CN208704884U - A kind of dual-acousto-optic filtering unit secondary acousto-optic filter of injection frequency source driving - Google Patents
A kind of dual-acousto-optic filtering unit secondary acousto-optic filter of injection frequency source driving Download PDFInfo
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Abstract
The utility model discloses a kind of dual-acousto-optic filtering unit secondary acousto-optic filter of injection frequency source driving comprising radio frequency source, computer and sequentially connected wideband light source, beam collimator, the first Acousto-optic filtering component, the second acousto-optic filtering unit and spectrum detection instrument；Computer is separately connected the first Acousto-optic filtering component, the second acousto-optic filtering unit, radio frequency source and spectrum detection instrument, and radio frequency source is separately connected the first Acousto-optic filtering component and the second acousto-optic filtering unit；Beam collimator forms collimated light beam after the light of wideband light source is converged and collimated, first Acousto-optic filtering component carries out first time Acousto-optic filtering to collimated light beam, second acousto-optic filtering unit carries out second of Acousto-optic filtering to the light beam of first time Acousto-optic filtering, the light beam of second of Acousto-optic filtering is exported to spectrum detection instrument, and spectrum detection instrument acquisition spectral information is exported to computer.The utility model can control two Acousto-optic filtering components by a radio frequency source simultaneously, realize secondary acousto-optic filtering, improve spectral resolution.
Description
Technical field
The utility model relates to the dual-acousto-optic filtering units two that Acousto-optic filtering field more particularly to a kind of injection frequency source drive
Secondary acousto-optic filter.
Background technique
Acousto-optic filtering component is a kind of filtering device for being widely used in optical field.Its working principle is that: radiofrequency signal
Ultrasonic wave is generated in acousto-optic crsytal by energy converter, ultrasonic wave in transmission process, generates acousto-optic crsytal in acousto-optic crsytal
Periodic modulation.When broadband signal light passes through the acousto-optic crsytal by ultrasonic wave modulation, will meet with ultrasonic wave interaction
It determines that the signal light of wavelength will be diffracted when momentum matching condition, in broadband signal light, realizes narrow-band filtering.Also, filtering letter
The radio frequency signal frequency that number optical wavelength and acousto-optic crsytal are loaded corresponds, and filtering can be realized in the frequency for adjusting radiofrequency signal
The quick tuning of signal light wavelength.It is the Acousto-optic filtering component of acousto-material production using TeO2 crystal, because it is with light hole
Diameter is big, and acousto-optic interaction diffraction efficiency height etc. is many a little, is widely used.Spectral resolution is Acousto-optic filtering component
One of key technical index, spectral resolution is higher, stronger to the identification ability of fine spectrum, in Hyper spectral Imaging and spectrum
The fields such as analysis are of great significance to.Using the Acousto-optic filtering component that TeO2 crystal makes as acousto-material, although having
Above-mentioned plurality of advantages, but its spectral resolution is limited, generally several nanometers.Therefore, its spectrum point how is further promoted
Resolution is Acousto-optic filtering field concern.For this purpose, " secondary filtering improves acousto-optic tunable filter spectral resolution to paper
Research " and utility model patent (the adjustable Acousto-optic filtering imaging technique of bandwidth and device that are filtered based on bicrystal) propose and be based on
The narrowband acousto-optic tunable filter technology of two cascade Acousto-optic filtering components.The technology utilizes two sets of Acousto-optic filtering systems, carries out
Cascade Acousto-optic filtering twice, every suit Acousto-optic filtering system all include independent Acousto-optic filtering component and radio-frequency signal source.?
In secondary acousto-optic filtering, the radio frequency signal frequency loaded by controlling two Acousto-optic filtering components respectively makes two infrasonic sounds
The band logical of light filtering has overlay region, realizes the Acousto-optic filtering of narrowband, improves the spectral resolution of Acousto-optic filtering component.
