CN109115341A - A kind of Fourier spectrometer spectrum recovering device and restored method - Google Patents
A kind of Fourier spectrometer spectrum recovering device and restored method Download PDFInfo
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- CN109115341A CN109115341A CN201810764240.7A CN201810764240A CN109115341A CN 109115341 A CN109115341 A CN 109115341A CN 201810764240 A CN201810764240 A CN 201810764240A CN 109115341 A CN109115341 A CN 109115341A
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- 238000001228 spectrum Methods 0.000 title claims abstract description 44
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- 230000003287 optical effect Effects 0.000 claims abstract description 35
- 239000013307 optical fiber Substances 0.000 claims abstract description 19
- 230000002123 temporal effect Effects 0.000 claims abstract description 13
- 238000011084 recovery Methods 0.000 claims abstract description 10
- 230000009466 transformation Effects 0.000 claims description 25
- 230000002146 bilateral effect Effects 0.000 claims description 21
- 239000000835 fiber Substances 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 5
- 230000011218 segmentation Effects 0.000 claims description 5
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- 238000006243 chemical reaction Methods 0.000 claims description 2
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- 238000000605 extraction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
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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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- 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
- G01J3/0208—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using focussing or collimating elements, e.g. lenses or mirrors; performing aberration correction
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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
- G01J3/0291—Housings; Spectrometer accessories; Spatial arrangement of elements, e.g. folded path arrangements
Abstract
The invention discloses a kind of Fourier spectrometer spectrum recovering device and restored methods, its restoring means includes wideband light source, laser, wideband light source, laser coupled enter optical fiber, block prism is provided with after the optical fiber, the block prism side is provided with mobile mirror, the other side is provided with stationary mirror, side is provided with dichroscope again, the dichroscope side is provided with broadband photodetector plus lens and broadband photodetector, and the other side is provided with laser detector plus lens, laser detector.Its restored method, comprising the following steps: build optical interference circuit, adjusting mobile mirror makes two beam reflecting interferences, interference light is divided and receive the broadband light spectrum after being converted into electric signal, acquisition wide-band interference data and narrow-band interference data, data being carried out with equipotential phase temporal interpolation, is restored by new wide-band interference data acquisition.The present invention can make the spectrum of micro spectrometer obtain accurate and stable recovery, improve its global reliability.
Description
Technical field
The invention belongs to spectrometer technical fields, and in particular to a kind of Fourier spectrometer spectrum recovering device and recovery side
Method.
Background technique
Spectrometer is the important means of modern production and scientific research, with the market of production and product quality non-destructive testing
Demand is growing, and spectrometer micromation is most important.Due to being limited by space after spectrometer micromation, structure is without image of Buddha routine
Spectrometer is equally complicated, to guarantee that the stabilization of spectrum property is that micro spectrometer is generally existing and asks under the premise of structure simplifies
Topic.
Summary of the invention
The present invention proposes that the purpose is to provide a kind of Fourier spectrometer spectrum in order to solve the problems existing in the prior art
Restoring means and restored method.
The technical scheme is that a kind of Fourier spectrometer spectrum recovering device, including wideband light source, laser, institute
State wideband light source, laser coupled enters optical fiber, the block prism of light splitting, the block prism side are provided with after the optical fiber
It is provided with the mobile mirror of reflective light, the block prism other side is provided with the fixation reflex of reflected refraction light
Mirror, side is provided with the dichroscope being divided to interference light to the block prism again, and the dichroscope side is provided with
Broadband photodetector plus lens and broadband photodetector, it is saturating that the dichroscope other side is provided with laser detector convergence
Mirror, laser detector.
The broadband photodetector, laser detector circuit are linked into capture card, and the capture card is linked into computer
In.
The capture card is also connected with control card circuit, and the control card drives mobile mirror.
Fiber collimating lenses are provided between the optical fiber and block prism.
The mobile mirror is mobile towards or away from block prism.
