CN106382894B - A kind of fiber grating multidimensional sensor - Google Patents
A kind of fiber grating multidimensional sensor Download PDFInfo
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- CN106382894B CN106382894B CN201610993770.XA CN201610993770A CN106382894B CN 106382894 B CN106382894 B CN 106382894B CN 201610993770 A CN201610993770 A CN 201610993770A CN 106382894 B CN106382894 B CN 106382894B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
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Abstract
The invention belongs to sensor technical fields, and in particular to a kind of fiber grating multidimensional sensor.A kind of fiber grating multidimensional sensor, including composite material packaged fiber grating sensor 1, each composite material packaged fiber grating sensor are fixed on angle steel 3 by L-type support 2.Fiber grating multidimensional strain transducer provided by the present invention, with it is existing based on the multidimensional strain transducer of resistance strain gage group bridge measuring principle compared with, have high reliablity, the advantages such as strong antijamming capability.
Description
Technical field
The invention belongs to sensor technical fields, and in particular to a kind of fiber grating multidimensional sensor.
Background technique
With the development of the city, the various outdoor structures of large size are increasing.Civil infrastructure for example bridge, skyscraper,
The Gernral Check-up and safety monitoring of the network systems such as large-span space structure, dam, nuclear power station, transmission of electricity, oil transportation are always the country
The important subject of outer engineering field extensive concern.Its routine techniques mostly in a manner of point type electrical measurement fax based on, but these skills
Art haves the defects that essence, such as influence to measuring point physical property；Durability is poor；It is interfered vulnerable to strong-electromagnetic field；Survey cannot be distributed
Measure, cause information content limited etc..
Using fiber bragg grating as the sensor of core with have high sensitivity, wide dynamic range, not by electromagnetic interference,
High reliablity, it is small in size the advantages that.Facilitate realization to bridge, dam, aircraft, naval vessel, the real-time monitoring of oil well etc., light at present
Fiber grating sensing technique using more and more extensive.Fiber Bragg grating strain sensor is most widely used in engineering field, skill
The most mature fibre optical sensor of art.It since fiber grating is more fragile, is very easy to destroy in a bad working environment, thus needs
Could be used after being packaged to it, meanwhile, the design variation of encapsulating structure again can the parameters such as sensitivity to sensor into
Row optimization improvement.
According to the Fiber-optic Bragg Grating of R.Maaskant, T.Alavie and G.Tadros et al.
The text of Sensors for Bridge Monitoring mono-, early in 1993, the Beddingtontrail of Canada Calgary
Bridge has used fiber grating to carry out stress measurement first, and with the method long term monitoring bridge structure.Fiber-optic grating sensor
Application in engineering structure is the test after electric detecting technology
The beginning of technology new stage, the development of the technology will provide new side for the safety monitoring of civil infrastructure
Method and means.
Traditional multidimensional strain transducer is mostly designed, resistance strain gage based on resistance strain gage group bridge measuring principle
It is influenced by temperature, humidity, electromagnetic interference big, it is difficult to the monitoring under competent field complex environment.And in comparison, light
Fiber grating sensor can then be competent at this monitoring completely.
Existing fiber Bragg grating strain sensor, such as the utility model patent " one of 202158841 U of Authorization Notice No. CN
Kind fiber Bragg grating strain sensor ", needs for sensor to be pasted on testee, high to testee surface requirements, sensing
Device can not reuse, and the sensitivity of sensor is affected by the performance of glue, and colloid is also easy aging, in service life
And have certain limitation in use scope.A kind of utility model patent " three-dimensional fiber light of 203587254 U of Authorization Notice No. CN
Gate sensor " is applicable only to measurement crustal stress, and application range is very narrow, and sensor structure is complex, and production has certain difficulty
Degree, while the sensor has used 9 fiber gratings, data amount of analysis is big, intuitively spends low.
Summary of the invention
The purpose of the present invention is to provide a kind of novel fiber grating multidimensional sensors.
The object of the present invention is achieved like this:
A kind of fiber grating multidimensional sensor, including composite material packaged fiber grating sensor 1, each composite material envelope
Dress fiber-optic grating sensor is fixed on angle steel 3 by L-type support 2.
There are three the composite material packaged fiber grating sensors 1, three composite material packaged fiber grating sensings
Device is located in three different sides of the same circumferential position of angle steel, and relative position on each face is all different.
Composite material packaged fiber grating sensor installation direction described in three is parallel with the length direction of angle steel 3.
