CN108919525A - A kind of adjustable filtering system of narrowband acousto-optic and its method with big angular aperture - Google Patents
A kind of adjustable filtering system of narrowband acousto-optic and its method with big angular aperture Download PDFInfo
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- CN108919525A CN108919525A CN201810426665.7A CN201810426665A CN108919525A CN 108919525 A CN108919525 A CN 108919525A CN 201810426665 A CN201810426665 A CN 201810426665A CN 108919525 A CN108919525 A CN 108919525A
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000001914 filtration Methods 0.000 title claims description 168
- 230000010287 polarization Effects 0.000 claims abstract description 120
- 238000001228 spectrum Methods 0.000 claims abstract description 49
- 238000004458 analytical method Methods 0.000 claims abstract description 32
- 230000003595 spectral effect Effects 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 230000008569 process Effects 0.000 claims description 13
- 230000004888 barrier function Effects 0.000 claims description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 11
- 229910052782 aluminium Inorganic materials 0.000 claims description 11
- 239000004411 aluminium Substances 0.000 claims description 11
- 238000004611 spectroscopical analysis Methods 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 9
- 239000000523 sample Substances 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 238000007743 anodising Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 229910052736 halogen Inorganic materials 0.000 claims description 3
- 150000002367 halogens Chemical class 0.000 claims 1
- 230000000149 penetrating effect Effects 0.000 claims 1
- 230000003287 optical effect Effects 0.000 abstract description 5
- 230000003993 interaction Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 125000005843 halogen group Chemical group 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- LAJZODKXOMJMPK-UHFFFAOYSA-N tellurium dioxide Chemical compound O=[Te]=O LAJZODKXOMJMPK-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000000701 chemical imaging Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229910052714 tellurium Inorganic materials 0.000 description 1
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/11—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
- G02F1/113—Circuit or control arrangements
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/11—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
- G02F1/116—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves using an optically anisotropic medium, wherein the incident and the diffracted light waves have different polarizations, e.g. acousto-optic tunable filter [AOTF]
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
本发明公开一种具有大角孔径的窄带声光可调滤波系统及其方法，系统包括依次设置的光源、光束准直系统、第一偏振分束器、声光滤波系统、第二偏振分束器、光反馈系统、光谱探测系统以及计算机控制与分析系统，计算机控制与分析系统还连接声光滤波系统，光源的光束依次通过光束准直系统、第一偏振分束器、声光滤波系统和第二偏振分束器，由第二偏振分束器偏折输出至光反馈系统，光反馈系统将光束再次依次通过第一偏振分束器、声光滤波系统和第二偏振分束器到达光谱探测系统，在计算机控制与分析系统的控制下进行光谱信息的采集、分析和存储。本发明的结构简单，成本低，控制方便。
The invention discloses a narrow-band acousto-optic tunable filter system with a large angular aperture and a method thereof. The system includes a light source, a beam collimation system, a first polarization beam splitter, an acousto-optic filter system, and a second polarization beam splitter arranged in sequence. , optical feedback system, spectral detection system, and computer control and analysis system. The computer control and analysis system is also connected to the acousto-optic filter system. The beam of the light source passes through the beam collimation system, the first polarizing beam splitter, the acousto-optic filter system and the Two polarization beam splitters, deflected by the second polarization beam splitter and output to the optical feedback system, the optical feedback system passes the light beam through the first polarization beam splitter, the acousto-optic filter system and the second polarization beam splitter to reach the spectrum detection The system collects, analyzes and stores spectral information under the control of the computer control and analysis system. The invention has simple structure, low cost and convenient control.
Description
Technical field
The present invention relates to Acousto-optic filtering field more particularly to a kind of adjustable filtering systems of narrowband acousto-optic with big angular aperture
And its method.
Background technique
Acousto-optic filtering technology is all widely used in fields such as spectroscopy, laser technology and optical imageries.Based on two
The acousto-optic tunable filter of tellurium oxide crystal has excellent acousto-optic performance, good near infrared region light passing performance in visible light
It is good, Acousto-optic filtering can be carried out under conllinear and non-colinear both of which, be the sound that Acousto-optic filtering field is most widely used
One of optical filter.
