CN103968863A - Array FBG sensing data mapping pseudo-color cloud map implementation system and method - Google Patents
Array FBG sensing data mapping pseudo-color cloud map implementation system and method Download PDFInfo
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Abstract
The invention discloses an array FBG sensing data mapping pseudo-color cloud map implementation system and method. The method includes the steps that firstly, fiber Bragg grating wavelength demodulation instruments, optical fiber of each engraved optical grating and each sensing unit are numbered; secondly, a central wavelength calibration array A is set in an upper computer system; thirdly, a color chart is established, and the color chart is set in the upper computer system; fourthly, the wavelength demodulation instruments are used for demodulation; fifthly, a real-time array B is acquired by subtracting an array output by the demodulation instruments from the central wavelength calibration array A; sixthly, conversion of measured physical quantity is conducted on elements in the real-time array B; seventhly, an acquired measured physical quantity array is displayed through a display device. The change of external measured quantity is reflected through the change of colors, the positions of stress sensors can be accurately positioned, and the size and the applying points of the external measured quantity can be visually displayed.
Description
Technical field
The present invention specifically discloses a kind of array FBG sensing data mapping pseudo implementation method.
Background technology
Modern information technologies are comprised of collection, transmission and the processing of information, and obtaining of information is mainly to rely on sensor and detector, so the development of sensor is had higher requirement.Optical fiber sensing technology has represented the development trend of new generation sensor.Fiber grating (FBG), as a kind of novel optical passive component, has the unrivaled good characteristic of other sensors.Adopting fiber grating as one of main advantage of sensing element, is on single-path optical fiber, to scribe a plurality of gratings, forms FBG string, forms large-scale distributed array, can realize the measurement to multiple physical quantity.Under the background of fiber-optic grating sensor development in pluralism, the short time is obtained, stores, is processed and shows that the requirement of a large amount of data is more and more higher, how Real-Time Monitoring measurand and accurately alignment sensor seem particularly important.
Fiber Bragg Grating FBG (FBG) is the photosensitivity of utilizing fiber optic materials, makes the refractive index of fiber core that permanent cycle variation occur, and forms space phase grating in fibre core, can meet to wavelength the incident light generation reflection of Bragg's condition of reflection.On simple optical fiber, scribe a plurality of gratings and form FBG string, thereby forming sensor array is to have utilized wavelength-division multiplex technique, wavelength-division multiplex is that the recovery of different wavelength is used to the mode transmitting in an optical fiber, the distribution of the centre wavelength of the grating that in use will pay special attention to scribe, guarantee that the centre wavelength of grating can not be overlapping.The wavelength of the reflection peak of Fiber Bragg Grating FBG is relevant with index modulation cycle and the fiber core refractive index of grating, when index modulation cycle of the variable effect fiber grating of ambient temperature or strain and fiber core refractive index, the reflection peak wavelength variations that will cause fiber grating, just can obtain the situation of change of extraneous measured signal according to the variation of centre wavelength.
The implication of pseudo color image is, the color of each pixel is not that the numerical value by each primary color component directly determines, but pixel value is used as to color look-up table (color look-up table, CLUT) list item entry address, removes to search a R who uses while showing image, G, B intensity level, with the R finding out, G, the colour that B intensity level produces is called pseudo-colours.Color look-up table CLUT is a set table, and list item entry address is also referred to as call number.The look-up table of 16 kinds of colors for example, No. 0 corresponding black of index ..., No. 15 corresponding whites of index.The pixel number of coloured image itself and the call number of color look-up table have a transformation relation.The colour that the numerical value demonstration obtaining is searched in use is genuine, but is not the real color of image itself, and it does not reflect the colour of former figure completely.True color refers in forming each pixel value of a width coloured image have R, G, and tri-primary color components of B, each primary color component directly determines the primary colours intensity of display device, the colour producing is like this called true color.For example use RGB5: the coloured image representing at 5: 5, R, G, B is respectively with 5, and with R, G, the value of B component size is directly determined the intensity of three primary colours, and the colour obtaining is like this that real former figure is colored.
Cloud atlas refers to the image that utilizes specific tone, range size and distribution form to characterize different physical features, sometimes for certain special requirement, also the region of some or certain several scope can be highlighted significantly, if change the black and white display of this device into color monitor, just can obtain the color cloud picture that different colours represents different range, namely several gray shade scale scopes on the image of a wave band (passage) are composed respectively to a kind of color cloud picture obtaining with different colours, i.e. pseudo.
