CN104279973B - A kind of wide range fiber grating strain transducer - Google Patents
A kind of wide range fiber grating strain transducer Download PDFInfo
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- CN104279973B CN104279973B CN201410505524.6A CN201410505524A CN104279973B CN 104279973 B CN104279973 B CN 104279973B CN 201410505524 A CN201410505524 A CN 201410505524A CN 104279973 B CN104279973 B CN 104279973B
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Abstract
A kind of wide range fiber grating strain transducer, wide range strain measurement is realized by effective ways of the invention.Above-mentioned fiber Bragg grating strain sensor includes fiber grating, and enclosed chip protects sleeve pipe；The fiber grating is fixed with the enclosed chip with adhesive means；Protection sleeve pipe and the gluing fixation of the enclosed chip.Enclosed chip is integrally formed, and is segmented into three regions：It is clamped, spring structure, all-wing aircraft.The present invention is easily installed, clamped point on enclosed chip can be brought into close contact by bonding method with measured surface, the strain of measured surface after the unique design of enclosed chip by passing to fiber grating, the reflection wavelength of fiber grating is set to change, by the change for monitoring wavelength, you can obtain the change of measured surface strain.Strain range of the invention can reach 18000 μ ε.
Description
Technical field
The present invention relates to a kind of wide range fiber grating strain transducer, 18000 are can apply toμε even more wide ranges
Strain measurement.
Background technology
Fiber Bragg grating strain sensor is a kind of range of application Fibre Optical Sensor widely.When fiber grating strain hair
During changing, the material of optical fiber is influenceed that drifting about for resonance wavelength, resonance wave can be caused by grid cycle length and elasto-optical effect
Personal attendant strains linear change.Detection wavelength is the strain information that can obtain surface to be measured.Sensitivity of the wavelength shift to straining
And measurement range is closely related with encapsulating structure.
In some surface strain measurement process, it is desirable to which the measurement range of strain transducer is very big, ten thousand grades of microstrains are reached,
And it is required that Distributed Multi is measured, and winding displacement is succinct, demodulated equipment compact.Traditional resistance strain gage and normal light
Fiber grating sensor is difficult to meet demand.
The content of the invention
Technology solve problem of the invention is：In view of the shortcomings of the prior art, the invention provides one kind for big strain
The fiber Bragg grating strain sensor of range, small volume is lightweight, it is easy to install.
Technical solution of the invention is：
A kind of wide range fiber grating strain transducer, including：Fiber grating, enclosed chip and protection sleeve pipe；
Enclosed chip is processed by whole piece rectangle stainless steel, is integrally formed, and enclosed chip includes three parts, point
It is not：Clamped point, spring structure and all-wing aircraft；Two clamped points are located at the both sides of spring structure respectively, respectively with spring structure
Both sides connect, and two all-wing aircrafts are located at two outsides of clamped point respectively；Clamped dot thickness is more than the thickness of spring structure and all-wing aircraft,
Clamped point is raised with respect to spring structure and all-wing aircraft, and coating viscose glue on the bossing passes the wide range fiber grating strain
Sensor is pasted on a mounting surface so that have space between all-wing aircraft and installation surface；It is described when installation surface is deformed upon
There is elastic deformation in the spring structure of strain transducer, it is to avoid enclosed chip occurs plastic deformation or breaks therewith；
Groove is provided with along long side direction on enclosed chip, fiber grating passes through and fiber grating and the groove from the groove
There are two gluing fixing points, the part that fiber grating is located at outside the enclosed chip is cased with protection sleeve pipe and is protected.
The fiber grating is Fiber Bragg Grating FBG, and the protection sleeve pipe is resin material, and external diameter is 0.9mm.
The distance between fiber grating and two gluing fixing points of groove LAThe distance between point clamped with two LB
Between meet following relational expression：LA/LB>≥εB/εA, εBIt is the range of the fiber Bragg grating strain sensor, εAIt is the optical fiber
The maximum strain value of grating tolerance.
The fiber grating uses epoxy glue with the groove bonding.
The fiber grating and the groove are Nian Jie including hot setting and normal temperature cure two ways by epoxy glue, institute
It refers to be solidified under higher than 80 DEG C of environment to state hot setting, and normal temperature cure refers to be solidified in the range of room temperature.
