CN106871810B - Calibration method, device and system of fiber grating strain sensor - Google Patents
Calibration method, device and system of fiber grating strain sensor Download PDFInfo
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- CN106871810B CN106871810B CN201710195566.8A CN201710195566A CN106871810B CN 106871810 B CN106871810 B CN 106871810B CN 201710195566 A CN201710195566 A CN 201710195566A CN 106871810 B CN106871810 B CN 106871810B
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- 239000000835 fiber Substances 0.000 title claims abstract description 311
- 238000000034 method Methods 0.000 title claims abstract description 62
- 230000035945 sensitivity Effects 0.000 claims abstract description 17
- 239000013307 optical fiber Substances 0.000 claims description 37
- 230000006870 function Effects 0.000 claims description 23
- 230000008569 process Effects 0.000 claims description 21
- 238000012886 linear function Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
Abstract
The invention discloses a calibration method, a device and a system of a fiber grating strain sensor. The calibration method comprises the following steps: acquiring a function relation between the wavelength of a calibrated fiber grating temperature sensor and the stretching deformation; acquiring a function relation of wavelengths between a fiber grating strain sensor to be calibrated and a fiber grating temperature sensor in a preset calibration environment; and calculating the functional relation between the wavelength of the fiber grating strain sensor and the tensile deformation amount through the functional relation between the wavelength of the fiber grating temperature sensor and the tensile deformation amount and the functional relation between the wavelength of the fiber grating strain sensor to be calibrated and the wavelength of the fiber grating temperature sensor, and calibrating the sensitivity coefficient of the fiber grating strain sensor. According to the calibration method of the fiber grating strain sensor provided by the embodiment of the invention, the fiber grating strain sensor can be indirectly calibrated through the fiber grating temperature sensor, so that the nondestructive calibration of the fiber grating strain sensor is realized.
Description
Technical field
The present invention relates to the scaling methods of photoelectric measuring device field more particularly to fiber Bragg grating strain sensor, device
And system.
Background technique
Fiber-optic grating sensor (Fiber Bragg Grating Sensor) is the wavelength using bragg grating
To temperature and strain etc. physical quantitys sensitivity characteristic and a kind of manufactured fibre optical sensor.Compared with traditional fibre optical sensor,
Fiber-optic grating sensor converts information measured to the movement of resonant wavelength, i.e., sensing letter is obtained using wavelength modulation system
Breath.Due to the highly sensitive of fiber-optic grating sensor, high-precision, high stability and stronger anti-electromagnetic interference capability, fiber grating
Sensor is widely used in fields such as aerospace, civil engineering, composite material, petrochemical industries.
As fiber-optic grating sensor demand increasingly increases, measurement accuracy is required also increasingly to improve.For example, existing
The method of calibration fiber Bragg grating strain sensor usually requires for fiber Bragg grating strain sensor to be calibrated to be pasted onto as certain
Then part surface applies pulling force to fiber Bragg grating strain sensor to be calibrated, obtain fiber Bragg grating strain sensor in difference
The output wave long value and pulling force indicating value of the working condition of test point, obtain fiber Bragg grating strain sensor to be calibrated by operation
Output wavelength and stress relationship.
Fiber Bragg grating strain sensor to be calibrated is during the calibration process since deformation occurs for stress, after the completion of calibration
It is unable to normal use.Therefore, certain proportion is taken to be sampled calibration to fiber Bragg grating strain sensor under normal conditions.Due to
The presence of sensor individuals difference, sampling calibration coefficient not can guarantee measurement accuracy there are deviation, and be sampled transducer calibration
After can not reuse, cause to waste.
Summary of the invention
The embodiment of the present invention provides the scaling method of fiber Bragg grating strain sensor, device and system, using fiber grating
Temperature sensor indirectly demarcates fiber Bragg grating strain sensor, and calibration process does not destroy sensor, realizes to each light
Fiber grating strain transducer is individually demarcated, and is exempted individual difference and is brought error.
One side according to an embodiment of the present invention provides a kind of scaling method of fiber Bragg grating strain sensor, comprising: obtain
Take the wavelength of calibrated fiber grating temperature sensor and the functional relation of stretcher strain amount；Obtain preset calibrations environment in
The functional relation of wavelength between the fiber Bragg grating strain sensor and fiber grating temperature sensor of calibration；Pass through optical fiber grating temperature
The wavelength of sensor and the functional relation of stretcher strain amount and fiber Bragg grating strain sensor to be calibrated and fiber grating temperature
The functional relation of wavelength, calculates the wavelength of fiber Bragg grating strain sensor and the functional relation of stretcher strain amount between degree sensor,
Demarcate the sensitivity coefficient of fiber Bragg grating strain sensor.
According to another aspect of an embodiment of the present invention, a kind of caliberating device of fiber Bragg grating strain sensor is provided, comprising:
Deformation relationship obtains module, for obtaining the wavelength of calibrated fiber grating temperature sensor and the function pass of stretcher strain amount
System；Wavelength relationship obtains module, for obtaining fiber Bragg grating strain sensor and optical fiber light to be calibrated in preset calibrations environment
The functional relation of wavelength between grid temperature sensor；Parameter calibration module, for by the wavelength of fiber grating temperature sensor with
Wavelength between the functional relation of stretcher strain amount and fiber Bragg grating strain sensor to be calibrated and fiber grating temperature sensor
Functional relation, calculate the wavelength of fiber Bragg grating strain sensor and the functional relation of stretcher strain amount, calibration fiber grating is answered
Become the sensitivity coefficient of sensor.
