CN106441140A - Fiber grating strain sensibilization sensor - Google Patents
Fiber grating strain sensibilization sensor Download PDFInfo
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- CN106441140A CN106441140A CN201610937292.0A CN201610937292A CN106441140A CN 106441140 A CN106441140 A CN 106441140A CN 201610937292 A CN201610937292 A CN 201610937292A CN 106441140 A CN106441140 A CN 106441140A
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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 discloses a fiber grating strain sensibilization sensor, which comprises a fiber grating and an elastic sensitization substrate. The fiber grating is fixedly arranged on the elastic sensitization substrate; and the fiber tails at the two ends of the fiber grating are respectively sleeved by a fiber protection sleeve. The elastic sensitization substrate comprises a fiber grating fixation mechanism and a lever sensibilization mechanism, which are in an integrated structure. The fiber grating fixation mechanism is provided with two sections of semicircular fine grooves. The two sections of semicircular fine grooves are used for fixing the fiber grating and the fiber protection sleeves, and under the condition that the fiber grating is suspended between the two sections of semicircular fine grooves, fixation is realized by applying a pretightening force and through a fiber fixation coating layer; and by changing the structure size of the lever sensibilization mechanism, adjustment of the sensibilization effect is realized. The fiber grating strain sensibilization sensor has higher strain sensibilization coefficient, and the strain sensitivity thereof is 5-6 times higher than that of a bare fiber grating; and meanwhile, the fiber grating strain sensibilization sensor is simple in structure and convenient to install, has higher consistency and reliability and can be used repeatedly.
Description
Technical field
The present invention relates to technical field of optical fiber sensing, more particularly to a kind of fiber grating strain sensitizing sensor.
Background technology
In space flight and aviation, engineering machinery, in the industry such as building structure, the mechanical analyses of structure cannot be all left, and is answered
Become in engineering mechanics a vital physical quantity usually by as to the health monitoring of structure, non-destructive tests with
Key parameter in new material performance test is detected.Existing strain detecting method mainly has resistance strain plate, piezoelectricity
Formula foil gauge, although foil gauge main body mounting means is simple, but the wiring of foil gauge is complicated, and during multimetering, wiring quantity is huge
Greatly, electromagnetic interference is easily received.
Fiber grating is had a wide range of applications in sensory field of optic fibre as a kind of new sensing components, it
With electromagnetism interference, the feature of multiple spot measuring multiple parameters；Fiber grating is very suitable for being applied to structural strain field measurement, especially
Be for heavy duty crane, the online monitoring structural health conditions of the large scale structure such as large-size numerical control machine.
Little yet with these large scale structure deflections, therefore produced should diminish, and fiber grating is passed through organic gel
The strain detecting method strain sensitivity that water is directly fixed on matrix surface to be measured is not high, former according to fiber grating strain transmission
Reason, the strain measurement sensitivity that can obtain naked grating is 1.2 μ ε/pm, it is impossible to measure the microstrain change in monitoring structural health conditions.Existing
Some fiber Bragg grating strain sensors predominantly carry out base chip package to fiber grating, and it can effectively improve fiber grating
Stability, while simplifying sensor installation steps, but its strain sensitivity is not equally high；The existing fiber grating of MOI company
Maximum strain sensitivity in strain sensing product is only 1.4 μ ε/pm.In one kind that patent No. CN201210278682.3 is proposed
Sensor measurement range is increased by improving to the structure of substrate in fiber Bragg grating strain sensor design, while to light
Fine grating has carried out good protection, but its strain sensitivity is only 1.1 μ ε/pm.The spirit of fiber Bragg grating strain sensor
Sensitivity is low, application of the fiber Bragg grating strain sensor in monitoring structural health conditions of certainty of measurement lower limit.
Content of the invention
The technical problem to be solved in the present invention be for fiber Bragg grating strain sensor sensitivity in prior art low, survey
The low defect of accuracy of measurement, is provided a kind of certainty of measurement that effectively can improve and is sensed with the fiber grating strain enhanced sensitivity of sensitivity
Device.