For the duty of array of display sensor more intuitively, the display packing that current most researchers often adopt is figure explicit representation.The people such as the Mei Tao of Hefei Intelligent Machinery Inst., Chinese Academy of Scineces provide the duty that a figure shows piezoresistive transducer in " research of multifunctional array formula touch sensor " article, but are not described later in detail.The Qin Lan of University Of Chongqing, Pei Liqiang once mentioned the intensity map using in LabVIEW and simulated the pressure resistance type sensor array design sketch that is stressed in " research of Intelligent Robot touch sensing costume array calibrating ", and this has absolutely proved the superiority of graphical display packing.Aspect Fibre Optical Sensor, the Jin-Seok Heo of Korea S, Jong-Ha Chung, Jung-Ju Lee researcher utilizes the graphical language such as three-dimensional plot to show in Tactile sensorarrays using fiber Bragg grating sensors article; The at present domestic article also not showing with pseudo about array FBG sensor.
Summary of the invention
In order to solve the technical matters existing in prior art, the present invention proposes a kind of array FBG sensing data mapping pseudo implementation method.
The present invention adopts following technical proposals as follows:
A holonomic system for array FBG sensing data mapping pseudo, comprises wideband light source module, array FBG sensor senses module, demodulation module, the data processing module of interface module and host computer and display module;
Wideband light source module, the light of its transmitting arrives array FBG sensor by Optical Fiber Transmission after coupling mechanism;
Array FBG sensor senses module, for experiencing the measured of exterior object, this module is by multifiber forming array formula FBG sensor, scribes the grating of a plurality of different centre wavelengths on described optical fiber;
Transport module, arrives demodulation module for the optical signal transmission that array FBG sensor is sensed;
Demodulation module, for the centre wavelength of the fiber grating of Real-time Obtaining array FBG sensor senses module;
Interface module, for being transferred to host computer data processing module by the centre wavelength array of the fiber grating of the fiber-optic grating sensor of demodulation module detection;
Data processing module, for the treatment of the centre wavelength array of fiber grating;
Display module, the demonstration point of application, stressed size, force application object shape information by the center wavelength variation amount array of the fiber grating after processing with the formal intuition of pseudo.
Described transport module is optical cable; Described demodulation module is (FBG) demodulator, and described interface module is USB interface; Described data processing module and display module are integrated on host computer.
Array FBG sensing data mapping pseudo implementation method, comprises the following steps:
The optical fiber of grating, the numbering that each sensing unit carries out Three Estate are scribed in step 1 pair optic fiber grating wavelength (FBG) demodulator, each road;
Step 2 arranges a centre wavelength and demarcates array A in master system, numbers the sensing unit numbering of corresponding array FBG sensor in array A;
Step 3 is set up colour chart, and a colour chart is set in master system, makes the value of measurand and the pixel value of colour chart produce corresponding relation, and wherein different colors represents different measurand values;
Step 4 is carried out demodulation with wavelength demodulation device, and each wavelength demodulation device can be exported one group of array;
Step 5 is subtracted each other the array of (FBG) demodulator output and centre wavelength demarcation array A, obtains real-time array B;
Step 6 is carried out the conversion of measurand by element in real-time array B, is about to fiber bragg grating center wavelength changing value and is converted into corresponding measurand, obtains measurand array C after conversion;
Step 7 utilizes the measurand array C that display device obtains step 6 to show.
The detailed process of described step 1 is as follows:
The first order: optic fiber grating wavelength (FBG) demodulator is numbered;
The second level: each road is scribed to the optical fiber numbering of grating, adopt wavelength multiplexing technology to scribe a plurality of gratings on each root optical fiber, every light just forms a road signal like this, needs Dui Mei road signal to be numbered;
The third level: each sensing unit in Fiber Bragg Grating Sensor Array is numbered.Sensing unit in pair array formula FBG sensor is numbered the grating being equivalent to scribing on each road optical fiber in sensor and is numbered.
The described grating of scribing, according to from left to right, from the top down, centre wavelength is that numbering is arranged in variation from small to large;
Described step 2 concrete grammar is as follows: array line number represents the horizontal sensing unit number in sensor array, and array columns represents the longitudinal sensing unit number in sensor array, the center for standard wavelength that array element is fiber grating; Fiber grating original wavelength while not affected by extraneous tested factor.