It is according to an embodiment of the present invention in another aspect, providing a kind of calibration system of fiber Bragg grating strain sensor, comprising:
Memory, for storing program；Processor, the program for storing in run memory, to execute following steps: acquisition has been marked
The wavelength of fixed fiber grating temperature sensor and the functional relation of stretcher strain amount；It obtains to be calibrated in preset calibrations environment
The functional relation of wavelength between fiber Bragg grating strain sensor and fiber grating temperature sensor；Pass through fiber grating temperature sensor
Wavelength and stretcher strain amount functional relation and fiber Bragg grating strain sensor and fiber grating temperature sensor to be calibrated
The functional relation of wavelength between device calculates the wavelength of fiber Bragg grating strain sensor and the functional relation of stretcher strain amount, nominal light
The sensitivity coefficient of fiber grating strain transducer；Display, for showing the sensitivity coefficient of fiber Bragg grating strain sensor.
The scaling method of fiber Bragg grating strain sensor according to embodiments of the present invention, device and system, use one
Other fiber Bragg grating strain sensors of fiber grating temperature sensor indirect calibration, it is simple to operation, make conducive to industrial mass
With calibration process will not destroy sensor, and the calibration to each fiber Bragg grating strain sensor quick nondestructive may be implemented.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, will make below to required in the embodiment of the present invention
Attached drawing is briefly described, for those of ordinary skill in the art, without creative efforts, also
Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 is the flow chart for showing the scaling method of fiber Bragg grating strain sensor according to an embodiment of the invention；
Fig. 2 be obtained in Fig. 1 fiber grating temperature sensor wavelength and the functional relation of stretcher strain amount it is detailed
Flow chart；
Fig. 3 is the functional relation that wavelength between fiber Bragg grating strain sensor and fiber grating temperature sensor is obtained in Fig. 1
Detailed flow chart；
Fig. 4 is the structural schematic diagram of the caliberating device of fiber Bragg grating strain sensor according to an embodiment of the invention；
Fig. 5 is the detailed structural schematic diagram that deformation relationship obtains module in Fig. 4；
Fig. 6 is the detailed structural schematic diagram of Fig. 4 medium wavelength Relation acquisition module；
Fig. 7 is to show the scaling method and device of realizing fiber Bragg grating strain sensor according to an embodiment of the present invention
The structure chart of the exemplary hardware architecture of the calibration system of fiber Bragg grating strain sensor.
In the accompanying drawings, identical component uses identical appended drawing reference, and description of symbols is as follows:
410- deformation relationship obtains module；420- wavelength relationship obtains module；430- parameter calibration module；
411- deformation quantity and wavelength value acquiring unit；412- deformation function solving unit；
421- wavelength value acquiring unit；422- function of wavelength solving unit；
The calibration system of 700- fiber Bragg grating strain sensor；701- input equipment；702- input interface；703- centre
Manage device；704- memory；705- output interface；706- output equipment；710- bus.
Specific embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below, in order to make mesh of the invention
, technical solution and advantage be more clearly understood, with reference to the accompanying drawings and embodiments, the present invention is further retouched in detail
It states.It should be understood that specific embodiment described herein is only configured to explain the present invention, it is not configured as limiting the present invention.
To those skilled in the art, the present invention can be real in the case where not needing some details in these details
It applies.Below the description of embodiment is used for the purpose of better understanding the present invention to provide by showing example of the invention.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence " including ... ", it is not excluded that including
There is also other identical elements in the process, method, article or equipment of the element.
In embodiments of the present invention, fiber-optic grating sensor at work, the variation of the physical quantitys such as temperature or strain and institute
Caused pitch variation is in a linear relationship, and optical grating reflection wavelength changes and linear change with pitch.Specifically, fiber grating reflects
The central wavelength of light depends on the fringe spacing of grating, and the fringe spacing of grating depends on the strain of temperature or application.It utilizes
The characteristic of fiber grating pair temperature and strain sensitive carries out certain encapsulation to grating, that is, can measure makes fiber grating generate shape
Physical quantity of change, such as temperature, strain, pressure, displacement, acceleration etc..
In scientific measurement, calibration, which is one, cannot be neglected important step.Calibration refers to the metrical instrument using standard
The precision of used instrument is detected, determines the relationship between the input quantity and output quantity of used instrument.In the present invention
In embodiment, the calibration to fiber Bragg grating strain sensor is the fiber grating temperature sensor using standard to light to be calibrated
The precision of fiber grating strain transducer is detected, and determines the input quantity and output quantity of fiber Bragg grating strain sensor to be calibrated
Between relationship.
In order to better understand the present invention, below in conjunction with attached drawing, optical fiber light according to an embodiment of the present invention is described in detail
The scaling method of grid strain transducer, device and system, it should be noted that these embodiments are not disclosed by the invention for limiting
Range.
Fig. 1 is the flow chart for showing the scaling method of fiber Bragg grating strain sensor according to an embodiment of the present invention.Such as Fig. 1
It is shown, the scaling method 100 of the fiber Bragg grating strain sensor in the present embodiment the following steps are included:
Step S110 obtains the wavelength of calibrated fiber grating temperature sensor and the functional relation of stretcher strain amount.
Step S120 obtains fiber Bragg grating strain sensor and calibrated optical fiber light to be calibrated in preset calibrations environment
The functional relation of wavelength between grid temperature sensor.
Step S130 passes through the wavelength of fiber grating temperature sensor and the functional relation and optical fiber of stretcher strain amount
The functional relation of wavelength between grating strain transducer and fiber grating temperature sensor, calculates the wave of fiber Bragg grating strain sensor
The long functional relation with stretcher strain amount, demarcates the sensitivity coefficient of fiber Bragg grating strain sensor.