The technical solution adopted for the present invention to solve the technical problems is：
The present invention provides a kind of fiber grating strain sensitizing sensor, including fiber grating and elastic enhanced sensitivity substrate, optical fiber
Grating is fixedly mounted on elastic enhanced sensitivity substrate, and the optical fiber afterbody at the two ends of fiber grating is set with shield fiber coating pipe；Wherein：
Elastic enhanced sensitivity substrate includes the fiber grating fixed mechanism of integral structure and lever enhanced sensitivity mechanism；Fiber grating is solid
Determine to be horizontally disposed with mechanism and have two sections of semicircle strias, two sections of semicircle strias are used for fixing the shield fiber coating pipe at fiber grating two ends；?
Fiber grating vacantly between two sections of semicircle strias in the case of apply prestressing force and by optical fiber fixation coat be fixed；
The regulation to effect of enhanced sensitivity is realized by the physical dimension for changing lever enhanced sensitivity mechanism.
Further, the fiber grating fixed mechanism on the elastic enhanced sensitivity substrate of the present invention also includes that left installation is fixing flat
Plate, lever region of elongation and right installation fixed flat planar；Lever enhanced sensitivity mechanism includes support arm, lever arm and regulating arm；Wherein：
With left, support arm one end installs that fixed flat planar is vertical is connected, the other end is vertical with lever arm to be connected；Lever arm extends
Area is located at the top of lever arm；Regulating arm one end is vertical with lever arm to be connected, with right, the other end installs that fixed flat planar is vertical is connected；
Two sections of semicircle strias are separately positioned on left installation fixed flat planar and lever arm extension area；During measurement by left installation fixed flat planar and
Right installation fixed flat planar is fixed on matrix to be measured.
Further, the elastic enhanced sensitivity substrate of the present invention is that axisymmetric structure, fiber grating fixed mechanism also includes a left side
Fixed flat planar, two lever regions of elongation and right installation fixed flat planar are installed；Lever enhanced sensitivity mechanism includes support arm, two lever arms
With two regulating arms；Wherein：
Support arm and two lever arms constitute U-shape structure, one end of two regulating arms phase vertical with two lever arms respectively
Hand over, the other end of two regulating arms is intersected vertically with left installation fixed flat planar and right installation fixed flat planar respectively；Two levers prolong
The top that area is separately positioned on two lever arms is stretched, two sections of semicircle strias are separately positioned on two lever extension areas；During measurement
Left installation fixed flat planar and right installation fixed flat planar are fixed on matrix to be measured.
Further, the elastic enhanced sensitivity substrate of the present invention is that axisymmetric structure, fiber grating fixed mechanism also includes a left side
Fixed flat planar, two lever regions of elongation and right installation fixed flat planar are installed；Lever enhanced sensitivity mechanism includes two lever arms and two
Regulating arm；Wherein：
Two lever arms constitute V-structure, and one end of two regulating arms is intersected with two lever arms respectively, two regulating arms
The other end respectively with left installation fixed flat planar and right installation fixed flat planar intersect vertically；Two lever extension areas are separately positioned on
The top of two lever arms, two sections of semicircle strias are separately positioned on two lever extension areas；By left, fixing putting down is installed during measurement
Plate and right installation fixed flat planar are fixed on matrix to be measured.
Further, the fiber grating of the present invention is fixed coat by optical fiber and is fixed in semicircle stria, and optical fiber is fixed
Coat includes glass solder coat and organic glue coat；After the completion of coat fixation fixed by optical fiber, in fiber grating
The afterbody suit shield fiber coating pipe at two ends, and be fixed on fiber coating pipe is protected in semicircle stria by organic glue.
Further, the regulating arm of the present invention is used for will be passed to the distortional stress of lever arm being amplified, and passes to
Fiber grating.
Further, the present invention before fiber grating to be fixed to semicircle stria, to fiber grating apply prestressing force,
When ensureing that elastic enhanced sensitivity substrate produces transverse compression deformation, fiber grating does not bend.
Further, during the measurement of the present invention, left installation fixed flat planar and right installation fixed flat planar are fixed on matrix to be measured
On mode include：
By being pasted onto on matrix to be measured in left installation fixed flat planar and the organic glue of right installation fixed flat planar backside coating；
By way of using electric current welding, left installation fixed flat planar and right installation fixed flat planar are welded on matrix to be measured；On a left side
Install on fixed flat planar and right installation fixed flat planar and screw is set, be fixed on matrix to be measured by bolt.
Further, it is provided with each corner location of the elastic enhanced sensitivity substrate of the present invention for avoiding stress concentration existing
The fillet of elephant.
