CN109211302A - Calibration device, calibration system and the scaling method of naked FBG strain transducer - Google Patents
Calibration device, calibration system and the scaling method of naked FBG strain transducer Download PDFInfo
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- CN109211302A CN109211302A CN201811149267.1A CN201811149267A CN109211302A CN 109211302 A CN109211302 A CN 109211302A CN 201811149267 A CN201811149267 A CN 201811149267A CN 109211302 A CN109211302 A CN 109211302A
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
-
- 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
- G01B11/161—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by interferometric means
-
- 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
- G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/04—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness by measuring coordinates of points
- G01B21/042—Calibration or calibration artifacts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement
- G01D5/35309—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer
- G01D5/35316—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer using a Bragg gratings
Abstract
The invention belongs to sensory field of optic fibre, disclose calibration device, calibration system and the scaling method of a kind of naked FBG strain transducer.The calibration device includes the calibration pedestal and micro-displacement generation device demarcating bottom plate and being separately positioned at the top of the calibration bottom plate；The calibration pedestal and micro-displacement generation device are respectively equipped with locating slot and match the elastic cushion of setting with locating slot, and the naked FBG strain transducer is fixed between calibration pedestal and micro-displacement generation device by locating slot and elastic cushion；The calibration pedestal is fixedly connected with calibration bottom plate, and the micro-displacement generation device can be relative to calibration bottom plate movement；Done relative motion on calibration bottom plate by micro-displacement generation device, change micro-displacement generation device between calibration pedestal at a distance from, and then change the wavelength of naked FBG strain transducer to be measured.The present invention can obtain the good linearity and uncertainty, and the application for being FBG in engineering provides condition.
Description
Technical field
The invention belongs to sensory field of optic fibre, more particularly, to a kind of naked FBG strain transducer calibration device,
Calibration system and scaling method.
Background technique
Fiber bragg grating (FBG) is the light sensitive characteristic using fiber optic materials, with certain Writing Technology in bare fibre
A segment limit in write-in have periodic refractive index in-core body grating, Essential Action be in fibre core formed with resonance wave
When narrow band optical filter centered on length, wideband light source or tunable optical source output light pass through grating, with grating in spectrum
Narrow-band spectrum centered on wavelength is reflected at grating and is demodulated, other most of light transmission will occur and along original direction
Transmission.Under the action of ambient temperature, stress and so on physical quantities, refractive index will change FBG fibre core, so as to cause optical grating reflection
Center wavelength of light drift.This characteristic is the working principle of FBG sensor, and by detecting the variation of reflected light wavelength, you can get it
The variation of FBG sensor local environment measured physical quantity.
FBG strain transducer has small in size, light-weight, high sensitivity, electromagnetism interference as a kind of novel sensor
The advantages that ability is strong, is easy to implement real-time distributed measurement is very suitable to complex condition structural strain information long term monitoring work
Make, is widely used in the fields such as civil structure, ocean engineering, aerospace, it is more to stress, strain, temperature and vibration etc.
Parametric Detection has advantage outstanding, is just gradually replacing traditional sensor.
In order to guarantee the accuracy of measurement, FBG strain transducer needs to carry out it before use the mark of strain sensitivity
It is fixed.Currently, having had more possible ways for the calibration of packaged FBG strain transducer.Generally using curved
Square beam pastes FBG as basic structure, in Standard Beam, makes to generate strain on beam by applying load, beam table is obtained by calculation
The strain in face is to realize that the emergent property of FBG sensor is demarcated.It is passed as a kind of FBG of Publication No. CN207318047U is strained
Sensor dynamic calibration coupler and caliberating device, disclosing caliberating device includes the beam of uniform strength and shake table, the beam of uniform strength
Head end is fixed on bracket, and the output section connection of end and shake table, strain ga(u)ge and FBG sensor are bonded in the beam of uniform strength
On, acceleration transducer is bonded in the end of the beam of uniform strength.