The detailed process of described step 3 is as follows:
A color look-up table is set in master system, is pixel value to be used as to the list item entry address of color look-up table CLUT in pseudo, removes to search a R who uses while showing image, G, B intensity level, with the R finding out, G, the colour that B intensity level produces is called pseudo-colours; Wherein color look-up table CLUT is a set table, and list item entry address is as call number; The pixel number of coloured image itself and the call number of color look-up table have a transformation relation; Measurand is converted into the call number of color look-up table according to variation relation, makes the value of measurand and pixel value produce corresponding relation, different colors represents different measurand values.
Described step 4,5 in the processing procedure of single wavelength demodulation device as follows:
The data that static sensor array collects are fixing two-dimensional arrays, and the line number of array and columns are exactly line number and the columns of sensor array, and the distance between row and row, column and row is fixing and known; Selected good coordinate system, each sensor unit is corresponding a fixed position point just, in the respective point of coordinate plane, according to the mapping of binaryzation result, just can obtain whole demonstration;
The data that dynamic data sensor collects are indefinite two-dimensional matrixs, each row is real time datas of a fiber grating, receive after real time data, the data of the first row first row in the data of first row and above-mentioned set centre wavelength demarcation array A are subtracted each other, obtain the center wavelength shift amount Δ λ of first optical fiber grating sensing unit, and put into the first row first row of real-time array B; And then in the data of taking-up secondary series and above-mentioned set centre wavelength demarcation array A, the data of the first row secondary series are subtracted each other, and obtain the center wavelength shift amount Δ λ of second optical fiber grating sensing unit, and put into the first row secondary series of real-time array B; Process successively, columns in real-time array B with demarcate columns in array A and equate after, again line number label is added to one, enter the second row of real-time array B, process in real time in the manner described above always, finally obtain the array B of a real-time change, the line number of array is the horizontal sensing unit number of sensor array, array columns represents the longitudinal sensing unit number in sensor array, and the element in array is the center wavelength variation value of the optical fiber grating sensing unit of real-time change.
In described step 6, element in real-time array B is carried out to the conversion of physical quantity according to calibrated and calculated formula, be about to fiber bragg grating center wavelength changing value and be converted into corresponding measurand, the measurand array brief note after changing is C.In center wavelength shift amount array, the following formula of data utilization carries out the conversion of physical quantity:
Common FBG sensor is realized measured detection by measuring the drift of bragg wavelength, grating bragg wavelengths
bcondition can be expressed from the next:
λ
B＝2nΛ
In formula, λ
bcentre wavelength for fiber grating; Λ-grating cycle; N-refractive index.
When wideband light source incides in optical fiber by light, it is λ that grating will reflect its medium wavelength
bcomponent.λ
bdrift with stress and temperature is:
Wherein, Δ λ
b-fiber bragg grating center wavelength variable quantity
ε-applied stress;
P
i,jthe photoelastic tensor coefficient of-optical fiber;
V-Poisson ratio;
The thermal expansivity of α-fiber optic materials (as quartz);
Δ T-temperature variation.
In above formula: under temperature and the certain condition of stress, can derive FBG stress and temperature-responsive condition suc as formula under:
K
t-fiber grating relative wavelength drift temperature sensitive coefficient;
K
ε-fiber grating relative wavelength drift gage factor.
General, the parameter of fused quartz: P
11=0.121, P
12=0.27, v=0.17, n=0.456, can obtain
value be 0.22; Fiber grating relative wavelength drift gage factor K
ε=0.78.When carrying out temperature compensation, can obtain fiber bragg grating center wavelength side-play amount and strain stress relation formula: Δ λ
b=0.78 λ
b ε; According to formula, can obtain measurand;
The detailed process of described step 7 is as follows:
(7-1) in host computer, realize pcolor array mapping, described pcolor is comprised of the little grid intersecting in length and breadth, and each little grid represents a sensing unit in optical fiber FBG sensor array, and each sensor unit is corresponding a fixed position point just;
(7-2) data in the measurand array C obtaining according to step 6 are searched colour chart, data in measurand array C and the call number of color look-up table have arranged in initialization, and the respective index number corresponding pseudo-colours value retrieving in colour chart represents that extraneous measurand is applied to the value size of corresponding sensing unit;
(7-3) find after pseudo-colours value, obtain the position of sensor according to position in array, the address of the little grid of representative sensor shows pseudo-colours on the corresponding little grid of pcolor (representing corresponding fiber grating touch sensor) position;
(7-4) between definite color of finding, use " interpolation " algorithm, the gap between sensor and sensor (position of no-raster) inserted to gradual change color, make the external world of reflection measured vivider;
Above-mentioned description is a kind of implementation algorithm of sensing data mapping pseudo, in practice, can adopt any instrument that can realize (as matlab or LabVIEW etc.) to realize, also can adopt various ways (as two-dimentional pseudocolour picture or three-dimensional pseudocolour picture etc.) to realize.