Further, the present invention changes effect of enhanced sensitivity by the physical dimension of regulation support arm, lever arm and regulating arm；
Further, the formula of the calculating strain sensitization multiple of the elastic enhanced sensitivity substrate of the present invention is：
If the left gauge length that installs between fixed flat planar and right installation fixed flat planar is l, between two fixing point of fiber grating
Length is lg, wherein, left installation fixed flat planar and the right installation fixed flat planar amount of deforming are Δ l, to generate power on regulating arm,
And result in lever arm and deform, the deformation is acted on by lever amplification and fiber grating, and fiber grating is produced put
Large deformation Δ lg.
The beneficial effect comprise that：The fiber grating strain sensitizing sensor of the present invention, by arranging encapsulation base
Piece is elastic enhanced sensitivity substrate, and the elastic enhanced sensitivity substrate greatly improves lifting fiber grating substrate formula by simple lever construction should
Become the sensitivity of sensor, exceed existing fiber Bragg grating strain sensor；Elastic enhanced sensitivity substrate can be added by wire cutting
Work is integrally formed, process is simple, and cost is relatively low；By adjusting the physical dimension of lever enhanced sensitivity mechanism, can realize to the optical fiber
The sensitivity of grating strain sensitizing sensor and the regulation of enhanced sensitivity multiple, realize higher certainty of measurement；There is higher strain
Enhanced sensitivity coefficient, its strain sensitivity is 5～6 times of bare optical fibers and bare optical gratings, while simple structure, easy for installation, with higher one
Cause property and reliability, and it is easy to use repeatly.
Description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the positive structure schematic of the embodiment of the present invention；
Fig. 2 is the structural representation of the elastic enhanced sensitivity substrate of the embodiment of the present invention；
Fig. 3 is elastic enhanced sensitivity substrate simplified model figure in the embodiment of the present invention 1；
Fig. 4 is elastic enhanced sensitivity substrate structure dimensional drawing in the embodiment of the present invention 1；
Fig. 5 is elastic enhanced sensitivity substrate axonometric chart in the embodiment of the present invention 1；
Fig. 6 is elastic enhanced sensitivity substrate and the actual measurement figure of naked grating strain in the embodiment of the present invention 1；
Fig. 7 is the elastic enhanced sensitivity substrate modified structure schematic diagram of the embodiment of the present invention；
Fig. 8 is elastic enhanced sensitivity substrate two structural representations of remodeling of the embodiment of the present invention；
In figure, 1- ferrule, the organic glue of 2-, 3- optical fiber fixes coat, 4- fiber grating, 5- elasticity enhanced sensitivity base
Piece, 5-1- semicircle stria, the left installation fixed flat planar of 5-2-, 5-3- support arm, 5-4- lever arm, 5-5- lever arm extension area, 5-
6- regulating arm, the right installation fixed flat planar of 5-7-.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, not
For limiting the present invention.
As shown in figure 1, the fiber grating strain sensitizing sensor of the embodiment of the present invention, it is characterised in that including optical fiber light
Grid 4 and elastic enhanced sensitivity substrate 5, fiber grating 4 is fixedly mounted on elastic enhanced sensitivity substrate 5, the optical fiber tail at the two ends of fiber grating 4
Portion is set with shield fiber coating pipe 1；Wherein：
Elastic enhanced sensitivity substrate 5 includes the fiber grating fixed mechanism of integral structure and lever enhanced sensitivity mechanism；Fiber grating
Being horizontally disposed with fixed mechanism has two sections of semicircle stria 5-1, and two sections of semicircle stria 5-1 are used for fixing the shield at 4 two ends of fiber grating
Fiber coating pipe 1, is applied prestressing force in the case that fiber grating 4 is hanging between two sections of semicircle stria 5-1 and is fixed by grating
Coat is fixed；The regulation to effect of enhanced sensitivity is realized by the physical dimension for changing lever enhanced sensitivity mechanism.