Acousto-optic filter important performance indexes based on tellurium dioxide acousto-optic crsytal first is that its angular aperture.Angular aperture determines
Acousto-optic filter is to the capacity gauge of signal light, and the light collecting light ability of the bigger acousto-optic filter of angular aperture is stronger, in Hyper spectral Imaging
Equal fields, the angular aperture size of acousto-optic filter are significant for the SNR influence of imaging.
For the determining acousto-optic filter based on tellurium dioxide acousto-optic crsytal, under the conditions of non-colinear acousto-optic interaction,
Angular aperture is with filtering signal center wavelength variation very little, and for determining filtering signal central wavelength, angular aperture is determined, can not
It adjusts.
Another key index of acousto-optic filter is its spectral resolution, in order to obtain high spectral resolution, can be used
Paper《Spectral resolution enhancement of acousto-optic tunable filter by
double-filtering》And patent（The adjustable Acousto-optic filtering imaging device of band logical based on bicrystal filtering）The two of middle proposition
Secondary acousto-optic filtering method.Acousto-optic filtering twice is carried out to signal light using cascade two acousto-optic filters, can be effectively reduced
The bandwidth of Acousto-optic filtering signal promotes spectral resolution.Meanwhile by the independent design to two acousto-optic filters, grade is utilized
Two acousto-optic filters of connection carry out the angular aperture of Acousto-optic filtering total angular aperture and single acousto-optic filter twice to signal light
Quite, guarantee that light collecting light ability does not decline while spectral resolution is promoted.But utilize cascade two Acousto-optic filterings
During device carries out Acousto-optic filtering twice to signal light, need individually to control two acousto-optic filters, it is complicated for operation.
In addition, due to needing to make two acousto-optic filters, system cost is high.
Therefore, paper《Efficient double-filtering with a single acousto-optic
tunable filter》Propose the method that Acousto-optic filtering twice is carried out to signal light using an acousto-optic filter.This method
The deficiency for carrying out Acousto-optic filtering method twice to signal using cascade two acousto-optic filters is overcome, is filtered using single acousto-optic
Wave device can carry out Acousto-optic filtering twice to signal light, and this method can be effectively reduced the bandwidth of filtering signal, promote spectrum point
Resolution.But since during Acousto-optic filtering twice, the polarization state of incident light is different, and the angular aperture of Acousto-optic filtering is in sky twice
Between be not overlapped, cause the angular aperture that Acousto-optic filtering is total to be twice obviously reduced, keep acousto-optic filter aobvious to the capacity gauge of signal light
Write decline.Therefore, how while promoting acousto-optic filter spectral resolution, obtaining big angular aperture is Acousto-optic filtering field
Concern.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of narrowband acousto-optic with big angular aperture is adjustable
Filtering system and its method, in conjunction with light feedback device, make Acousto-optic filtering process twice using single acousto-optic filter, light beam into
The incidence angle for entering acousto-optic filter is different, it is ensured that the angular aperture of second of Acousto-optic filtering process and first time Acousto-optic filtering process
Angular aperture is spatially overlapped, and Acousto-optic filtering process has big angular aperture twice, meanwhile, effectively reduce Acousto-optic filtering signal
Bandwidth improves spectral resolution.The system structure is simple, at low cost, easy to control.
The technical solution adopted by the present invention is that：
A kind of adjustable filtering system of narrowband acousto-optic with big angular aperture comprising the light source that sets gradually, passing through a collimating system,
First polarization beam apparatus, Acousto-optic filtering system, the second polarization beam apparatus, light feedback system, spectrum investigating system and computer
Control and analysis system, computer control are also connected with Acousto-optic filtering system with analysis system, and the light beam of light source passes sequentially through light beam
Colimated light system, the first polarization beam apparatus, Acousto-optic filtering system and the second polarization beam apparatus are exported by the second polarization beam apparatus deviation
To light feedback system, light beam is passed sequentially through the first polarization beam apparatus, Acousto-optic filtering system and second partially by light feedback system again
Vibration beam splitter reaches spectrum investigating system, and the acquisition of spectral information is carried out under computer control and the control of analysis system, is divided
Analysis and storage.