The invention has the beneficial effects as follows:
The present invention, as a kind of array FBG sensing data mapping pseudo implementation method, has realized the demonstration localization method of the pseudo of sensor array at host computer.The present invention uses the extraneous measured variation of variation reflection of color, can locate accurately the position of force sensor, demonstration intuitively extraneous measured size and application point, need not adopt mechanical mode, difficulty of test and complicacy have been reduced, improved work efficiency, the present invention also has simplicity of design, fast, accurately, the features such as high-visible property, can meet the needs of accurate demonstration and On-line Control.
Accompanying drawing explanation
Fig. 1 realizes the holonomic system of array FBG sensing data mapping pseudo;
Fig. 2 SYSTEM SUMMARY.
Embodiment
In Fig. 1, show main workflow: adopt wavelength-division multiplex technique, on an optical fiber, scribe the grating of a plurality of different centre wavelengths, by many such optical fiber forming array formula FBG sensors.The application of force of being experienced exterior object by array FBG sensor, arrives optic fiber grating wavelength (FBG) demodulator by the light signal sensing by optical cable transmission, carries out obtaining centre wavelength array after peak-seeking algorithm process; By USB interface, communicate by letter with host computer, then carry out data processing and demonstration.
The present invention adopts the visual pseudo way of output to reflect that array FBG sensor is subject to the extraneous measured duty applying after signal.
The method of specific implementation is as follows:
One, initial configuration:
1, numbering
In application array FBG sensor occasion, often the fiber grating quantity of required use is huge.For avoiding wave band overlapping, the quantity of scribing grating on an optical fiber is limited, thereby the quantity of needed optic fiber grating wavelength (FBG) demodulator, coupling mechanism, optical fiber also increases along with the increase of Fiber Bragg Grating Sensor Array, allly first tackle the numbering that optic fiber grating wavelength (FBG) demodulator, optical fiber, fiber grating carry out Three Estate, Three Estate is respectively the first order, the second level, the third level from big to small.
The first order: to optic fiber grating wavelength (FBG) demodulator numbering, can decay because light is propagated in array FBG sensor, so a road optical fiber can only be scribed limited fiber grating, when area to be measured is larger, just have a lot of roads signal.And (FBG) demodulator can only the some roads of demodulation signal, if want all signals of demodulation, need a plurality of (FBG) demodulators, these (FBG) demodulators are numbered to (as I, II, III, IV).
The second level: each road is scribed to the optical fiber numbering of grating, adopt wavelength multiplexing technology to scribe a plurality of gratings on each root optical fiber, every light just forms a road signal like this, needs Dui Mei road signal to be numbered (as 1,2,3).
The third level: 1. each sensing unit in Fiber Bragg Grating Sensor Array is numbered, 2., 3..Sensing unit in pair array formula FBG sensor is numbered the grating being equivalent to scribing on each road optical fiber in sensor and is numbered, when scribing grating, according to from left to right, from the top down, centre wavelength is variation arrangement numbering from small to large, due to centre wavelength peak excursion for respectively to from left to right 1nm, so the raster center wavelength of scribing needs at least 3nm of interval, with avoid overlapping and array in the disorderly phenomenon of data order;
2. transducer calibration:
In master system, arrange one and demarcate wavelength array (below represent with A), in array, number the sensing unit numbering of corresponding array FBG sensor, array line number represents the horizontal sensing unit number in sensor array, array columns represents the longitudinal sensing unit number in sensor array, the center for standard wavelength that array element is fiber grating (the fiber grating original wavelength while not affected by extraneous tested factor);
3. set up colour chart:
A color look-up table is set in master system, is pixel value to be used as to the list item entry address of color look-up table (CLUT) in pseudo, removes to search a R who uses while showing image, G, B intensity level, with the R finding out, G, the colour that B intensity level produces is called pseudo-colours.Color look-up table CLUT is a set table, and list item entry address is also referred to as call number.The look-up table of 16 kinds of colors for example, No. 0 corresponding black of index ..., No. 15 corresponding whites of index.The pixel number of coloured image itself and the call number of color look-up table have a transformation relation.Measurand (as strain) is converted into the call number of color look-up table according to variation relation here, makes the value of measurand and pixel value produce corresponding relation, different colors represents different measurand values.