A kind of restored method of Fourier spectrometer spectrum recovering device, comprising the following steps:
(I) builds optical interference circuit
Wideband light source and laser are mixed by optical fiber, and the emergent light of optical fiber enters optical interference circuit by fiber collimating lenses,
Emergent light is divided into two-way propagation after being incident on block prism, is refracted into stationary mirror all the way, is in addition transmitted into shifting all the way
Dynamic reflecting mirror.
(II), which adjusts mobile mirror, makes two beam reflecting interferences
Mobile mobile mirror makes mobile mirror, and the light that the light and mobile mirror that stationary mirror is reflected back are reflected back is vertical
Interference light is formed at square glass prism.
Interference light is divided and receives by (III) is converted into electric signal
The interference light that block prism is emitted is divided into two-way by dichroscope, is all the way wide-band interference light, which is visited by laser
It is received after surveying device plus lens by laser detector, is converted into wide-band interference electric signal, be in addition all the way laser narrow-band interference light,
The road light is converted into narrow-band interference electric signal by being received after broadband photodetector plus lens by broadband photodetector.
(IV) obtains wide-band interference data and narrow-band interference data
The synchronization signal that capture card is exported by control card triggers, and two-way interference electric signal in step (III) is carried out while being acquired,
Wide-band interference data and narrow-band interference data are obtained, capture card is acquired the broadband light of half of drive cycle signal by computer settings
With narrowband interference of light electric signal, when capture card one acquisition finishes, the data of acquisition and recording are N number of broadband optical interference signals voltage
Value Data and N number of acquisition time Value Data and N number of narrowband optical interference signals voltage value data and N number of acquisition time Value Data.
(V) carries out equipotential phase temporal interpolation to data
Continuous phase information is extracted to narrow band light interference data in step (IV), and carries out equipotential phase temporal interpolation, obtains equipotential
Equipotential phase temporal interpolation point is carried out interpolation to wide-band interference data and extracts new wide-band interference data by phase temporal interpolation point.
(VI) passes through the broadband light spectrum after the recovery of new wide-band interference data acquisition
Wide-band interference data new in step (V) are subjected to the small bilateral Fourier transformation of adding window zero padding, small bilateral Fourier is calculated and becomes
Data bit phase after changing, to new wide-band interference data carry out adding window zero padding Fourier transformation and will small bilateral transformed position phase into
Row compensates, and the data modulus after phase compensation removes the broadband light spectrum after mirror image is restored.
Step (V) comprises the following specific steps that:
Firstly, carrying out Fourier transformation to N number of narrowband interference of light voltage value data point and multiplied by 2, by the N/2 after Fourier transformation
~ N number of narrowband optical interference signals data do inverse Fourier transform after being set to zero again, and the data after inverse Fourier transform contain real part and void
The imaginary part of each data is negated phase that tangent obtains as the N number of voltage of narrowband optical interference signals divided by raw voltage values by portion
The instantaneous phase of Value Data point, and carry out phase unwrapping using the instantaneous phase of first data point as starting point and obtain narrow band light
The continuous phase of the N number of voltage value data point of interference signal.
Secondly, the continuous phase to narrowband optical interference signals N number of voltage value data point carries out being averaged for N*20 data point
Segmentation obtains N* to narrowband optical interference signals N number of time value data point progress interpolation using Quadric spline curve interpolation method
20 sampling time value data points.
Finally, obtaining N*20 sampling time value data point to broadband optical interference signals using narrow-band interference signal interpolation
N number of voltage value data carries out interpolation, obtains N*20 new wide-band interference signal voltage value data points, wherein the broadband interference of light is believed
N number of acquisition time data point is identical with N number of time value data point of narrowband optical interference signals.
Step (VI) comprises the following specific steps that:
Firstly, N*20 new wide-band interference voltage value data points have maximum extreme point, which is located in data dot sequency
M-th, 0 < M < N*5, the data point for intercepting 1 ~ N*50 carries out adding window multiplied by symmetric triangular wave, to the N*5 voltage after adding window
Value Data carries out the symmetrical zero padding of head and the tail and total amount of data is made to be N*30.