As shown in Fig. 2 fiber grating strain sensitizing sensor is carved with 4, elasticity of fiber grating optical fiber comprising one increasing
Quick substrate 5 and two shield fiber coating pipes 1, wherein：
Elastic enhanced sensitivity substrate has enhanced sensitivity lever construction, including left installation fixed flat planar 5-2, support arm 5-3, lever arm 5-4,
For placing the half of fiber grating on lever arm extension area 5-5, regulating arm 5-6, left installation fixed flat planar and lever arm extension area
Circle stria 5-1, right installation fixed flat planar 5-7；Support arm 5-3 is connected and vertical with left installation fixed flat planar 5-2, lever arm 5-4
Vertical with support arm 5-3 be connected, lever arm extension area 5-5 is located at lever arm 5-4 one end as fiber grating paste position, adjusts
Arm 5-6 perpendicular to lever arm 5-4 and is located on lever arm 5-4, while with right, regulating arm 5-6 installs that fixed flat planar 5-7 is vertical connects
Connect, left installation fixed flat planar 5-2 and lever arm extension area 5-5 is used for installing fixing light with semicircle stria 5-1 in relative position
Fine grating 4；Fiber grating 4 is positioned over the semicircle stria 5-1 on left installation fixed flat planar 5-2 and lever arm extension area 5-5,
Ensure that fiber grating 4 applies prestressing force in the case of being suspended between left installation fixed flat planar 5-2 and lever arm extension area 5-5,
Fiber grating grid region two ends are fixed on by left installation fixed flat planar 5-2 by the method for glass solder or organic glue coating 3
On the 5-5 of lever arm extension area, cooling to be welded or after glue is fully cured, two shield fiber coating pipes 1 are inserted in optical fiber light respectively
Grid or so tail optical fiber, and left installation fixed flat planar 5-2 and lever arm extension area 5-5 is pasted on by fiber coating pipe 1 is protected by organic glue 2
On to protect optical fiber pigtail not rupture；During use, fixed flat planar is installed in left and right to be fixed on matrix to be measured.
Elastic enhanced sensitivity substrate 5 includes left installation fixed flat planar 5-2, support arm 5-3, lever arm 5-4, lever arm extension area 5-
5th, for the semicircle stria 5-1 for placing fiber grating, right peace on regulating arm 5-6, left installation fixed flat planar and lever arm extension area
Dress fixed flat planar 5-7.
Support arm 5-3 is connected and vertical with left installation fixed flat planar 5-2, and lever arm 5-4 is vertical with support arm 5-3 to be connected,
Lever arm extension area 5-5 is located at lever arm 5-4 one end, and regulating arm 5-6 perpendicular to lever arm 5-4 and is located on lever arm 5-4, with
When regulating arm 5-6 install that fixed flat planar 5-7 is vertical to be connected with right, left installation fixed flat planar 5-2 and lever arm extension area 5-5 is in phase
Position is used for installing fixing fiber grating 4 with semicircle stria 5-1.
Fiber grating 4 is positioned in the semicircle stria 5-1 on left installation fixed flat planar 5-2 and lever arm extension area 5-5,
Apply in the case that guarantee fiber grating 4 is suspended between left installation fixed flat planar 5-2 and lever arm extension area 5-5 larger
Prestressing force ensures that fiber grating 4 is tightened, when ensure that after fiber grating 4 is fixed substrate measurement compression strain is, optical fiber light
Grid 4 do not bend；And fiber grating grid region two ends are fixed on by left installation by the method for glass solder or organic glue coating 3
On fixed flat planar 5-2 and lever arm extension area 5-5, cooling to be welded or after glue is fully cured, ferrule 1 is inserted in optical fiber
Grating or so tail optical fiber, and ferrule 1 is pasted on by left installation fixed flat planar 5-2 and lever arm extension area by organic glue 2
5-5 is upper to protect optical fiber pigtail not rupture.
The fiber grating strain sensitizing sensor of the embodiment of the present invention has three kinds of mounting means, and first method is：
Organic glue of fixed flat planar backside coating high intensity is installed in left and right, by its bonding and matrix to be measured, is waited
Organic glue can achieve the installation of fiber grating strain sensitizing sensor of the present invention after fastening completely.
Second method is：
By way of electric current is welded, fixed flat planar is installed in left and right to be welded with matrix to be measured, its implementation condition is for treating
Surveying matrix material and the material for being easy to weld is with elastic enhanced sensitivity substrate material, will ensure elastic enhanced sensitivity substrate in welding process
Pre-tensioned state is kept, to offset after welding cooling, the shrinkage of elastic enhanced sensitivity substrate.
The third method is：
In left and right, symmetrical machining installation bolt hole on fixed flat planar, and same location processing screw thread on matrix to be measured are installed
Hole, is bolted and is attached fiber grating strain sensitizing sensor of the present invention and matrix to be measured.
