CN108387314A - The fiber grating demodulation method of spectral resolution is improved using fine motion detector array - Google Patents
The fiber grating demodulation method of spectral resolution is improved using fine motion detector array Download PDFInfo
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- 230000003595 spectral effect Effects 0.000 title claims abstract description 26
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- 239000000835 fiber Substances 0.000 title claims abstract description 19
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- 238000003384 imaging method Methods 0.000 claims abstract description 32
- 239000013307 optical fiber Substances 0.000 claims abstract description 30
- 230000001105 regulatory effect Effects 0.000 claims abstract description 21
- 238000005086 pumping Methods 0.000 claims abstract description 18
- 238000002347 injection Methods 0.000 claims abstract description 9
- 239000007924 injection Substances 0.000 claims abstract description 9
- 238000000985 reflectance spectrum Methods 0.000 claims abstract description 5
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2823—Imaging spectrometer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0256—Compact construction
- G01J3/0259—Monolithic
Abstract
The present invention provides a kind of fiber grating demodulation methods improving line scan image sensor spectral resolution using fine motion detector array,Including taking demodulating system,The demodulating system includes pumping source,Wavelength division multiplexer,Bragg grating,Diaphragm,Slit,Collimating mirror,Spectro-grating,Imaging lens and linear array detector,Piezoelectric-actuator and voltage control system,The wherein described pumping source,Wavelength division multiplexer and bragg grating are sequentially connected,The wavelength division multiplexer connects diaphragm simultaneously,Enter bragg grating after the coupling that the light that the pumping source is sent out passes through wavelength division multiplexer,The reflectance spectrum of the bragg grating enters optical fiber grating regulating system as injection light,After injection light is by slit,Pass sequentially through collimating mirror,Spectro-grating,The reflection of imaging lens,Finally converge on linear array detector,The wherein described linear array detector moves left and right slight distance along its long axis direction.
Description
It is on 03 31st, 2016 that the application, which is the applying date, and application No. is CN201610200413.3, entitled to adopt
The divisional application of the optical fiber grating regulating system of spectral resolution is improved with fine motion detector array.
Technical field
It is the present invention relates to sensory field of optic fibre, more particularly to a kind of that spectral resolution is improved using fine motion detector array
Fiber grating demodulation method.
Background technology
Fiber grating is a kind of novel passive sensing element, has high sensitivity, anti-electromagnetic interference capability is strong, corrosion-resistant etc.
Plurality of advantages has had been achieved for the development of Fast Persistence since for sensing, in necks such as aerospace, building structure, oil
It is had broad application prospects in terms of the safety monitoring in domain.Optical fiber grating regulating system is the key component of entire sensor-based system,
Realize that high-precision, high-resolution, dynamic and static parameter combine, multipoint multiplexing detection and low cost are fiber grating demodulation technologies
The trend of development.There are many ways to optical fibre interrogation, tuning F-P filter methods are only used for measuring static strain, tunable laser
The cost of device method is very high, and non-equilibrium M-Z interferometries are easily affected by environment, are unfavorable for engineer application.As optics is visited in recent years
Survey the fast development of device so that Miniature optical fiber spectrometer is fast-developing, the optical fibre interrogation technology based on light spectrum image-forming method also with
Grow up.Fiber Bragg grating (FBG) demodulator based on light spectrum image-forming method is small, and integration degree is high, can be used for measuring it is static and
Dynamic strain has outstanding advantages in numerous demodulation methods, is an important directions of demodulating system research, wherein demodulation
The Performance of Optical System of instrument directly affects the resolution ratio of system, is a key of (FBG) demodulator.
