CN105890751B - The optical fiber grating regulating system for improving spectral resolution is finely tuned using collimating mirror - Google Patents
The optical fiber grating regulating system for improving spectral resolution is finely tuned using collimating mirror Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 32
- 230000003595 spectral effect Effects 0.000 title claims abstract description 24
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 23
- 238000003384 imaging method Methods 0.000 claims abstract description 33
- 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
- 230000008878 coupling Effects 0.000 claims abstract description 4
- 238000010168 coupling process Methods 0.000 claims abstract description 4
- 238000005859 coupling reaction Methods 0.000 claims abstract description 4
- 238000001228 spectrum Methods 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 14
- 239000000835 fiber Substances 0.000 claims description 13
- 230000033001 locomotion Effects 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 3
- 238000004611 spectroscopical analysis Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 230000010354 integration Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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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
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
- G01J3/0237—Adjustable, e.g. focussing
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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
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
- G01J3/0243—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows having a through-hole enabling the optical element to fulfil an additional optical function, e.g. a mirror or grating having a throughhole for a light collecting or light injecting optical fiber
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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
- G01J3/2803—Investigating the spectrum using photoelectric array detector
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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
- G01J3/28—Investigating the spectrum
- G01J3/45—Interferometric spectrometry
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Abstract
The invention provides the optical fiber grating regulating system that a kind of fine setting of use collimating mirror improves spectral resolution, 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, 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 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, wherein described collimating mirror edge is counterclockwise or the minute angle that turns clockwise.
Description
Technical field
The present invention relates to sensory field of optic fibre, more particularly to a kind of use collimating mirror fine setting improves the optical fiber of spectral resolution
Grating demodulation system and method.
Background technology
Fiber grating is a kind of novel passive sensing element, with high sensitivity, and anti-electromagnetic interference capability is strong, corrosion-resistant etc.
Plurality of advantages, since for sensing, has had been achieved for the development of Fast Persistence, in the neck such as Aero-Space, building structure, oil
Had broad application prospects in terms of the safety monitoring in domain.Optical fiber grating regulating system is the key component of whole sensor-based system,
Realize that high accuracy, high-resolution, dynamic and static parameter are combined, multipoint multiplexing detection and low cost are fiber grating demodulation technologies
The trend of development.The method of optical fibre interrogation has a variety of, and 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 interferometric methods are easily affected by environment, are unfavorable for engineer applied.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 small volume based on light spectrum image-forming method, integration degree is high, available for measurement 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, be a key of (FBG) demodulator.
The optical system structure species 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, dispersion element is used as using plane reflection grating.This
On the one hand it is that cost of reproduction is cheap because plane grating design difficulty is low, diffraction efficiency is high；On the other hand it is due to Czerny-
Adjustable and arrangement the structural parameters of Turner structures are more, can avoid secondary or multiple diffraction, be easy to use 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 that, by its differentiation, its more compact structure, space availability ratio is high.However, due to linear array figure
As sensor pixel Limited Number, spectral space resolution ratio is restricted.
Accordingly, it is capable to which no realize that high-resolution gration wavelength is accurately demodulated in the case where line array sensor pixel is limited, it is
This area technical problem urgently to be resolved hurrily.
The content of the invention
It is an object of the invention to provide the fiber grating demodulation system that a kind of fine setting of use collimating mirror improves spectral resolution
System, the demodulating system includes pumping source, wavelength division multiplexer, bragg grating, diaphragm, slit, collimating mirror, light splitting light
Grid, imaging lens and linear array detector, piezoelectric-actuator and voltage control system, wherein the pumping source, wavelength division multiplexer and
Bragg grating is sequentially connected, and the wavelength division multiplexer connects diaphragm simultaneously, and the light that the pumping source is sent passes through wavelength-division
Enter bragg grating after the coupling of multiplexer, the reflectance spectrum of the bragg grating enters optical fiber as injection light
Grating demodulation system, after injection light is by slit, passes sequentially through the reflection of collimating mirror, spectro-grating, imaging lens, finally converges to
On linear array detector, wherein the collimating mirror along counterclockwise or the minute angle that turns clockwise.