Based on unusual acousto-optic interaction principle, after Acousto-optic filtering, the polarization direction of diffraction light will change.Namely
It says, if incident light is horizontal polarization, diffraction light if is to polarize vertically；If incident light is vertical polarization, diffraction light if is water
Flat polarization.Therefore, the polarization state of cascade Acousto-optic filtering process twice, incident light is different, leads to the acousto-optic of Acousto-optic filtering twice
Mechanism is also different.Under normal circumstances, in order to guarantee Acousto-optic filtering twice band logical have overlay region, two Acousto-optic filtering groups
The radio frequency signal frequency of part load is different.This means that two Acousto-optic filtering components can not be controlled simultaneously using a radio frequency source.
Therefore, it in practical secondary acousto-optic filtering, needs to carry out independent adjusting to two radio frequency sources, to control two radio frequencies
The difference on the frequency of signal realizes secondary acousto-optic filtering, complicated for operation, influences the efficiency of Acousto-optic filtering.In addition, two radio frequency sources make
With the cost for increasing device, the extensive use of the device and method is limited.The two of a radio frequency source is only needed if can invent
Secondary acousto-optic filter and method promote the efficiency of Acousto-optic filtering, it will help Acousto-optic filtering while reducing installation cost
The further genralrlization application of technology.
Summary of the invention
The purpose of this utility model is to provide a kind of dual-acousto-optic filtering unit secondary acousto-optic filtering of injection frequency source driving
Device.
The technical solution adopted in the utility model is:
A kind of dual-acousto-optic filtering unit secondary acousto-optic filter of injection frequency source driving comprising radio frequency source, computer
And sequentially connected wideband light source, beam collimator, the first Acousto-optic filtering component, the second acousto-optic filtering unit and spectrographic detection
Instrument；Computer is separately connected the first Acousto-optic filtering component, the second acousto-optic filtering unit, radio frequency source and spectrum detection instrument, radio frequency source
It is separately connected the first Acousto-optic filtering component and the second acousto-optic filtering unit；Wideband light source exports the light source of continuous spectrum, beam collimation
Device forms collimated light beam after the light source of continuous spectrum is converged and collimated, the first Acousto-optic filtering component is used to carry out collimated light beam the
Acousto-optic filtering, the second acousto-optic filtering unit are used to carry out second of Acousto-optic filtering to the light beam through first time Acousto-optic filtering,
Second of Acousto-optic filtering light beam is exported to spectrum detection instrument, and spectrum detection instrument acquisition spectral information is exported to computer, computer
Radio frequency source output setpoint frequency radiofrequency signal is controlled respectively to the first Acousto-optic filtering component and the second acousto-optic filtering unit, computer
Control the incident light angle of the first Acousto-optic filtering component and the second acousto-optic filtering unit；Light beam from wideband light source passes sequentially through
Beam collimator, the first Acousto-optic filtering component, the second acousto-optic filtering unit reach spectrum detection instrument, under control of the computer into
Acquisition, analysis and the storage of row spectral information form complete optical path connection.
The first Acousto-optic filtering component includes that the first acousto-optic filter, first angle adjusting turntable and first are light-blocking
Plate, the first acousto-optic filter are fixed on the upper surface that first angle adjusts turntable, and the first light barrier is surface through black anodic oxygen
Change the aluminium alloy disk of processing, receives and polarized in the non-filtered light beam and two beam filtered beams exported through the first acousto-optic filter
Direction be polarize vertically it is a branch of；
The second acousto-optic filtering unit includes that the second acousto-optic filter, second angle adjusting turntable and second are light-blocking
Plate, the second acousto-optic filter are fixed on the upper surface that second angle adjusts turntable, and the second light barrier is surface through black anodic oxygen
Change the aluminium alloy disk of processing, receives the non-filtered light beam exported through the second acousto-optic filter, the output of the second acousto-optic filter
Secondary acousto-optic filtered beam enters spectrum detection instrument.
Further, the wideband light source is halogen lamp, wideband light source company of output in visible light near infrared range
Continuous spectrum.