The optical system structure type of grating spectrograph is more, and what application was commonplace at present is Czerny-Turner light
Line structure, i.e., using two sides concave mirror as collimating mirror and imaging lens, using plane reflection grating as dispersion element.This
On the one hand it is because plane grating design difficulty is low, cost of reproduction is cheap, and diffraction efficiency is high；On the other hand it is due to Czerny-
Turner structures are adjusted and the structural parameters of arrangement are more, can be to avoid secondary or multiple diffraction, convenient for using photovoltaic array
Detector receives spectrum.Common Small-sized C zerny-Turner spectrometers are broadly divided into 2 kinds of structures of chiasma type and M types.M types are
The classical architecture of Czerny-Turner spectrometers, representative products are the Avaspec series smalls that Dutch Avantes companies develop
Fiber spectrometer；Chiasma type is then the more compact structure from its differentiation, and space availability ratio is high.However, due to linear array figure
As sensor pixel Limited Number, spectral space resolution ratio is restricted.
Therefore, it can accurately be demodulated in the limited realization high-resolution gration wavelength of line array sensor pixel, be
This field technical problem urgently to be resolved hurrily.
Invention content
It is spectrally resolved using fine motion detector array raising line scan image sensor that the purpose of the present invention is to provide a kind of
The fiber grating demodulation method of rate, the method includes building spline system, the demodulating system includes pumping source, wavelength-division multiplex
Device, bragg grating, diaphragm, slit, collimating mirror, spectro-grating, imaging lens and linear array detector, piezoelectric-actuator and
Voltage control system, wherein the pumping source, wavelength division multiplexer and bragg grating are sequentially connected, the wavelength division multiplexer
Diaphragm is connected simultaneously, bragg grating is entered after the coupling that the light that the pumping source is sent out passes through wavelength division multiplexer, it is described
The reflectance spectrum of bragg grating enters optical fiber grating regulating system as injection light, after injection light is by slit, leads to successively
The reflection for crossing collimating mirror, spectro-grating, imaging lens, finally converges on linear array detector, wherein the linear array detector is along it
Long axis direction moves left and right slight distance.
Preferably, the linear array detector moving range is between 0-1 centimetres.
Preferably, the linear array detector is adjusted at a high speed by piezoelectric-actuator.
Preferably, the method for the mobile slight distance is as follows：
A) piezoelectric-actuator is adjusted to least significant end, this voltage is initial adjustment voltage；
B) record least significant end spectroscopic data is initial spectrum；
C) half step distance adjusts piezoelectric-actuator, calculates current light spectrum and initial spectrum, and the piezoelectric-actuator is position
Servo is set, it is dynamic that linear array detector progress micro-shifting is controlled by input position instruction, the spatial position of incident light is adjusted,
It is final to determine light spectrum image-forming position；
D) for the first time the degree of correlation peak value when adjusting voltage be recorded as eventually adjust voltage；
E) several grades being divided between tune voltage by initial adjustment voltage and eventually, demodulation every time measures each grade, with
Obtain higher spatial resolution.
Preferably, the concrete processing procedure of the sub-step b) is as follows：
When there are 256 pixels, then 256 subsection integral values can be obtained：{ I0, I1, I2 ... ... ..I255 }, works as picture
When element is scanned along a direction fine motion, another ordered series of numbers is obtained：I0 ', I1 ', and I2 ' ... ... ..I255 ' }, before being gone before this ordered series of numbers
Person obtains：{ I0 '-I0, I1 '-I1, I2 '-I2 ... ... I255 '-I255, }, i.e. { G1-G0, G2-G1, G3-G2 ... ... }；Its
Middle G0 indicates that the light intensity true value of the 0th position, G1 indicate the light intensity value of 1 position；It sums to this ordered series of numbers, obtains { G1-G0, G2-
G0, G3-G0 ... ... G255-G0 }, what is obtained in this way is the new value after finely tuning for the first time, followed by new after second of fine tuning
Value, if having finely tuned n times, just obtains the interpolation of n times.
It should be appreciated that aforementioned description substantially and follow-up description in detail are exemplary illustration and explanation, it should not
As the limitation to the claimed content of the present invention.