Secondly, N*20 new wide-band interference voltage value data points have maximum extreme point, it is suitable which is located at data point
N*20 data point is carried out adding window multiplied by asymmetric triangular wave by m-th in sequence, 0 < M < N*5, to this N*20 electricity after adding window
Pressure Value Data carries out head end zero padding and total amount of data is made to be N*30.
Again, the new interference signal after adding window zero padding is N*30 voltage value data point, the small bilateral number after adding window zero padding
According to for N*30 voltage value data point, Fourier transformation is carried out to small bilateral N*30 data point, and calculate the instantaneous of data point
Phase is that N*30 voltage value data point carries out Fourier transformation to new interference signal, and the data point after the Fourier transformation is every
A point includes real and imaginary parts, and real part is added imaginary part multiplied by small bilateral data phase multiplied by the cosine of small bilateral data phase
Sine carries out phase compensation.
Finally, after phase compensation, the Fourier transformation value modulus of N*30 voltage data of new interference signal, after modulus
Data cutout before 1 ~ N*15 data, the broadband light spectrum as restored.
The mobile mirror drives translation mechanism to realize reflecting mirror linear movement by driving signal.
The mobile mirror initial position is L1, moving distance L, stationary mirror apart from block prism surface distance
The opposite block prism surface distance of distance is L2, wherein 0 < | L1-L2 | < L/4.
Method of the present invention by phase extraction segmentation and interpolation, accurate reacquisition broadband optical interference signals, and
The stable recovery broadband light spectrum of method when broadband light spectrum recovering by phase compensation.It can be made using method of the invention
The spectrum of micro spectrometer obtains accurate and stable recovery, and the application for being conducive to micro spectrometer obtains guaranteed reliability.
Master of the present invention to be protected is the acquisition that calibration interference data in narrowband is realized in a set of optical interference circuit, is realized in Fu
The accurate acquisition of leaf spectrometer mobile mirror shift position, while position phase interpolation, phase compensation are used in spectrum recovering
Method ensure the accurate of spectrum and stablize restore.
Detailed description of the invention
Fig. 1 is the connection schematic diagram of restoring means in the present invention；
Fig. 2 is the method flow diagram of restored method in the present invention；
Wherein:
1 wideband light source, 2 laser
3 optical fiber, 4 fiber collimating lenses
5 block prism, 6 stationary mirror
7 mobile mirror, 8 dichroscope
9 broadband photodetector plus lens, 10 broadband photodetector
11 laser detector plus lens, 12 laser detector
13 control card, 14 capture card
15 computers.
Specific embodiment
Hereinafter, referring to drawings and examples, the present invention is described in detail:
As shown in Figure 1 and 2, a kind of Fourier spectrometer spectrum recovering device, including wideband light source 1, laser 2, the wideband light source
1, laser 2 is coupled into optical fiber 3, and the block prism 5 of light splitting, 5 side of the block prism setting are provided with after the optical fiber 3
There is the mobile mirror 7 of reflective light, 5 other side of block prism is provided with the stationary mirror of reflected refraction light
6, side is provided with the dichroscope 8 being divided to interference light, 8 side of the dichroscope setting to the block prism 5 again
There are broadband photodetector plus lens 9 and broadband photodetector 10,8 other side of dichroscope is provided with laser detector remittance
Poly- lens 11, laser detector 12.
The broadband photodetector 10,12 circuit of laser detector are linked into capture card 14, and the capture card 14 accesses
Into computer.
The capture card 14 is also connected with 13 circuit of control card, and the control card 13 drives mobile mirror 7.
Fiber collimating lenses 4 are provided between the optical fiber 3 and block prism 5.
The mobile mirror 7 is mobile towards or away from block prism 5.
