to the fibre axis using microbending
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a kind of adjustable optical fiber grating sensors, including grating, two cursors and connector sleeve, the grating is arranged between two cursors, the inside that the optical fiber of grating both ends connection distinguishes rotation swing arm enters inside cursor, is pierced by along straight line from the rear end end of cursor；The front end of cursor is hinged end, and hinged end is hinged with connector sleeve；Two cursor front ends offer pitch wheel respectively；It can relatively rotate between gear.The invention has the benefit that cursor is connected by gear using two groups of cursors, rub between gear small, relative rotation is unobstructed, and relative motion can occur for cursor stress, ensure that the sensitivity of measurement；Multiple groups optical fiber towing pad is arranged in cursor, and every group of optical fiber towing pad corresponds to a kind of magnification ratio, increase the measurement range of grating, improves the measurement accuracy of grating.
Description
Technical field
The present invention relates to sensing technology apparatus fields, and in particular to a kind of adjustable optical fiber grating sensor.
Background technique
Ordinary electronic class sensor acquisition precision is low, and vulnerable to electromagnetic interference, stability is poor, and number transmission loss is big, it is difficult to
Normal use in adverse circumstances.Fibre optical sensor overcomes the shortcomings that conditional electronic class sensor, can be compared with strong-electromagnetic field, corrosion
Etc. normal use in adverse circumstances or particular surroundings.
In fibre optical sensor field, the application prospect of fiber-optic grating sensor is very wide.Due to fiber-optic grating sensor
With electromagnetism interference, size small (standard bare fibre be 125um), light-weight, temperature tolerance, good (the operating temperature upper limit is up to 400
DEG C~600 DEG C), multiplexing capacity is strong, long transmission distance (sensor to demodulating end is up to several kilometers), corrosion-resistant, highly sensitive, nothing
The advantages that source device, easy deformation, was just applied successfully to the non-destructive testing of aerospace field early in 1988；Fiber grating passes
Sensor applies also for the every field such as chemical medicine, material industry, hydraulic and electric engineering, ship, coal mine, and leads in civil engineering
The concrete segment and structure of (such as building, bridge, dam, pipeline, tunnel, container, highway, airfield runway) in domain
In, to measure the integrality and internal strain state of structure, to establish smart architecture, and further realize intelligent building.So
And most of fiber-optic grating sensor sensitivity at present are inadequate, temperature measurement range is small.
Summary of the invention
It is an object of the present invention in view of the deficiencies of the prior art, provide a kind of high sensitivity, measurement range wide adjustable
Formula fiber-optic grating sensor.
The technical solution adopted by the present invention is that: a kind of adjustable optical fiber grating sensor, including grating, two cursors,
And connector sleeve, the grating are arranged between two cursors, the inside of the optical fiber difference rotation swing arm of grating both ends connection
Into inside cursor, it is pierced by along straight line from the rear end end of cursor；The front end of cursor be hinged end, hinged end with connect
Set is hinged；Two cursor front ends offer pitch wheel respectively；It can relatively rotate between gear.
According to the above scheme, correspondence offers multiple groups optical fiber towing pad along its length for the inside of two cursors, is rotating
The inside of arm is provided with the optical fiber traction channel being connected to optical fiber towing pad along its length, and the optical fiber at the grating both ends passes through respectively
The optical fiber towing pad of two cursors enters optical fiber traction channel, is pierced by from the rear end end of cursor.
According to the above scheme, the intersection in each optical fiber towing pad of the cursor and optical fiber traction channel is equipped with chamfering.
According to the above scheme, the rear end end of the cursor offers optical fiber fixing groove, draws from optical fiber traction channel
Optical fiber is fixed in optical fiber fixing groove.
According to the above scheme, bayonet is offered in the connector sleeve, the front end of the cursor is the concave station of indent, and concave station can
It is inserted into bayonet, concave station is hinged with connector sleeve；The bottom surface of two cursors and the bottom surface of connector sleeve are in the same plane.
According to the above scheme, two cursors are correspondingly arranged on four groups of optical fiber towing pads.