Description of the drawings
With reference to the attached drawing of accompanying, the more purposes of the present invention, function and advantage are by the as follows of embodiment through the invention
Description is illustrated, wherein：
Fig. 1 is the structure according to the optical fiber grating regulating system of the raising line scan image sensor spectral resolution of the present invention
Schematic diagram；
Fig. 2 diagrammatically illustrates the fiber grating demodulation for being translated using slit and improving line scan image sensor spectral resolution
The structural schematic diagram of system；
Fig. 3 schematically shows the optical fiber grating regulating system finely tuned using collimating mirror and improve detector array spectral resolution
Structural schematic diagram；
Fig. 4 schematically shows the optical fiber grating regulating system that detector array spectral resolution is improved using fine motion grating
Structural schematic diagram；
Fig. 5 schematically shows the optical fiber grating regulating system finely tuned using imaging lens and improve detector array spectral resolution
Structural schematic diagram；
Fig. 6 schematically shows the fiber grating demodulation finely tuned using linear array detector and improve detector array spectral resolution
The structural schematic diagram of system；
Fig. 7 schematically shows the structural schematic diagram for the optical fiber grating regulating system for improving detector array spectral resolution；
Fig. 8 schematically shows the optical fiber light according to the present invention for being scanned using linear array detector fine motion and improving spectral resolution
Grid demodulating system improves the flow of the feedback of the optical fiber grating regulating system of line scan image sensor spectral resolution
Figure；
Fig. 9 (a) shows a light intensity in space in one-dimensional Gaussian curve distribution map；
Result figure after the multiple measurement results interpolation that Fig. 9 (b) is shown when not adjusting slit after scanning；
The result figure after multiple measurement results interpolation when Fig. 9 (c) shows adjusting slit after scanning.
Specific implementation mode
Fig. 1 is the structure according to the optical fiber grating regulating system of the raising line scan image sensor spectral resolution of the present invention
Schematic diagram；A kind of optical fiber light improving line scan image sensor spectral resolution using linear array detector fine motion provided by the invention
Grid demodulating system 100 is as shown in Figure 1, the optical fiber grating regulating system 100 includes pumping source (LD) 101, wavelength division multiplexer
(WDM) 102, bragg grating (FBG) 103, diaphragm 104, slit 105, spectro-grating 106, collimating mirror 107, imaging lens
108 and linear array detector (CCD) 109.Pumping source 101, wavelength division multiplexer 102 and bragg grating 103 are sequentially connected,
Wavelength division multiplexer 102 connects diaphragm 104 simultaneously.Enter cloth after the coupling that the light that pumping source 101 is sent out passes through wavelength division multiplexer 102
The reflectance spectrum of glug fiber grating 103, bragg grating 103 enters optical fiber grating regulating system as injection light.Injection
After light is by slit 105, the reflection of collimating mirror 106, spectro-grating 107, imaging lens 108 is passed sequentially through, linear array is finally converged to
On detector (CCD) 109.
First, by pumping source 101, wavelength division multiplexer 102, the welding in the manner shown in figure 1 of bragg grating 103,
Middle bragg grating 103 should have higher reflectivity and relatively narrow line width.Wave according to the embodiment of the present invention
Division multiplexer (WDM) 102, bragg grating (FBG) 103 parameter selection be required to same pumping wavelength, laser emitting wave
Long parameter matching, specific parameter are as shown in table 1.
The reflectance spectrum light source parameters of 1 demodulating system according to the present invention of table
If selection core diameter is 10/125 μm of Er-doped fiber as gain media, pumping source LD tail optical fibers, wavelength-division in embodiment
Multiplexer WDM need to choose same model core diameter.Pumping source LD output wavelength 976nm, wavelength division multiplexer WDM operation wavelength 976/
1550nm, bragg grating FBG selection ranges are 1530nm-1560nm, can obtain laser output in the range.It is real
If in testing select core diameter be 10/125 μm of Yb dosed optical fiber as gain media, pumping source LD tail optical fibers, wavelength division multiplexer WDM need to select
Take same model core diameter.Pumping source LD is 915nm single-mode outputs, wavelength division multiplexer WDM operation wavelength 915/1064nm, Bradley
Lattice fiber grating FBG chooses near 1064nm, can obtain laser output in the range.
The reflected light of bragg grating 103 is irradiated to collimating mirror 106 by diaphragm 104 as incident light a and maintains light
The collimation of beam, then collimated light, which is irradiated on spectro-grating 107, carries out diffraction light splitting, passes through imaging lens 108 later, converges in
Linear array detector 109.