Wideband light source 1 and laser 2 are coupled into two-in-one optical fiber 3 simultaneously, and the light of fiber exit passes through fiber collimating lenses 4
It is divided into two-way light propagation through block prism 5 after collimation, light penetrates block prism 5 and is incident on mobile mirror 7 and reflects all the way
Return block prism.In addition light then passes through after block prism 5 carries out optical path turnover and is incident on reflecting mirror 6 all the way, and reflecting mirror is by light
Former road is reflected back block prism 5.The light that this two-way is reflected back forms interference light at block prism 5, which continues to propagate
To dichroscope 8.Interference light is divided into two-way light propagation by dichroscope, and light passes through plus lens 9 after penetrating dichroscope 8 all the way
It is received by broadband photodetector 10.In addition light by dichroscope reflexes to plus lens 11 all the way, and is connect by laser detector 12
It receives.Broadband photodetector 10 and laser detector 12 carry out photoelectric conversion, output to wide-band interference light and laser interference in real time
Wide-band interference photovoltage value signal and laser interference voltage value signal.
13 output drive signal of control card and synchronization signal, driving signal are used to drive the mobile mechanism of mobile mirror 7
Realize movement, synchronization signal is used to the acquisition function of triggering collection card 14, it is ensured that when mobile mirror 7 is mobile, capture card 14 is same
Step starts to acquire wide-band interference photovoltage value signal and laser interference voltage value signal.Computer 15 acquires capture card 14
Interference signal is handled, and the spectrum of broadband light out is restored by the spectrum recovering method of this patent.
A kind of restored method of Fourier spectrometer spectrum recovering device, comprising the following steps:
I builds optical interference circuit
Wideband light source 1 and laser 2 are mixed by optical fiber 3, and the emergent light of optical fiber 3 enters interference by fiber collimating lenses 4
Optical path, emergent light are divided into two-way propagation after being incident on block prism 5, are refracted into stationary mirror 6 all the way, in addition transmit all the way
Into mobile mirror 7.
II, which adjusts mobile mirror, makes two beam reflecting interferences
Mobile mobile mirror 7 makes mobile mirror 7, the light that the light and mobile mirror 7 that stationary mirror 6 is reflected back are reflected back
Interference light is formed at block prism 5.
Interference light is divided and receives by III is converted into electric signal
The interference light that block prism 5 is emitted is divided into two-way by dichroscope 8, is all the way wide-band interference light, which passes through laser
It is received after detector plus lens 11 by laser detector 12, is converted into wide-band interference electric signal, be in addition all the way laser narrow-band
Interference light, the road light are converted into narrow-band interference electricity by receiving 10 by broadband photodetector after broadband photodetector plus lens 9
Signal.
IV obtains wide-band interference data and narrow-band interference data
The synchronization signal that capture card 14 is exported by control card 13 triggers, and two-way interference electric signal in step III is carried out while being adopted
Collection, obtains wide-band interference data and narrow-band interference data, and capture card 14 sets half of drive cycle signal of acquisition by computer 15
Broadband light and narrowband interference of light electric signal, when 14 one acquisition of capture card finishes, the data of acquisition and recording are dry for N number of broadband light
Relate to signal voltage Value Data and N number of acquisition time Value Data and N number of narrowband optical interference signals voltage value data and N number of acquisition time
Value Data.
V carries out equipotential phase temporal interpolation to data
Continuous phase information is extracted to narrow band light interference data in step IV, and carries out equipotential phase temporal interpolation, obtains equipotential phase
Equipotential phase temporal interpolation point is carried out interpolation to wide-band interference data and extracts new wide-band interference data by temporal interpolation point.
VI passes through the broadband light spectrum after the recovery of new wide-band interference data acquisition
Wide-band interference data new in step V are subjected to the small bilateral Fourier transformation of adding window zero padding, calculate small bilateral Fourier transformation
Data bit phase afterwards carries out adding window zero padding Fourier transformation to new wide-band interference data and mutually carries out small bilateral transformed position
It compensates, the data modulus after phase compensation removes the broadband light spectrum after mirror image is restored.