Two, data processing
Array FBG sensor in sensing module is experienced the measured of exterior object, then by interface module, uploads to data processing module after the centre wavelength of the fiber grating in demodulation module Real-time Obtaining array FBG sensor senses module.To the array FBG sensor of wavelength multiplexing technology, adopt wavelength demodulation device to carry out demodulation, after the peak-seeking algorithm of wavelength demodulation device, output center wavelength array.Each wavelength demodulation device can be exported one group of data, and the data of all wavelengths (FBG) demodulator all use the same method and process, so first the data of single wavelength demodulation device are described.For single wavelength demodulation device:
The data that static sensor array collects are fixing two-dimensional arrays, and the line number of array and columns are exactly line number and the columns of sensor array, and the distance between row and row, column and row is fixing and known.Selected good coordinate system, each sensor unit is corresponding a fixed position point just, in the respective point of coordinate plane, according to the result mapping of binaryzation, just can obtain whole demonstration.
The data that dynamic data sensor collects are indefinite two-dimensional matrixs, each row is real time datas of a fiber grating, receive after real time data, the data of the data of first row and the interior the first row first row of above-mentioned set centre wavelength demarcation array (A) are subtracted each other, obtain the center wavelength shift amount △ λ of first optical fiber grating sensing unit, and put into the first row first row of real-time array (B); And then the data of the data of taking-up secondary series and the interior the first row secondary series of above-mentioned set centre wavelength demarcation array (A) are subtracted each other, obtain the center wavelength shift amount △ λ of second optical fiber grating sensing unit, and put into the first row secondary series of real-time array (B); Process successively, columns in real-time array (B) with demarcate columns in array (A) and equate after, again line number label is added to one, enter the second row of real-time array (B), process in real time in the manner described above always, finally obtain the array (B) of a real-time change, the line number of array is the horizontal sensing unit number of sensor array, array columns represents the longitudinal sensing unit number in sensor array, and the element in array is the center wavelength variation value of the optical fiber grating sensing unit of real-time change.
Element in real-time array (B) is carried out to the conversion of physical quantity according to calibrated and calculated formula, fiber bragg grating center wavelength changing value is converted into corresponding measurand, the measurand array brief note after changing is C.
Formula is as follows:
Common FBG sensor is realized measured detection by measuring the drift of bragg wavelength, grating bragg wavelengths
bcondition can be expressed from the next:
λ
B＝2nΛ
In formula, λ
bcentre wavelength for fiber grating; Λ-grating cycle; N-refractive index.
When wideband light source incides in optical fiber by light, it is λ that grating will reflect its medium wavelength
bcomponent.λ
bdrift with stress and temperature is:
Wherein, Δ λ
b-fiber bragg grating center wavelength variable quantity
ε-applied stress;
P
i,jthe photoelastic tensor coefficient of-optical fiber;
V-Poisson ratio;
The thermal expansivity of α-fiber optic materials (as quartz);
Δ T-temperature variation.
In above formula: under temperature and the certain condition of stress, can derive FBG stress and temperature-responsive condition suc as formula under:
K
t-fiber grating relative wavelength drift temperature sensitive coefficient;
K
ε-fiber grating relative wavelength drift gage factor.
General, the parameter of fused quartz: P
11=0.121, P
12=0.27, v=0.17, n=0.456, can obtain
value be 0.22; Fiber grating relative wavelength drift gage factor K
ε=0.78.When carrying out temperature compensation, can obtain fiber bragg grating center wavelength side-play amount and strain stress relation formula: Δ λ
b=0.78 λ
b ε; According to formula, can obtain measurand;
Three, show
Host computer is realized pcolor array mapping, and this pcolor is comprised of the little grid intersecting in length and breadth, and each little grid represents a sensing unit in optical fiber FBG sensor array, and each sensor unit is corresponding a fixed position point just; According to the data in the measurand array (C) obtaining, search colour chart, data in measurand array (C) and the call number of color look-up table have arranged in initialization, and the respective index number corresponding pseudo-colours value retrieving in colour chart represents that extraneous measurand is applied to the value size of corresponding sensing unit;
Find after pseudo-colours value, obtain the position of sensor according to position in array, the address of the little grid of representative sensor shows pseudo-colours on the corresponding little grid of pcolor (representing corresponding fiber grating touch sensor) position;
Between definite color of finding, use " interpolation " algorithm, the gap between sensor and sensor (position of no-raster) inserted to gradual change color, make the external world of reflection measured vivider;
Above-mentioned description is a kind of implementation algorithm of sensing data mapping pseudo, in practice, can adopt any instrument that can realize (as matlab or LabVIEW etc.) to realize, also can adopt various ways (as two-dimentional pseudocolour picture or three-dimensional pseudocolour picture etc.) to realize.
