CN206920028U - A kind of radiation spectrometer based on acousto-optic tunable filter - Google Patents
A kind of radiation spectrometer based on acousto-optic tunable filter Download PDFInfo
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- CN206920028U CN206920028U CN201720523272.9U CN201720523272U CN206920028U CN 206920028 U CN206920028 U CN 206920028U CN 201720523272 U CN201720523272 U CN 201720523272U CN 206920028 U CN206920028 U CN 206920028U
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Abstract
It the utility model is related to radiological measuring technical field,A kind of radiation spectrometer based on acousto-optic tunable filter,Including aperture diaphragm,Apochromatic lens,Optics camera bellows,The polarizer,Field stop,Collimation lens,Beam splitter,Level crossing I,Lens I,Photodiode,Transimpedance amplifier,Arrowband output signal,Lyot diaphragms,Acousto-optic tunable filter AOTF,Lens II,Level crossing II,Microwave generator,Ccd video camera,Light retroreflective system is formed by the lens II and level crossing II,The first time filters out light and reaches level crossing II by the lens II,And it is again introduced into after being reflected by the level crossing II by the lens II in the acousto-optic tunable filter AOTF,Its polarization direction is constant after second reflects and is formed and relative with the elementary beam direction of propagation filters out light for the second time.The utility model wavelengthtunable scope is wide, and low with outer luminous transparency, radiation detection capability is strong, high sensitivity；Enable to light loss smaller using light retroreflective system.
Description
Technical field
Radiological measuring technical field is the utility model is related to, particularly one kind is based on bilateral acousto-optic tunable filter
AOTF configurations, using specific light retroreflector, can effectively suppress diffraction secondary lobe so as to reduce the mechanical sensitivity of device, subtract
A kind of radiation spectrometer based on acousto-optic tunable filter of few device volume.
Background technology
Tunable radiation spectrometer has application in many scientific researches and industrial processes, and main element therein is adjustable
Humorous band logical optical filter can be used for the power distribution for scanning broadband non-uniform source aggregate, such as the various interference for having special film
Wave filter, the tunable liquid crystal filter based on Lyot-Ohman concepts, optical monochromator, acousto-optic tunable filter AOTF
Deng.Wherein, acousto-optic tunable filter AOTF is a kind of solid electrically adjusted band-pass filter, make use of the sound in anisotropic medium
Light principle, the momentum mismatch caused by angle change is compensated with the change of angle with double refraction amount, can be from incident light source
Middle selection, the light for transmiting single wavelength.The acousto-optic tunable filter AOTF sound optical medium of basic structure, electro-acoustic transducing
Device array and acoustical terminal three parts, when radiofrequency signal is added on transducer, motivates ultrasonic wave and be coupled in acousto-optic medium；
When natural light with certain incident angles to the acousto-optic medium when, due to acousto-optic interaction, incident light is diffracted into two beams
Orthogonal linearly polarized light, i.e. ordinary light (o light) and extraordinary ray (e light), change ultrasonic frequency, two polarised light wavelength are also by phase
It should change.The wavelength of transmitted light (one be filtered off is controlled by changing the radiofrequency signal acted on AOTF electro-acoustic transducers
Order diffraction light), carrier frequency is changed according to wave-length coverage, it becomes possible to obtain the spectrum analysis of gamut；By adjusting radio frequency
The amplitude of signal, it can also adjust transmitted light (filtering out light) intensity.The performance of spectroscopic analysis system is mainly by wavelength tuning range, light
Spectral resolution, secondary lobe determine that, due to the diffraction of light, the light in some ad-hoc location detected in spectroscopic analysis system exists
Frequency domain representation is the peak of a basic frequency, in addition also has some secondary small peaks in the peak both sides of basic frequency, here it is so-called
Secondary lobe.The radiation spectrometer based on AOTF of prior art is worked with single pass mode mostly, and its shortcoming is, due to there is stronger spread out
Secondary lobe presence is penetrated, the meeting with outer light influences the work of single-pass AOTF radiation spectrometers, and described one kind is based on acousto-optic tunable filter
Radiation spectrometer can solve this problem.