The light source is halogen lamp, and continuous spectrum is exported in visible light near infrared range.
The passing through a collimating system includes achromatic doublet lens group, double glued concavees lens groups and polarization
The light beam of piece, light source forms collimated light beam, collimated light beam warp after achromatic doublet lens group, double glued concavees lens groups
Polarizing film polarization light output is to the first polarization beam apparatus.
First polarization beam apparatus is wideband polarization cube beamsplitter, by random polarization light beam in visible-range
It is divided into the mutually perpendicular s polarised light in polarization direction and p-polarization light, s polarised light will be 90 degree deflected, and p-polarization light is along former incidence side
To transmission, the first polarization beam apparatus receives the linearly polarized light from passing through a collimating system, it is made all to pass through the along incident direction
One polarization beam apparatus, entering tone light filtering system of going forward side by side.
The Acousto-optic filtering system includes acousto-optic filter, radio frequency source and light barrier, acousto-optic filter and radio frequency source
Between connected by radio frequency line, light barrier is the aluminium alloy disk that handles through black anodizing of surface, and light barrier is located at acousto-optic
The rear end of filter, and receive the non-filtered light beam exported through filter.
Second polarization beam apparatus is wideband polarization cube beamsplitter, by random polarization light beam in visible-range
It is divided into the mutually perpendicular s polarised light in polarization direction and p-polarization light, s polarised light will be 90 degree deflected, and p-polarization light is along former incidence side
To transmission, the second polarization beam apparatus first time Acousto-optic filtering light beam of the reception from Acousto-optic filtering system is simultaneously inclined by its transmission direction
Enter light feedback system after 90 degree of folding.
The light feedback system includes 2 pieces of aluminium film broadband planar reflecting mirrors, the first time from the second polarization beam apparatus
Acousto-optic filtering light beam successively passes through 2 pieces of aluminium film broadband planar reflecting mirrors into the first polarization beam apparatus.
The spectrum investigating system is that fiber grating spectrograph includes fibre-optical probe, spectro-grating and high sensitivity
Ccd array, the spectral resolution in visible-range are 0.2nm, and fibre-optical probe is used to receive from the second polarization beam apparatus
Second of Acousto-optic filtering light beam and be sent into spectro-grating and be divided, ccd array, which receives to be divided, simultaneously measures second of acousto-optic filter
The intensity of different wave length signal light in glistening light of waves beam, the intensity data of light are sent into computer control and analysis system.
The computer control uses PC machine with analysis system, and PC machine is separately connected Acousto-optic filtering by USB connecting line
The radio frequency source and spectrum investigating system of system, radio frequency source control software, spectrum investigating system control software built in PC machine
And Data Analysis Software, PC machine is using radio frequency source control software, spectrum investigating system control with software respectively to radio frequency source, light
It composes detection system and carries out parameter adjustment and control；PC machine receives the spectroscopic data from spectrum investigating system and is analyzed by data
Software completes the analysis and storage of spectroscopic data, completes the adjustable filtering of big angular aperture narrowband acousto-optic.