The scaling method of fiber Bragg grating strain sensor according to an embodiment of the present invention, by calibrated optical fiber grating temperature
Sensor obtains the wavelength of fiber grating temperature sensor and the relational expression of stretcher strain amount as standard source, and obtains calibration
When the temperature change of environment, the wavelength of calibrated fiber grating temperature sensor and fiber Bragg grating strain sensor to be calibrated
Wavelength between wavelength functional relation relational expression, optical fiber light to be calibrated can be calculated by two above relational expression
The wavelength of grid strain transducer and the functional relation of stretcher strain amount, to obtain the sensitivity coefficient of sensor to be calibrated.
Fig. 2 is the wavelength that calibrated fiber grating temperature sensor is obtained in Fig. 1 and the functional relation of stretcher strain amount
Detailed flow chart, step Fig. 2 identical or equivalent with Fig. 1 use identical label.As shown in Fig. 2, step S110 is specific
May include:
Step S111, the stretching optical fiber grating temperature sensor in the range of calibrated fiber grating temperature sensor,
Obtain in drawing process stretcher strain amount of the fiber grating temperature sensor at different measuring points and corresponding with stretcher strain amount
Wavelength.
Step S112, based at different measuring points stretcher strain amount and wavelength corresponding with stretcher strain amount, calculate optical fiber
The wavelength of grating temperature sensor and the functional relation of stretcher strain amount.
In step S111, the standard for the fiber grating temperature sensor that fiber Bragg grating strain sensor is demarcated itself
Exactness be it is standard compliant, i.e., be calibrated as the fiber grating temperature sensor of standard source, so that ensureing is made
Fiber Bragg grating strain sensor be calibrated after precision.
How to be stretched in the range of calibrated fiber grating temperature sensor in order to make it easy to understand, being described in detail below
The fiber grating temperature sensor, and obtain stretcher strain of the fiber grating temperature sensor at different measuring points in drawing process
The process of amount and wavelength corresponding with stretcher strain amount.
In some embodiments, fiber grating temperature sensor is fixed on standard tension test piece center, optical fiber light
Grid temperature sensor deformation direction and universal tensile the machine direction that is stretched are overlapped.It is passed using universal tensile machine in optical fiber grating temperature
The fiber grating temperature sensor is stretched in the range of sensor, selectes different measuring points during stretching, and in selected difference
The stretcher strain amount of fiber grating temperature sensor is recorded at side point respectively, and records fiber grating using fiber Bragg grating (FBG) demodulator
The wavelength corresponding with stretcher strain amount of temperature sensor.
In this embodiment, the unit of the range of fiber grating temperature sensor is μ ε, indicates microstrain；Universal tensile machine
The unit of the stretcher strain amount of the fiber grating temperature sensor of record is pm, indicates micromicron, i.e. one meter of trillionth.
Also, in order to ensure stretcher strain amount that fiber grating temperature sensor measures at different measuring points and corresponding with stretcher strain amount
Wavelength data precision, universal tensile machine involved in above-described embodiment is the equipment by calibration.
In some embodiments, the quantity for recording selected different measuring points during stretching is two or more,
That is, the stretching for needing to be recorded fiber grating temperature sensor at least at two different measuring points using universal tensile machine is become
Shape amount and corresponding wavelength value.
In some embodiments, step S112 can specifically include following steps:
Step S112-1 constructs the wavelength of fiber grating temperature sensor and the first linear functional relation of stretcher strain amount
Expression formula.
Specifically, the first linear functional relation expression formula is x=k1L+b, wherein L is fiber grating temperature sensor
Stretcher strain amount, x are the wavelength corresponding with stretcher strain amount of fiber grating temperature sensor, k1For the first linear coefficient and k1
≠ 0, b are first constant term coefficient.
Step S112-2 obtains stretcher strain amount in two different measuring points at each measuring point and corresponding with stretcher strain amount
Wavelength.
Step S112-3, according at each measuring point stretcher strain amount and wavelength corresponding with stretcher strain amount, calculate the
The first linear coefficient and first constant term coefficient of one linear functional relation expression formula, obtain the wave of fiber grating temperature sensor
The long functional relation with stretcher strain amount.
As an example, stretcher strain amount L is obtained in measuring point 11With with stretcher strain amount L1Corresponding wavelength x1, and
Stretcher strain amount L is obtained in measuring point 22With with stretcher strain amount L2Corresponding wavelength x2, according to L1、x1、L2And x2Solve first
Linear functional relation expression formula x=k1L+b obtains k1With the value of b, so that it is determined that the stretching of fiber grating temperature sensor becomes
The functional relation of shape amount and wavelength.
Due to building to the functional relation of the stretcher strain amount of fiber grating temperature sensor and wavelength in above-described embodiment
Vertical process will not damage fiber grating temperature sensor, obtain calibrated fiber grating temperature sensor in difference
It, can be by fiber grating temperature sensor from standard after stretcher strain amount and wavelength corresponding with stretcher strain amount at measuring point
Pull test workpiece centre removes, and is fitted into fiber grating marking apparatus or is fixed in fiber grating marking apparatus, is being changed without optical fiber
In the case where grating temperature sensor, it can be repeatedly used for the subsequent calibration to other fiber Bragg grating strain sensors.
Fig. 3 is the functional relation that wavelength between fiber Bragg grating strain sensor and fiber grating temperature sensor is obtained in Fig. 1
Detailed flow chart, step Fig. 3 identical or equivalent with Fig. 1 use identical label.As shown in figure 3, step S120 is specific
May include:
Step S121 adjusts fiber Bragg grating strain sensor and calibrated fiber grating temperature sensor institute to be calibrated
In the temperature of calibration environment, wavelength and optical fiber grating temperature biography that different temperatures is worth corresponding fiber Bragg grating strain sensor are obtained
The wavelength of sensor.