Utility model content
In order to solve the above problems, a kind of radiation spectrometer based on bilateral AOTF is the utility model is related to, for pyrometer
Amount is learned, and determines the thermokinetics temperature of high temperature blackbody in 1000 to 2500 degree Celsius ranges, the wave-length coverage of test is in visible ray
Scope 650nm to 1000nm is adjustable.
Technical scheme is used by the utility model：
A kind of radiation spectrometer based on acousto-optic tunable filter, mainly including aperture diaphragm, apochromatic lens,
Optics camera bellows, the polarizer, field stop, collimation lens, beam splitter, level crossing I, lens I, photodiode, transimpedance amplification
Device, arrowband output signal, Lyot diaphragms, acousto-optic tunable filter AOTF, lens II, level crossing II, microwave generator, CCD
Video camera, the apochromatic lens, the polarizer, field stop, collimation lens, beam splitter, level crossing I, lens I, photoelectricity two
Pole pipe, transimpedance amplifier, Lyot diaphragms, acousto-optic tunable filter AOTF, lens II, level crossing II, ccd video camera are located at
In the optics camera bellows and radiation spectrometer is formed, the radiation spectrometer entrance side has object under test, and the microwave generator connects
Meet the acousto-optic tunable filter AOTF, 30 millimeters of the aperture diaphragm diameter and at the Optical Dark Solitary Pulse tank inlet, institute
1 millimeter of field stop diameter is stated, and then the region that can determine to be detected on the object under test is relative to the radiation spectrometer
Solid angle Ω, the polarizer is used to control the direction that the linear optics of incident light polarize, and the ccd video camera is for collecting
The p-polarization light reflected by the polarizer, can in the acousto-optic to be imaged to the region being detected on the object under test
The Lyot diaphragms of tuning filtering device AOTF leading flank are used to filter the modulation transfer function of radiation spectrometer, to subtract
Veiling glare in few device；The light that the object under test is sent passes through the aperture diaphragm, apochromatic lens, is polarized successively
Device, field stop, collimation lens, beam splitter, Lyot diaphragms reach the acousto-optic tunable filter AOTF and are refracted to be formed
Light injection is filtered out for the first time.
Light retroreflective system is formed by the lens II and level crossing II, the first time filters out light and arrived by the lens II
The acousto-optic tunable filter is again introduced into by the lens II after being reflected up to level crossing II and by the level crossing II
In AOTF, its polarization direction is constant after second reflects and is formed and relative with the elementary beam direction of propagation filters out for the second time
Light, the light that filters out for the second time reach the beam splitter by the Lyot diaphragms, and the beam splitter is used to cause about 20%
Light is filtered out for the second time to deflect, and is converted into voltage letter into the photodiode through the level crossing I and lens I
Number, and obtain the arrowband output signal after amplifying by the transimpedance amplifier.
The aperture diaphragm is with the object under test apart from about 900 millimeters；Can to wave-length coverage in 650nm extremely
1000nm spectrum is acquired and filtered；Class hour is measured for high temperature, can determine high in 1000 to 2500 degree Celsius ranges
The thermokinetics temperature of warm black matrix.
Use the experimental procedure of radiation spectrometer based on acousto-optic tunable filter a kind of for：
The radiation spectrometer is placed in ad-hoc location by one, to cause the aperture diaphragm and object under test distance about 900
Millimeter；
Two, use the picture in the detected region on ccd video camera observation object under test, only have on the object under test
The luminous energy that detected region is sent enters in the radiation spectrometer, and the area for being detected region is A；
Three, are detected by the movement radiation spectrometer to the different zones on the object under test；
Four, enter the light of the radiation spectrometer, twice after the acousto-optic tunable filter AOTF, into described
Photodiode, it is converted into voltage signal and exports the arrowband output signal after being amplified by the transimpedance amplifier, export
VoltageWherein, G is transimpedance amplifier gain, and B is to enter institute
The luminous flux for stating photodiode represents wavelength, T relative to the ratio for the luminous flux for entering the aperture diaphragm, λ2(λ, ν0) be
Transmission coefficients of the acousto-optic tunable filter AOTF of bilateral configuration under some frequency, SPD(λ) is the pole of photoelectricity two
The spectral response of pipe,(λ) is to input pharosage and its spectral radiance L after radiation spectrometer is entered depending on light source
(λ),(λ)=Ω AL (λ)；
The microwave frequency that microwave generator described in five, exports is in some fixed value, the acousto-optic tunable filter
AOTF filters out the light of some narrowband frequency range in light beam, changes the microwave generator output in a manner of scanning
Microwave frequency, to regulate and control the acousto-optic tunable filter AOTF scannings filtering narrow band light, and the object under test is obtained in ripple
Long scope 650nm to 1000nm radiation spectrum, and analyze with this thermodynamic temperature of object under test.