In practical applications, the sensitivity coefficient of naked FBG strain transducer also needs accurately to be demarcated, but by
It is very fragile in naked FBG strain transducer, once being installed using conventional methods such as stickups, it is difficult fully to disassemble,
And it uses and the calibration mode of the existing caliberating device use to packaged FBG strain transducer answers naked FBG
Become sensor to be demarcated, there are the uncertain problems of strain transfer ratio, while existing caliberating device structure is more complex, is related to
Device it is more, higher cost, maintenance cost is high, is not able to satisfy the demand of practical implementation.And complicated caliberating device pair
The requirement of operator is stringent, needs operator to have operating experience abundant to overcome disassembly hardly possible, measurement accuracy to be not allowed
Problem.And accurate sensitivity coefficient is the important parameter for guaranteeing the accuracy and repeatability of measurement result, the prior art is still
Lack to the naked better scaling method of FBG strain transducer sensitivity coefficient.
Summary of the invention
Present invention solves the technical problem that being to overcome the deficiencies of existing technologies, strain biography can rationally be solved by providing one kind
The calibration device of the naked FBG strain transducer of rate problem is passed, which is particularly suitable for naked FBG strain transducer with device
Calibration, easy to operate, accuracy is high.
The object of the invention is achieved through the following technical solutions:
A kind of calibration device of naked FBG strain transducer is provided, including demarcates bottom plate and is separately positioned on the calibration
Calibration pedestal and micro-displacement generation device at the top of bottom plate；The calibration pedestal and micro-displacement generation device are respectively equipped with locating slot
And the elastic cushion of setting is matched with locating slot, the naked FBG strain transducer is fixed on calibration by locating slot and elastic cushion
Between pedestal and micro-displacement generation device；The calibration pedestal is fixedly connected with calibration bottom plate, and the micro-displacement generation device can
Relative to calibration bottom plate movement；It is done relative motion on calibration bottom plate by micro-displacement generation device, changes micro-displacement and generate dress
It sets at a distance between calibration pedestal, and then changes the wavelength of naked FBG strain transducer to be measured.
Further, the micro-displacement generation device includes lever, sliding platform and the micrometer for driving sliding platform；Thick stick
Bar is flexibly connected by support component with calibration bottom plate, and the side of lever one end, the side with lever is arranged in the sliding platform
Activation lever movement is connected, micrometer is connect with sliding platform；The other side of the lever other end is arranged in the calibration pedestal, wait mark
Fixed naked FBG strain transducer is fixed between calibration pedestal and lever.In the present solution, by rotation micrometer to drive sliding platform
It is mobile, and then drive the one end for the lever connecting with sliding platform mobile, so that lever is rotated by rotary shaft of support component,
Realize that the naked FBG strain transducer connecting with the lever other end is stretched.
Further, the support component includes the rotary shaft being fixedly connected with calibration bottom plate and is arranged inside lever
Bearing, the bearing and rotation axis connection.
Further, the adjusting ratio of the micro-displacement generation device is 1:200；Moved up on the right side of control lever
200um, lever left side move down 1um.Under this adjusting ratio, adjusts and be more convenient, precision is higher.
Further, the locating slot is equipped with the location hole being arranged in pairs, and the elastic cushion uses rubber pad, the rubber
Pad is equipped with the mounting hole that setting is matched with location hole, by the way that screw to be passed through to the location hole and mounting hole of matching setting, Ke Yishi
The fixed installation of existing rubber pad and locating slot, and then realize the fixation to naked FBG strain transducer.Using screw to locating slot
The mounting hole of location hole and rubber pad carries out Matching installation, does not influence the strain transfer ratio of naked FBG strain transducer not only, but also
It dismantles, is easy for installation.
Further, longitudinal locating slot for being equipped with multiple grades side by side on the calibration pedestal, can be by adjusting naked FBG
Strain transducer accesses the grade of locating slot, and then adjusts the grid region length of naked FBG strain transducer.
Further, the grid region length range is 5mm to 10mm.
Another object of the present invention is to provide a kind of calibration systems of naked FBG strain transducer, including above-mentioned calibration
The sequentially connected fiber grating solution in one end with device and with the naked FBG strain transducer being fixed on the calibration device
Adjust instrument and host computer.