Step V comprises the following specific steps that:
Firstly, carrying out Fourier transformation to N number of narrowband interference of light voltage value data point and multiplied by 2, by the N/2 after Fourier transformation
~ N number of narrowband optical interference signals data do inverse Fourier transform after being set to zero again, and the data after inverse Fourier transform contain real part and void
The imaginary part of each data is negated phase that tangent obtains as the N number of voltage of narrowband optical interference signals divided by raw voltage values by portion
The instantaneous phase of Value Data point, and carry out phase unwrapping using the instantaneous phase of first data point as starting point and obtain narrow band light
The continuous phase of the N number of voltage value data point of interference signal.
Secondly, the continuous phase to narrowband optical interference signals N number of voltage value data point carries out being averaged for N*20 data point
Segmentation obtains N* to narrowband optical interference signals N number of time value data point progress interpolation using Quadric spline curve interpolation method
20 sampling time value data points.
Finally, obtaining N*20 sampling time value data point to broadband optical interference signals using narrow-band interference signal interpolation
N number of voltage value data carries out interpolation, obtains N*20 new wide-band interference signal voltage value data points, wherein the broadband interference of light is believed
N number of acquisition time data point is identical with N number of time value data point of narrowband optical interference signals.
Step VI comprises the following specific steps that:
Firstly, N*20 new wide-band interference voltage value data points have maximum extreme point, which is located in data dot sequency
M-th, 0 < M < N*5, the data point for intercepting 1 ~ N*50 carries out adding window multiplied by symmetric triangular wave, to the N*5 voltage after adding window
Value Data carries out the symmetrical zero padding of head and the tail and total amount of data is made to be N*30.
Secondly, N*20 new wide-band interference voltage value data points have maximum extreme point, it is suitable which is located at data point
N*20 data point is carried out adding window multiplied by asymmetric triangular wave by m-th in sequence, 0 < M < N*5, to this N*20 electricity after adding window
Pressure Value Data carries out head end zero padding and total amount of data is made to be N*30.
Again, the new interference signal after adding window zero padding is N*30 voltage value data point, the small bilateral number after adding window zero padding
According to for N*30 voltage value data point, Fourier transformation is carried out to small bilateral N*30 data point, and calculate the instantaneous of data point
Phase is that N*30 voltage value data point carries out Fourier transformation to new interference signal, and the data point after the Fourier transformation is every
A point includes real and imaginary parts, and real part is added imaginary part multiplied by small bilateral data phase multiplied by the cosine of small bilateral data phase
Sinusoidal string carries out phase compensation.
Finally, after phase compensation, the Fourier transformation value modulus of N*30 voltage data of new interference signal, after modulus
Data cutout before 1 ~ N*15 data, the broadband light spectrum as restored.
The mobile mirror 7 drives translation mechanism to realize reflecting mirror linear movement by driving signal.
7 initial position of mobile mirror is L1, moving distance L, fixation reflex apart from 5 surface distance of block prism
The opposite block prism surface distance of mirror distance is L2, wherein 0 < | L1-L2 | < L/4.
Spectrometer spectrum recovering method of the invention records the displacement number of mobile mirror 7 by using laser interference signal
According to, and by the method for phase extraction segmentation and interpolation, broadband optical interference signals are accurately reacquired, and in broadband light spectrum
The stable recovery broadband light spectrum of method when recovery by phase compensation.Micro spectrometer can be made using method of the invention
Spectrum obtain accurate and stable recovery, be conducive to micro spectrometer application obtain guaranteed reliability.
Master of the present invention to be protected is the acquisition that calibration interference data in narrowband is realized in a set of optical interference circuit, is realized in Fu
The accurate acquisition of leaf spectrometer mobile mirror shift position, while position phase interpolation, phase compensation are used in spectrum recovering
Method ensure the accurate of spectrum and stablize restore.