The beneficial effects of the utility model are：
The utility model wavelengthtunable scope is wide, and low with outer luminous transparency, radiation detection capability is strong, high sensitivity；Use
Light retroreflective system enables to light loss smaller.
Brief description of the drawings
Further illustrated with reference to figure of the present utility model：
Fig. 1 is the utility model schematic diagram.
In figure, 1. light sources, 2. aperture diaphragms, 3. apochromatic lenses, 4. optics camera bellows, 5. polarizers, 6. field stops,
7. collimation lens, 8. beam splitters, 9. level crossing I, 10. lens I, 11. photodiodes, 12. transimpedance amplifiers, 13. arrowbands
Output signal, 14.Lyot diaphragms, 15. acousto-optic tunable filter AOTF, 16. lens II, 17. level crossing II, 18. microwaves hair
Raw device, 19.CCD video cameras.
Embodiment
If Fig. 1 is the utility model schematic diagram, mainly includes aperture diaphragm 2, apochromatic lens 3, optics camera bellows 4, rise
Inclined device 5, field stop 6, collimation lens 7, beam splitter 8, level crossing I9, lens I10, photodiode 11, transimpedance amplifier
12nd, arrowband output signal 13, Lyot diaphragms 14, acousto-optic tunable filter AOTF15, lens II16, level crossing II17, microwave
Generator 18, ccd video camera 19 are the apochromatic lens 3, the polarizer 5, field stop 6, collimation lens 7, beam splitter 8, flat
Face mirror I9, lens I10, photodiode 11, transimpedance amplifier 12, Lyot diaphragms 14, acousto-optic tunable filter AOTF15,
Lens II16, level crossing II17, ccd video camera 19 are located in the optics camera bellows 4 and form radiation spectrometer, the radiation spectrometer
Entrance side has object under test 1, and the microwave generator 18 connects the acousto-optic tunable filter AOTF15, the aperture light
Late 30 millimeters of 2 diameter and it is located at the porch of optics camera bellows 4,1 millimeter of 6 diameter of field stop, and then institute can be determined
The region being detected on object under test 1 is stated relative to the solid angle Ω of the radiation spectrometer, the polarizer 5 is for controlling incidence
The direction of the linear optics polarization of light, the ccd video camera 19 is used to collect the p-polarization light reflected by the polarizer 5, with right
The region being detected on the object under test 1 is imaged, in the institute of the leading flank of the acousto-optic tunable filter AOTF15
State Lyot diaphragms 14 to be used to filter the modulation transfer function of radiation spectrometer, to reduce the veiling glare in device；It is described to treat
Survey the light that object 1 is sent and pass through the aperture diaphragm 2, apochromatic lens 3, the polarizer 5, field stop 6, collimation lens successively
7th, beam splitter 8, Lyot diaphragms 14, which reach the acousto-optic tunable filter AOTF15 and being refracted and formed, filters out light for the first time and penetrates
Go out.
Light retroreflective system is formed by the lens II16 and level crossing II17, the first time filters out light and passes through the lens
II16 reaches level crossing II17 and is again introduced into the acousto-optic by the lens II16 after being reflected by the level crossing II17 can
In tuning filtering device AOTF15, its polarization direction is constant after second reflects and is formed relative with the elementary beam direction of propagation
Light is filtered out for the second time, and the light that filters out for the second time reaches the beam splitter 8 by the Lyot diaphragms 14, and the beam splitter 8 is used
In causing about 20% light that filters out for the second time to deflect, and enter the pole of photoelectricity two through the level crossing I9 and lens I10
Pipe 11 is converted into voltage signal, and obtains the arrowband output signal 13 after amplifying by the transimpedance amplifier 12.