A further object of the present invention is to provide a kind of scaling methods of the calibration system of naked FBG strain transducer, including
Step:
S1. above-mentioned calibration system is built, calibration device is made to be in temperature constant state；Due in determining FBG sensor
In, the period of grating is determined by strain and temperature, during the calibration process, so that calibration is in temperature constant state with device, to avoid
Influence of the temperature to result；
S2. the grid region length of naked FBG strain transducer to be calibrated is set；
S3. the central wavelength of naked FBG strain transducer to be calibrated in a free state is measured；
S4. make micro-displacement generation device relative Calibration pedestal mobile, stretch naked FBG strain transducer, repeatedly record stretches
Relationship between length and the wavelength change of naked FBG strain transducer；
S5. record numerical value is brought intoWherein N is the number of duplicate measurements, s
(Kε) be experimental result standard deviation, KεiFor i-th test ga(u)ge factor,For the strain sensitivity of n times test
The average of coefficient.
Further, the micro-displacement generation device includes lever, sliding platform and micrometer；The lever is answered with naked FBG
Become the connected side of sensor and be equipped with support component, the other side of the lever is connect with sliding platform, the sliding platform also with divide
Li card connection；The support component includes and demarcates the rotary shaft that bottom plate is fixedly connected and the bearing being arranged in inside lever,
The bearing and rotary shaft are interference fitted；The step S4 is specifically included:
S41. micrometer is rotated, sliding platform and lever junction extend, so that control lever is using support component as axis, with cunning
The connected side of moving stage rotates upwards, and the side being connected with naked FBG strain transducer is rotated down, and then stretches naked FBG strain
The length of sensor；
S42. single experiment refers to being loaded into 1000 μ ε, every naked FBG strain transducer 2um of stretching from 0 μ ε loads 200 μ ε；
N times experiment is repeated, i.e., repeatedly n times from 0 μ ε are loaded into 1000 μ ε, for improving the accuracy of measurement data, reduce experimental error；
S43. the tensile elongation of naked FBG strain transducer and corresponding wavelength change are recorded respectively.
Compared with prior art, the invention has the following advantages:
(1) few due to introducing non-linear factor, this method has the fabulous linearity；The uniform drawing to optical fiber may be implemented
It stretches；
(2) by the way that the both ends of naked FBG strain transducer are separately positioned between locating slot and rubber pad, then pass through fixation
Locating slot and rubber pad is fixed in device, this kind can glue the mounting means of naked FBG strain transducer to avoid traditional
Mounted mounting means is to influence caused by strain transmitting；
(3) it is equipped with multi-grade locating slot, the sensitivity coefficient of the naked FBG strain transducer suitable for different grid region length
Calibration, has a wide range of application, strong applicability；
(4) operation is extremely easy；
In the actual operation process, it is dismounted easily first, Repeatability is good；Naked FBG strain transducer to be measured changes stickup
Traditional approach, using special locating slot and elastic cushion, be dismounted easily and meanwhile do not influence strain transmitting；
Secondly operating procedure is easy, can calculate the strain length of naked FBG strain transducer by rotating micrometer,
Observe fiber Bragg grating (FBG) demodulator, host computer you can get it registration；
The maintenance cost of equipment is lower, and failure rate is less；It is easy to operate, only need simple training that can precisely measure experiment knot
Fruit, to the specialized capability of experimenter without particular/special requirement；
To sum up, this method is simply easily achieved, and while at low cost, easy to operate, using the present invention to demarcate can be with
The good linearity and uncertainty are obtained, the Accurate Calibration of naked FBG strain transducer may be implemented；The present invention is highly suitable for
Practical implementation.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that device is used in the naked FBG strain transducer calibration；
Fig. 2 is the cross-sectional view that the face device C-C is used in the naked FBG strain transducer calibration；
Fig. 3 is the lever and the scheme of installation for demarcating bottom plate；
Fig. 4 is the connection schematic diagram of the sliding platform and micrometer；
Fig. 5 is the structural schematic diagram of the naked FBG strain transducer calibration system；
Fig. 6 is the flow chart of the naked FBG strain transducer scaling method.