Further, the beam collimator includes achromatic doublet lens group and double glued concavees lens groups,
The light beam of wideband light source forms collimated light beam after beam collimator converges and collimates, and carries out the into the first Acousto-optic filtering component
Acousto-optic filtering.
Further, it is electrical motor driven that first angle, which adjusts turntable, and first angle adjusts turntable and passes through USB connecting line
It is connect with computer, the angle minimum resolution that first angle adjusts turntable is 5 points, and the lower surface that first angle adjusts turntable connects
Bracket is connect, facilitates and fixes first angle adjusting turntable, the rotation angle of turntable is adjusted by adjusting first angle, can accurately be controlled
The first acousto-optic filter is made with respect to the angle from beam collimator collimated light beam, guarantee from beam collimator collimated light beam with
Best incident light polar angle enters the first acousto-optic filter.
Further, it is electrical motor driven that second angle, which adjusts turntable, and second angle adjusts turntable and passes through USB connecting line
It is connect with computer, the angle minimum resolution that second angle adjusts turntable is 5 points, and the lower surface that second angle adjusts turntable connects
Bracket is connect, facilitates and fixes second angle adjusting turntable, the rotation angle of turntable is adjusted by adjusting second angle, can accurately be controlled
The second acousto-optic filter is made with respect to the angle from the first acousto-optic filter horizontal polarization light beam, guarantees to come from the first Acousto-optic filtering
The horizontal polarization light beam of device enters the second acousto-optic filter with best incident light polar angle.
Further, the frequency range of radio frequency source output radiofrequency signal is 60-200MHz, output power 0-
5W, radio frequency source are connect with the first Acousto-optic filtering component and the second acousto-optic filtering unit respectively by radio frequency line.
Further, the spectrum detection instrument is fiber grating spectrograph, and spectrum detection instrument includes fibre-optical probe, light splitting
Grating and high-sensitive CCD array, the spectral resolution in visible-range are 0.2nm, and fibre-optical probe, which is used to receive, to be come
It is the secondary acousto-optic filtered beam polarized vertically from the polarization direction of the second acousto-optic filtering unit, and is sent into spectro-grating and is divided
Light, ccd array, which receives, is divided and measures the intensity of different wave length signal light in secondary acousto-optic filtered beam, and by the intensity number of light
According to the subsequent computer of feeding.
Further, the computer uses PC machine, and PC machine is visited with radio frequency source and spectrum respectively by USB connecting line
Instrument connection is surveyed, PC machine adjusts turntable with first angle by serial ports and second angle adjusts turntable and connect, radio frequency source built in PC machine
Control software, spectrum detection instrument control software, first angle adjust turntable and second angle adjusts turning table control software
And Data Analysis Software, PC machine are adjusted using radio frequency source control software, spectrum detection instrument control software and first angle
Turntable and second angle adjust turning table control with software respectively to radio frequency source, spectrum detection instrument and first angle adjust turntable and
Second angle adjusts turntable and carries out parameter adjustment and control；PC machine receives the spectroscopic data from spectrum detection instrument and passes through data
Analyze analysis and storage that software completes spectroscopic data.