Preferably, the minute angle is 10 ° -30 °.
Preferably, the collimating mirror is adjusted at a high speed by piezoelectric-actuator.
Preferably, the method for the rotation minute angle is as follows：
A) piezoelectric-actuator is adjusted to least significant end, and this voltage is initial adjustment voltage；
B) record least significant end spectroscopic data is initial spectrum；
C) half step distance regulation piezoelectric-actuator, calculates current light spectrum and initial spectrum, and the piezoelectric-actuator is position
Servo is put, controls collimating mirror to rotate minute angle by input position instruction, the locus of incident light is adjusted, most
Light spectrum image-forming position is determined eventually；
D) first the degree of correlation peak value when regulation voltage be recorded as eventually adjust voltage；
E) some grades are divided between tune voltage by initial adjustment voltage and eventually, demodulation every time is measured to 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 }, when
Pixel along a direction fine motion scan when, obtain another ordered series of numbers：I0 ', I1 ', I2 ' ... ..I255 ' }, before this ordered series of numbers
The former is gone, is obtained：{ I0 '-I0, I1 '-I1, I2 '-I2 ... I255 '-I255, }, i.e. { G1-G0, G2-G1, G3-
G2,......}；Wherein G0 represents the light intensity true value of the 0th position, and G1 represents the light intensity value of 1 position；This ordered series of numbers is summed,
Obtain G1-G0, G2-G0, G3-G0 ... G255-G0 }, what is so obtained is the new value after finely tuning for the first time, followed by the
New value after secondary fine setting, if having finely tuned n times, just obtains the interpolation of n times.
It should be appreciated that foregoing description substantially and follow-up description in detail are exemplary illustration and explanation, should not
As the limitation to claimed content of the invention.
Brief description of the drawings
With reference to the accompanying drawing enclosed, the present invention more purpose, function and advantages will pass through the as follows of embodiment of the present invention
Description is illustrated, wherein：
Fig. 1 is the structure of the optical fiber grating regulating system of the raising line scan image sensor spectral resolution according to the present invention
Schematic diagram；
Fig. 2 shows that use slit translates the optical fiber grating regulating system of raising line scan image sensor spectral resolution
Structural representation；
Fig. 3 shows the knot that the optical fiber grating regulating system for improving detector array spectral resolution is finely tuned using collimating mirror
Structure schematic diagram；
Fig. 4 schematically shows the optical fiber grating regulating system of use fine motion grating raising detector array spectral resolution
Structural representation；
Fig. 5 schematically shows the optical fiber grating regulating system finely tuned using imaging lens and improve detector array spectral resolution
Structural representation；
Fig. 6 schematically shows the fiber grating demodulation finely tuned using linear array detector and improve detector array spectral resolution
The structural representation of system；
Fig. 7 schematically shows the structural representation for the optical fiber grating regulating system for improving detector array spectral resolution；
Fig. 8 is schematically shown improves line scan image sensor spectral resolution according to the use collimating mirror fine setting of the present invention
The flow chart of the feedback of optical fiber grating regulating system；
Fig. 9 (a) shows that a light intensity is in one-dimensional Gaussian curve distribution map in space；
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 regulation slit after scanning.
Embodiment
Fig. 1 is the structure of the optical fiber grating regulating system of the raising line scan image sensor spectral resolution according to the present invention
Schematic diagram；A kind of use collimated light path fine motion that the present invention is provided improves the fiber grating of line scan image sensor spectral resolution
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)
102nd, bragg grating (FBG) 103, diaphragm 104, slit 105, spectro-grating 106, collimating mirror 107, the and of imaging lens 108
Linear array detector (CCD) 109.Pumping source 101, wavelength division multiplexer 102 and bragg grating 103 are sequentially connected, and wavelength-division is multiple
Diaphragm 104 is connected simultaneously with device 102.Enter Prague light after the coupling that the light that pumping source 101 is sent passes through wavelength division multiplexer 102
Fine grating 103, the reflectance spectrum of bragg grating 103 enters optical fiber grating regulating system as injection light.Injection light passes through
After slit 105, collimating mirror 106, spectro-grating 107, the reflection of imaging lens 108 are passed sequentially through, linear array detector is finally converged to
(CCD) on 109.