Wherein, 1- demarcates bottom plate, 2- lever, and 3- slides platform, 4- micrometer, and 5- demarcates pedestal, 6- locating slot, 7- positioning
Hole, 8- rotary shaft, 9- bearing, 10- rubber pad, 11- mounting hole, the naked FBG strain transducer of 12-, 13- fiber Bragg grating (FBG) demodulator,
14- host computer, 15- support component.
Specific embodiment
The present invention is further illustrated With reference to embodiment, wherein attached drawing only for illustration,
What is indicated is only schematic diagram, rather than pictorial diagram, should not be understood as the limitation to this patent；Reality in order to better illustrate the present invention
Example is applied, the certain components of attached drawing have omission, zoom in or out, and do not represent the size of actual product；To those skilled in the art
For, the omitting of some known structures and their instructions in the attached drawings are understandable.
Embodiment 1
As shown in Figures 1 to 4, a kind of calibration device of naked FBG strain transducer is provided, including demarcates bottom plate 1 and divides
The calibration pedestal 5 and micro-displacement generation device at 1 top of calibration bottom plate are not set；Demarcate pedestal 5 and the fixed company of calibration bottom plate 1
It connects, micro-displacement generation device can be relatively moved with calibration bottom plate 1.Micro-displacement generation device includes lever 2, sliding platform 3 and divides
Li card 4；The side that lever 2 is connected with naked FBG strain transducer 12 be equipped with support component 15, the other side of lever 2 successively with cunning
Moving stage 3 and micrometer 4 connect.Support component 15 includes the rotary shaft 8 being fixedly connected with calibration bottom plate 1 and is arranged in lever 2
Internal bearing 9, bearing 9 and rotary shaft 8 are interference fitted.
The side of 2 one end of lever is arranged in sliding platform 3, and sliding platform 3 connect the movement of activation lever 2 with the side of lever 2；Mark
Determine the other side that 2 other end of lever is arranged in pedestal 5, naked FBG strain transducer 12 to be calibrated is fixed on calibration pedestal 5 and lever
Between 2.
As shown in Figure 1, the working principle of this calibration device are as follows: rotation micrometer 4, sliding platform 3 are stretched with 2 junction of lever
Long, so that control lever 2 is axis with support component 15, the side being connected with sliding platform 3 rotates upwards, as shown in Figure 1 counterclockwise
Rotation；The side being connected with naked FBG strain transducer 12 is rotated down, and then stretches the length of naked FBG strain transducer 12.Together
Reason reversely rotates micrometer 4, can shorten the length of naked FBG strain transducer 12.Naked FBG strain transducer 12 is in lever 2
It can produce the micro-displacement that precision is 5nm under effect.Wherein, the ratio of lever 2 is 1:200, that is, passes through rotation micrometer 4, control
The laterally moved 200um of connection of lever 2 processed and sliding platform 3, the other side of lever 2 moves down 1um.The precision of micrometer 4
For 1um.On lever 2, it is equipped with card slot with the junction of sliding platform 3, for limiting the sliding scale of sliding platform 3, improves control
Precision.
Locating slot 6 is respectively equipped at calibration pedestal 5 and corresponding lever 2 and the rubber pad of setting is matched with locating slot 6
10；Meanwhile the locating slot 6 for being longitudinally equipped with multiple grades is demarcated on pedestal 5, it can be connect by adjusting naked FBG strain transducer 12
The grade for entering locating slot 6 controls naked 12 initial length of FBG strain transducer, and then adjusts the grid region of naked FBG strain transducer 12
Length；Grid region length range is 5mm to 10mm.Locating slot 6 includes the location hole 7 that is arranged in pairs, and rubber pad 10 is equipped with therewith
One end of naked FBG strain transducer 12 is placed on the locating slot 6 and rubber pad 10 of calibration pedestal 5 by the mounting hole 11 with setting
Between, the other end of naked FBG strain transducer 12 is placed between the locating slot 6 of lever 2 and rubber pad 10, then distinguishes screw
Across location hole 7 and mounting hole 11, rubber pad 10 is pressed on corresponding locating slot 6, thus to naked FBG strain transducer 12
Both ends be fixed.