Claims (10)
1. a kind of Fourier spectrometer spectrum recovering device, including wideband light source (1), laser (2), it is characterised in that: the width
Band light source (1), laser (2) are coupled into optical fiber (3), and the block prism (5) of light splitting is provided with after the optical fiber (3), described
Block prism (5) side is provided with the mobile mirror (7) of reflected light, and block prism (5) other side is provided with reflection
The stationary mirror (6) of light is reflected, the block prism (5) is provided with the dichroscope being divided to interference light in side again
(8), dichroscope (8) side is provided with broadband photodetector plus lens (9) and broadband photodetector (10), and described two
Look mirror (8) other side is provided with laser detector plus lens (11), laser detector (12).
2. a kind of Fourier spectrometer spectrum recovering device according to claim 1, it is characterised in that: the broadband light is visited
Survey device (10), laser detector (12) circuit are linked into capture card (14), and the capture card (14) is linked into computer.
3. a kind of Fourier spectrometer spectrum recovering device according to claim 2, it is characterised in that: the capture card
(14) also it is connected with control card (13) circuit, the control card (13) drives mobile mirror (7).
4. a kind of Fourier spectrometer spectrum recovering device according to claim 1, it is characterised in that: the optical fiber (3)
Fiber collimating lenses (4) are provided between block prism (5).
5. a kind of Fourier spectrometer spectrum recovering device according to claim 1, it is characterised in that: the mobile reflection
Mirror (7) is mobile towards or away from block prism (5).
6. a kind of restored method of Fourier spectrometer spectrum recovering device, it is characterised in that: the following steps are included:
(I) builds optical interference circuit
Wideband light source (1) and laser (2) are mixed by optical fiber (3), and the emergent light of optical fiber (3) passes through fiber collimating lenses
(4) enter optical interference circuit, emergent light is divided into two-way propagation after being incident on block prism (5), is refracted into stationary mirror all the way
(6), it is in addition transmitted into all the way mobile mirror (7)；
(II), which adjusts mobile mirror, makes two beam reflecting interferences
Mobile mobile mirror (7) make mobile mirror (7), and the light and mobile mirror (7) that stationary mirror (6) is reflected back are anti-
The light being emitted back towards forms interference light at block prism (5)；
Interference light is divided and receives by (III) is converted into electric signal
The interference light that block prism (5) is emitted is divided into two-way by dichroscope (8), is all the way wide-band interference light, which passes through
It is received after laser detector plus lens (11) by laser detector (12), is converted into wide-band interference electric signal, is in addition all the way
Laser narrow-band interference light, the road light is by receiving (10) by broadband photodetector after broadband photodetector plus lens (9), conversion
At narrow-band interference electric signal；
(IV) obtains wide-band interference data and narrow-band interference data
The synchronization signal that capture card (14) is exported by control card (13) triggers, and carries out to two-way interference electric signal in step (III) same
When acquire, obtain wide-band interference data and narrow-band interference data, capture card (14) is by computer (15) setting half of driving of acquisition
The broadband light and narrowband interference of light electric signal of periodic signal, when capture card (14) one acquisition finishes, the data of acquisition and recording are N
A broadband optical interference signals voltage value data and N number of acquisition time Value Data and N number of narrowband optical interference signals voltage value data and N
A acquisition time Value Data；
(V) carries out equipotential phase temporal interpolation to data
Continuous phase information is extracted to narrow band light interference data in step (IV), and carries out equipotential phase temporal interpolation, obtains equipotential
Equipotential phase temporal interpolation point is carried out interpolation to wide-band interference data and extracts new wide-band interference data by phase temporal interpolation point；
(VI) passes through the broadband light spectrum after the recovery of new wide-band interference data acquisition
Wide-band interference data new in step (V) are subjected to the small bilateral Fourier transformation of adding window zero padding, small bilateral Fourier is calculated and becomes
Data bit phase after changing, to new wide-band interference data carry out adding window zero padding Fourier transformation and will small bilateral transformed position phase into
Row compensates, and the data modulus after phase compensation removes the broadband light spectrum after mirror image is restored.