Further, the invention also discloses a kind of alliteration optical filter secondary acousto-optic filtering of injection frequency source driving
Method comprising following steps:
Step 201: open system, initialization spectrum detection instrument, the first Acousto-optic filtering component, the second acousto-optic filtering unit with
And computer；
Step 202: according to the position of wideband light source and luminous intensity, parameter regulation being carried out to beam collimator and is set
It sets, shrink beam and collimation is carried out to the light beam from wideband light source；
Step 203: driving injection frequency source to carry out secondary acousto-optic filtering under control of the computer；
Specifically includes the following steps:
Step 203-1: utilizing acousto-optic interaction relationship, and the vertical polarised light that first time Acousto-optic filtering is calculated and determined most preferably enters
The best incident light polar angle β of horizontal polarization light of optrode angle α and second of Acousto-optic filtering are penetrated, first angle is adjusted respectively and adjusts
Turntable and second angle adjust the corner of turntable, make the incident light polar angle α of first time Acousto-optic filtering process, second of acousto-optic filter
The incident light polar angle of wave process is β, is overlapped the band logical of Acousto-optic filtering twice, it is ensured that realizes secondary acousto-optic filtering；
Step 203-2: the position of the first light barrier of adjustment, to the non-diffracted light and two beams exported through the first acousto-optic filter
Polarization direction is that polarize vertically a branch of is collected in diffraction light；The position for adjusting the second light barrier is filtered to through the second acousto-optic
The non-diffracted light of wave device output is collected；
Step 203-3: the position of fibre-optical probe in spectrum detection instrument is adjusted, to two infrasonic sounds from the second acousto-optic filter
Light filtered beam is accurately received, and the gain of CCD in spectrum detection instrument is adjusted, and completes secondary acousto-optic filtered beam spectrum most
Good detection；
Step 204: being analyzed and processed using spectroscopic data of the computer to measurement, adjusted according to the spectrum parameter of acquisition
Radio frequency source exports the frequency and power parameter of radiofrequency signal, re-starts the first Acousto-optic filtering component and the of injection frequency source driving
The secondary acousto-optic of two Acousto-optic filtering components filters；
Step 205: the secondary acousto-optic filtering spectrum result of acquisition being stored, system is closed.
The utility model uses above technical scheme, and the difference of the device and traditional secondary Acousto-optic filtering device is, this
In device and method, it is only necessary to which a radio frequency source can control two Acousto-optic filtering components simultaneously, and guarantee Acousto-optic filtering twice
Band logical overlapping, realize secondary acousto-optic filtering, promoted Acousto-optic filtering spectrum resolution ratio.In order to guarantee Acousto-optic filtering band logical twice
Overlapping, can be calculated separately out using acousto-optic interaction relationship under determining radio frequency signal frequency, through the first Acousto-optic filtering group
The horizontal polarization optical wavelength and incident light polar angle relationship of part output, and the vertical polarised light exported through the second acousto-optic filtering unit
Wavelength and incident light polar angle relationship.Determine twice Acousto-optic filtering band logical be overlapped when, the incident light polar angle of first time Acousto-optic filtering and
The incident light polar angle optimum value of second of Acousto-optic filtering.Further, the production of two Acousto-optic filtering components is completed, it is ensured that twice
During Acousto-optic filtering, signal light is incident on two Acousto-optic filtering components perpendicular to acousto-optic crsytal surface with best incident light polar angle
Acousto-optic crsytal in.Using angular adjustment turntable, the angle of two Acousto-optic filtering components is controlled, guarantees Acousto-optic filtering process twice
Signal light is all incident in acousto-optic crsytal perpendicular to acousto-optic crsytal surface.The device only needs a radio frequency source, can control simultaneously
Two Acousto-optic filtering components realize secondary acousto-optic filtering, and the spectral resolution of secondary acousto-optic filtering is high, and device is simple, at low cost,
It is easy to control.
Detailed description of the invention
The utility model is described in further details below in conjunction with the drawings and specific embodiments；
Fig. 1 is a kind of structure of the dual-acousto-optic filtering unit secondary acousto-optic filter of injection frequency source driving of the utility model
Schematic diagram；
Fig. 2 is a kind of process of the dual-acousto-optic filtering unit secondary acousto-optic filtering method of injection frequency source driving of the utility model
Schematic diagram.