By the way that the both ends of naked FBG strain transducer 12 are separately positioned between locating slot 6 and rubber pad 10, then by solid
Determine device locating slot 6 and rubber pad 10 is fixed, this kind, can be to avoid to the mounting means of naked FBG strain transducer 12
The mounting means of traditional adhesive type is to influence caused by strain transmitting.And use screw to the location hole 7 of locating slot 6 and rubber
The mounting hole 11 of rubber mat 10 carries out the mounting means of Matching installation, does not influence the strain transmitting of naked FBG strain transducer 12 not only
Rate, and dismantle, is easy for installation.
Equipped with multi-grade locating slot 6, the sensitivity coefficient of the naked FBG strain transducer 12 suitable for different grid region length
Calibration, has a wide range of application, strong applicability.
The naked FBG strain transducer calibration device of the present embodiment, suitable for answering naked FBG strain transducer calibration
With；Strain of traditional mounting method generation to FBG strain transducer is changed, is dexterously devised with lever, sliding platform, very small amount
The micro-displacement apparatus of tooth composition it is few to introduce non-linear factor, so that subsequent pass naked strain to realize uniformly drawing high to optical fiber
The calibration of sensor, can with minimum cost, most easy operation realize accurately calibration measurement, effectively overcome the prior art
Unavoidable strain transfer ratio uncertain problem is actually difficult to the problem of dismantling.This naked strain transducer calibration device, knot
Structure is simple, is constituted using general part, and low in cost, easy to operate while result is reliable, is highly suitable for practical implementation, has
There is promotional value.
Embodiment 2
As shown in figure 5, being in place of the present embodiment and the difference of embodiment 1, a kind of naked FBG strain transducer 12 is also provided
Calibration system, including in embodiment 1 calibration device and be fixed on the calibration device naked FBG strain pass
The sequentially connected fiber Bragg grating (FBG) demodulator 13 in one end of sensor 12 and host computer 14.Fiber Bragg grating (FBG) demodulator issue light pass through with
Connected naked FBG strain transducer reflection after, the reflected light with specific central wavelength is again introduced into fiber grating demodulation
Instrument, demodulates the central wavelength of FBG, and is transferred on host computer and is shown.
The calibration system of the present embodiment is generated using the calibration device of embodiment 1 and measures naked FBG strain transducer and answered
Become, using fiber Bragg grating (FBG) demodulator and host computer, visual effect is good, operates convenient simple.
Embodiment 3
As shown in fig. 6, the present embodiment provides a kind of scaling methods of naked FBG strain transducer, comprising steps of
S1. calibration system is built, which includes calibration device, fiber Bragg grating (FBG) demodulator 13 in embodiment 1
With host computer 14；
Influence in order to avoid temperature to calibration result makes calibration system be in temperature constant state.
S2. by adjusting 6 grade of locating slot of naked FBG strain transducer 12 access to be calibrated, naked FBG to be calibrated is set
The grid region length of strain transducer 12；Specifically, the both ends of naked FBG strain transducer to be calibrated are separately fixed at calibration base
The rubber pad of seat and lever is fixed rubber pad in the following, screw is passed through locating slot again.
S3. naked FBG strain transducer is connected with fiber Bragg grating (FBG) demodulator, measures naked FBG strain transducer 12 to be calibrated
Central wavelength in a free state；
Specifically, the light for issuing fiber Bragg grating (FBG) demodulator 13 passes through the anti-of the naked FBG strain transducer 12 being attached thereto
After penetrating, the reflected light with specific central wavelength is again introduced into fiber Bragg grating (FBG) demodulator 13, and then demodulates the middle cardiac wave of FBG
It is long, and be transferred on host computer 14 and shown.