1 both ends of composite material packaged fiber grating sensor are equipped with metal anchor head, and each composite material encapsulates light
Fiber grating sensor is fixed on angle steel 3 by 2 L-type supports.
Connection type between the L-type support 2 and angle steel 3 is rigid connection, and L-type support 2 is equipped with mounting hole, with
Composite material packaged fiber grating sensor 1 is rigidly connected.
The angle steel 3 uses equal leg angle.
The beneficial effects of the present invention are:
Fiber grating multidimensional strain transducer provided by the present invention, with existing based on resistance strain gage group bridge measurement original
The multidimensional strain transducer of reason is compared, and has high reliablity, the advantages such as strong antijamming capability.
Fiber grating multidimensional strain transducer provided by the present invention, with other existing fiber grating multidimensional strain sensings
Device is compared, have structure it is simple, can Reusability, have a wide range of application, testee pattern do not required, use sensitivity member
The advantages such as part is few.
Detailed description of the invention
Fig. 1 is sensor of the invention overall structure diagram；
Fig. 2 is sensor of the invention overall structure front view；
Fig. 3 is sensor of the invention overall structure side view；
Fig. 4 is sensor of the invention overall structure top view；
Fig. 5 is L-type support structural schematic diagram of the invention；
Fig. 6 is composite material packaged fiber grating sensor structural schematic diagram of the invention；
Fig. 7 be angle steel in X direction continuous deformation when, three fiber grating sensor wavelengths drift about schematic diagrames；
When Fig. 8 is that certain quantitative deformation occurs in X direction for angle steel, three fiber grating sensor wavelengths drift schematic diagrames；
Fig. 9 be angle steel along Y-direction continuous deformation when, three fiber grating sensor wavelengths change schematic diagrames；
When Figure 10 is that along Y-direction certain quantitative deformation occurs for angle steel, three fiber grating sensor wavelengths drift schematic diagrames；
Figure 11 be angle steel along Z-direction continuous deformation when, three fiber grating sensor wavelengths drift about schematic diagrames；
When Figure 12 is that along Z-direction certain quantitative deformation occurs for angle steel, three fiber grating sensor wavelengths drift schematic diagrames；
Figure 13 be angle steel about the z axis continuous rotation when, three fiber grating sensor wavelengths drift about schematic diagrames；
Figure 14 is angle steel when continuous rotation quantifies angle about the z axis, and three fiber grating sensor wavelengths drift about schematic diagrames.
Specific embodiment
The present invention is described further with reference to the accompanying drawing.
The present invention relates to a kind of for measuring the fiber grating multidimensional strain transducer of large scale structure strain.The fiber grating
Multidimensional strain transducer, including three composite material packaged fiber grating sensors, six L-type supports and an angle steel.It is each
A composite material packaged fiber grating sensor is fixed on angle steel by two L-type supports, three composite material packaged fibers
Grating sensor is separately fixed on angle steel different sides different location.Due to angle steel Strain Distribution characteristic itself and this sensor knot
Structure characteristic, three sensors are insensitive to the strain of a direction or certain two direction respectively, when use by three groups of data into
The strain size of the available measured structure of row comparative analysis and direction.The present invention can be fixed on a variety of large scale structures by fixture
On, it is widely used, real-time, long-term, effective monitoring can be carried out.
The present invention provides a kind of fiber grating multidimensional strain transducers for large scale structure strain detecting.Angle steel conduct
A part of encapsulating structure, one end are fixed in measured structure, and one end is fixed in fixed pan (such as ground) or structure.When
When measured structure changes, angle steel deforms, to drive Prague light between the L-type support being rigidly fixed on angle steel
Grid are stretched (compression), and bragg wavelength is made to drift about.Fiber Bragg grating strain sensor measurement is based on measured structure
The variation of screen periods and effective refractive index caused by changing, so as to cause the variation of spectra features wavelength, by measuring feature
The drift value of wavelength measures measured structure dependent variable.
The technical solution of the present invention is as follows: a kind of novel fiber grating multidimensional strain transducer, including composite material encapsulation
Fiber-optic grating sensor, L-type support, angle steel.3 composite material packaged fiber grating sensors are fixed by 6 L-type supports respectively
In three different sides of the same circumference of angle steel, circumferential position is close to angle steel wherein one end.Angle steel encapsulates light apart from composite material
One end that fiber grating sensor is closer is connect as fixing end with fixed pan or structural rigidity, and the other end passes through fixture
It is rigidly connected with measured structure.When deformation occurs for measured structure, driving angle steel, deformation occurs, so that fixing composite material encapsulates
Two L-type supports of fiber-optic grating sensor relatively move, and enable and encapsulating with the rigidly connected composite material of two L-type supports
Fiber-optic grating sensor generates strain.Due to the Strain Distribution characteristic of angle steel itself and the architectural characteristic of this sensor, three multiple
Condensation material packaged fiber grating sensor is respectively to level, vertically, reverses, one in the strain of stretching/compressing four direction
Or two insensitive.Strain size and direction by the more available measured structure to three groups of measurement data.