Specific embodiment
As shown in Figure 1 or 2, the utility model discloses a kind of two infrasonic sounds of dual-acousto-optic filtering unit of injection frequency source driving
Light filter comprising radio frequency source 105, computer 107 and sequentially connected wideband light source 101, beam collimator 102,
First Acousto-optic filtering component 103, the second acousto-optic filtering unit 104 and spectrum detection instrument 106；Computer 107 is separately connected first
Acousto-optic filtering component 103, the second acousto-optic filtering unit 104, radio frequency source 105 and spectrum detection instrument 106, radio frequency source 105 connect respectively
Connect the first Acousto-optic filtering component 103 and the second acousto-optic filtering unit 104；
Device fixed placement, the spectrum data gathering of Acousto-optic filtering process and analysis are completed by computer 107.
Light beam from wideband light source 101 passes sequentially through beam collimator 102, the first Acousto-optic filtering component 103, the rising tone
Light filtering unit 104 reaches spectrum detection instrument 106, and the acquisition of spectral information is carried out under the control of computer 107, analyzes and deposits
Storage forms complete optical path connection.
The wideband light source 101 is halogen lamp, and wideband light source 101 exports continuously in visible light near infrared range
Spectrum.
The beam collimator 102 includes achromatic doublet lens group and double glued concavees lens groups, broadband light
The light beam in source 101 forms collimated light beam after beam collimator 102 converges and collimates, into the first Acousto-optic filtering component 103 into
Row first time Acousto-optic filtering.
The first Acousto-optic filtering component 103 includes the first acousto-optic filter, first angle adjusting turntable and first
Light barrier, the first acousto-optic filter are fixed on the upper surface that first angle adjusts turntable, and the first light barrier is surface through black sun
The aluminium alloy disk of pole oxidation processes receives in the non-filtered light beam and two beam filtered beams exported through the first acousto-optic filter
Polarization direction is to polarize vertically a branch of, prevents from influencing subsequent signal spectrum and receives.
It is electrical motor driven that first angle, which adjusts turntable, and first angle adjusts turntable and passes through USB connecting line and computer
107 connections, the angle minimum resolution that first angle adjusts turntable is 5 points, and the lower surface that first angle adjusts turntable connects branch
Frame facilitates and fixes first angle adjusting turntable, the rotation angle of turntable is adjusted by adjusting first angle, accurately controls the
One acousto-optic filter guarantees to come from 102 collimated light beam of beam collimator with respect to the angle from 102 collimated light beam of beam collimator
Enter the first acousto-optic filter with best incident light polar angle.
The second acousto-optic filtering unit 104 includes the second acousto-optic filter, second angle adjusting turntable and second
Light barrier, the second acousto-optic filter are fixed on the upper surface that second angle adjusts turntable, and the second light barrier is surface through black sun
The aluminium alloy disk of pole oxidation processes, receives the non-filtered light beam exported through the second acousto-optic filter, and the second acousto-optic filter is defeated
Secondary acousto-optic filtered beam out enters spectrum detection instrument 106.
It is electrical motor driven that second angle, which adjusts turntable, and second angle adjusts turntable and passes through USB connecting line and computer
107 connections, the angle minimum resolution that second angle adjusts turntable is 5 points, and the lower surface that second angle adjusts turntable connects branch
Frame facilitates and fixes second angle adjusting turntable, the rotation angle of turntable is adjusted by adjusting second angle, accurately controls the
Two acousto-optic filters guarantee with respect to the angle from the first acousto-optic filter horizontal polarization light beam from the first acousto-optic filter
Horizontal polarization light beam enters the second acousto-optic filter with best incident light polar angle.
The frequency range that the radio frequency source 105 exports radiofrequency signal is 60-200MHz, output power 0-5W, radio frequency
Source 105 is connect with the first Acousto-optic filtering component 103 and the second acousto-optic filtering unit 104 respectively by radio frequency line.
The spectrum detection instrument 106 is fiber grating spectrograph, and spectrum detection instrument 106 includes fibre-optical probe, light splitting light
Grid and high-sensitive CCD array, the spectral resolution in visible-range are 0.2nm, and fibre-optical probe is used to receive to come from
The polarization direction of second acousto-optic filtering unit 104 is the secondary acousto-optic filtered beam polarized vertically, and is sent into spectro-grating progress
Light splitting, ccd array, which receives, is divided and measures the intensity of different wave length signal light in secondary acousto-optic filtered beam, and by the intensity of light
Data are sent into subsequent computer 107.