S4. make micro-displacement generation device relative Calibration pedestal 5 mobile, stretch naked FBG strain transducer 12, repeatedly record is drawn
Relationship between elongation and the wavelength change of naked FBG strain transducer 12；
Wherein, micro-displacement generation device includes lever 2, sliding platform 3 and micrometer 4；The lever 2 and naked FBG strain passes
The connected side of sensor 12 is equipped with support component 15, and the other side of the lever 2 is connect with platform 3 is slid, the sliding platform 3 also with
Micrometer 4 connects；The support component 15 includes the rotary shaft 8 being fixedly connected with calibration bottom plate 1 and is arranged inside lever 2
Bearing 9, the bearing 9 is interference fitted with rotary shaft 8.
Step S4 is specifically included:
S41. slowly rotation rotation micrometer 4, sliding platform 3 and 2 junction of lever extend, so that control lever 2 is to support
Component 15 is axis, and the side being connected with sliding platform 3 rotates upwards, and the side being connected with naked FBG strain transducer 12 is rotated down,
It rotates as illustrated by the arrows in fig. 1, and then stretches the length of naked FBG strain transducer 12；In the present embodiment, every stretching 2um is namely
200 μ ε of every load, observe the registration of fiber Bragg grating (FBG) demodulator, record the wavelength change of naked FBG strain transducer, since 0 μ ε
Until stretching 1000 μ ε；
S42. it repeats step S42N times, to overcome the contingency of single measurement；
Single experiment is to be loaded into 1000 μ ε, every naked FBG strain transducer 2um of stretching from 0 μ ε to load 200 μ ε；It repeats
N times experiment, i.e., repeatedly n times from 0 μ ε are loaded into 1000 μ ε, for improving the accuracy of measurement data, reduce experimental error；
S43. it records respectively and tests the tensile elongation of naked FBG strain transducer 12 and corresponding wavelength change every time.
S5. in determining FBG sensor, the period of grating is determined by strain and temperature.By theory of the fiber optical
It is found that the drift value of central wavelength is represented by Δ λB=Kεε+KTΔT.In formula: KεFor the strain sensitivity system of FBG sensor
Number, KTFor the temperature sensitivity coefficient of FBG sensor, ε is strained for FBG sensor, and Δ T is suffered temperature variation.When
When temperature change is 0, then the drift value of central wavelength can be written as: Δ λB=Kεε.As can be seen that theoretically, strain with
Wavelength shift is linear.Calculate ga(u)ge factor formula be
Wherein N is the number of duplicate measurements, s (Kε) be experimental result standard deviation, | for i-th test ga(u)ge factor,For the average of the ga(u)ge factor of n times test.
The numerical value of record is brought into above formula and is calculated.
The present invention is not suitable for asking for naked FBG strain transducer strain sensitivity coefficient calibration for tradition FBG scaling method
Topic proposes a kind of method for being easily suitble to naked FBG strain transducer calibration, and this method is simply easily achieved, and is convenient for naked FBG
Sensor dismounting avoids and pastes the strain problem of transmission for being not easy determination that installation generates.The scaling method can obtain well
The linearity and uncertainty, the application for being FBG in engineering provides condition.
Obviously, above-described embodiment is only intended to clearly illustrate technical solution of the present invention example, and is not
Restriction to embodiments of the present invention.For those of ordinary skill in the art, on the basis of the above description also
It can make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all
Made any modifications, equivalent replacements, and improvements etc. within the spirit and principles in the present invention should be included in right of the present invention and want
Within the protection scope asked.
Claims (10)
1. the calibration device of naked FBG strain transducer, which is characterized in that including calibration bottom plate and be separately positioned on the calibration
Calibration pedestal and micro-displacement generation device at the top of bottom plate；The calibration pedestal and micro-displacement generation device are respectively equipped with locating slot
And the elastic cushion of setting is matched with locating slot, the naked FBG strain transducer is fixed on calibration by locating slot and elastic cushion
Between pedestal and micro-displacement generation device；The calibration pedestal is fixedly connected with calibration bottom plate, and the micro-displacement generation device can
Relative to calibration bottom plate movement；It is done relative motion on calibration bottom plate by micro-displacement generation device, changes micro-displacement and generate dress
It sets at a distance between calibration pedestal, and then changes the wavelength of naked FBG strain transducer to be measured.