First, by pumping source 101, wavelength division multiplexer 102, the welding in the manner shown in figure 1 of bragg grating 103, its
Middle bragg grating 103 should have higher reflectivity and narrower line width.Ripple according to the embodiment of the present invention
Division multiplexer (WDM) 102, the parameter selection of bragg grating (FBG) 103 are required to same pumping wavelength, laser emitting ripple
Long parameter matching, specific parameter is as shown in table 1.
Table 1 according to the present invention demodulating system reflectance spectrum light source parameters
If being used as gain media, pumping source LD tail optical fibers, wavelength-division from core diameter for 10/125 μm of Er-doped fiber 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 range are 1530nm-1560nm, and laser output can be obtained within the range.Experiment
If in from 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 choose together
Template core diameter.Pumping source LD is 915nm single-mode outputs, wavelength division multiplexer WDM operation wavelength 915/1064nm, bragg fiber
Grating FBG is chosen near 1064nm, and laser output can be obtained within 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, afterwards by imaging lens 108, converges in
Linear array detector 109.
Spectro-grating 107 can be represented 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 grating
Constant.
N=0 is zero order spectrum, now, and β is unrelated with λ, i.e., acted on without light splitting；N=± 1, ± 2 correspond to first-order spectrum and
Second order spectrum, wherein first-order spectrum energy are strong, available 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 grating line number and the product of spectrum level, there can be formula (2) expression
R=nN (2)
It is 50mm for width, groove number is 1200/mm grating, and the resolution ratio of its first-order spectrum is 6 × 104.
Using the reflected light of bragg grating 103 as injection light source, the spectrum width of incident light is so reduced, in grating point
Resolution results under conditions of determining and is more spaced finer interference fringe.Now to slit, diaphragm, spectro-grating, standard
Straight mirror, imaging lens and linear array detector are adjusted, and control slit micro-shifting dynamic by input position instruction or control light splitting light
Grid, collimating mirror, micro- rotation of imaging lens and linear array detector, are adjusted to the locus of incident light, then incide imaging
The light path of mirror changes, and corresponding change also occurs for the striped converged on linear array detector, final to determine light spectrum image-forming position
Put.
Specifically, it is described in detail by following examples.
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 representation of system.As shown in Fig. 2 slit 105 is adjusted, slit is set to be moved along shown by arrow b directions, slit is moved
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
In the range of move.So, inciding the light path of imaging lens 108 will change, and converge on linear array detector 109
Corresponding change also occurs for striped.By adjusting the width of optical fiber entrance slit, the minute movement of striped can be realized, so as to reach
To the effect for improving 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 representation.As shown in figure 3, collimation mirror 106 is adjusted, collimating mirror is set to be rotated along shown by arrow c directions, the anglec of rotation
Spend for counterclockwise or turn clockwise 10 ° -30 °.Collimating mirror 106 is adjusted at a high speed by piezoelectric-actuator.Piezoelectricity performs 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
Move.So, inciding the light path of imaging lens 108 will change, the striped converged on linear array detector 109
Occurs corresponding change.By adjusting the anglec of rotation of collimating mirror, the minute movement of striped can be realized, so as to reach that raising is surveyed
Try the effect of precision.