During using hot setting mode, if pre- between the fiber grating and two gluing fixing points of the groove
When clamp force is 2N-2.5N, the operating temperature range of the fiber Bragg grating strain sensor is -40 DEG C to 120 DEG C；If the light
When pretightning force between fine grating and two gluing fixing points of the groove is 1.5N-2N, the fiber grating strain sensor
The operating temperature range of device is 0 DEG C to 120 DEG C；
During using normal temperature cure mode, if pre- between the fiber grating and two gluing fixing points of the groove
When clamp force is 1N-2N, the operating temperature range of the fiber Bragg grating strain sensor is -40 DEG C to 120 DEG C；If the optical fiber
When pretightning force between grating and two gluing fixing points of the groove is 0.5N-1N, the fiber Bragg grating strain sensor
Operating temperature range be 0 DEG C to 120 DEG C.
The present invention has the following advantages that compared with prior art：
(1) fiber-optic grating sensor encapsulating structure of the invention employs the design of desensitization, so that range extension scope, surpasses
Cross existing fiber Bragg grating strain sensor.Encapsulating structure is integrally formed, and sensor production is simple, easy for installation.
(2) the distance between fiber grating and two gluing fixing points of the groove LABetween point clamped with two away from
From LB, εBIt is the range of the fiber Bragg grating strain sensor, εAIt is the maximum strain value of fiber grating tolerance, by letter
Single principle LA/LB≥εB/εA, design LAOr LBLength just can by the range of sensor be extended to fiber grating tolerance should
The several times of variable.
(3) if the pretension by changing between the fiber grating and two gluing fixing points of groove of the invention
Power, thus it is possible to vary corresponding senor operating temperature scope.The different condition of cure of epoxy glue coordinates different pretightning forces, can be with
The different temperature range of design sensor is selected for user.
Brief description of the drawings
Fig. 1 is sensor construction schematic diagram, wherein, Fig. 1 (a) is sensor front schematic view, and Fig. 1 (b) is carried on the back for sensor
Face schematic diagram；
Fig. 2 is the first spring structure schematic diagram；
Fig. 3 is second spring structure schematic diagram；
Fig. 4 is enclosed chip structural representation of the present invention；
Fig. 5 is response schematic diagram of No. 6 samples of inventive sensor to strain.
Specific embodiment
The present invention is described further with reference to accompanying drawing just below.
As shown in Fig. 1 (a), Fig. 1 (b), the invention provides a kind of wide range fiber grating strain transducer, including：Light
Fine grating 1, enclosed chip 2 and protection sleeve pipe 3；
Enclosed chip 2 is processed by the material of whole piece rectangle stainless steel 301, is integrally formed, and enclosed chip 2 includes three
Individual part, respectively：Clamped point 22, spring structure 21 and all-wing aircraft 23；Two clamped points 22 are respectively positioned at the two of spring structure 21
Side, respectively the both sides with spring structure 21 be connected, two all-wing aircrafts 23 are located at two outsides of clamped point 22 respectively；Clamped point 22 is thick
, more than spring structure 21 and the thickness of all-wing aircraft 23, clamped point 22 is raised with respect to spring structure 21 and all-wing aircraft 23, in the lug boss for degree
Upper coating viscose glue is divided to paste on a mounting surface the wide range fiber grating strain transducer so that all-wing aircraft 23 and installation table
There is space between face, can be that the installation of protective case pipe reserves corresponding space, it is to avoid sensing is caused after installation of guard sleeve
Device both sides tilt；When installation surface is deformed upon, there is elastic deformation, bullet in the spring structure 21 of the strain transducer therewith
Spring structure can make big strained situation reduce stress suffered by spring structure when occurring, it is to avoid enclosed chip 2 occur plastic deformation or
Break or the situation of degumming occurs in clamped point；Spring structure has various patterns, may be referred to it is shown shown in Fig. 2 and Fig. 3, according to not
With strain range select the spring of varying strength.
Groove is provided with along long side direction on enclosed chip 2, is used to protect fiber grating 1, fiber grating 1 to be passed through from the groove
Cross and fiber grating 1 there are two gluing fixing points with the groove, fiber grating 1 is located at the part set outside the enclosed chip 2
There is protection sleeve pipe 3 to be protected.
The fiber grating 1 is Fiber Bragg Grating FBG, and the protection sleeve pipe 3 is resin material, and external diameter is 0.9mm.
The distance between fiber grating 1 and two gluing fixing points of groove LABetween point 22 clamped with two away from
From LBBetween meet following relational expression：LA/LB>≥εB/εA, εBIt is the range of the fiber Bragg grating strain sensor, εAFor described
The maximum strain value of the tolerance of fiber grating 1.