2. the calibration device of naked FBG strain transducer according to claim 1, which is characterized in that the micro-displacement produces
Generating apparatus includes lever, sliding platform and the micrometer for driving sliding platform；Lever passes through support component and calibration bottom plate activity
The side of lever one end is arranged in connection, the sliding platform, and activation lever movement, micrometer and sliding are connect with the side of lever
Platform connection；The other side of the lever other end is arranged in the calibration pedestal, and naked FBG strain transducer to be calibrated is fixed on calibration base
Between seat and lever.
3. the calibration device of naked FBG strain transducer according to claim 2, which is characterized in that the support component
Including the rotary shaft being fixedly connected with calibration bottom plate and the bearing being arranged in inside lever, the bearing and rotation axis connection.
4. the calibration device of naked FBG strain transducer according to claim 2 or 3, which is characterized in that the micro-displacement
The adjusting ratio of generation device is 1:200.
5. the calibration device of naked FBG strain transducer according to claim 1, which is characterized in that the locating slot is set
There is the location hole being arranged in pairs, the elastic cushion uses rubber pad, and the rubber pad is equipped with the mounting hole to match with location hole,
By the way that screw is passed through location hole and mounting hole, to realize the fixed installation of rubber pad and locating slot, and then realizes and naked FBG is answered
Become the fixation of sensor.
6. the calibration device of naked FBG strain transducer according to claim 1 or 5, which is characterized in that the calibration base
Longitudinal locating slot for being equipped with multiple grades side by side on seat, can access the grade of locating slot by adjusting naked FBG strain transducer,
And then adjust the grid region length of naked FBG strain transducer.
7. the calibration device of naked FBG strain transducer according to claim 6, which is characterized in that the grid region length
Range is 5mm to 10mm.
8. a kind of calibration system of naked FBG strain transducer, which is characterized in that including as claimed in any one of claims 1 to 6
Calibration device and the sequentially connected optical fiber light in one end with the naked FBG strain transducer being fixed on the calibration device
Grid (FBG) demodulator and host computer.
9. a kind of scaling method of the calibration system of naked FBG strain transducer, which is characterized in that comprising steps of
S1. calibration system according to any one of claims 8 is built, calibration device is made to be in temperature constant state；
S2. the grid region length of naked FBG strain transducer to be calibrated is set；
S3. the central wavelength of naked FBG strain transducer to be calibrated in a free state is measured；
S4. make micro-displacement generation device relative Calibration pedestal mobile, stretch naked FBG strain transducer, repeatedly record tensile elongation
Relationship between the wavelength change of naked FBG strain transducer；
S5. record numerical value is brought intoWherein N is the number of duplicate measurements, s (Kε) be
The standard deviation of experimental result, KεiFor i-th test ga(u)ge factor,For the ga(u)ge factor of n times test
Average.
10. the scaling method of the calibration system of naked FBG strain transducer according to claim 9, which is characterized in that described
Micro-displacement generation device includes lever, sliding platform and micrometer；The side that the lever is connected with naked FBG strain transducer is equipped with
The other side of support component, the lever is connect with sliding platform, and the sliding platform is also connect with micrometer；The support component packet
It includes the rotary shaft being fixedly connected with calibration bottom plate and the bearing being arranged in inside lever, the bearing is matched with rotary shaft interference
It closes；The step S4 is specifically included:
S41. micrometer is rotated, sliding platform and lever junction extend, so that control lever is using support component as axis, with sliding platform
Connected side rotates upwards, and the side being connected with naked FBG strain transducer is rotated down, and then stretches naked FBG strain sensing
The length of device；
S42. single experiment is to be loaded into 1000 μ ε, every naked FBG strain transducer 2um of stretching from 0 μ ε to load 200 μ ε；It repeats
N times experiment, i.e., repeatedly n times from 0 μ ε are loaded into 1000 μ ε, improve the accuracy of measurement data, reduce experimental error；
S43. the tensile elongation of naked FBG strain transducer and corresponding wavelength change are recorded respectively.
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