Embodiment 3
Fig. 4 schematically shows the optical fiber grating regulating system of use fine motion grating raising detector array spectral resolution
Structural representation.As shown in figure 4, spectro-grating 107 is adjusted, spectro-grating is rotated along shown by arrow d directions, rotate
Angle is counterclockwise or turned 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
Moved in enclosing.So, inciding the light path of imaging lens 108 will change, the bar converged on linear array detector 109
Corresponding change also occurs for line.By adjusting the anglec of rotation of spectro-grating, the minute movement of striped can be realized, so as to reach
Improve the effect of 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 representation.As shown in figure 5, imaging lens 108 are adjusted, spectro-grating is rotated along shown by arrow e directions, rotate
Angle is counterclockwise or turned clockwise 10 ° -30 °.Imaging lens 108 are adjusted at a high speed by piezoelectric-actuator.Piezoelectricity is performed
Element is controlled by voltage control system, makes light spectrum image-forming in the position of line scan image sensor in minimum pixel interval
Inside move, corresponding change also occurs for the striped converged on linear array detector 109.By the anglec of rotation for adjusting imaging lens
Degree, can realize the minute movement of striped, so as to reach the effect for improving 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 representation of system.As shown in figure 5, linear array detector 109 is adjusted, make spectro-grating along shown by arrow f directions
Move 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 are at a high speed adjusted.Piezoelectric-actuator is controlled by voltage control system, light spectrum image-forming is sensed in linear array images
The position of device is moved in minimum pixel interval.By adjusting the anglec of rotation of linear array detector, bar can be realized
The minute movement of line, so as to reach the effect for improving measuring accuracy.
Embodiment 6
Fig. 7 schematically shows the structural representation 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
Moved in the range of.By adjusting slit, diaphragm, spectro-grating, collimating mirror, imaging lens and the anglec of rotation of linear array detector
Degree, so as to reach the effect for improving measuring accuracy.
Fig. 8 schematically shows the fiber grating demodulation system of the raising line scan image sensor spectral resolution according to the present invention
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, and this voltage is initial adjustment voltage；
Step 802, record least significant end spectroscopic data is initial spectrum；
Step 803, half step distance regulation piezoelectric element, piezoelectric element is position servo, is instructed, adjusted respectively by input position
Slit, spectro-grating, collimating mirror, imaging lens or linear array detector are saved, current light spectrum and initial spectrum is calculated.Adjust Gaussian image
When displacement on CCD reaches a pixel wide, that is, single pass is completed, each 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
Integration, when there is 256 pixels, then can obtain 256 subsection integral values：I0, I1, I2 ... and ..I255 }, work as pixel
When being scanned along a direction fine motion, another ordered series of numbers is obtained：I0 ', I1 ', 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,......}.Wherein G0 represent the 0th position light intensity true value (attention is 0 position, rather than in pixel dimension light intensity product
Point), G1 represents the light intensity value of 1 position.This ordered series of numbers is summed, obtain G1-G0, G2-G0, G3-G0 ... G255-
G0 }, what is so obtained is the new value after the new value after finely tuning for the first time, followed by second of fine setting, if having finely tuned n times, just
Obtain the interpolation of n times.
Step 804, first the degree of correlation peak value when regulation voltage be recorded as eventually adjust voltage；
Step 805, some grades are divided between tune voltage by initial adjustment voltage and eventually, slit is determined according to each grade
Displacement or spectro-grating, collimating mirror, the anglec of rotation of imaging lens or linear array detector.
Step 806, return to step 803, every time demodulation is measured to each grade, to obtain higher spatial discrimination
Rate.