Spectro-grating 107 can be indicated by formula (1)
N λ=d (sin α ± sin β) (1)
Wherein n is the order of spectrum, n=0, ± 1, ± 2 ...；α is incidence angle；β is angle of reflection；θ is blaze angle；D is that grating is normal
Number.
N=0 is zero order spectrum, at this point, β is unrelated with λ, i.e., is acted on without light splitting；N=± 1, ± 2 correspond to first-order spectrum and
Second order spectrum, wherein first-order spectrum energy is strong, can be used for realizing light splitting.Grating resolution is unrelated with wavelength, the spectrum after separation
Belong to and arrange spectrum, the theoretical resolution of grating is the product of grating line number and spectrum level, there can be formula (2) expression
R=nN (2)
It is 50mm for width, groove number is the grating of 1200/mm, and the resolution ratio of first-order spectrum is 6 × 104.
Using 103 reflected light of bragg grating as injection light source, the spectrum width of incident light is reduced in this way, in grating point
Resolution can obtain under conditions of determining and more be spaced finer interference fringe.At this time to slit, diaphragm, spectro-grating, standard
Straight mirror, imaging lens and linear array detector are adjusted, and by input position instruction, to control, slit micro-shifting is dynamic or control is divided light
Micro- rotation of grid, collimating mirror, imaging lens and linear array detector, is adjusted the spatial position of incident light, then is incident on imaging
The light path of mirror changes, and the striped converged on linear array detector also occurs to change accordingly, final to determine light spectrum image-forming position
It sets.
Specifically, it is described in detail by following embodiment.
Embodiment 1
Fig. 2 diagrammatically illustrates the fiber grating demodulation for being translated using slit and improving line scan image sensor spectral resolution
The structural schematic diagram of system.As shown in Fig. 2, slit 105 is adjusted, slit is made to be moved along the directions shown by arrow b, slit moves
Dynamic step-length is 0.1 micron, and adjustable range is between 0-1 centimetres.Slit 105 is adjusted at a high speed by piezoelectric-actuator.Piezoelectricity
Executive component is controlled by voltage control system, makes light spectrum image-forming in the position of line scan image sensor at minimum pixel interval
It is moved in range.In this way, being incident on the light path of imaging lens 108 will change, converge on linear array detector 109
Striped also occur accordingly change.By the width of adjusting optical fiber entrance slit, the minute movement of striped can be realized, to
Have the function that improve measuring accuracy.
Embodiment 2
Fig. 3 schematically shows the optical fiber grating regulating system finely tuned using collimating mirror and improve detector array spectral resolution
Structural schematic diagram.As shown in figure 3, collimation mirror 106 is adjusted, collimating mirror is set to be rotated along the directions shown by arrow c, rotation angle
Degree is counterclockwise or rotates clockwise 10 ° -30 °.Collimating mirror 106 is adjusted at a high speed by piezoelectric-actuator.Piezoelectricity executes member
Part is controlled by voltage control system, makes light spectrum image-forming in the position of line scan image sensor in minimum pixel interval
It is moved.In this way, being incident on the light path of imaging lens 108 will change, the striped on linear array detector 109 is converged to
Also corresponding variation occurs.By adjusting the rotation angle of collimating mirror, it can realize the minute movement of striped, be improved to reach
The effect of measuring accuracy.
Embodiment 3
Fig. 4 schematically shows the optical fiber grating regulating system that detector array spectral resolution is improved using fine motion grating
Structural schematic diagram.As shown in figure 4, spectro-grating 107 is adjusted, spectro-grating is made to be rotated along the directions shown by arrow d, rotated
Angle is counterclockwise or to rotate clockwise 10 ° -30 °.Spectro-grating 107 is adjusted at a high speed by piezoelectric-actuator.Piezoelectricity is held
Units are controlled by voltage control system, make light spectrum image-forming in the position of line scan image sensor in minimum pixel interval model
Enclose interior moved.In this way, being incident on the light path of imaging lens 108 will change, converge on linear array detector 109
Striped also occurs to change accordingly.By adjusting the rotation angle of spectro-grating, the minute movement of striped can be realized, to reach
To the effect for improving measuring accuracy.