As shown in figure 3, internal for elastic enhanced sensitivity substrate each structure is reduced to bar connection, and each bar center is taken for each bar
Simplify initial point, it is fixed edge to take left and right and install fixed flat planar, therefore the specific works of the fiber grating strain sensitizing sensor
Principle is as follows：
Assume that the deformation that object under test is produced between two fixed plates of fiber grating strain sensitizing sensor of the present invention is
Δ l, i.e. E point and A point, from mechanics of materials ultimate principle：It is section l that elastic enhanced sensitivity substrate removes total deformation outside mounting portion1
With section l2Stretcher strain Δ l1With Δ l2, and section l5Deflection deformation w1, therefore can obtain：
Δ l=Δ l1+Δl2+w1
If the now total deformation of the generation at fiber grating is Δ lg, now on regulating arm, power F being generated, the power is in section
l5Generate amount of deflection w1With rotational angle thetaB, the deformation Δ l in point C can be obtained by simple geometrical calculationgFor：
Δlg=Δ l2+w1+l4·sinθB
According to mechanics of materials flexural deformation and stretcher strain correlation theory：
Due to θBLess, therefore can be by sin θBIt is approximately θB, can obtain：
IfSize in Fig. 4 size is substituted into and be can be calculated：
Δ l=10a+4.5a+21.4375a=35.9375a
Δlg=4.5a+21.4375a+5 × 9.1875a=71.875a
Then strain sensitization multiple is：
The effect of enhanced sensitivity experiment of flexible substrates is measured as the 5.3 of the direct sticking effect of common bare optical fibers and bare optical gratings as shown in Figure 5
Times or so.
As shown in fig. 6, in embodiments of the invention 1：Fiber grating fixed mechanism on elastic enhanced sensitivity substrate 5 also includes
Left installation fixed flat planar 5-2, lever region of elongation 5-5 and right installation fixed flat planar 5-7；Lever enhanced sensitivity mechanism include support arm 5-3,
Lever arm 5-4 and regulating arm 5-6；Wherein：
With left, support arm 5-3 one end installs that fixed flat planar 5-2 is vertical is connected, the other end is vertical with lever arm 5-4 to be connected；Thick stick
Lever arm extension area 5-5 is located at the top of lever arm 5-4；Regulating arm 5-6 one end is vertical with lever arm 5-4 to be connected, the other end and the right side
Fixed flat planar 5-7 is installed vertically connect；Two sections of semicircle stria 5-1 are separately positioned on left installation fixed flat planar 5-2 and lever arm prolongs
Stretch on area 5-5；During measurement, left installation fixed flat planar 5-2 and right installation fixed flat planar 5-7 is fixed on matrix to be measured.
As shown in fig. 7, in embodiments of the invention 2：Elastic enhanced sensitivity substrate 5 is axisymmetric structure, and fiber grating is solid
Determining mechanism also includes left installation fixed flat planar 5-2, two lever region of elongation 5-5 and right installation fixed flat planar 5-7；Lever enhanced sensitivity machine
Structure includes support arm 5-3, two lever arm 5-4 and two regulating arm 5-6；Wherein：
Support arm 5-3 and two lever arm 5-4 constitutes U-shape structure, one end of two regulating arm 5-6 respectively with two levers
Arm 5-4 intersects vertically, the other end of two regulating arm 5-6 respectively with left installation fixed flat planar 5-2 and right installation fixed flat planar 5-7
Intersect vertically；Two lever extension area 5-5 are separately positioned on the top of two lever arm 5-4, and two sections of semicircle stria 5-1 are set respectively
Put on two lever extension area 5-5；During measurement, left installation fixed flat planar 5-2 and right installation fixed flat planar 5-7 is fixed on and treats
Survey on matrix.
As shown in figure 8, in embodiments of the invention 3：Elastic enhanced sensitivity substrate 5 is axisymmetric structure, and fiber grating is solid
Determining mechanism also includes left installation fixed flat planar 5-2, two lever region of elongation 5-5 and right installation fixed flat planar 5-7；Lever enhanced sensitivity machine
Structure includes two lever arm 5-4 and two regulating arm 5-6；Wherein：
Two lever arm 5-4 constitute V-structure, and one end of two regulating arm 5-6 is intersected with two lever arm 5-4 respectively,
The other end of two regulating arm 5-6 is intersected vertically with left installation fixed flat planar 5-2 and right installation fixed flat planar 5-7 respectively；Two
Lever extension area 5-5 is separately positioned on the top of two lever arm 5-4, and two sections of semicircle stria 5-1 are separately positioned on two levers
On the 5-5 of extension area；During measurement, left installation fixed flat planar 5-2 and right installation fixed flat planar 5-7 is fixed on matrix to be measured.