The invention has the benefit that
1, the present invention uses two groups of cursors, and cursor is connected by gear, and frictional force is small between gear, relatively rotates not
Interrupted, relative motion can occur for cursor stress, ensure that the sensitivity of measurement；
2, multiple groups optical fiber towing pad is arranged in cursor, and every group of optical fiber towing pad corresponds to a kind of magnification ratio, and such method increases
The big measurement range of grating, improves the measurement accuracy of grating；
3, adjusts the angle between two cursors and carries out stress compensation to grating application pretightning force, ensure that measurement essence
Degree.
4, the configuration of the present invention is simple, it is easy to operate.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of a specific embodiment of the invention.
Fig. 2 is the main view of Fig. 1.
Fig. 3 is the structural schematic diagram of cursor in the present embodiment.
Fig. 4 is the optical fiber towing pad of cursor and the structural schematic diagram in optical fiber traction channel.
Fig. 5 is the structural schematic diagram of rotational pin in the present embodiment.
Fig. 6 is the structural schematic diagram of connector sleeve in the present embodiment.
Fig. 7 is the structural schematic diagram of fiber grating in the present embodiment.
Fig. 8 is the application state schematic diagram of the present embodiment.
Fig. 9 is the stress diagram of structural beams in the present embodiment.
Wherein: 1, optical fiber；2, cursor；2.1, optical fiber towing pad；2.2, hinge hole；2.3, gear；2.4, optical fiber is drawn
Channel；3, grating；4, rotational pin；5, connector sleeve；6, structural beams.
Specific embodiment
For a better understanding of the present invention, the present invention is further described in the following with reference to the drawings and specific embodiments.
A kind of adjustable optical fiber grating sensor as shown in Figure 1, including grating 3, two cursors 2 and connector sleeves
5, grating 3 is arranged between two cursors 2, and the inside that the optical fiber 1 of 3 both ends of grating connection distinguishes rotation swing arm 2 enters rotation
Inside arm 2, and it is pierced by along straight line from the rear end end of cursor 2；The front end of cursor 2 is that (hinged end opens up hinged for hinged end
Connect hole 2.2), hinged end is hinged by rotational pin 4 and connector sleeve 5；Two 2 front ends of cursor offer intermeshing tooth respectively
Wheel 2.3；Good (friction is very small) is lubricated between two gears 2.3, relative rotation is unobstructed, and 2 stress of cursor can be sent out
Raw relative motion, ensure that the sensitivity of measurement.When the bottom surface stress of cursor 2, gear 2.3 is relatively rotated, 2 bottom of cursor
Strain amplify through cursor 2, magnification ratio can be calculated according to torque theory.
Correspondence offers multiple groups optical fiber towing pad 2.1 along its length for the inside of two cursors 2, in cursor 2
Portion is provided with the optical fiber traction channel 2.4 being connected to optical fiber towing pad 2.1 along its length, and the optical fiber 1 at 3 both ends of grating is distinguished
Optical fiber towing pad 2.1 through two cursors 2 enters optical fiber traction channel 2.4 and (optical fiber 1 is fixed on optical fiber fixing groove with glue
It is interior, guarantee between optical fiber 1 and optical fiber fixing groove without relative motion), and be pierced by from the rear end end of cursor 2.Due to optical fiber 1
Curvature cannot be too big, therefore the intersection in each optical fiber towing pad 2.1 of cursor 2 and optical fiber traction channel 2.4 carries out chamfering
Processing (avoids optical fiber 1 from bending excessive influence to work normally)；The rear end end of cursor 2 offers optical fiber fixing groove, and optical fiber is solid
Determining slot can be semicircle, and the optical fiber drawn from optical fiber traction channel 2.4 is fixed in optical fiber fixing groove, avoid 2 stress of cursor
When optical fiber 1 and optical fiber traction channel 2.4 occur relative motion and increase measurement error.
Bayonet is offered in connector sleeve 5, the front end of the cursor 2 is the concave station of indent, and concave station can be inserted into bayonet, recessed
Platform is hinged by connecting pin 4 and connector sleeve 5.When the sensor is fixed on object under test, fixed position is two cursors 2
Bottom surface and connector sleeve 5 bottom surface, the bottom surface of this three is in the same plane, it is ensured that the accurate transmission when object under test deforms
To the sensor.