The invention also discloses a kind of adjustable filtering method of narrowband acousto-optic with big angular aperture comprising following steps：
Step 201：System is opened, initialization Acousto-optic filtering system, spectrum investigating system and computer analysis and control system；
Step 202：Parameter adjustment is carried out to passing through a collimating system according to light source luminescent situation, carries out shrink beam to from light beam of light source
And collimation, guarantee that the linearly polarized light beam of passing through a collimating system output all transmits after the first polarization beam apparatus along incident direction；
Step 203：The frequency and power of radio frequency source output radiofrequency signal in Acousto-optic filtering system are set, and Acousto-optic filtering system is to next
First time Acousto-optic filtering is carried out from the linearly polarized light beam of the first polarization beam apparatus, adjusts the position of the light barrier of Acousto-optic filtering system
And receive the non-filtered light beam of the acousto-optic filter output through Acousto-optic filtering system；
Step 204：Second polarization beam apparatus receives the first time Acousto-optic filtering light beam from Acousto-optic filtering system and is transmitted
To light feedback system, first time Acousto-optic filtering light beam is fed back to the first polarization beam splitting by light feedback system for 90 degree of direction deviation outputs
Device, then the position of aluminium film broadband planar reflecting mirror and angle in light feedback system are controlled, change first time Acousto-optic filtering light beam again
The secondary angle for entering the first polarization beam apparatus, makes first time Acousto-optic filtering light beam after the first polarization beam apparatus deviation with optimum angle
Degree enters acousto-optic filter and carries out second of Acousto-optic filtering；
Step 205：First time Acousto-optic filtering light beam after the first polarization beam apparatus deviation enters acousto-optic filter with optimized incidence
Wave device carries out second of Acousto-optic filtering, the angular aperture of second of Acousto-optic filtering and the angular aperture space weight of first time Acousto-optic filtering
It closes；
Step 206：Second of Acousto-optic filtering light beam from acousto-optic filter is passed through into the second polarization beam apparatus along incident direction
Second polarization beam apparatus export to spectrum investigating system receive, adjust spectrum investigating system in fibre-optical probe position and to second
Secondary acousto-optic filtered beam is accurately received, and the gain of ccd array in spectrum investigating system is adjusted, and completes second of Acousto-optic filtering
The optimum measurement of light beam spectrum；
Step 207：Benefit is computerizedd control to be analyzed and processed with spectroscopic data of the analysis system to measurement, adjusts Acousto-optic filtering
The frequency of radio frequency source output signal in system realizes the continuous tuning of second of Acousto-optic filtering beam center wavelength；
Step 208：The Acousto-optic filtering spectrum result of acquisition is stored, the acousto-optic adjustable filter in narrowband with big angular aperture is terminated
Wave process, system are closed.
The invention adopts the above technical scheme, during accurately controlling second of Acousto-optic filtering, the filter of first time acousto-optic
Glistening light of waves beam enters the angle of acousto-optic filter after the first polarization beam apparatus deviation, makes the angular aperture of second of Acousto-optic filtering process
With the angular aperture space coincidence of first time Acousto-optic filtering process, big angular aperture is realized, this method filter stability is good, installation cost
Low, manipulation is simple, is suitble to various application occasions.
Detailed description of the invention
The present invention is described in further details below in conjunction with the drawings and specific embodiments；
Fig. 1 is a kind of structural schematic diagram of the adjustable filtering system of narrowband acousto-optic with big angular aperture of the present invention；
Fig. 2 is a kind of principle process schematic diagram of the adjustable filtering method of narrowband acousto-optic with big angular aperture of the present invention.
Specific embodiment
As shown in the figures 1 and 2, the invention discloses a kind of adjustable filtering system of narrowband acousto-optic with big angular aperture, packet
It is anti-to include the light source set gradually, passing through a collimating system, the first polarization beam apparatus, Acousto-optic filtering system, the second polarization beam apparatus, light
Feedback system, spectrum investigating system and computer control and analysis system, computer control are also connected with acousto-optic filter with analysis system
Wave system system, the light beam of light source pass sequentially through passing through a collimating system, the first polarization beam apparatus, Acousto-optic filtering system and the second polarization point
Beam device is exported by the second polarization beam apparatus deviation to light feedback system, and light beam is passed sequentially through first partially by light feedback system again
Shake beam splitter, Acousto-optic filtering system and the second polarization beam apparatus arrival spectrum investigating system, in computer control and analysis system
Control under carry out spectral information acquisition, analysis and storage.
The light source is halogen lamp, and continuous spectrum is exported in visible light near infrared range.
The passing through a collimating system includes achromatic doublet lens group, double glued concavees lens groups and polarization
The light beam of piece, light source forms collimated light beam, collimated light beam warp after achromatic doublet lens group, double glued concavees lens groups
Polarizing film polarization light output is to the first polarization beam apparatus.
First polarization beam apparatus is wideband polarization cube beamsplitter, by random polarization light beam in visible-range
It is divided into the mutually perpendicular s polarised light in polarization direction and p-polarization light, s polarised light will be 90 degree deflected, and p-polarization light is along former incidence side
To transmission, the first polarization beam apparatus receives the linearly polarized light from passing through a collimating system, it is made all to pass through the along incident direction
One polarization beam apparatus, entering tone light filtering system of going forward side by side.