The structure of the composite material packaged fiber grating sensor includes fiber bragg grating, FRP material and anchor head,
Fiber bragg grating is encapsulated in cylindrical FRP material center vertically, and FRP material both ends are connect with anchor head.
Below by specific embodiment combination attached drawing, invention is further described in detail.The present invention can be with a variety of
Different forms is realized, however it is not limited to embodiment described in the present embodiment.The purpose of following specific embodiments is provided
It is easy for becoming apparent from the present invention thorough explanation, wherein the indicating positions direction such as upper and lower, left and right, level, vertical, torsion
For words is only the position for shown structure in respective figure.
However, those skilled in the art may be aware that the detail description of wherein one or more can be saved
Slightly, or can also adopt with other methods, component or material.In some instances, some embodiments be not described or
There is no detailed description.
In addition, the technical characteristic recorded in the present invention, technical solution can also be in one or more embodiments with any
Suitable mode combines.
Embodiment:
Fiber grating multidimensional strain transducer includes main structure and composite material packaged fiber grating sensor.
As shown in Fig. 2, this sensor includes angle steel 3, the first L-type support, the second L-type support, third L-type support is compound
Material package fiber-optic grating sensor 5, composite material packaged fiber grating sensor 6, composite material packaged fiber grating sensing
Device 7.
Angle steel uses Q235 ∠ 40 × 40 × 3.Length 2000mm.
First L-type support is apart from angle steel upper space 10mm.Second L-type support is apart from the most right surface 26mm of angle steel.3rd L
Type bracket is apart from the most right surface 26mm of angle steel.
Such as Fig. 2, mark in Fig. 3, Fig. 4, angle steel has orthogonal first axis, the second axial and third axial direction shape
At three-dimensional system of coordinate (i.e. using the left side right-angled apices of angle steel as origin O define an XYZ three-dimensional system of coordinate).
Such as Fig. 3, shown in Fig. 4, the first L-type support, the second L-type support, the most right plan range angle steel right end of third L-type support
865mm.Composite material packaged fiber grating sensor 5, composite material packaged fiber grating sensor 6, composite material encapsulate light
Fiber grating sensor 7 is parallel with Z axis.
Hole location is equipped at each 200mm in angle steel left and right ends, to install fixed fixture.Clamp-shaped can be according to quilt
It surveys object appearance and is designed modification, do not influence this sensor normal use.Wherein angle steel right end is fixing end, when use with it is solid
Face or structural rigidity connection are allocated, angle steel left end is measurement end, is rigidly connected with testee.
As shown in figure 5, L-type support bed-plate dimension is 20*47mm, thick 6mm, overall height 30mm.Open one in upper surface center
Mounting hole with composite material packaged fiber grating sensor to be rigidly connected.Bore dia 6mm, deep (L-type support upper surface are installed
To the center of circle) 16.5mm.
As shown in fig. 6, the composite material packaged fiber grating sensor includes fiber bragg grating 8, FRP encapsulating material
9, anchor head 10.The long 100mm of FRP encapsulating material, left and right anchor head each long 18mm, diameter 6mm.
The sensitive detection element of inventive sensor is fiber grating, arranges fiber grating on the specific position of angle steel
Afterwards, angle steel strain size is characterized using the wavelength output of fiber grating, to obtain the strain size of testee.
Due to the Strain Distribution characteristic and architectural characteristic of the invention of angle steel itself, composite material packaged fiber grating sensing
Device 5, composite material packaged fiber grating sensor 6, composite material packaged fiber grating sensor 7 distinguish diagonal steel along X axis
Bending is bent along Y-axis, and along Z axis to stretching/compressing, it is unwise to rotate one or two of strain of four direction about the z axis
Sense, analyzes the wavelength shift of three composite material packaged fiber grating sensors, it can be determined that go out should changing direction for angle steel, from
And judge should changing direction for measured structure.