In the present embodiment, two cursors 2 are correspondingly arranged on four groups of optical fiber towing pads 2.1, and four groups of optical fiber towing pads 2.1 are right
Four kinds of magnification ratios are answered, (stress of various environment has corresponding most suitable the measurement range and measurement accuracy for improving grating 3
Measurement accuracy is not that the higher the better for precision, should select magnification ratio according to the actual situation).The optical fiber 1 at 3 both ends of grating is corresponding
Enter from the optical fiber towing pad 2.1 of two cursors 2, such as A-a, B-b；Can not misplace connection, otherwise can cause measurement error, and
The deflection angle of optical fiber 1 spends the laser propagation effect for influencing optical fiber 1 greatly when dislocation connection.
Sensor of the present invention is in measurement process, and the rear end of cursor 2 is moved around rotational pin 4 when stress, forms
One simple mechanical model: a bar one end is hinged, and the other end of bar is rotated around hinge joint, remaining position is by altogether on bar
The effect of the power of two different locations in face.Using principle of moments, the ratio of two power is obtained according to the length of two cursors 2
Example, the magnification ratio (namely enhanced sensitivity principle of optical fiber encapsulation) that the present invention is obtained using this principle.Below with present invention measurement
Be illustrated for the stress condition of a certain position of structural beams 6, the both ends of structural beams 6 respectively byWithPulling force effect.
In the present embodiment, in order to exclude influence of the environment temperature to measurement result, stress compensation is carried out to grating 3；In addition, the present embodiment
Using fine grade, i.e. the optical fiber 1 at 3 both ends of grating enters from the B-b optical fiber towing pad 2.1 of two cursors 2.
Specific installation of the invention and measurement process are as follows:
Firstly, the sensor described in the location arrangements to be measured of structural beams 6, cursor 2 is pasted onto structural beams 6, adjust
Angle between two cursors 2, applying pretightning force progress stress compensation to grating 3, (variation of temperature and stress is total in environment
Be it is simultaneous, measure stress when have to exclude temperature interference), guarantee the grating 3 pasted be in stress to be measured become
Within the scope of change, and the stress that the raster size as caused by stress variation changes except stress range to be measured is pre-
Clamp force is offset, and thus the sensor optimum measurement range is fully utilized, and stress to be measured is located within the scope of optimum measurement, is protected
Measurement accuracy is demonstrate,proved；
Then, each component of the sensor is pasted onto the detected part of structural beams 6, and guarantees two cursors 2
Bottom surface and the bottom surface of connector sleeve 5 are in the same plane, and are bonded completely with the tested surface of structural beams 6,6 stress deformation of structural beams
It can be accurately transfer on the sensor；
Finally, being demarcated to the mounted sensor, and each component is pasted onto structural beams 6, connects demodulation
Instrument measures.
As shown in Figure 8 and Figure 9,The external pull being subject in structural beams 6 for the sensor；WithRespectively
Along 2 length direction of cursor and perpendicular to two component on 2 length direction of cursor；β isWithBetween angle；The pulling force being transmitted to after being amplified for external pull by cursor 2 on grating 3,WithRespectivelyLong along cursor 2
It spends on direction and perpendicular to two component on cursor direction, α isWithBetween angle.
It can be calculated using following formulaWithSize relation:
Wherein O is the center of rotation of cursor, and A, B are respectivelyWithStress point on cursor 2, OA, OB difference
ForWithIn the stress point on cursor to the distance between center of rotation O.
Finally it should be noted that these are only the preferred embodiment of the present invention, it is not intended to restrict the invention, although
Referring to embodiment, invention is explained in detail, for those skilled in the art, still can be to aforementioned
Technical solution documented by each embodiment is modified or equivalent replacement of some of the technical features, but it is all
Within the spirit and principles in the present invention, any modification, equivalent replacement, improvement and so on should be included in protection of the invention
Within the scope of.