The fiber grating 1 uses epoxy glue with the groove bonding.Fiber grating 1 passes through Wear Characteristics of Epoxy Adhesive with the groove
Connect including hot setting and normal temperature cure two ways, the hot setting refers to be solidified under higher than 80 DEG C of environment, often
Temperature solidification refers to be solidified in the range of room temperature.
During using hot setting mode, if between the fiber grating 1 and two gluing fixing points of the groove
When pretightning force is 2N-2.5N, the operating temperature range of the fiber Bragg grating strain sensor is -40 DEG C to 120 DEG C；If described
When pretightning force between fiber grating 1 and two gluing fixing points of the groove is 1.5N-2N, the fiber grating strain is passed
The operating temperature range of sensor is 0 DEG C to 120 DEG C；
During using normal temperature cure mode, if between the fiber grating 1 and two gluing fixing points of the groove
When pretightning force is 1N-2N, the operating temperature range of the fiber Bragg grating strain sensor is -40 DEG C to 120 DEG C；If the light
When pretightning force between fine grating 1 and two gluing fixing points of the groove is 0.5N-1N, the fiber grating strain sensor
The operating temperature range of device is 0 DEG C to 120 DEG C.
Fiber Bragg grating strain sensor operation principle of the invention is as follows：
Assuming that the strain of object under test is ε, the clamped point of sensor is pasted onto surface to be measured, and strain in axial direction has
εB=ε=Δ L/LB
Wherein Δ L is the length change between clamped point, LBIt is the length between clamped point.
The strain being carried on grating is
εA=Δ L/LA
Wherein LAIt is the distance between bonding fiber point, Δ L is the length change of optical fiber, is equal to the length between clamped point
Degree change.
Then the strain suffered by fiber grating itself is unequal with the strain of testee, desensitization εB/εA=LA/LBTimes.
Therefore we are by designing the ratio of clamped length of optical fiber viscose glue point length and encapsulating structure, it is possible to control optical fiber
The multiple of sensor desensitization, while being also the expansion multiple of range.
Optic fiber grating wavelength drift delta λBRelation with strain and temperature change is as follows：
ΔλB=λB[(1-pe)Δε+(αΛ+αn)ΔT]
=λBSεΔε+λBSTΔT
Wherein, Section 1 represents the strain effect of optical fiber, peIt is elasto-optical coefficient, Section 2 represents the shadow of temperature on fiber
Ring, αΛIt is the coefficient of expansion of fiber optic materials, it is negligible because its drift value influence on optical grating reflection wavelength is smaller.Light
The change of fine grating Bragg wavelength and strain and linear (or substantially linear) relation of environmental change, by detection fiber light
Grid Bragg wavelength, it is possible to measure strain or environment temperature.The clamped point of sensor is affixed on surface to be measured, coordinates temperature to mend
Sensor is repaid, the sensor that we design can obtain the dependent variable on surface to be measured.
Fiber-optic grating sensor encapsulating structure of the invention employs the design of desensitization, so that range extension scope, exceedes
Existing fiber Bragg grating strain sensor.Encapsulating structure is integrally formed, and sensor production is simple, easy for installation.
The present invention is by simple principle LA/LB≥εB/εA, design LAOr LBLength just can be by the range of sensor
It is extended to the several times that fiber grating tolerates dependent variable.
If the pretightning force by changing between the fiber grating and two gluing fixing points of groove of the invention, can
To change corresponding senor operating temperature scope.The different condition of cure of epoxy glue coordinates different pretightning forces, can design
The different temperature range of sensor is selected for user.
Embodiment：
The present invention is realized according to procedure below：
Fiber grating 1 and the gluing fixation of enclosed chip 2；Protection sleeve pipe 3 and the gluing fixation of the enclosed chip 2.Optical fiber light
Grid 1 are Fiber Bragg Grating FBG, and the coat of optical fiber surface is polyimides.Enclosed chip 2 is stainless steel 301, protects sleeve pipe 3
It is resin material, external diameter is 0.9mm, the tail optical fiber for protecting fiber grating 1.