Claims (9)
1. a system for array FBG sensing data mapping pseudo, is characterized in that, comprises wideband light source module, array FBG sensor senses module, demodulation module, the data processing module of interface module and host computer and display module;
Wideband light source module, the light light of its transmitting arrives array FBG sensor by Optical Fiber Transmission after coupling mechanism;
Array FBG sensor senses module, for experiencing the measured of exterior object, this module is by multifiber forming array formula FBG sensor, scribes the grating of a plurality of different centre wavelengths on described optical fiber;
Transport module, arrives demodulation module for the optical signal transmission that array FBG sensor is sensed;
Demodulation module, for the centre wavelength of the fiber grating of Real-time Obtaining array FBG sensor senses module;
Interface module, for being transferred to host computer data processing module by the centre wavelength array of the fiber grating of the fiber-optic grating sensor of demodulation module detection;
Data processing module, for the treatment of the centre wavelength array of fiber grating;
Display module, demonstrates the point of application, stressed size, force application object shape information by the center wavelength variation amount array of the fiber grating after processing with the formal intuition of pseudo.
2. an array FBG sensing data mapping pseudo implementation method, is characterized in that, comprises the following steps:
The optical fiber of grating, the numbering that each sensing unit carries out Three Estate are scribed in step 1 pair optic fiber grating wavelength (FBG) demodulator, each road;
Step 2 arranges a centre wavelength and demarcates array A in master system, numbers the sensing unit numbering of corresponding array FBG sensor in array A;
Step 3 is set up colour chart, and a colour chart is set in master system, makes the value of measurand and the pixel value of colour chart produce corresponding relation, and wherein different colors represents different measurand values;
Step 4 is carried out demodulation with wavelength demodulation device, and each wavelength demodulation device can be exported one group of array;
Step 5 is subtracted each other the array of (FBG) demodulator output and centre wavelength demarcation array A, obtains real-time array B;
Step 6 is carried out the conversion of measurand by element in real-time array B, is about to fiber bragg grating center wavelength changing value and is converted into corresponding measurand, obtains measurand array C after conversion;
Step 7 utilizes the measurand array that display device obtains step 6 to show.
3. array FBG sensing data mapping pseudo implementation method as claimed in claim 2, is characterized in that, the detailed process of described step 1 is as follows:
The first order: optic fiber grating wavelength (FBG) demodulator is numbered;
The second level: each road is scribed to the optical fiber numbering of grating, adopt wavelength multiplexing technology to scribe a plurality of gratings on each root optical fiber, every light just forms a road signal like this, needs Dui Mei road signal to be numbered;
The third level: each sensing unit in Fiber Bragg Grating Sensor Array is numbered; Sensing unit in pair array formula FBG sensor is numbered the grating being equivalent to scribing on each road optical fiber in sensor and is numbered.
4. array FBG sensing data as claimed in claim 3 mapping pseudo implementation method, is characterized in that, the described grating of scribing, and according to from left to right, from the top down, centre wavelength be that variation is from small to large arranged and numbered.
5. array FBG sensing data as claimed in claim 3 shines upon pseudo implementation method, it is characterized in that, described step 2 concrete grammar is as follows: array line number represents the horizontal sensing unit number in sensor array, array columns represents the longitudinal sensing unit number in sensor array, the center for standard wavelength that array element is fiber grating; Fiber grating original wavelength while not affected by extraneous tested factor.