Claims (6)
1. a kind of adjustable optical fiber grating sensor, which is characterized in that described including grating, two cursors and connector sleeve
Grating is arranged between two cursors, and the inside that the optical fiber of grating both ends connection distinguishes rotation swing arm enters inside cursor,
It is pierced by along straight line from the rear end end of cursor；The front end of cursor is hinged end, and hinged end is hinged with connector sleeve；Two rotations
Arm front end offers pitch wheel respectively；It can relatively rotate between two gears.
2. adjustable optical fiber grating sensor as described in claim 1, which is characterized in that the interior lateral edge length of two cursors
Direction correspondence offers multiple groups optical fiber towing pad, is provided with the light being connected to optical fiber towing pad along its length in the inside of cursor
Fibre traction channel, it is logical that the optical fiber at the grating both ends enters optical fiber traction through the corresponding optical fiber towing pad of two cursors respectively
Road is pierced by from the rear end end of cursor.
3. adjustable optical fiber grating sensor as claimed in claim 2, which is characterized in that each optical fiber of the cursor is led
The intersection in pilot hole and optical fiber traction channel is equipped with chamfering.
4. adjustable optical fiber grating sensor as claimed in claim 2, which is characterized in that open the rear end end of the cursor
Equipped with optical fiber fixing groove, the optical fiber drawn from optical fiber traction channel is fixed in optical fiber fixing groove.
5. adjustable optical fiber grating sensor as described in claim 1, which is characterized in that offer card in the connector sleeve
Mouthful, the front end of the cursor is the concave station of indent, and concave station can be inserted into bayonet, and concave station is hinged with connector sleeve；Two cursors
Bottom surface and the bottom surface of connector sleeve be in the same plane.
6. adjustable optical fiber grating sensor as described in claim 1, which is characterized in that two cursors are correspondingly arranged on four
Group optical fiber towing pad.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611066853.0A CN106482878B (en) | 2016-11-25 | 2016-11-25 | A kind of adjustable optical fiber grating sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611066853.0A CN106482878B (en) | 2016-11-25 | 2016-11-25 | A kind of adjustable optical fiber grating sensor |
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| CN106482878A CN106482878A (en) | 2017-03-08 |
| CN106482878B true CN106482878B (en) | 2019-03-08 |
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| CN201611066853.0A Expired - Fee Related CN106482878B (en) | 2016-11-25 | 2016-11-25 | A kind of adjustable optical fiber grating sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110375663B (en) * | 2019-08-08 | 2021-04-23 | 北京航空航天大学合肥创新研究院 | Fiber grating strain measuring device with adjustable measuring range |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6337737B1 (en) * | 2001-03-09 | 2002-01-08 | Ciena Corporation | Fiber-Bragg-grating-based strain measuring apparatus, system and method |
| CN101576422A (en) * | 2009-06-18 | 2009-11-11 | 山东省科学院激光研究所 | Optical fiber grating anchor stress sensor |
| CN105890534A (en) * | 2015-01-19 | 2016-08-24 | 中国计量学院 | High-temperature pressure pipeline outer wall strain guide rod fiber grating sensing device |
| CN105890532A (en) * | 2014-12-25 | 2016-08-24 | 中国计量学院 | Two-level lever transmission-based fiber grating strain sensibilization device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203100682U (en) * | 2013-02-28 | 2013-07-31 | 永大科技集团有限公司 | Fiber grating displacement sensor with adjustable sensitivity |
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- 2016-11-25 CN CN201611066853.0A patent/CN106482878B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6337737B1 (en) * | 2001-03-09 | 2002-01-08 | Ciena Corporation | Fiber-Bragg-grating-based strain measuring apparatus, system and method |
| CN101576422A (en) * | 2009-06-18 | 2009-11-11 | 山东省科学院激光研究所 | Optical fiber grating anchor stress sensor |
| CN105890532A (en) * | 2014-12-25 | 2016-08-24 | 中国计量学院 | Two-level lever transmission-based fiber grating strain sensibilization device |
| CN105890534A (en) * | 2015-01-19 | 2016-08-24 | 中国计量学院 | High-temperature pressure pipeline outer wall strain guide rod fiber grating sensing device |
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