Fig. 9 (a) -9 (c) shows that present invention regulation slit, spectro-grating, collimating mirror, imaging lens or linear array detector are carried
The principle of EO-1 hyperion spatial resolution.Fig. 9 (a) shows that light intensity is in one-dimensional Gaussian curve distribution map in space.One light intensity exists
The light beam that space is distributed in one-dimensional Gaussian curve is irradiated on a ccd sensor, CCD each pixel close-packed arrays, each picture
Plain equivalent to one perpendicular lattice, shown in such as Fig. 9 (a), the output of pixel is really the product to falling light intensity total amount on a pixel
Point.Because discretization is excessive, cause it is relatively low to image resolution ratio, for improve curve sampling number, by adjusting slit, light splitting
Grating, collimating mirror, imaging lens or linear array detector, to change position of the Gaussian curve on ccd sensor, equivalent to movement
Ccd sensor is acquired to the diverse location of curve.Slit, spectro-grating, collimating mirror, imaging lens or linear array detector it is micro-
Adjust, equivalent to the fine position to sensor, thus obtain finer and smoother to curve portray.Fig. 9 (b) is not adjust narrow
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) after multiple measurement results interpolation when for regulation slit, spectro-grating, collimating mirror, imaging lens or linear array detector after scanning
Result figure.From Fig. 9 (b) and 9 (c), regulation slit, spectro-grating, collimating mirror, imaging lens or linear array detector, regulation
When displacement of the Gaussian image on CCD reaches a pixel wide, that is, single pass is completed, each survey of single pass
Data difference interpolation is measured, a more smooth curve is formed.
With reference to the explanation of the invention disclosed here and practice, other embodiment of the invention is for those skilled in the art
It all will be readily apparent and understand.Illustrate and embodiment is to be considered only as exemplary, of the invention true scope and purport is equal
It is defined in the claims.
Claims (3)
1. a kind of use collimating mirror fine setting improves the optical fiber grating regulating system of spectral resolution, the demodulating system includes pumping
Source, wavelength division multiplexer, bragg grating, diaphragm, slit, collimating mirror, spectro-grating, imaging lens and linear array detector, pressure
Electric executive component and voltage control system,
Wherein described pumping source, wavelength division multiplexer and bragg grating are sequentially connected, and the wavelength division multiplexer is connected simultaneously
Diaphragm,
Enter bragg grating, the bragg fiber after the coupling that the light that the pumping source is sent 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, linear array detection is finally converged to
On device,
The slit, diaphragm, spectro-grating, collimating mirror, imaging lens and linear array detector are realized at a high speed by piezoelectric-actuator
Regulation；
Wherein described collimating mirror is along the counterclockwise or minute angle that turns clockwise, and the method for the collimating mirror rotation minute angle is such as
Under：
A) piezoelectric-actuator is adjusted to least significant end, and this voltage is initial adjustment voltage；
B) record least significant end spectroscopic data is initial spectrum；
C) half step distance regulation piezoelectric-actuator, calculates current light spectrum and initial spectrum, and the piezoelectric-actuator is watched for position
Clothes, are controlled collimating mirror to rotate minute angle by input position instruction, the locus of incident light are adjusted, final true
Determine light spectrum image-forming position；
D) first the degree of correlation peak value when regulation voltage be recorded as eventually adjust voltage；
E) some grades are divided between tune voltage by initial adjustment voltage and eventually, demodulation every time is measured to each grade, to obtain
Higher spatial resolution.
2. optical fiber grating regulating system as claimed in claim 1, wherein the minute angle is 10 ° -30 °.
3. optical fiber grating regulating system as claimed in claim 1, wherein the concrete processing procedure of the sub-step c) is as follows：
The output of pixel is the subsection integral to light intensity curve, when there is 256 pixels, then can obtain 256 subsection integrals
Value：{ I0, I1, I2 ... ... ..I255 }, when pixel is scanned along a direction fine motion, obtains another ordered series of numbers：I0 ', I1 ',
I2 ' ... ... ..I255 ' }, this ordered series of numbers is subtracted the former, obtained：I0 '-I0, I1 '-I1, I2 '-I2 ... ... I255 '-
I255, }, i.e., { G1-G0, G2-G1, G3-G2 ... ... }；Wherein G0 represents the light intensity true value of the 0th position, and G1 represents the light of 1 position
Intensity values；This ordered series of numbers is summed, { G255-G0 } is obtained, what is so obtained is the new value after finely tuning for the first time, followed by second
New value after secondary fine setting, if having finely tuned n times, just obtains the interpolation of n times.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510661497 | 2015-10-14 | ||
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