Fiber grating 4 is fixed coat 3 by optical fiber and is fixed in semicircle stria 5-1, and coat 3 fixed by optical fiber includes glass
Glass welding coat and organic glue coat；After the completion of the fixation of coat 3 fixed by optical fiber, in the afterbody at 4 two ends of fiber grating
Suit shield fiber coating pipe 1, and be fixed on fiber coating pipe 1 is protected in semicircle stria 5-1 by organic glue.
Regulating arm 5-6 is used for will be passed to the distortional stress of lever arm 5-4 and is amplified, and passes to fiber grating.
Before fiber grating 4 to be fixed to semicircle stria 5-1, prestressing force is applied to fiber grating 4, it is ensured that elastic enhanced sensitivity
When substrate 5 produces transverse compression, fiber grating 4 does not bend.
During measurement, left installation fixed flat planar 5-2 and right installation fixed flat planar 5-7 is fixed on the mode bag on matrix to be measured
Include：
To be measured by being pasted onto in left installation fixed flat planar 5-2 and the organic glue of right installation fixed flat planar 5-7 backside coating
On matrix；By way of using electric current welding, left installation fixed flat planar 5-2 and right installation fixed flat planar 5-7 is welded on and treats
Survey on matrix；Screw is set on left installation fixed flat planar 5-2 and right installation fixed flat planar 5-7, is fixed to by bolt
On matrix to be measured.
The fillet being provided with each corner location of elastic enhanced sensitivity substrate 5 for avoiding stress concentration phenomenon.
By the physical dimension of support arm 5-3, lever arm 5-4 and regulating arm 5-6 is adjusted, change effect of enhanced sensitivity；Calculating should
Become enhanced sensitivity multiple formula into：
Wherein, left installation fixed flat planar 5-2 and the right installation fixed flat planar 5-7 amount of deforming are Δ l, on regulating arm 5-6
Power is generated, the power result in lever arm 5-4 and deform, the deformation acts on 4 bearing of fiber grating by lever amplification
Deformation Δ l is amplified in generationg, it is assumed that gauge length of the left installation between fixed flat planar 5-2 and right installation fixed flat planar 5-7 is l, optical fiber light
Length between 4 liang of fixing points of grid is lg.
Beneficial effects of the present invention are：
1. the enclosed chip of the fiber grating strain sensitizing sensor of the present invention is elastic enhanced sensitivity substrate, the elastic enhanced sensitivity base
Piece greatly improves the sensitivity of lifting fiber grating substrate formula strain transducer by simple lever construction, has exceeded existing
Fiber Bragg grating strain sensor.Elastic enhanced sensitivity substrate can be integrally formed by linear cutter, process is simple, and cost is relatively low.
2. the elastic enhanced sensitivity substrate described in by adjust lever arm, regulating arm, the size of support arm and mutually it
Between distance, can simply adjust the sensitivity enhanced sensitivity multiple of the fiber grating strain sensitizing sensor.
3. the fixed form between fiber grating and described half slot can select glass solder bonding with organic glue,
Adapt to different process conditions, while big pretightning force when fixing can ensure that substrate fiber grating energy when compression is subject to
Strain is enough perceived, it is ensured that the normal work under differently strained monitoring situation.
4. metal substrate is stable and reliable for performance, by selecting different fiber grating strain sensitizing sensors and matrix to be measured
Fixed form：Bolt connection, organic glue bonding, electric current is welded, and fiber grating strain sensitizing sensor can be made to obtain weight
New utilization, improves fiber Bragg grating strain sensor and is only capable of expendable defect.
It should be appreciated that for those of ordinary skills, can be improved according to the above description or be converted,
And all these modifications and variations should all belong to the protection domain of claims of the present invention.