Step S122 is worth the wavelength of corresponding fiber Bragg grating strain sensor based on different temperatures and optical fiber grating temperature passes
The wavelength of sensor calculates the functional relation of wavelength between fiber Bragg grating strain sensor and fiber grating temperature sensor.
In step S121, calibration environment can be fiber-optic grating sensor marking apparatus, the optical fiber in the embodiment of the present invention
Grating sensor marking apparatus may include battery or power, heating plate, sensor stand and shell.
Fiber Bragg grating strain sensor to be calibrated and calibrated fiber grating temperature sensor are put into fiber grating mark
Determine in instrument, and in fiber Bragg grating strain sensor to be calibrated and the use temperature range for having demarcated fiber grating temperature sensor
Adjust the temperature change in fiber grating marking apparatus, when recording different temperatures value corresponding fiber grating temperature sensor wavelength and
Fiber Bragg grating strain sensor wavelength.
In some embodiments, the quantity that selected different temperatures value is recorded in temperature adjustment process is two or two
More than.That is, needing to record the wavelength x and optical fiber light of at least fiber grating temperature sensor in two different temperatures values
The wavelength y of grid strain transducer.
In some embodiments, step S122 can specifically include following steps:
Step S122-1 constructs the of the wavelength of fiber Bragg grating strain sensor and the wavelength of fiber grating temperature sensor
Bilinear functional relation expression formula.
Specifically, the second linear functional relation expression formula is y=k2X+c, wherein x is the corresponding light of temperature value obtained
The wavelength of fine grating temperature sensor, y are the wavelength of the corresponding fiber Bragg grating strain sensor of temperature value obtained, k2It is second
Linear coefficient and k2≠ 0, c are second constant term coefficient.
Step S122-2, obtain the corresponding fiber Bragg grating strain sensor of each temperature value in two temperature values wavelength and
The wavelength of fiber grating temperature sensor.
Step S122-3, according to the wavelength and optical fiber grating temperature of the corresponding fiber Bragg grating strain sensor of each temperature value
The wavelength of sensor calculates the second linear coefficient and second constant term coefficient of the second linear functional relation expression formula, obtains light
The functional relation of wavelength between fiber grating strain transducer and fiber grating temperature sensor.
As an example, the fiber grating temperature sensor when temperature in record optical fiber optical grating calibration instrument is the first temperature value
The wavelength x of device1With fiber Bragg grating strain sensor wavelength y1, the temperature in fiber grating marking apparatus is adjusted, optical fiber grating mark is recorded
Determine the wavelength x of fiber grating temperature sensor when the temperature in instrument is second temperature value2With fiber Bragg grating strain sensor wavelength
y2, according to x1、y1、x2And y2 solves the second linear functional relation expression formula y=k2X+c obtains k2With the value of c, thus really
Determine the functional relation of the wavelength between the wavelength of fiber Bragg grating strain sensor and the wavelength of fiber grating temperature sensor.
In step s 130, by the wavelength of the fiber grating temperature sensor determined in above-described embodiment and stretcher strain amount
Functional relation x=k1L+b substitutes into fiber Bragg grating strain sensor and optical fiber grating temperature to be calibrated in the embodiment of the present invention
The functional relation y=k of wavelength between sensor2X+c obtains fiber Bragg grating strain sensor wavelength y and stretcher strain to be calibrated
Measure the functional relation y=k of L2k1L+k2B+c, wherein k2k1For the sensitivity coefficient of fiber Bragg grating strain sensor to be calibrated.
The scaling method of the fiber Bragg grating strain sensor provided according to embodiments of the present invention, is passed using optical fiber grating temperature
Other fiber Bragg grating strain sensors of sensor indirect calibration, from the calibration environment in step S121 it is found that light as standard source
Fine grating temperature sensor repeatedly can be used to demarcate other fiber Bragg grating strain sensors in the case where being changed without, and be conducive to industry
Change batch to use.It, will not be right due to not changing the stress of fiber Bragg grating strain sensor to be calibrated in calibration process
Fiber Bragg grating strain sensor to be calibrated damages, therefore can carry out to fiber Bragg grating strain sensor to be calibrated single
Solely calibration avoids calibration bring equipment error of sampling to fiber Bragg grating strain sensor, to ensure that fiber grating strain passes
The precision of sensor.
With reference to the accompanying drawing, the caliberating device of fiber Bragg grating strain sensor according to an embodiment of the present invention is discussed in detail.
The structure that Fig. 4 shows the caliberating device for the fiber Bragg grating strain sensor that an embodiment provides according to the present invention is shown
It is intended to.As shown in figure 4, the caliberating device 400 of fiber Bragg grating strain sensor includes:
Deformation relationship obtains module 410, becomes for obtaining the wavelength of calibrated fiber grating temperature sensor and stretching
The functional relation of shape amount.
Wavelength relationship obtains module 420, for obtaining fiber Bragg grating strain sensor to be calibrated in preset calibrations environment
The functional relation of wavelength between fiber grating temperature sensor.
Parameter calibration module 430, for passing through wavelength and the functional relation of stretcher strain amount and the functional relation of wavelength, meter
The wavelength of fiber Bragg grating strain sensor and the functional relation of stretcher strain amount are calculated, the sensitive of fiber Bragg grating strain sensor is demarcated
Spend coefficient.