Embodiment 4
Fig. 5 schematically shows the optical fiber grating regulating system finely tuned using imaging lens and improve detector array spectral resolution
Structural schematic diagram.As shown in figure 5, imaging lens 108 are adjusted, spectro-grating is made to be rotated along the directions shown by arrow e, rotated
Angle is counterclockwise or to rotate clockwise 10 ° -30 °.Imaging lens 108 are adjusted at a high speed by piezoelectric-actuator.Piezoelectricity executes
Element is controlled by voltage control system, makes light spectrum image-forming in the position of line scan image sensor in minimum pixel interval
It is inside moved, the striped converged on linear array detector 109 also occurs to change accordingly.By the rotation angle for adjusting imaging lens
Degree, can realize the minute movement of striped, to have the function that improve measuring accuracy.
Embodiment 5
Fig. 6 schematically shows the fiber grating demodulation finely tuned using linear array detector and improve detector array spectral resolution
The structural schematic diagram of system.As shown in figure 5, linear array detector 109 is adjusted, make spectro-grating along the directions shown by arrow f
It moves left and right.Slit moving step length is 0.1 micron, and adjustable range is between 0-1 centimetres.Linear array detector 109 is held by piezoelectricity
Units at a high speed adjust.Piezoelectric-actuator is controlled by voltage control system, and light spectrum image-forming is made to be sensed in linear array images
It is moved in minimum pixel interval the position of device.By adjusting the rotation angle of linear array detector, item can be realized
The minute movement of line, to have the function that improve measuring accuracy.
Embodiment 6
Fig. 7 schematically shows the structural schematic diagram for the optical fiber grating regulating system for improving detector array spectral resolution.
As shown in fig. 7, at least two in slit, diaphragm, spectro-grating, collimating mirror, imaging lens and linear array detector are finely adjusted,
The slit, diaphragm, spectro-grating, collimating mirror, imaging lens and linear array detector are adjusted at a high speed by piezoelectric-actuator.Pressure
Electric executive component is controlled by voltage control system, makes light spectrum image-forming in the position of line scan image sensor between minimum pixel
Every being moved in range.By the rotation angle for adjusting slit, diaphragm, spectro-grating, collimating mirror, imaging lens and linear array detector
Degree, to have the function that improve measuring accuracy.
Fig. 8 schematically shows the fiber grating demodulation system according to the present invention for improving line scan image sensor spectral resolution
The flow chart of the feedback of system.Specific control method is as follows：
First, step 801, piezoelectric-actuator is adjusted to least significant end, this voltage is initial adjustment voltage；
Step 802, record least significant end spectroscopic data is initial spectrum；
Step 803, half step distance adjusts piezoelectric element, and piezoelectric element is position servo, is instructed by input position, is adjusted respectively
Slit, spectro-grating, collimating mirror, imaging lens or linear array detector are saved, current light spectrum and initial spectrum are calculated.Adjust Gaussian image
When the displacement distance on CCD reaches a pixel wide, that is, single pass is completed, each secondary measurement data point of single pass
Other interpolation forms a more smooth curve.Its processing procedure is such, and the output of pixel is the segmentation to light intensity curve
Integral, when there is 256 pixels, then can obtain 256 subsection integral values：{ I0, I1, I2 ... ... ..I255 }, works as pixel
When being scanned along a direction fine motion, another ordered series of numbers is obtained：I0 ', I1 ', I2 ' ... ... ..I255 ' }, the former will be gone before this ordered series of numbers,
It obtains：{ I0 '-I0, I1 '-I1, I2 '-I2 ... ... I255 '-I255, }, i.e. { G1-G0, G2-G1, G3-G2 ... ... }.Wherein
G0 indicates the light intensity true value (attention is 0 position, rather than the light intensity integral in pixel dimension) of the 0th position, and G1 indicates 1 position
Light intensity value.It sums to this ordered series of numbers, obtains { G1-G0, G2-G0, G3-G0 ... ... G255-G0 }, what is obtained in this way is
New value after primary fine tuning, followed by the new value after second of fine tuning just obtains the interpolation of n times if having finely tuned n times.
