CN105387933B - A kind of broadband Brewster window regulating device and method - Google Patents
A kind of broadband Brewster window regulating device and method Download PDFInfo
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- CN105387933B CN105387933B CN201510981179.8A CN201510981179A CN105387933B CN 105387933 B CN105387933 B CN 105387933B CN 201510981179 A CN201510981179 A CN 201510981179A CN 105387933 B CN105387933 B CN 105387933B
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims description 21
- 238000012544 monitoring process Methods 0.000 claims abstract description 25
- 230000010287 polarization Effects 0.000 claims abstract description 17
- 230000003287 optical effect Effects 0.000 claims description 38
- 230000005855 radiation Effects 0.000 claims description 12
- 230000004044 response Effects 0.000 claims description 12
- 238000002310 reflectometry Methods 0.000 claims description 10
- 239000004744 fabric Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 3
- SBIBMFFZSBJNJF-UHFFFAOYSA-N selenium;zinc Chemical compound [Se]=[Zn] SBIBMFFZSBJNJF-UHFFFAOYSA-N 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 7
- 238000011160 research Methods 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- YNPNZTXNASCQKK-UHFFFAOYSA-N phenanthrene Chemical compound C1=CC=C2C3=CC=CC=C3C=CC2=C1 YNPNZTXNASCQKK-UHFFFAOYSA-N 0.000 description 2
- 229910052934 alunite Inorganic materials 0.000 description 1
- 239000010424 alunite Substances 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- KPZTWMNLAFDTGF-UHFFFAOYSA-D trialuminum;potassium;hexahydroxide;disulfate Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Al+3].[Al+3].[Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O KPZTWMNLAFDTGF-UHFFFAOYSA-D 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
-
- 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
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/0295—Constructional arrangements for removing other types of optical noise or for performing calibration
Abstract
The invention proposes a kind of broadband Brewster window regulating device, He-Ne laser generates the visible laser of 632.8nm；Laser power stability device is used to improve the power stability of laser；By the polarization regulating device that the polarizer and analyzer form, so that the polarization direction of incident light is the linearly polarized light for being parallel to incident interface；Incident linearly polarized light occurs to reflect and be transmitted when passing through Brewster window, and reflected light is monitored in real time by monitoring detector.The present invention can be adjusted in the ultraviolet high-precision to realization low temperature radiometer Brewster window in the wider wavelength band of far infrared, it especially realizes the accurate adjusting in ultraviolet, short-wave infrared, medium-wave infrared and far infrared band Brewster window for the first time at home, has filled up the domestic blank in surface technology research.
Description
Technical field
The present invention relates to the field of test technology, in particular to a kind of broadband Brewster window regulating device further relates to
A kind of broadband Brewster window adjusting method.
Background technique
Low temperature radiometer can realize the extremely low uncertainty measurement of light radiation in extremely wide spectral region, generally be used as light
Radiation benchmark is to realize that the high-precision calibration amount of light radiation passes.High performance photodetector is widely used as transmitting mark
Standard, magnitude tracing to low temperature radiometer, thus it is extremely important for realizing that the high accuracy Scaling of photodetector magnitude is traced to the source.
When carrying out photodetector light radiation scaling based on low temperature radiometer, in order to guarantee light beam to the maximum extent
Lossless transmission, realizes higher repdocutbility, and low temperature radiometer specially devises Brewster window in development.Utilize optics
The correlation of the reflection characteristic of window and laser beam polarization characteristic so that perpendicular to interface direction linear polarization incident light with
When brewster angle incidence, lossless transmission theoretically may be implemented.
In actual calibration process, it is seen that optical band mainly passes through observation or monitoring reflective optical methods are adjusted, due to can
Light-exposed wave band optical radiation measurement has mature device and measuring technique, and visible light spot has fabulous mentioned observable property.
Therefore, it is seen that the difficulty that the Brewster window of optical band low temperature radiometer is adjusted be not it is very big, window reflectivity can be with
Reach 10-5Magnitude, reproducibility are preferable.
However for ultraviolet and infrared band, since its observability, measurability are all very poor, especially infrared band,
It is difficult to observe under the auxiliary of ancillary equipment, and the influence vulnerable to external environment, therefore, the cloth of traditional visible light
This special window adjusting method of scholar is difficult to be adapted to these wave bands, adjusting be it is extremely difficult, adjusted result is difficult to assess, therefore uses
A kind of new method realizes that the high-precision adjusting of Brewster window is extremely necessary.