The computer 107 use PC machine, PC machine by USB connecting line respectively with radio frequency source 105 and spectrographic detection
Instrument 106 connects, and PC machine adjusts turntable with first angle by serial ports and second angle adjusts turntable and connect, radio frequency source built in PC machine
105 control softwares, the control of spectrum detection instrument 106 software, first angle adjusts turntable and second angle adjusts turning table control
With software and Data Analysis Software, PC machine using radio frequency source 105 control software, the control software of spectrum detection instrument 106 and
First angle adjust turntable and second angle adjust turning table control with software respectively to radio frequency source 105, spectrum detection instrument 106 and
First angle adjusts turntable and second angle adjusts turntable and carries out parameter adjustment and control；PC machine, which receives, comes from spectrum detection instrument
106 spectroscopic data and the analysis and storage that spectroscopic data is completed by Data Analysis Software.
As shown in Fig. 2, the invention also discloses a kind of alliteration optical filter secondary acousto-optic filters of injection frequency source driving
Wave method comprising following steps:
Step 201: open system initializes spectrum detection instrument 106, the first Acousto-optic filtering component 103, the second Acousto-optic filtering
Component 104 and computer 107；
Step 202: according to the position of wideband light source 101 and luminous intensity, parameter regulation being carried out to beam collimator 102
And setting, shrink beam and collimation are carried out to the light beam from wideband light source 101；
Step 203: driving injection frequency source 105 to carry out secondary acousto-optic filtering under the control of computer 107；
Specifically includes the following steps:
Step 203-1: utilizing acousto-optic interaction relationship, and the vertical polarised light that first time Acousto-optic filtering is calculated and determined most preferably enters
The best incident light polar angle β of horizontal polarization light of optrode angle α and second of Acousto-optic filtering are penetrated, first angle is adjusted respectively and adjusts
Turntable and second angle adjust the corner of turntable, make the incident light polar angle α of first time Acousto-optic filtering process, second of acousto-optic filter
The incident light polar angle of wave process is β, is overlapped the band logical of Acousto-optic filtering twice, it is ensured that realizes secondary acousto-optic filtering；
Step 203-2: the position of the first light barrier of adjustment, to the non-diffracted light and two beams exported through the first acousto-optic filter
Polarization direction is that polarize vertically a branch of is collected in diffraction light；The position for adjusting the second light barrier is filtered to through the second acousto-optic
The non-diffracted light of wave device output is collected；
Step 203-3: the position of fibre-optical probe in spectrum detection instrument 106 is adjusted, to two from the second acousto-optic filter
Secondary acousto-optic filtered beam is accurately received, and the gain of CCD in spectrum detection instrument 106 is adjusted, and completes secondary acousto-optic filtered beam
The optimal detection of spectrum；
Step 204: the spectroscopic data measured using 107 Duis of computer is analyzed and processed, according to the spectrum parameter of acquisition
Frequency and power parameter that radio frequency source 105 exports radiofrequency signal are adjusted, the first acousto-optic filter of the driving of injection frequency source 105 is re-started
The filtering of the secondary acousto-optic of wave component 103 and the second acousto-optic filtering unit 104；
Step 205: the secondary acousto-optic filtering spectrum result of acquisition being stored, system is closed.