The caliberating device of fiber Bragg grating strain sensor according to an embodiment of the present invention, using fiber grating temperature sensor
Indirect calibration fiber Bragg grating strain sensor, calibration process do not damage fiber Bragg grating strain sensor, and fiber grating is answered in realization
Become the quick nondestructive calibration of sensor.
Fig. 5 is the detailed structural schematic diagram for showing deformation relationship in Fig. 4 and obtaining module.As shown in figure 5, deformation relationship obtains
Modulus block 410 can specifically include:
Deformation quantity and wavelength value acquiring unit 411, for the stretching optical fiber light in the range of fiber grating temperature sensor
Grid temperature sensor, obtain in drawing process stretcher strain amount of the fiber grating temperature sensor at different measuring points and with stretching
The corresponding wavelength of deflection.
Deformation function solving unit 412, for based on stretcher strain amount at different measuring points and corresponding with stretcher strain amount
Wavelength, calculate the wavelength of fiber grating temperature sensor and the functional relation of stretcher strain amount.
In this embodiment, the wavelength of calibrated fiber grating temperature sensor and the relationship of stretcher strain amount are obtained,
And fiber grating temperature sensor wavelength and fiber Bragg grating strain sensor to be calibrated wavelength between wavelength function
The relational expression of relationship, the functional relation for the subsequent wavelength for calculating fiber Bragg grating strain sensor and stretcher strain amount provide number
According to basis.And the process for obtaining these data will not damage fiber Bragg grating strain sensor to be calibrated, be conducive to
Improve the repeatability and economy of calibration process.
As alternative embodiment, deformation quantity and wavelength value acquiring unit 411 obtain stretcher strain amount at different measuring points and
When wavelength corresponding with stretcher strain amount, the quantity of the different measuring points of acquisition is two or more；And deformation function solution
Calculating unit 412 can specifically include:
Deformation function expression formula constructs subelement, for constructing the wavelength and stretcher strain amount of fiber grating temperature sensor
The first linear functional relation expression formula.
Specifically, the first linear functional relation expression formula is x=k1L+b, wherein L is fiber grating temperature sensor
Stretcher strain amount, x are the wavelength corresponding with stretcher strain amount of fiber grating temperature sensor, k1For the first linear coefficient and k1
≠ 0, b are first constant term coefficient.
Deformation quantity and wavelength value acquiring unit 411 are also used to obtain the stretcher strain in two different measuring points at each measuring point
Amount and wavelength corresponding with stretcher strain amount.
Deformation function solving unit 412 is also used to according to stretcher strain amount at each measuring point and corresponding with stretcher strain amount
Wavelength, calculate the first linear functional relation expression formula the first linear coefficient and first constant term coefficient, obtain fiber grating
The wavelength of temperature sensor and the functional relation of stretcher strain amount.
Fig. 6 is the detailed structural schematic diagram for showing Fig. 4 medium wavelength Relation acquisition module.As shown in fig. 6, wavelength relationship obtains
Modulus block 420 can specifically include:
Wavelength value acquiring unit 421, fiber Bragg grating strain sensor and optical fiber grating temperature for adjusting to be calibrated pass
The temperature of calibration environment where sensor, obtains wavelength and fiber grating that different temperatures is worth corresponding fiber Bragg grating strain sensor
The wavelength of temperature sensor.
Function of wavelength solving unit 422, for being worth the wavelength of corresponding fiber Bragg grating strain sensor based on different temperatures
With the wavelength of fiber grating temperature sensor, wavelength between fiber Bragg grating strain sensor and fiber grating temperature sensor is calculated
Functional relation.
As alternative embodiment, wavelength value acquiring unit 421 obtains different temperatures and is worth corresponding fiber grating strain sensor
When the wavelength of device and the wavelength of fiber grating temperature sensor, the quantity of the different temperatures value of acquisition is two or more,
And function of wavelength solving unit 422 can specifically include:
Function of wavelength expression formula constructs subelement, for constructing the wavelength and fiber grating temperature of fiber Bragg grating strain sensor
Spend the second linear functional relation expression formula of the wavelength of sensor.
Specifically, the second linear functional relation expression formula is y=k2X+c, wherein x is the corresponding light of temperature value obtained
The wavelength of fine grating temperature sensor, y are the wavelength of the corresponding fiber Bragg grating strain sensor of temperature value obtained, k2It is second
Linear coefficient and k2≠ 0, c are second constant term coefficient.
Wavelength value acquiring unit 421 is also used to obtain the corresponding fiber grating strain of each temperature value in two temperature values and passes
The wavelength of sensor and the wavelength of fiber grating temperature sensor.
Function of wavelength solving unit 422 is also used to the wavelength according to the corresponding fiber Bragg grating strain sensor of each temperature value
With the wavelength of fiber grating temperature sensor, the second linear coefficient and second constant of the second linear functional relation expression formula are calculated
Term coefficient obtains the functional relation of wavelength between fiber Bragg grating strain sensor and fiber grating temperature sensor.
In some embodiments, deformation relationship is obtained the optical fiber grating temperature that module 410 determines by parameter calibration module 430
The wavelength of sensor and the functional relation x=k of stretcher strain amount1L+b, substitute into wavelength relationship obtain module 420 determine wait mark
The functional relation y=k of wavelength between fixed fiber Bragg grating strain sensor and fiber grating temperature sensor2X+c, can be obtained to
The functional relation y=k of the fiber Bragg grating strain sensor wavelength y and stretcher strain amount L of calibration2k1L+k2B+c, wherein k2k1As
The sensitivity coefficient of fiber Bragg grating strain sensor to be calibrated.