Claims (10)
1. a kind of fiber grating strain sensitizing sensor, it is characterised in that including fiber grating (4) and elastic enhanced sensitivity substrate (5),
Fiber grating (4) is fixedly mounted on elastic enhanced sensitivity substrate (5), and the optical fiber afterbody at fiber grating (4) two ends is set with the fine set of shield
Pipe (1)；Wherein：
Elastic enhanced sensitivity substrate (5) include the fiber grating fixed mechanism of integral structure and lever enhanced sensitivity mechanism；Fiber grating is solid
Determine level in mechanism and be machined with two sections of semicircle strias (5-1), two sections of semicircle strias (5-1) be used for fixing fiber grating (4) and
The shield fiber coating pipe (1) at two ends；Apply prestressing force in the case that fiber grating (4) is hanging between two sections of semicircle strias (5-1)
And be fixed by optical fiber fixation coat；The tune to effect of enhanced sensitivity is realized by the physical dimension for changing lever enhanced sensitivity mechanism
Section.
2. fiber grating strain sensitizing sensor according to claim 1, it is characterised in that on elastic enhanced sensitivity substrate (5)
Fiber grating fixed mechanism also include left installation fixed flat planar (5-2), lever region of elongation (5-5) and right installation fixed flat planar
(5-7)；Lever enhanced sensitivity mechanism includes support arm (5-3), lever arm (5-4) and regulating arm (5-6)；Wherein：
Support arm (5-3) one end is vertical with left installation fixed flat planar (5-2) to be connected, and the other end is vertical with lever arm (5-4) to be connected；
Lever arm extension area (5-5) is located at the top of lever arm (5-4)；Regulating arm (5-6) one end is vertical with lever arm (5-4) to be connected,
The other end is vertical with right installation fixed flat planar (5-7) to be connected；Two sections of semicircle strias (5-1) are separately positioned on left installation fixed flat planar
(5-2) and on lever arm extension area (5-5)；Will be solid to left installation fixed flat planar (5-2) and right installation fixed flat planar (5-7) during measurement
It is scheduled on matrix to be measured.
3. fiber grating strain sensitizing sensor according to claim 1, it is characterised in that elastic enhanced sensitivity substrate (5) are
Axisymmetric structure, fiber grating fixed mechanism also include left installation fixed flat planar (5-2), two lever regions of elongation (5-5) and
Right installation fixed flat planar (5-7)；Lever enhanced sensitivity mechanism includes support arm (5-3), two lever arms (5-4) and two regulating arms
(5-6)；Wherein：
Support arm (5-3) and two lever arms (5-4) constitute U-shape structure, one end of two regulating arms (5-6) respectively with two thick sticks
Lever arm (5-4) intersects vertically, and the other end of two regulating arms (5-6) is solid with left installation fixed flat planar (5-2) and right installation respectively
Allocate plate (5-7) to intersect vertically；Two lever extension areas (5-5) are separately positioned on the top of two lever arms (5-4), and two and half
Circle stria (5-1) is separately positioned on two lever extension areas (5-5)；By left installation fixed flat planar (5-2) and right peace during measurement
Dress fixed flat planar (5-7) is fixed on matrix to be measured.
4. fiber grating strain sensitizing sensor according to claim 1, it is characterised in that elastic enhanced sensitivity substrate (5) are
Axisymmetric structure, fiber grating fixed mechanism also include left installation fixed flat planar (5-2), two lever regions of elongation (5-5) and
Right installation fixed flat planar (5-7)；Lever enhanced sensitivity mechanism includes two lever arms (5-4) and two regulating arms (5-6)；Wherein：
Two lever arms (5-4) constitute V-structures, one end of two regulating arms (5-6) respectively with two lever arm (5-4) phases
Hand over, the other end of two regulating arms (5-6) is vertical with left installation fixed flat planar (5-2) and right installation fixed flat planar (5-7) respectively
Intersecting；Two lever extension areas (5-5) are separately positioned on the top of two lever arms (5-4), and two sections of semicircle strias (5-1) are respectively
It is arranged on two lever extension areas (5-5)；By left installation fixed flat planar (5-2) and right installation fixed flat planar (5-7) during measurement
It is fixed on matrix to be measured.
5. fiber grating strain sensitizing sensor according to claim 1, it is characterised in that fiber grating (4) passes through light
Fine fixing coat (3) is fixed in semicircle stria (5-1), and coat (3) fixed by optical fiber includes glass solder coat and have
Machine glue coat；After the completion of optical fiber fixation coat (3) is fixing, in the afterbody suit shield fiber coating pipe at fiber grating (4) two ends
(1), and fiber coating pipe (1) will be protected by organic glue to be fixed in semicircle stria (5-1).