Step 804, for the first time the degree of correlation peak value when adjusting voltage be recorded as eventually adjust voltage；
Step 805, several grades are divided between tune voltage by initial adjustment voltage and eventually, slit is determined according to each grade
The rotation angle of displacement distance or spectro-grating, collimating mirror, imaging lens or linear array detector.
Step 806, return to step 803, demodulation every time measures each grade, to obtain higher spatial discrimination
Rate.
Fig. 9 (a) -9 (c) shows that the present invention adjusts slit, spectro-grating, collimating mirror, imaging lens or linear array detector and carries
The principle of EO-1 hyperion spatial resolution.Fig. 9 (a) shows light intensity in space in one-dimensional Gaussian curve distribution map.One light intensity exists
Space is irradiated in the light beam of one-dimensional Gaussian curve distribution on a ccd sensor, each pixel close-packed arrays of CCD, each picture
Element is equivalent to a perpendicular lattice, and as shown in Fig. 9 (a), the output of pixel is really the product to falling light intensity total amount on a pixel
Point.Since discretization is excessive, cause it is relatively low to image resolution ratio, for improve curve sampling number, pass through adjust slit, light splitting
Grating, collimating mirror, imaging lens or linear array detector are equivalent to movement to change position of the Gaussian curve on ccd sensor
Ccd sensor is acquired the different location of curve.Slit, spectro-grating, collimating mirror, imaging lens or linear array detector it is micro-
It adjusts, is equivalent to the fine position to sensor, thus obtains finer and smoother to curve portray.Fig. 9 (b) is narrow not adjust
The result figure after multiple measurement results interpolation after being scanned when seam, spectro-grating, collimating mirror, imaging lens or linear array detector.Fig. 9
(c) to adjust slit, spectro-grating, collimating mirror, imaging lens or linear array detector after multiple measurement results interpolation when after scanning
Result figure.By Fig. 9 (b) and 9 (c) it is found that adjusting slit, spectro-grating, collimating mirror, imaging lens or linear array detector, adjust
Gaussian image completes single pass when the displacement distance on CCD reaches a pixel wide, each survey of single pass
It measures data and distinguishes interpolation, form a more smooth curve.
Explanation in conjunction with the present invention disclosed here and practice, the other embodiment of the present invention is for those skilled in the art
It all will be readily apparent and understand.Illustrate and embodiment is regarded only as being exemplary, true scope of the invention and purport are equal
It is defined in the claims.
Claims (3)
1. a kind of fiber grating demodulation method improving line scan image sensor spectral resolution using fine motion detector array, institute
The side of stating includes
Build demodulating system, the demodulating system include pumping source, wavelength division multiplexer, bragg grating, diaphragm, slit,
Collimating mirror, spectro-grating, imaging lens and linear array detector, piezoelectric-actuator and voltage control system,
The wherein described pumping source, wavelength division multiplexer and bragg grating are sequentially connected, and the wavelength division multiplexer connects simultaneously
Diaphragm,
Enter bragg grating, the bragg fiber after the coupling that the light that the pumping source is sent out passes through wavelength division multiplexer
The reflectance spectrum of grating enters optical fiber grating regulating system as injection light,
After injection light is by slit, the reflection of collimating mirror, spectro-grating, imaging lens is passed sequentially through, finally converges to linear array detection
On device,
The linear array detector moves left and right slight distance along its long axis direction；
The feedback for wherein improving the optical fiber grating regulating system of spectral resolution is the linear array detector movement
The method of slight distance, is as follows：
A) piezoelectric-actuator is adjusted to least significant end, this voltage is initial adjustment voltage；
B) record least significant end spectroscopic data is initial spectrum；