The caliberating device of fiber Bragg grating strain sensor according to an embodiment of the present invention, by changing optical fiber light to be calibrated
Grid strain transducer local environment temperature, and force-free state, thus indirect using calibrated fiber grating temperature sensor
Fiber Bragg grating strain sensor is demarcated, realizes and the quick nondestructive of fiber Bragg grating strain sensor is demarcated.
The other details and figure 1 above of the caliberating device of fiber Bragg grating strain sensor according to an embodiment of the present invention are extremely schemed
The scaling method of the fiber Bragg grating strain sensor of 3 descriptions is similar, and details are not described herein.
In conjunction with the scaling method and dress of Fig. 1 to Fig. 6 fiber Bragg grating strain sensor according to an embodiment of the present invention described
Setting can be by removably or the calibration system of fiber Bragg grating strain sensor that is fixedly mounted on fiber grating marking apparatus
System is realized.Fig. 7 is the method and dress for showing the calibration that can be realized fiber Bragg grating strain sensor according to an embodiment of the present invention
The structure chart of the exemplary hardware architecture of the calibration system for the fiber Bragg grating strain sensor set.
As shown in fig. 7, the calibration system 700 of fiber Bragg grating strain sensor include input equipment 701, input interface 702,
Central processing unit 703, memory 704, output interface 705 and output equipment 706.Wherein, input interface 702, central processing
Device 703, memory 704 and output interface 705 are connected with each other by bus 710, and input equipment 701 and output equipment 706 divide
Not Tong Guo input interface 702 and output interface 705 connect with bus 710, and then the calibration system with fiber Bragg grating strain sensor
The other assemblies connection of system 700.
Specifically, input equipment 701 is received from outside (for example, the universal tensile machine at standard tension test piece center
And calibration system) input information, and by input interface 702 by input information be transmitted to central processing unit 703；Central processing
Device 703 is handled to generate output information input information based on the computer executable instructions stored in memory 704, will
Output information temporarily or permanently stores in memory 704, is then transmitted to output information by output interface 705 defeated
Equipment 706 out；Output equipment 706 supplies the external of calibration system 700 that output information is output to fiber Bragg grating strain sensor
User uses.
That is, the calibration system of fiber Bragg grating strain sensor shown in Fig. 7 also may be implemented as including: storage
There is the memory of computer executable instructions；And processor, the processor can be real when executing computer executable instructions
Now in conjunction with the scaling method and device of Fig. 1 to Fig. 6 fiber Bragg grating strain sensor described.Here, processor can with it is omnipotent
Stretching-machine and calibration system communication, to execute calculating based on the relevant information from universal tensile machine and/or calibration system
Machine executable instruction, to realize scaling method and device in conjunction with Fig. 1 to Fig. 6 fiber Bragg grating strain sensor described.
In one embodiment, the calibration system of fiber Bragg grating strain sensor shown in Fig. 7 may be implemented as wrapping
It includes: memory, for storing program；Processor, the program for being stored in run memory, to execute following steps: obtaining
The wavelength of calibrated fiber grating temperature sensor and the functional relation of stretcher strain amount；It obtains in preset calibrations environment wait mark
The functional relation of wavelength between fixed fiber Bragg grating strain sensor and fiber grating temperature sensor；It is passed by optical fiber grating temperature
The wavelength of sensor and the functional relation of stretcher strain amount and fiber Bragg grating strain sensor and optical fiber grating temperature to be calibrated
The functional relation of wavelength between sensor calculates the wavelength of fiber Bragg grating strain sensor and the functional relation of stretcher strain amount, mark
Determine the sensitivity coefficient of fiber Bragg grating strain sensor；Display, for showing the sensitivity system of fiber Bragg grating strain sensor
Number.
The calibration system of fiber Bragg grating strain sensor through the embodiment of the present invention, may be implemented to fiber grating strain
The calibration of sensor quick nondestructive.
In conclusion in the above embodiment of the invention, the calibration side of fiber Bragg grating strain sensor is described in detail
Method, device and system are not being damaged using calibrated fiber grating temperature sensor indirect calibration fiber Bragg grating strain sensor
In the case where bad fiber Bragg grating strain sensor determine fiber Bragg grating strain sensor input quantity and output quantity between relationship with
And the sensitivity coefficient of fiber Bragg grating strain sensor.
In some embodiments, the scaling method of fiber Bragg grating strain sensor described in the above embodiment of the present invention,
Device and system can also demarcate further types of fiber-optic grating sensor, such as optical fiber grating temperature to be calibrated
Sensor, fiber grating displacement sensor, fiber bragg grating pressure sensor, optical fibre grating acceleration sensor etc..
That is, using the thermally sensitive characteristic of fiber-optic grating sensor to be calibrated, the above embodiment of the present invention
The scaling method of middle fiber Bragg grating strain sensor, device and system, available wider application and protection.
It should be clear that the invention is not limited to specific configuration described above and shown in figure and processing.
For brevity, it is omitted here the detailed description to known method.In the above-described embodiments, several tools have been described and illustrated
The step of body, is as example.But method process of the invention is not limited to described and illustrated specific steps, this field
Technical staff can be variously modified, modification and addition after understanding spirit of the invention, or suitable between changing the step
Sequence.
Functional block shown in structures described above block diagram can be implemented as hardware, software, firmware or their group
It closes.When realizing in hardware, it may, for example, be electronic circuit, specific integrated circuit (ASIC), firmware appropriate, insert
Part, function card etc..When being realized with software mode, element of the invention is used to execute program or the generation of required task
Code section.Perhaps code segment can store in machine readable media program or the data-signal by carrying in carrier wave is passing
Defeated medium or communication links are sent." machine readable media " may include any medium for capableing of storage or transmission information.