The Acousto-optic filtering system includes acousto-optic filter, radio frequency source and light barrier, acousto-optic filter and radio frequency source
Between connected by radio frequency line, light barrier is the aluminium alloy disk that handles through black anodizing of surface, and light barrier is located at acousto-optic
The rear end of filter, and receive the non-filtered light beam exported through filter.
Second polarization beam apparatus is wideband polarization cube beamsplitter, by random polarization light beam in visible-range
It is divided into the mutually perpendicular s polarised light in polarization direction and p-polarization light, s polarised light will be 90 degree deflected, and p-polarization light is along former incidence side
To transmission, the second polarization beam apparatus first time Acousto-optic filtering light beam of the reception from Acousto-optic filtering system is simultaneously inclined by its transmission direction
Enter light feedback system after 90 degree of folding.
The light feedback system includes 2 pieces of aluminium film broadband planar reflecting mirrors, the first time from the second polarization beam apparatus
Acousto-optic filtering light beam successively passes through 2 pieces of aluminium film broadband planar reflecting mirrors into the first polarization beam apparatus.
The spectrum investigating system is that fiber grating spectrograph includes fibre-optical probe, spectro-grating and high sensitivity
Ccd array, the spectral resolution in visible-range are 0.2nm, and fibre-optical probe is used to receive from the second polarization beam apparatus
Second of Acousto-optic filtering light beam and be sent into spectro-grating and be divided, ccd array, which receives to be divided, simultaneously measures second of acousto-optic filter
The intensity of different wave length signal light in glistening light of waves beam, the intensity data of light are sent into computer control and analysis system.
The computer control uses PC machine with analysis system, and PC machine is separately connected Acousto-optic filtering by USB connecting line
The radio frequency source and spectrum investigating system of system, radio frequency source control software, spectrum investigating system control software built in PC machine
And Data Analysis Software, PC machine is using radio frequency source control software, spectrum investigating system control with software respectively to radio frequency source, light
It composes detection system and carries out parameter adjustment and control；PC machine receives the spectroscopic data from spectrum investigating system and is analyzed by data
Software completes the analysis and storage of spectroscopic data, completes the adjustable filtering of big angular aperture narrowband acousto-optic.
The invention also discloses a kind of adjustable filtering method of narrowband acousto-optic with big angular aperture comprising following steps：
Step 201：System is opened, initialization Acousto-optic filtering system, spectrum investigating system and computer analysis and control system；
Step 202：Parameter adjustment is carried out to passing through a collimating system according to light source luminescent situation, carries out shrink beam to from light beam of light source
And collimation, guarantee that the linearly polarized light beam of passing through a collimating system output all transmits after the first polarization beam apparatus along incident direction；
Step 203：The frequency and power of radio frequency source output radiofrequency signal in Acousto-optic filtering system are set, and Acousto-optic filtering system is to next
First time Acousto-optic filtering is carried out from the linearly polarized light beam of the first polarization beam apparatus, adjusts the position of the light barrier of Acousto-optic filtering system
And receive the non-filtered light beam of the acousto-optic filter output through Acousto-optic filtering system；
Step 204：Second polarization beam apparatus receives the first time Acousto-optic filtering light beam from Acousto-optic filtering system and is transmitted
To light feedback system, first time Acousto-optic filtering light beam is fed back to the first polarization beam splitting by light feedback system for 90 degree of direction deviation outputs
Device, then the position of aluminium film broadband planar reflecting mirror and angle in light feedback system are controlled, change first time Acousto-optic filtering light beam again
The secondary angle for entering the first polarization beam apparatus, makes first time Acousto-optic filtering light beam after the first polarization beam apparatus deviation with optimum angle
Degree enters acousto-optic filter and carries out second of Acousto-optic filtering；
Step 205：First time Acousto-optic filtering light beam after the first polarization beam apparatus deviation enters acousto-optic filter with optimized incidence
Wave device carries out second of Acousto-optic filtering, the angular aperture of second of Acousto-optic filtering and the angular aperture space weight of first time Acousto-optic filtering
It closes；
Step 206：Second of Acousto-optic filtering light beam from acousto-optic filter is passed through into the second polarization beam apparatus along incident direction
Second polarization beam apparatus export to spectrum investigating system receive, adjust spectrum investigating system in fibre-optical probe position and to second
Secondary acousto-optic filtered beam is accurately received, and the gain of ccd array in spectrum investigating system is adjusted, and completes second of Acousto-optic filtering
The optimum measurement of light beam spectrum；
Step 207：Benefit is computerizedd control to be analyzed and processed with spectroscopic data of the analysis system to measurement, adjusts Acousto-optic filtering
The frequency of radio frequency source output signal in system realizes the continuous tuning of second of Acousto-optic filtering beam center wavelength；
Step 208：The Acousto-optic filtering spectrum result of acquisition is stored, the acousto-optic adjustable filter in narrowband with big angular aperture is terminated
Wave process, system are closed.