6. the fiber grating strain sensitizing sensor according to claim 2-4, it is characterised in that regulating arm (5-6) is used for
The deformation that will be passed to lever arm (5-4) is amplified, and passes to fiber grating.
7. fiber grating strain sensitizing sensor according to claim 1, it is characterised in that fiber grating (4) is solid
Surely before arriving semicircle stria (5-1), prestressing force is applied to fiber grating (4), it is ensured that elastic enhanced sensitivity substrate (5) produce transverse compression
During deformation, fiber grating (4) does not bend.
8. the fiber grating strain sensitizing sensor according to claim 2-4, it is characterised in that during measurement by left install solid
Allocating plate (5-2) and right fixed flat planar (5-7) mode that is fixed on matrix to be measured of installing includes：
To be measured by being pasted onto in left installation fixed flat planar (5-2) and the organic glue of right installation fixed flat planar (5-7) backside coating
On matrix；By way of using electric current welding, by left installation fixed flat planar (5-2) and right installation fixed flat planar (5-7) welding
On matrix to be measured；In left installation fixed flat planar (5-2) and the upper setting screw of right installation fixed flat planar (5-7), will by bolt
Which is fixed on matrix to be measured.
9. fiber grating strain sensitizing sensor according to claim 1, it is characterised in that elastic enhanced sensitivity substrate (5)
The fillet being provided with each corner location for avoiding stress concentration phenomenon.
10. the fiber grating strain sensitizing sensor according to claim 2-3, it is characterised in that by adjusting support arm
(5-3), the physical dimension of lever arm (5-4) and regulating arm (5-6), changes effect of enhanced sensitivity；Its strain sensitization multiple computing formula
For：
If the left fixed flat planar (5-2) and the right gauge length that installs between fixed flat planar (5-7) installed is l, fiber grating (4) two is fixed
Length between point is lg, wherein, the amount of deforming between left installation fixed flat planar (5-2) and right installation fixed flat planar (5-7)
For Δ l, on regulating arm (5-6), power is generated, the power result in lever arm (5-4) and deform, and act on by lever amplification
In fiber grating (4), cause fiber grating to produce and amplify deformation Δ lg.
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| CN108692669B (en) * | 2018-03-26 | 2024-03-26 | 林和光 | Fiber bragg grating sensor for railway track axle |
| CN110823122A (en) * | 2018-08-08 | 2020-02-21 | 武汉理工大学 | Bending curvature measuring device and method based on fiber bragg grating and elastic body |
| CN109374067A (en) * | 2018-12-11 | 2019-02-22 | 武汉理工大学 | Many reference amounts Fibre Optical Sensor highway plate-girder real-time monitoring system and monitoring method |
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| WO2021098879A1 (en) * | 2019-11-22 | 2021-05-27 | 奥动新能源汽车科技有限公司 | Looseness monitoring device and system of bolt or nut |
| CN112097884A (en) * | 2020-06-09 | 2020-12-18 | 承德石油高等专科学校 | Dynamic rail weighing fiber grating pressure sensor with flexible amplifying structure |
| CN111998989A (en) * | 2020-07-28 | 2020-11-27 | 西北大学 | Diaphragm type fiber grating pressure sensor based on lateral load sensitization |
| CN111998989B (en) * | 2020-07-28 | 2021-09-14 | 西北大学 | Diaphragm type fiber grating pressure sensor based on lateral load sensitization |
| KR102297331B1 (en) * | 2020-10-16 | 2021-09-03 | 한국건설기술연구원 | Apparatus for Measuring Strain of Pipe, and Method for Monitoring Leakage of Pipe Connection |
| CN113218319A (en) * | 2021-05-06 | 2021-08-06 | 桂林理工大学 | Fiber bragg grating strain sensor compression-tension conversion and sensitivity enhancement device and using method thereof |
| CN113218319B (en) * | 2021-05-06 | 2023-06-23 | 桂林理工大学 | Fiber bragg grating strain sensor compression-tension conversion and sensitivity enhancement device and application method thereof |
| CN114985228A (en) * | 2022-05-10 | 2022-09-02 | 武汉理工大学 | Gluing process for improving high-temperature resistance of sensor |
| CN116007804B (en) * | 2023-01-02 | 2023-12-15 | 水利部交通运输部国家能源局南京水利科学研究院 | Water engineering concealed limited area polarization maintaining fiber multi-purpose intelligent sensing system and method |
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Application publication date: 20170222 |