The example of machine readable media includes electronic circuit, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), soft
Disk, CD-ROM, CD, hard disk, fiber medium, radio frequency (RF) link, etc..Code segment can be via such as internet, inline
The computer network of net etc. is downloaded.
It should also be noted that, the exemplary embodiment referred in the present invention, is retouched based on a series of step or device
State certain methods or system.But the present invention is not limited to the sequence of above-mentioned steps, that is to say, that can be according in embodiment
The sequence referred to executes step, may also be distinct from that the sequence in embodiment or several steps are performed simultaneously.
The above description is merely a specific embodiment, it is apparent to those skilled in the art that,
For convenience of description and succinctly, the system, module of foregoing description and the specific work process of unit can refer to preceding method
Corresponding process in embodiment, details are not described herein.It should be understood that scope of protection of the present invention is not limited thereto, it is any to be familiar with
Those skilled in the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or substitutions,
These modifications or substitutions should be covered by the protection scope of the present invention.
Claims (15)
1. a kind of scaling method of fiber Bragg grating strain sensor, which is characterized in that the scaling method includes:
Obtain the wavelength of calibrated fiber grating temperature sensor and the functional relation of stretcher strain amount；
Wave between fiber Bragg grating strain sensor to be calibrated and the fiber grating temperature sensor in acquisition preset calibrations environment
Long functional relation；
By the wavelength and the functional relation of stretcher strain amount and the functional relation of the wavelength, calculates the fiber grating and answer
Become the wavelength of sensor and the functional relation of stretcher strain amount, demarcates the sensitivity coefficient of the fiber Bragg grating strain sensor.
2. scaling method according to claim 1, which is characterized in that described to obtain calibrated fiber grating temperature sensor
The wavelength of device and the functional relation of stretcher strain amount, comprising:
The fiber grating temperature sensor is stretched in the range of the fiber grating temperature sensor, is obtained in drawing process
Stretcher strain amount and with the stretcher strain amount corresponding wavelength of the fiber grating temperature sensor at different measuring points；
Based at the different measuring points stretcher strain amount and wavelength corresponding with the stretcher strain amount, calculate the optical fiber light
The wavelength of grid temperature sensor and the functional relation of stretcher strain amount.
3. scaling method according to claim 2, which is characterized in that the stretcher strain based at the different measuring points
Amount and wavelength corresponding with the stretcher strain amount calculate the wavelength and stretcher strain amount of the fiber grating temperature sensor
Functional relation, comprising:
Construct the wavelength of the fiber grating temperature sensor and the first linear functional relation expression formula of stretcher strain amount；
Obtain the stretcher strain amount in two different measuring points at each measuring point and wavelength corresponding with the stretcher strain amount；
According at each measuring point stretcher strain amount and wavelength corresponding with the stretcher strain amount, calculate the First Line
Property functional relation expression formula the first linear coefficient and first constant term coefficient, obtain the wave of the fiber grating temperature sensor
The long functional relation with stretcher strain amount.
4. scaling method according to claim 3, which is characterized in that
The first linear functional relation expression formula is x=k1L+b, wherein L is the stretching of the fiber grating temperature sensor
Deflection, x are the wavelength corresponding with the stretcher strain amount of the fiber grating temperature sensor, k1It is linear for described first
Coefficient and k1≠ 0, b are the first constant term coefficient.
5. scaling method according to claim 1, which is characterized in that described to obtain light to be calibrated in preset calibrations environment
The functional relation of wavelength between fiber grating strain transducer and the fiber grating temperature sensor, comprising:
The temperature of calibration environment where adjusting fiber Bragg grating strain sensor to be calibrated and the fiber grating temperature sensor,
It obtains different temperatures and is worth the wavelength of the corresponding fiber Bragg grating strain sensor and the wave of the fiber grating temperature sensor
It is long；
Based on different temperatures be worth the corresponding fiber Bragg grating strain sensor wavelength and the fiber grating temperature sensor
Wavelength, calculate the functional relation of wavelength between the fiber Bragg grating strain sensor and the fiber grating temperature sensor.
6. scaling method according to claim 5, which is characterized in that
The wavelength and optical fiber grating temperature biography for being worth the corresponding fiber Bragg grating strain sensor based on different temperatures
The wavelength of sensor, the function for calculating wavelength between the fiber Bragg grating strain sensor and the fiber grating temperature sensor close
System, comprising:
Construct the wavelength of the fiber Bragg grating strain sensor and the wavelength of the fiber grating temperature sensor second is linear
Functional relation expression formula；
Obtain the wavelength and the optical fiber light of the corresponding fiber Bragg grating strain sensor of each temperature value in two temperature values
The wavelength of grid temperature sensor；
It is passed according to the wavelength of the corresponding fiber Bragg grating strain sensor of each temperature value and the optical fiber grating temperature
The wavelength of sensor calculates the second linear coefficient and second constant term coefficient of the second linear functional relation expression formula, obtains
The functional relation of wavelength between the fiber Bragg grating strain sensor and the fiber grating temperature sensor.
7. scaling method according to claim 6, which is characterized in that
The second linear functional relation expression formula is y=k2X+c, wherein x is the corresponding fiber grating temperature of temperature value obtained
The wavelength of sensor is spent, y is the wavelength of the corresponding fiber Bragg grating strain sensor of temperature value of the acquisition, k2It is described second
Linear coefficient and k2≠ 0, c are the second constant term coefficient.