Specifically, on the adjustable filtering method of big angular aperture narrowband acousto-optic, based on above-mentioned hardware device and software is controlled,
It is accomplished by the following way：Light beam from light source is received by passing through a collimating system, shrink beam and collimation are carried out to it, and using partially
Vibration piece is translated into linearly polarized light；Linearly polarized light from passing through a collimating system enters the first polarization beam apparatus and carries out polarization point
Beam adjusts the polarization direction of polarizing film in passing through a collimating system, guarantees the linearly polarized light from passing through a collimating system through first partially
It is all transmitted after vibration beam splitter along incident direction, into acousto-optic filter；Acousto-optic filter, which receives, comes from the first polarization beam apparatus
Linearly polarized light, carry out first time Acousto-optic filtering, due to acousto-optic interaction, the first time Acousto-optic filtering light that is exported through acousto-optic filter
Beam polarization direction is rotated by 90 °, into the second polarization beam apparatus；Second polarization beam apparatus receives first from acousto-optic filter
Secondary acousto-optic filtered beam, by 90 degree of its transmission direction deviation, into light feedback system；Light feedback system is received from the second polarization
The first time Acousto-optic filtering light beam of beam splitter, using two pieces of aluminium film broadband planar reflecting mirrors by first time Acousto-optic filtering beam Propagation
Direction deviation makes it into the first polarization beam apparatus；First polarization beam apparatus receives the first time acousto-optic from light feedback system
Filtered beam carries out second of Acousto-optic filtering into acousto-optic filter, it is wide to adjust second piece of aluminium film after its transmission direction deviation
Position and angle with plane mirror change the angle that first time Acousto-optic filtering light beam enters the first polarization beam apparatus, control
First time Acousto-optic filtering light beam enters the angle of acousto-optic filter after the first polarization beam apparatus deviation；It is closed using acousto-optic interaction
System, can determine that first time Acousto-optic filtering light beam enters the best angle of acousto-optic filter by theoretical calculation, guarantee above-mentioned
The angular aperture of Acousto-optic filtering process is spatially overlapped twice, realizes big angular aperture narrowband Acousto-optic filtering, in addition, since acousto-optic is made
With second of the Acousto-optic filtering light beam polarization direction exported through acousto-optic filter is rotated by 90 ° again；Second polarization beam apparatus connects
Second of Acousto-optic filtering light beam from acousto-optic filter is received, second of Acousto-optic filtering light beam passes through the second polarization along incident direction
Beam splitter reaches spectrum investigating system；Spectrum investigating system receives second of the Acousto-optic filtering light from the second polarization beam apparatus
Beam detects its spectral information；Computer control receives the spectral information from spectrum investigating system with analysis system and carries out to it
Analysis, and the parameter for accordingly adjusting radio frequency source and spectrum investigating system guarantees optimal spectrographic detection, finally to spectroscopic data
It is stored, completes the adjustable filtering of big angular aperture narrowband acousto-optic.