Fiber grating treats that the coat at viscose glue position is divested in advance and is easy to dispensing.Fiber grating 1 is passed through into enclosed chip 2,
Fixed with epoxy glue on all-wing aircraft 23, viscose glue point spacing LA.80 DEG C of epoxy glue solidification temperature, in second viscose glue point viscose glue of optical fiber
When on optical fiber apply pretightning force 2.5N, with ensure at low ambient temperatures optical fiber also keep straight configuration.Treat fiber grating viscose glue
After solidification is finished, the left and right sides is interted into fiber optic protection sleeve pipe 3, is cemented with epoxy glue.
The size of stainless steel enclosed chip 2 is as shown in Figure 4.The clamped thickness of point 22 is 1mm, case chip remainder thickness
It is 0.8mm.
Sensor of the invention is bonded at object under test surface, the tail optical fiber connection fiber grating demodulation of fiber grating
Instrument, another tail optical fiber can connect the fiber-optic grating sensor of different wave length.Wideband light source passes through tail from fiber Bragg grating (FBG) demodulator
Fibre enters sensor, and the light of arrowband is reflected back by fiber grating, is again introduced into (FBG) demodulator, can obtain the wavelength of back wave,
By detecting reflection wavelength, and known transducer sensitivity and zero point, it is possible to by being calculated answering for surface to be measured
Become.
Structure between the following clamped point 2 of desensitization mode is identical with surface strain to be measured, by being incited somebody to action after encapsulating structure desensitization
Strain transfer is on fiber grating.LAIt is the distance between optical fiber viscose glue point, is influenceed by viscose glue length, same enclosed chip
The sensor L of makingASize and inaccurate equal, LBIt is the length between clamped point, the L in the middle of this exampleA=29.5mm, LB
=6.3mm.The strain facies of strain and testee suffered by fiber grating itself is than desensitization εB/εA=LA/LB=4.68 times.
By demarcating, 6 samples that we make are as follows in the calibration result of metering institute：
No. 1 sample sensitivity 0.26pm/ μ ε linearity 0.9%
No. 2 sample sensitivity 0.26pm/ μ ε linearities 0.8%
No. 3 sample sensitivity 0.248pm/ μ ε linearities 0.9%
No. 4 sample sensitivity 0.239pm/ μ ε linearities 0.9%
No. 5 sample sensitivity 0.258pm/ μ ε linearities 0.9%
No. 6 sample sensitivity 0.250pm/ μ ε linearities 0.9%
As shown in figure 5, wherein transverse axis represents surface strain amount to be measured, maximum surpasses wherein No. 6 sensitivity relations of sample
16000 μ ε are crossed, the longitudinal axis represents the reflection wavelength (nm) of fiber grating, is the monitor value of fiber-optic grating sensor.It is anti-by calculating
The ejected wave response with surface strain amount to be measured long, can obtain the sensitivity of sensor.
From calibration result, sensor of the invention has preferable uniformity, and sensitivity is significantly reduced, and sensor can
To realize large range measuring, and data have the extraordinary linearity.
Unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.
Claims (6)
1. a kind of wide range fiber grating strain transducer, it is characterised in that including：Fiber grating (1), enclosed chip (2) and guarantor
Protecting pipe (3)；
Enclosed chip (2) is processed by whole piece rectangle stainless steel, is integrally formed, and enclosed chip (2) includes three parts,
Respectively：Clamped point (22), spring structure (21) and all-wing aircraft (23)；Two clamped points (22) are respectively positioned at spring structure (21)
Both sides, respectively the both sides with spring structure (21) be connected, two all-wing aircrafts (23) are located at two outsides of clamped point (22) respectively；Gu
, more than spring structure (21) and the thickness of all-wing aircraft (23), clamped point (22) is with respect to spring structure (21) and all-wing aircraft for fulcrum (22) thickness
(23) raised, the wide range fiber grating strain transducer is pasted onto installation surface by coating viscose glue on the bossing
On so that all-wing aircraft (23) has space and installation surface between；When installation surface is deformed upon, the bullet of the strain transducer
There is elastic deformation in spring structure (21), it is to avoid enclosed chip (2) occurs plastic deformation or breaks therewith；
Be provided with groove along long side direction on enclosed chip (2), fiber grating (1) pass through from the groove and fiber grating (1) with
The groove has two gluing fixing points, and part of the fiber grating (1) outside the enclosed chip (2) is cased with protecting sleeve pipe
(3) protected.
2. a kind of wide range fiber grating strain transducer according to claim 1, it is characterised in that：The fiber grating
(1) it is Fiber Bragg Grating FBG, the protection sleeve pipe (3) is resin material, and external diameter is 0.9mm.