C) half step distance adjusts piezoelectric-actuator, and the piezoelectric-actuator is position servo, and piezoelectric-actuator passes through piezoelectricity
Control system controls, and so that light spectrum image-forming is moved in minimum pixel interval in the position of linear array detector, passes through
Input position instruction is dynamic to control linear array detector progress micro-shifting, i.e., the spatial position of incident light is adjusted, final to determine
Light spectrum image-forming position, and record current light spectrum；
Pixel output is the subsection integral to light intensity curve, adjusts displacement distance of the Gaussian image on linear array detector and reaches one
When a pixel wide, that is, single pass is completed, each secondary measurement data of scanning is distinguished interpolation, forms a more smooth song
Line,
Wherein when there are 256 pixels, then 256 subsection integral values can be obtained：{ I0, I1, I2 ... ... ..I255 }, works as picture
When element is scanned along a direction fine motion, another ordered series of numbers is obtained：I0 ', I1 ', and I2 ' ... ... ..I255 ' }, before being gone before this ordered series of numbers
Person obtains：{ I0 '-I0, I1 '-I1, I2 '-I2 ... ... I255 '-I255, }, i.e. { G1-G0, G2-G1, G3-G2 ... ... }；Its
Middle G0 indicates that the light intensity true value of the 0th position, G1 indicate the light intensity value of 1 position；It sums to this ordered series of numbers, obtains { G1-G0, G2-
G0, G3-G0 ... ... G255-G0 }, what is obtained in this way is the new value after finely tuning for the first time, followed by new after second of fine tuning
Value, if having finely tuned n times, just obtains the interpolation of n times；
D) for the first time the degree of correlation peak value when adjusting voltage be recorded as eventually adjust voltage；
E) several grades are divided between tune voltage by initial adjustment voltage and eventually, demodulation every time measures each grade, to obtain
Higher spatial resolution.
2. optical fiber grating regulating system as described in claim 1, wherein the linear array detector moving range 0-1 centimetres it
Between.
3. optical fiber grating regulating system as claimed in claim 2, wherein the linear array detector by piezoelectric-actuator come
High speed adjusts.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2015106613051 | 2015-10-14 | ||
| CN201510661305 | 2015-10-14 | ||
| CN201610200413.3A CN105890759B (en) | 2015-10-14 | 2016-03-31 | The optical fiber grating regulating system of spectral resolution is improved using fine motion detector array |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610200413.3A Division CN105890759B (en) | 2015-10-14 | 2016-03-31 | The optical fiber grating regulating system of spectral resolution is improved using fine motion detector array |
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| CN108387314A true CN108387314A (en) | 2018-08-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5933235A (en) * | 1995-03-15 | 1999-08-03 | Yokogawa Electric Corporation | Optical spectrum analyzer and spectrometer |
| CN1373350A (en) * | 2002-03-29 | 2002-10-09 | 武汉光迅科技有限责任公司 | Method for improving wavelength resolution of optical performance monitor |
| CN101158599A (en) * | 2007-11-13 | 2008-04-09 | 清华大学 | Wavelength calibration method of optical spectrum instruments |
| CN104501955A (en) * | 2014-12-25 | 2015-04-08 | 中国科学院长春光学精密机械与物理研究所 | Grating spectrometer capable of realizing spectral super-resolution reduction |
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| US6983090B2 (en) * | 2002-03-21 | 2006-01-03 | Jds Uniphase Inc. | High resolution tunable optical filter |
| CN101793570B (en) * | 2009-10-21 | 2012-08-08 | 南京大学 | Sensing method of optical-fiber Bragg grating laser device |
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| US5933235A (en) * | 1995-03-15 | 1999-08-03 | Yokogawa Electric Corporation | Optical spectrum analyzer and spectrometer |
| CN1373350A (en) * | 2002-03-29 | 2002-10-09 | 武汉光迅科技有限责任公司 | Method for improving wavelength resolution of optical performance monitor |
| CN101158599A (en) * | 2007-11-13 | 2008-04-09 | 清华大学 | Wavelength calibration method of optical spectrum instruments |
| CN104501955A (en) * | 2014-12-25 | 2015-04-08 | 中国科学院长春光学精密机械与物理研究所 | Grating spectrometer capable of realizing spectral super-resolution reduction |
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