8. a kind of caliberating device of fiber Bragg grating strain sensor, which is characterized in that the caliberating device includes:
Deformation relationship obtains module, for obtaining the wavelength of calibrated fiber grating temperature sensor and the letter of stretcher strain amount
Number relationship；
Wavelength relationship obtains module, for obtaining fiber Bragg grating strain sensor and the light to be calibrated in preset calibrations environment
The functional relation of wavelength between fine grating temperature sensor；
Parameter calibration module, for by the wavelength and the functional relation of stretcher strain amount and the functional relation of the wavelength,
The wavelength of the fiber Bragg grating strain sensor and the functional relation of stretcher strain amount are calculated, the fiber grating strain is demarcated and passes
The sensitivity coefficient of sensor.
9. caliberating device according to claim 8, which is characterized in that the deformation relationship obtains module and includes:
Deformation quantity and wavelength value acquiring unit, for stretching the optical fiber light in the range of the fiber grating temperature sensor
Grid temperature sensor, obtain stretcher strain amount of the fiber grating temperature sensor at different measuring points described in drawing process and with
The corresponding wavelength of the stretcher strain amount；
Deformation function solving unit, for based on stretcher strain amount at the different measuring points and corresponding with the stretcher strain amount
Wavelength, calculate the wavelength of the fiber grating temperature sensor and the functional relation of stretcher strain amount.
10. caliberating device according to claim 9, which is characterized in that the deformation function solving unit includes:
Deformation function expression formula constructs subelement, for constructing the wavelength and stretcher strain amount of the fiber grating temperature sensor
The first linear functional relation expression formula；
The deformation quantity and wavelength value acquiring unit are also used to obtain the stretcher strain amount in two different measuring points at each measuring point
With wavelength corresponding with the stretcher strain amount；
The deformation function solving unit be also used to according at each measuring point stretcher strain amount and with the stretcher strain
Corresponding wavelength is measured, the first linear coefficient and first linear function for calculating the first linear functional relation expression formula close
It is the first constant term coefficient of expression formula, the function of the wavelength and stretcher strain amount that obtain the fiber grating temperature sensor closes
System.
11. caliberating device according to claim 10, which is characterized in that
The first linear functional relation expression formula is x=k1L+b, wherein L is the stretching of the fiber grating temperature sensor
Deflection, x are the wavelength corresponding with the stretcher strain amount of the fiber grating temperature sensor, k1It is linear for described first
Coefficient and k1≠ 0, b are the first constant term coefficient.
12. caliberating device according to claim 8, which is characterized in that the wavelength relationship obtains module and includes:
Wavelength value acquiring unit, for adjusting fiber Bragg grating strain sensor to be calibrated and the fiber grating temperature sensor
The temperature of environment is demarcated at place, obtains wavelength and the optical fiber that different temperatures is worth the corresponding fiber Bragg grating strain sensor
The wavelength of grating temperature sensor；
Function of wavelength solving unit, for being worth wavelength and the institute of the corresponding fiber Bragg grating strain sensor based on different temperatures
The wavelength for stating fiber grating temperature sensor calculates the fiber Bragg grating strain sensor and the fiber grating temperature sensor
Between wavelength functional relation.
13. caliberating device according to claim 12, which is characterized in that the function of wavelength solving unit includes:
Function of wavelength expression formula constructs subelement, for constructing the wavelength and the optical fiber light of the fiber Bragg grating strain sensor
Second linear functional relation expression formula of the wavelength of grid temperature sensor；
The wavelength value acquiring unit is also used to obtain the corresponding fiber grating strain of each temperature value in two temperature values
The wavelength of the wavelength of sensor and the fiber grating temperature sensor；
The function of wavelength solving unit is also used to according to the corresponding fiber Bragg grating strain sensor of each temperature value
Wavelength and the fiber grating temperature sensor wavelength, calculate the second linear functional relation expression formula second be linear
Coefficient and second constant term coefficient, obtain wavelength between the fiber Bragg grating strain sensor and the fiber grating temperature sensor
Functional relation.
14. caliberating device according to claim 13, which is characterized in that
The second linear functional relation expression formula is y=k2X+c, wherein x is the corresponding optical fiber light of temperature value obtained
The wavelength of grid temperature sensor, y are the wavelength of the corresponding fiber Bragg grating strain sensor of temperature value of the acquisition, k2It is described
Second linear coefficient and k2≠ 0, c are the second constant term coefficient.
15. a kind of calibration system of fiber Bragg grating strain sensor, which is characterized in that the calibration system includes:
Memory, for storing program；
Processor, for running the described program stored in the memory, to execute following steps:
Obtain the wavelength of calibrated fiber grating temperature sensor and the functional relation of stretcher strain amount；
Wave between fiber Bragg grating strain sensor to be calibrated and the fiber grating temperature sensor in acquisition preset calibrations environment
Long functional relation；
By the wavelength and the functional relation of stretcher strain amount and the functional relation of the wavelength, calculates the fiber grating and answer
Become the wavelength of sensor and the functional relation of stretcher strain amount, demarcates the sensitivity coefficient of the fiber Bragg grating strain sensor；
Display, for showing the sensitivity coefficient of the fiber Bragg grating strain sensor.
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| CN110926357B (en) * | 2019-12-09 | 2020-12-11 | 哈尔滨工业大学 | Method for constructing puncture needle shape change calibration model |
| CN112833809B (en) * | 2021-01-13 | 2022-06-28 | 苏州热工研究院有限公司 | Fiber grating high-temperature strain gauge and calibration method thereof |
| CN113029888B (en) * | 2021-03-31 | 2022-08-05 | 中国科学院过程工程研究所 | Calibration device and method for particle concentration in gas-solid two-phase flow |
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