The invention adopts the above technical scheme, during accurately controlling second of Acousto-optic filtering, the filter of first time acousto-optic
Glistening light of waves beam enters the angle of acousto-optic filter after the first polarization beam apparatus deviation, makes the angular aperture of second of Acousto-optic filtering process
With the angular aperture space coincidence of first time Acousto-optic filtering process, big angular aperture is realized, this method filter stability is good, installation cost
Low, manipulation is simple, is suitble to various application occasions.
Claims (10)
1. a kind of adjustable filtering system of narrowband acousto-optic with big angular aperture, it is characterised in that：It include the light source set gradually,
Passing through a collimating system, the first polarization beam apparatus, Acousto-optic filtering system, the second polarization beam apparatus, light feedback system, spectrographic detection system
System and computer control and analysis system, computer control are also connected with Acousto-optic filtering system, the light beam of light source with analysis system
Passing through a collimating system, the first polarization beam apparatus, Acousto-optic filtering system and the second polarization beam apparatus are passed sequentially through, by the second polarization point
Beam device deviation is exported to light feedback system, and light beam is passed sequentially through the first polarization beam apparatus, Acousto-optic filtering by light feedback system again
System and the second polarization beam apparatus reach spectrum investigating system, carry out spectrum letter under computer control and the control of analysis system
Acquisition, analysis and the storage of breath.
2. a kind of adjustable filtering system of narrowband acousto-optic with big angular aperture according to claim 1, it is characterised in that：Institute
The light source stated is halogen lamp, and continuous spectrum is exported in visible light near infrared range.
3. a kind of adjustable filtering system of narrowband acousto-optic with big angular aperture according to claim 1, it is characterised in that：Institute
The passing through a collimating system stated includes achromatic doublet lens group, double glued concavees lens groups and polarizing film, the light of light source
Beam forms collimated light beam after achromatic doublet lens group, double glued concavees lens groups, and collimated light beam is exported through polarizing film
Linearly polarized light is to the first polarization beam apparatus.
4. a kind of adjustable filtering system of narrowband acousto-optic with big angular aperture according to claim 1, it is characterised in that：Institute
The first polarization beam apparatus stated is wideband polarization cube beamsplitter, and random polarization light beam is divided into polarization side in visible-range
To mutually perpendicular s polarised light and p-polarization light, s polarised light will be 90 degree deflected, and p-polarization light is transmitted along former incident direction, and first
Polarization beam apparatus receives the linearly polarized light from passing through a collimating system, it is made all to pass through the first polarization beam splitting along incident direction
Device, entering tone light filtering system of going forward side by side.
5. a kind of adjustable filtering system of narrowband acousto-optic with big angular aperture according to claim 1, it is characterised in that：Institute
The Acousto-optic filtering system stated includes acousto-optic filter, radio frequency source and light barrier, by penetrating between acousto-optic filter and radio frequency source
The connection of frequency line, light barrier is the aluminium alloy disk that surface is handled through black anodizing, after light barrier is located at acousto-optic filter
End, and receive the non-filtered light beam exported through filter.
6. a kind of adjustable filtering system of narrowband acousto-optic with big angular aperture according to claim 1, it is characterised in that：Institute
The second polarization beam apparatus stated is wideband polarization cube beamsplitter, and random polarization light beam is divided into polarization side in visible-range
To mutually perpendicular s polarised light and p-polarization light, s polarised light will be 90 degree deflected, and p-polarization light is transmitted along former incident direction, and second
Polarization beam apparatus receives first time Acousto-optic filtering light beam and will enter light feedback system after 90 degree of its transmission direction deviation.
7. a kind of adjustable filtering system of narrowband acousto-optic with big angular aperture according to claim 1, it is characterised in that：Institute
The light feedback system stated includes 2 pieces of aluminium film broadband planar reflecting mirrors, the first time Acousto-optic filtering light from the second polarization beam apparatus
Shu Yici enters the first polarization beam apparatus by 2 pieces of aluminium film broadband planar reflecting mirrors.
8. a kind of adjustable filtering system of narrowband acousto-optic with big angular aperture according to claim 1, it is characterised in that：Institute
The spectrum investigating system stated is that fiber grating spectrograph includes fibre-optical probe, spectro-grating and high-sensitive CCD array, can
Spectral resolution in light-exposed range is 0.2nm, and fibre-optical probe is used to receive second of acousto-optic from the second polarization beam apparatus
Filtered beam is simultaneously sent into spectro-grating and is divided, ccd array receive be divided simultaneously measure it is different in second of Acousto-optic filtering light beam
The intensity of wavelength signals light, the intensity data of light are sent into computer control and analysis system.