The utility model uses above technical scheme, and the difference of the device and traditional secondary Acousto-optic filtering device is, this
In device and method, it is only necessary to which a radio frequency source 105 can control two Acousto-optic filtering components simultaneously, and guarantee that acousto-optic is filtered twice
The band logical of wave is overlapped, and is realized secondary acousto-optic filtering, is promoted Acousto-optic filtering spectrum resolution ratio.In order to guarantee Acousto-optic filtering band logical twice
Overlapping, can be calculated separately out under determining radio frequency signal frequency using acousto-optic interaction relationship, through the first Acousto-optic filtering
The horizontal polarization optical wavelength and incident light polar angle relationship that component 103 exports, and through the perpendicular of the second acousto-optic filtering unit 104 output
Straight polarised light wavelength and incident light polar angle relationship.When determining that Acousto-optic filtering band logical is overlapped twice, the incidence of first time Acousto-optic filtering
The incident light polar angle optimum value at optrode angle and second of Acousto-optic filtering.Further, the production of two Acousto-optic filtering components is completed,
During ensuring Acousto-optic filtering twice, signal light is incident on two acousto-optics perpendicular to acousto-optic crsytal surface with best incident light polar angle
In the acousto-optic crsytal of filtering unit.Using angular adjustment turntable, the angle of two Acousto-optic filtering components is controlled, guarantees acousto-optic twice
Filtering signal light is all incident in acousto-optic crsytal perpendicular to acousto-optic crsytal surface.The device only needs a radio frequency source 105, i.e.,
Two Acousto-optic filtering components can be controlled simultaneously, realize secondary acousto-optic filtering, and the spectral resolution of secondary acousto-optic filtering is high, device letter
It is single, it is at low cost, it is easy to control.
Claims (8)
1. a kind of dual-acousto-optic filtering unit secondary acousto-optic filter of injection frequency source driving, it is characterised in that: it includes radio frequency
Source, computer and sequentially connected wideband light source, beam collimator, the first Acousto-optic filtering component, the second acousto-optic filtering unit
And spectrum detection instrument；Computer is separately connected the first Acousto-optic filtering component, the second acousto-optic filtering unit, radio frequency source and spectrographic detection
Instrument, radio frequency source are separately connected the first Acousto-optic filtering component and the second acousto-optic filtering unit；Wideband light source exports the light source of continuous spectrum,
Beam collimator forms collimated light beam after the light source of continuous spectrum is converged and collimated, the first Acousto-optic filtering component is used for directional light
Shu Jinhang first time Acousto-optic filtering, the second acousto-optic filtering unit are used to carry out second of acousto-optic to the light beam of first time Acousto-optic filtering
Filtering, the light beam of second of Acousto-optic filtering are exported to spectrum detection instrument, and spectrum detection instrument acquisition spectral information is exported to computer,
Computer controls radio frequency source and exports setpoint frequency radiofrequency signal to the first Acousto-optic filtering component and the second acousto-optic filtering unit, calculates
The incident light angle of machine control the first Acousto-optic filtering component and the second acousto-optic filtering unit；
The first Acousto-optic filtering component adjusts turntable and the first light barrier including the first acousto-optic filter, first angle,
First acousto-optic filter be fixed on first angle adjust turntable upper surface, the first light barrier be surface through black anodizing at
The aluminium alloy disk of reason receives polarization direction in the non-filtered light beam and two beam filtered beams exported through the first acousto-optic filter
It is a branch of for what is polarized vertically；
The second acousto-optic filtering unit adjusts turntable and the second light barrier including the second acousto-optic filter, second angle,
Second acousto-optic filter be fixed on second angle adjust turntable upper surface, the second light barrier be surface through black anodizing at
The aluminium alloy disk of reason, receives the non-filtered light beam exported through the second acousto-optic filter, and the second acousto-optic filter exports secondary
Acousto-optic filtering light beam enters spectrum detection instrument.
2. a kind of dual-acousto-optic filtering unit secondary acousto-optic filter of injection frequency source driving according to claim 1,
Be characterized in that: the wideband light source is halogen lamp, and wideband light source exports continuous spectrum in visible light near infrared range.
3. a kind of dual-acousto-optic filtering unit secondary acousto-optic filter of injection frequency source driving according to claim 1,
Be characterized in that: the beam collimator includes achromatic doublet lens group and double glued concavees lens groups, wideband light source
Light beam collimated light beam is formed after beam collimator converges and collimates, into the first Acousto-optic filtering component carry out first time acousto-optic
Filtering.