3. a kind of wide range fiber grating strain transducer according to claim 1, it is characterised in that：Fiber grating (1)
With the distance between two gluing fixing points of groove LAThe distance between point (22) clamped with two LBBetween meet it is as follows
Relational expression：LA/LB≥εB/εA, εBIt is the range of the fiber Bragg grating strain sensor, εAIt is the fiber grating (1) tolerance
Maximum strain value.
4. a kind of wide range fiber grating strain transducer according to claim 1, it is characterised in that：The fiber grating
(1) epoxy glue is used with the groove bonding.
5. a kind of wide range fiber grating strain transducer according to claim 4, it is characterised in that：The fiber grating
(1) it is Nian Jie including hot setting and normal temperature cure two ways by epoxy glue with the groove, the hot setting refer to
Higher than being solidified under 80 DEG C of environment, normal temperature cure refers to be solidified in the range of room temperature.
6. a kind of wide range fiber grating strain transducer according to claim 5, it is characterised in that：Using hot setting
During mode, if the pretightning force between the fiber grating (1) and two gluing fixing points of the groove is 2N-2.5N,
The operating temperature range of the fiber Bragg grating strain sensor is -40 DEG C to 120 DEG C；If the fiber grating (1) with it is described
When pretightning force between two gluing fixing points of groove is 1.5N-2N, the operating temperature of the fiber Bragg grating strain sensor
Scope is 0 DEG C to 120 DEG C；
During using normal temperature cure mode, if pre- between the fiber grating (1) and two gluing fixing points of the groove
When clamp force is 1N-2N, the operating temperature range of the fiber Bragg grating strain sensor is -40 DEG C to 120 DEG C；If the optical fiber
When pretightning force between grating (1) and two gluing fixing points of the groove is 0.5N-1N, the fiber grating strain sensor
The operating temperature range of device is 0 DEG C to 120 DEG C.
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| CN201410505524.6A CN104279973B (en) | 2014-09-26 | 2014-09-26 | A kind of wide range fiber grating strain transducer |
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| CN201410505524.6A CN104279973B (en) | 2014-09-26 | 2014-09-26 | A kind of wide range fiber grating strain transducer |
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| CN104279973B true CN104279973B (en) | 2017-06-06 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106767690B (en) * | 2017-03-06 | 2023-03-24 | 沈阳建筑大学 | Spring type fiber grating dislocation meter |
| CN107990837A (en) * | 2017-12-14 | 2018-05-04 | 北京遥测技术研究所 | A kind of fiber Bragg grating strain sensor |
| CN107907241B (en) * | 2017-12-27 | 2020-11-20 | 北京信息科技大学 | Substrate type FBG temperature sensitization sensor and performance testing method |
| CN107907069A (en) * | 2017-12-27 | 2018-04-13 | 北京信息科技大学 | A kind of substrate formula temperature strain measurement FBG sensor and performance test methods |
| CN108759681B (en) * | 2018-04-28 | 2020-10-20 | 中国神华能源股份有限公司 | Optical fiber grating sensor |
| CN110057309B (en) * | 2019-05-21 | 2024-02-09 | 衢州学院 | Method for installing and detaching fiber bragg grating strain sensor applicable to various working conditions |
| 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 |
| CN115046489B (en) * | 2022-03-25 | 2023-04-18 | 武汉理工大学 | Device and method for controlling pre-tightening amount of optical fiber high-temperature strain sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003222507A (en) * | 2002-01-31 | 2003-08-08 | Hitachi Cable Ltd | Optical fiber sensor and strain monitoring system using sensor |
| CN2550719Y (en) * | 2002-05-30 | 2003-05-14 | 欧进萍 | Optical fiber and grating sheet type package strainometer |
| US7068869B1 (en) * | 2005-01-10 | 2006-06-27 | Francisco Manuel Moita Araujo | Passive athermal fiber bragg grating strain gage |
| CN100533056C (en) * | 2007-10-19 | 2009-08-26 | 大连理工大学 | Encapsulation method for optical fibre grating add-and-subtract quick strain sensor |
| CN101571380B (en) * | 2009-06-09 | 2011-04-06 | 中国人民解放军海军工程大学 | Wide range fiber grating strain transducer |
| CN102865827A (en) * | 2012-06-29 | 2013-01-09 | 杭州珏光物联网科技有限公司 | Fiber Bragg grating strain sensor |
| CN104019759B (en) * | 2014-06-17 | 2016-09-14 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of super large strain transducer based on fiber grating |
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