9. a kind of adjustable filtering system of narrowband acousto-optic with big angular aperture according to claim 1, it is characterised in that：Institute
With analysis system using PC machine, PC machine is separately connected the radio frequency of Acousto-optic filtering system by USB connecting line for the computer control stated
Source and spectrum investigating system, radio frequency source control software, spectrum investigating system control software and data point built in PC machine
Software is analysed, PC machine is using radio frequency source control software, spectrum investigating system control with software respectively to radio frequency source, spectrum investigating system
Carry out parameter adjustment and control；PC machine receives the spectroscopic data from spectrum investigating system and completes light by Data Analysis Software
The adjustable filtering of big angular aperture narrowband acousto-optic is completed in the analysis and storage of modal data.
10. a kind of adjustable filtering method of narrowband acousto-optic with big angular aperture, it is characterised in that：It includes the following steps：
Step 201：System is opened, initialization Acousto-optic filtering system, spectrum investigating system and computer analysis and control system；
Step 202：Parameter adjustment is carried out to passing through a collimating system according to light source luminescent situation, carries out shrink beam to from light beam of light source
And collimation, guarantee that the linearly polarized light beam of passing through a collimating system output all transmits after the first polarization beam apparatus along incident direction；
Step 203：The frequency and power of radio frequency source output radiofrequency signal in Acousto-optic filtering system are set, and Acousto-optic filtering system is to next
First time Acousto-optic filtering is carried out from the linearly polarized light beam of the first polarization beam apparatus, adjusts the position of the light barrier of Acousto-optic filtering system
And receive the non-filtered light beam of the acousto-optic filter output through Acousto-optic filtering system；
Step 204：Second polarization beam apparatus receives the first time Acousto-optic filtering light beam from Acousto-optic filtering system and is transmitted
To light feedback system, first time Acousto-optic filtering light beam is fed back to the first polarization beam splitting by light feedback system for 90 degree of direction deviation outputs
Device, then the position of aluminium film broadband planar reflecting mirror and angle in light feedback system are controlled, change first time Acousto-optic filtering light beam again
The secondary angle for entering the first polarization beam apparatus, makes first time Acousto-optic filtering light beam after the first polarization beam apparatus deviation with optimum angle
Degree enters acousto-optic filter and carries out second of Acousto-optic filtering；
Step 205：First time Acousto-optic filtering light beam after the first polarization beam apparatus deviation enters acousto-optic filter with optimized incidence
Wave device carries out second of Acousto-optic filtering, the angular aperture of second of Acousto-optic filtering and the angular aperture space weight of first time Acousto-optic filtering
It closes；
Step 206：Second of Acousto-optic filtering light beam from acousto-optic filter is passed through into the second polarization beam apparatus along incident direction
Second polarization beam apparatus export to spectrum investigating system receive, adjust spectrum investigating system in fibre-optical probe position and to second
Secondary acousto-optic filtered beam is accurately received, and the gain of ccd array in spectrum investigating system is adjusted, and completes second of Acousto-optic filtering
The optimum measurement of light beam spectrum；
Step 207：Benefit is computerizedd control to be analyzed and processed with spectroscopic data of the analysis system to measurement, adjusts Acousto-optic filtering
The frequency of radio frequency source output signal in system realizes the continuous tuning of second of Acousto-optic filtering beam center wavelength；
Step 208：The Acousto-optic filtering spectrum result of acquisition is stored, the acousto-optic adjustable filter in narrowband with big angular aperture is terminated
Wave process, system are closed.
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| US7405859B2 (en) * | 2005-01-27 | 2008-07-29 | Fujitsu Limited | Method and apparatus for selecting wavelength |
| CN103730826A (en) * | 2014-01-04 | 2014-04-16 | 天津奇谱光电技术有限公司 | Tunable laser system |
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Application publication date: 20181130 |