The wavelength shift of composite material packaged fiber grating sensor 5 is △ λ1。
The wavelength shift of composite material packaged fiber grating sensor 6 is △ λ2。
The wavelength shift of composite material packaged fiber grating sensor 7 is △ λ3。
Wavelength throughput rate goes out to subtract under original state (after applying prestressing force) wavelength output quantity after wavelength shift is equal to deformation,
The positive and negative grating that respectively represents is stretched and compresses.
Such as Fig. 7, shown in Fig. 8, when angle steel occurs under the traction of testee along X axis Bending Deformation, composite material
Packaged fiber grating sensor 6 and the output of 7 wavelength of composite material packaged fiber grating sensor vary less, composite material encapsulation
The output of 5 wavelength of fiber-optic grating sensor has a large change, and 5 wavelength shift of composite material packaged fiber grating sensor and multiple
Condensation material packaged fiber 7 wavelength shifts of grating sensor are positive and negative opposite.
Such as Fig. 9, shown in Figure 10, when angle steel occurs under the traction of testee along Y-axis Bending Deformation, composite material
Packaged fiber grating sensor 5 and the output of 6 wavelength of composite material packaged fiber grating sensor vary less, composite material encapsulation
The output of 7 wavelength of fiber-optic grating sensor has large change.And 5 wavelength shift of composite material packaged fiber grating sensor and multiple
Condensation material packaged fiber 7 wavelength shifts of grating sensor are positive and negative opposite.
Such as Figure 11, shown in Figure 12, when angle steel occur under the traction of testee along Z axis to stretching/compressing when, it is compound
The output variation of 5 wavelength of material package fiber-optic grating sensor is maximum, and the output of 6 wavelength of composite material packaged fiber grating sensor becomes
Change placed in the middle, 7 wavelength of composite material packaged fiber grating sensor output variation minimum, and three wavelength shifts are positive and negative consistent.
Such as Figure 13, shown in Figure 14, when angle steel occurs to rotate about the z axis under the traction of testee, composite material is encapsulated
The wave of fiber-optic grating sensor 5, composite material packaged fiber grating sensor 6 and composite material packaged fiber grating sensor 7
Long output changes, and three wavelength shift sizes are almost the same, and three wavelength shifts are positive and negative consistent.
As it can be seen that should change direction for four kinds, three wavelength shifts are different, and comparing three data by analysis can be with
Should changing direction for angle steel is obtained, to obtain should changing direction for testee.
The above content is specific embodiment is combined, further detailed description of the invention, and it cannot be said that this hair
Bright specific implementation is only limited to these instructions.For those skilled in the art to which the present invention belongs, this is not being departed from
Under the premise of inventive concept, several deduction or replace can also be made.
Claims (4)
1. a kind of fiber grating multidimensional sensor, including composite material packaged fiber grating sensor (1), it is characterised in that: every
A composite material packaged fiber grating sensor is fixed on angle steel (3) by L-type support (2)；
There are three the composite material packaged fiber grating sensors (1), three composite material packaged fiber grating sensors
In three different sides of the same circumferential position of angle steel, relative position on each face is all different；
Composite material packaged fiber grating sensor installation direction described in three is parallel with the length direction of angle steel (3).
2. a kind of fiber grating multidimensional sensor according to claim 1, it is characterised in that: the composite material encapsulation
Fiber-optic grating sensor (1) both ends are equipped with metal anchor head, and each composite material packaged fiber grating sensor is by 2 L-type supports
It is fixed on angle steel (3).
3. a kind of fiber grating multidimensional sensor according to claim 1, it is characterised in that: the L-type support (2) with
Connection type between angle steel (3) is rigid connection, and L-type support (2) is equipped with mounting hole, with composite material packaged fiber grating
Sensor (1) rigid connection.
4. a kind of fiber grating multidimensional sensor according to claim 1, it is characterised in that: the angle steel (3) uses
Equal leg angle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610993770.XA CN106382894B (en) | 2016-11-09 | 2016-11-09 | A kind of fiber grating multidimensional sensor |
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| CN201610993770.XA CN106382894B (en) | 2016-11-09 | 2016-11-09 | A kind of fiber grating multidimensional sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106767689A (en) * | 2017-03-06 | 2017-05-31 | 沈阳建筑大学 | A kind of wedge structure fiber grating dislocation meter |
| CN111157155A (en) * | 2020-01-16 | 2020-05-15 | 电子科技大学 | Substrate for three-dimensional solid sensor, sensor and calibration method thereof |
| CN111272327B (en) * | 2020-03-17 | 2021-08-24 | 国网河南省电力公司电力科学研究院 | Fiber grating three-dimensional tension sensor |
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