The aperture diaphragm 2 is with the object under test 1 apart from about 900 millimeters；Can to wave-length coverage in 650nm extremely
1000nm spectrum is acquired and filtered；Class hour is measured for high temperature, can determine high in 1000 to 2500 degree Celsius ranges
The thermokinetics temperature of warm black matrix.
Claims (4)
1. a kind of radiation spectrometer based on acousto-optic tunable filter, mainly including aperture diaphragm (2), apochromatic lens (3),
Optics camera bellows (4), the polarizer (5), field stop (6), collimation lens (7), beam splitter (8), level crossing I (9), lens I (10),
Photodiode (11), transimpedance amplifier (12), arrowband output signal (13), Lyot diaphragms (14), acousto-optic tunable filtering
Device AOTF (15), lens II (16), level crossing II (17), microwave generator (18), ccd video camera (19), the apochromatism
Lens (3), the polarizer (5), field stop (6), collimation lens (7), beam splitter (8), level crossing I (9), lens I (10), photoelectricity
Diode (11), transimpedance amplifier (12), Lyot diaphragms (14), acousto-optic tunable filter AOTF (15), lens II (16),
Level crossing II (17), ccd video camera (19) are located in the optics camera bellows (4) and form radiation spectrometer, and the radiation spectrometer enters
Mouth side has object under test (1), and the microwave generator (18) connects the acousto-optic tunable filter AOTF (15), the hole
30 millimeters of footpath diaphragm (2) diameter and it is located at optics camera bellows (4) porch, 1 millimeter of field stop (6) diameter, and then
The region that can determine to be detected on the object under test (1) is relative to the solid angle Ω of the radiation spectrometer, the polarizer
(5) it is used to control the direction that the linear optics of incident light polarizes, the ccd video camera (19) is used to collect by the polarizer
(5) the p-polarization light of refraction, to be imaged to the region being detected on the object under test (1), filtered in the acousto-optic tunable
The Lyot diaphragms (14) of ripple device AOTF (15) leading flank are used to filter the modulation transfer function of radiation spectrometer, with
Reduce the veiling glare in device；The light that the object under test (1) sends is saturating by the aperture diaphragm (2), apochromatism successively
Mirror (3), the polarizer (5), field stop (6), collimation lens (7), beam splitter (8), Lyot diaphragms (14) the arrival acousto-optic can
Tuning filtering device AOTF (15) and being refracted to be formed filters out light injection for the first time,
It is characterized in that：Light retroreflective system is formed by the lens II (16) and level crossing II (17), the first time filters out light and led to
Cross after the lens II (16) reaches level crossing II (17) and reflected by the level crossing II (17) by the lens II (16)
Be again introduced into the acousto-optic tunable filter AOTF (15), after second reflects its polarization direction it is constant and formed with
The elementary beam direction of propagation it is relative filter out light for the second time, it is described to filter out for the second time described in light reached by the Lyot diaphragms (14)
Beam splitter (8), the beam splitter (8) are used to about 20% light that filters out for the second time is deflected, and through the level crossing I
(9) enter the photodiode (11) with lens I (10) and be converted into voltage signal, and pass through the transimpedance amplifier
(12) the arrowband output signal (13) is obtained after amplifying.
2. a kind of radiation spectrometer based on acousto-optic tunable filter according to claim 1, it is characterized in that：The aperture
Diaphragm (2) is with the object under test (1) apart from about 900 millimeters.
3. a kind of radiation spectrometer based on acousto-optic tunable filter according to claim 1, it is characterized in that：Can be to ripple
Long scope is acquired and filtered in 650nm to 1000nm spectrum.
4. a kind of radiation spectrometer based on acousto-optic tunable filter according to claim 1, it is characterized in that：For high temperature
During meterological, the thermokinetics temperature of high temperature blackbody in 1000 to 2500 degree Celsius ranges can determine.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107024282A (en) * | 2017-05-04 | 2017-08-08 | 金华职业技术学院 | A kind of radiation spectrometer based on acousto-optic tunable filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107024282A (en) * | 2017-05-04 | 2017-08-08 | 金华职业技术学院 | A kind of radiation spectrometer based on acousto-optic tunable filter |
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