7. a kind of restored method of Fourier spectrometer spectrum recovering device according to claim 6, it is characterised in that: step
Suddenly (V) comprises the following specific steps that:
Firstly, carrying out Fourier transformation to N number of narrowband interference of light voltage value data point and multiplied by 2, by the N/2 after Fourier transformation
~ N number of narrowband optical interference signals data do inverse Fourier transform after being set to zero again, and the data after inverse Fourier transform contain real part and void
The imaginary part of each data is negated phase that tangent obtains as the N number of voltage of narrowband optical interference signals divided by raw voltage values by portion
The instantaneous phase of Value Data point, and carry out phase unwrapping using the instantaneous phase of first data point as starting point and obtain narrow band light
The continuous phase of the N number of voltage value data point of interference signal；
Secondly, the average segmentation of N*20 data point is carried out to the continuous phase of narrowband optical interference signals N number of voltage value data point,
Using Quadric spline curve interpolation method, to obtaining to narrowband optical interference signals N number of time value data point progress interpolation, N*20 is a to be adopted
Sample time value data point；
Finally, obtaining N*20 sampling time value data point to the N number of of broadband optical interference signals using narrow-band interference signal interpolation
Voltage value data carries out interpolation, obtains N*20 new wide-band interference signal voltage value data points, wherein broadband interference of light letter is N number of
Acquisition time data point is identical with N number of time value data point of narrowband optical interference signals.
8. a kind of restored method of Fourier spectrometer spectrum recovering device according to claim 6, it is characterised in that: step
Suddenly (VI) comprises the following specific steps that:
Firstly, N*20 new wide-band interference voltage value data points have maximum extreme point, which is located in data dot sequency
M-th, 0 < M < N*5, the data point for intercepting 1 ~ N*50 carries out adding window multiplied by symmetric triangular wave, to the N*5 voltage after adding window
Value Data carries out the symmetrical zero padding of head and the tail and total amount of data is made to be N*30；
Secondly, N*20 new wide-band interference voltage value data points have maximum extreme point, which is located in data dot sequency
N*20 data point is carried out adding window multiplied by asymmetric triangular wave, to the N*20 voltage value after adding window by m-th, 0 < M < N*5
Data carry out head end zero padding and total amount of data are made to be N*30；
Again, the new interference signal after adding window zero padding is N*30 voltage value data point, and the small bilateral data after adding window zero padding are
N*30 voltage value data point carries out Fourier transformation to small bilateral N*30 data point, and calculates the instantaneous phase of data point,
It is that N*30 voltage value data point carries out Fourier transformation to new interference signal, each point packet of the data point after the Fourier transformation
Containing real and imaginary parts, by real part multiplied by small bilateral data phase cosine plus imaginary part multiplied by small bilateral data phase it is sinusoidal into
Row phase compensation；
Finally, after phase compensation, the Fourier transformation value modulus of N*30 voltage data of new interference signal, to the number after modulus
According to the preceding 1 ~ N*15 data of interception, the broadband light spectrum as restored.
9. a kind of restored method of Fourier spectrometer spectrum recovering device according to claim 6, it is characterised in that: institute
It states mobile mirror (7) and drives translation mechanism to realize reflecting mirror linear movement by driving signal.
10. a kind of restored method of Fourier spectrometer spectrum recovering device according to claim 9, it is characterised in that:
Mobile mirror (7) initial position apart from block prism (5) surface distance be L1, moving distance L, stationary mirror away from
It is L2 from opposite block prism surface distance, wherein 0 < | L1-L2 | < L/4.
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| CN201810764240.7A CN109115341B (en) | 2018-07-12 | 2018-07-12 | Fourier spectrometer spectrum recovery device and recovery method |
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| CN201810764240.7A CN109115341B (en) | 2018-07-12 | 2018-07-12 | Fourier spectrometer spectrum recovery device and recovery method |
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| CN109115341B CN109115341B (en) | 2021-05-18 |
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