4. a kind of dual-acousto-optic filtering unit secondary acousto-optic filter of injection frequency source driving according to claim 1,
Be characterized in that: it is electrical motor driven that first angle, which adjusts turntable, and first angle adjusts turntable and passes through USB connecting line and computer
Connection, the angle minimum resolution that first angle adjusts turntable is 5 points, and first angle adjusts the lower surface connecting bracket of turntable,
Facilitate and fix first angle adjusting turntable, the rotation angle of turntable is adjusted by adjusting first angle, accurately controls first
Acousto-optic filter guarantees from beam collimator collimated light beam with respect to the angle from beam collimator collimated light beam most preferably to enter
Optrode angle is penetrated into the first acousto-optic filter.
5. a kind of dual-acousto-optic filtering unit secondary acousto-optic filter of injection frequency source driving according to claim 1,
Be characterized in that: it is electrical motor driven that second angle, which adjusts turntable, and second angle adjusts turntable and passes through USB connecting line and computer
Connection, the angle minimum resolution that second angle adjusts turntable is 5 points, and second angle adjusts the lower surface connecting bracket of turntable,
Facilitate and fix second angle adjusting turntable, the rotation angle of turntable is adjusted by adjusting second angle, accurately controls second
Acousto-optic filter guarantees the water from the first acousto-optic filter with respect to the angle from the first acousto-optic filter horizontal polarization light beam
Flat light beam enters the second acousto-optic filter with best incident light polar angle.
6. a kind of dual-acousto-optic filtering unit secondary acousto-optic filter of injection frequency source driving according to claim 1,
Be characterized in that: the frequency range of the radio frequency source output radiofrequency signal is 60-200MHz, output power 0-5W, radio frequency source
It is connect respectively with the first Acousto-optic filtering component and the second acousto-optic filtering unit by radio frequency line.
7. a kind of dual-acousto-optic filtering unit secondary acousto-optic filter of injection frequency source driving according to claim 1,
Be characterized in that: the spectrum detection instrument be fiber grating spectrograph, spectrum detection instrument include fibre-optical probe, spectro-grating and
High-sensitive CCD array, the spectral resolution in visible-range are 0.2nm, and fibre-optical probe is used to receive from the rising tone
The polarization direction of light filtering unit is the secondary acousto-optic filtered beam polarized vertically, and is sent into spectro-grating and is divided, CCD gusts
Column receive the intensity for being divided and measuring different wave length signal light in secondary acousto-optic filtered beam, and will be after the intensity data of light feeding
Continuous computer.
8. a kind of dual-acousto-optic filtering unit secondary acousto-optic filter of injection frequency source driving according to claim 1,
Be characterized in that: the computer uses PC machine, and PC machine is connected with radio frequency source and spectrum detection instrument respectively by USB connecting line
It connects, PC machine adjusts turntable with first angle by serial ports and second angle adjusts turntable and connect, and PC machine controls radio frequency source, light respectively
It composes survey meter and first angle adjusts turntable and second angle adjusts turntable.
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| CN201821593049.2U CN208704884U (en) | 2018-09-28 | 2018-09-28 | A kind of dual-acousto-optic filtering unit secondary acousto-optic filter of injection frequency source driving |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109029729A (en) * | 2018-09-28 | 2018-12-18 | 福建师范大学 | A kind of the dual-acousto-optic filtering unit secondary acousto-optic filter and method of the driving of injection frequency source |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109029729A (en) * | 2018-09-28 | 2018-12-18 | 福建师范大学 | A kind of the dual-acousto-optic filtering unit secondary acousto-optic filter and method of the driving of injection frequency source |
| CN109029729B (en) * | 2018-09-28 | 2023-12-01 | 福建师范大学 | Dual acousto-optic filtering device and method for dual acousto-optic filtering assembly driven by single radio frequency source |
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