6. array FBG sensing data mapping pseudo implementation method as claimed in claim 3, is characterized in that, the detailed process of described step 3 is as follows:
A color look-up table is set in master system, is pixel value to be used as to the list item entry address of color look-up table CLUT in pseudo, removes to search a R who uses while showing image, G, B intensity level, with the R finding out, G, the colour that B intensity level produces is called pseudo-colours; Wherein color look-up table CLUT is a set table, and list item entry address is as call number; The pixel number of coloured image itself and the call number of color look-up table have a transformation relation; Measurand is converted into the call number of color look-up table according to variation relation, makes the value of measurand and pixel value produce corresponding relation, different colors represents different measurand values.
7. array FBG sensing data as claimed in claim 3 mapping pseudo implementation method, is characterized in that, described step 4 or 5 in the processing procedure of single wavelength demodulation device as follows:
The data that static sensor array collects are fixing two-dimensional arrays, and the line number of array and columns are exactly line number and the columns of sensor array, and the distance between row and row, column and row is fixing and known; Selected good coordinate system, each sensor unit is corresponding a fixed position point just, in the respective point of coordinate plane, according to the result mapping of binaryzation, obtains whole demonstration;
The data that dynamic data sensor collects are indefinite two-dimensional matrixs, each row is real time datas of a fiber grating, receive after real time data, the data of the first row first row in the data of first row and above-mentioned set centre wavelength demarcation array A are subtracted each other, obtain the center wavelength shift amount △ λ of first optical fiber grating sensing unit, and put into the first row first row of real-time array B; And then in the data of taking-up secondary series and above-mentioned set centre wavelength demarcation array A, the data of the first row secondary series are subtracted each other, and obtain the center wavelength shift amount △ λ of second optical fiber grating sensing unit, and put into the first row secondary series of real-time array B; Process successively, columns in real-time array B with demarcate columns in array A and equate after, again line number label is added to one, enter the second row of real-time array B, process in real time in the manner described above always, finally obtain the array B of a real-time change, the line number of array is the horizontal sensing unit number of sensor array, array columns represents the longitudinal sensing unit number in sensor array, and the element in array is the center wavelength variation value of the optical fiber grating sensing unit of real-time change.
8. array FBG sensing data mapping pseudo implementation method as claimed in claim 3, is characterized in that, the detailed process of described step 6 is as follows:
Common FBG sensor is realized measured detection by measuring the drift of bragg wavelength, grating bragg wavelengths
bcondition can be expressed from the next:
λ
B＝2nΛ
In formula, λ
bcentre wavelength for fiber grating; Λ-grating cycle; N-refractive index;
When wideband light source incides in optical fiber by light, it is λ that grating will reflect its medium wavelength
bcomponent; λ
bdrift with stress and temperature is:
Wherein, Δ λ
b-fiber bragg grating center wavelength variable quantity
ε-applied stress;
P
i,jthe photoelastic tensor coefficient of-optical fiber;
V-Poisson ratio;
The thermal expansivity of α-fiber optic materials (as quartz);
Δ T-temperature variation;
In above formula: under temperature and the certain condition of stress, can derive FBG stress and temperature-responsive condition suc as formula under:
K
t-fiber grating relative wavelength drift temperature sensitive coefficient;
K
ε-fiber grating relative wavelength drift gage factor;
The parameter of fused quartz: P
11=0.121, P
12=0.27, v=0.17, n=0.456, can obtain
value be 0.22; Fiber grating relative wavelength drift gage factor K
ε=0.78; When carrying out temperature compensation, can obtain fiber bragg grating center wavelength side-play amount and strain stress relation formula: Δ λ
b=0.78 λ
b ε; According to formula, obtain measurand.
9. array FBG sensing data mapping pseudo implementation method as claimed in claim 3, is characterized in that, the detailed process of described step 7 is as follows:
(7-1) on host computer, realize pcolor array mapping, this pcolor is comprised of the little grid intersecting in length and breadth, and each little grid represents a sensing unit in optical fiber FBG sensor array, and each sensor unit is corresponding a fixed position point just;
(7-2) data in the measurand array C obtaining according to step 6 are searched colour chart, data in measurand array C and the call number of color look-up table have arranged in initialization, and the respective index number corresponding pseudo-colours value retrieving in colour chart represents that extraneous measurand is applied to the value size of corresponding sensing unit;
(7-3) find after pseudo-colours value, obtain the position of sensor according to position in array, the address of the grid of representative sensor shows pseudo-colours on the corresponding grid position of pcolor;
(7-4) between definite color of finding, use " interpolation " algorithm, gradual change color is inserted in the gap between sensor and sensor, make the external world of reflection measured vivider.
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