At present aiming at the problem that ultraviolet band and infrared band Brewster window effectively can not assess adjusting, generally adopt
The adjusting of Brewster window, increase appropriate therefore and bring uncertainty of measurement are to give up with two methods: one；
The second is defining by refractive index formula and Brewster's angle, the angle of corresponding Brewster window is calculated, use is visible
Light as reference light carry out angular adjustment, but this method operate it is extremely difficult.
Therefore, the prior art, which does not have, solves the ultraviolet Brewster window adjusting energy within the scope of far infrared broadband
Power can not have the good feature of high accuracy, operability in two kinds of solutions that ultraviolet and infrared band uses.
Summary of the invention
The present invention proposes a kind of broadband Brewster window regulating device and method, it is intended to from it is ultraviolet to far infrared this
In wider wavelength band, realizes the accurate adjusting of low temperature radiometer Brewster window, improve the high-precision of low temperature radiometer
Amount is passed and is provided safeguard.
The technical scheme of the present invention is realized as follows:
A kind of broadband Brewster window regulating device, He-Ne laser generate the visible laser of 632.8nm；Laser
Power stability device is used to improve the power stability of laser；By the polarization regulating device that the polarizer and analyzer form, make
The polarization direction for obtaining incident light is the linearly polarized light for being parallel to incident interface；Incident linearly polarized light is in Brewster window position
Reflection and transmission occurs, reflected light is monitored in real time by monitoring detector.
Optionally, the output signal of the monitoring detector passes through preamplifier enhanced processing.
Based on above-mentioned apparatus, the invention also provides a kind of broadband Brewster window high-precision adjusting methods, use
632.8nm laser is as reference laser light beam, when the laser of 632.8nm is incident on optical window from atmosphere, corresponding optics
Window refractive index is n0, corresponding Brewster's angle θ at this time is obtained using Brewster's angle defined formulaB0；For its all band
Any wavelength X1, the refractive index of corresponding optical window is n1, corresponding Brewster's angle is θB1；
When test, reference beam is incident on optical window, the optical power that measurement obtains incident light is P, and monitoring is visited
It surveys device to be placed in the optical path of the reflected beams, adjusts window, change the relative position of window and light beam, finely tune polarization state, so that
The light radiation that monitoring detection obtains is minimum, records response voltage value V at this time0, cloth when Window state at this time is 632.8nm
The state that this special window of scholar requires, incidence angle are equal to corresponding Brewster's angle θB0, there is θB0And n0, obtained by Fresnel formula
The polarized component reflectivity ρ in vertical incidence faces0, then pass through the response rate R of detector, obtain vertical polarisation component in reflected light
Optical power Ps0；
For wavelength X1, refractive index, which passes through to calibrate, to be obtained or is calculated by Cauchy Formula, value n1, corresponding
Brewster's angle be θB1；Assuming that the incidence angle of reference beam is equal to θB1When, the anti-of vertical component is obtained by Fresnel formula
Penetrate rate ρs1With the reflectivity ρ of parallel componentp1, then monitoring detector obtains the sum of the reflected light that light radiation is two components at this time,
Its value are as follows:
Under the premise of guaranteeing that incident light state is constant, the spatial position of Brewster window, observation monitoring detection are adjusted
The response of device exports, so that response output voltage is equal to V1When, it is λ that corresponding Window state, which is wavelength, at this time1When corresponding cloth
This special Window state of scholar.
Optionally, the optical power of reference light is made to be 1mW by optical path adjusting first, power unstability is less than
0.01%@30min.
Optionally, using Si as the ultraviolet optical window material near infrared band, ZnSe is as near-infrared to remote red
Outer optical window material.
The beneficial effects of the present invention are:
(1) realize that the ultraviolet Brewster window to far infrared broadband range is adjusted；
(2) it is calculated by digitlization surveillance technology and correlation theory, the state of Brewster window is defeated by monitoring
It shows out, improves existing Brewster window and adjust appraisal procedure, improve degree of regulation；
(3) due to the realization for digitizing monitoring assessment that Brewster window is adjusted, so that window, which is adjusted, to be had well
Repdocutbility, thus the present invention can provide technical support for state reproduction under the line of Brewster window.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the functional block diagram of Brewster window regulating device of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
When carrying out light spoke amount based on low temperature radiometer and passing, the optical window of low-temp radiating require with incident laser beam it
Between angle be Brewster's angle, which is known as Brewster window, which may be implemented perpendicular to interface direction
Linearly polarized light approximation lossless transmission, have fabulous repeatability.
At present in visible light wave range, Brewster window tune may be implemented by eye-observation or by detector technology
Effective assessment of section.However this kind of method in ultraviolet, infrared band and is not suitable for, there is no propose effective technology to solve both at home and abroad
The evaluation problem certainly adjusted in ultraviolet and infrared band Brewster window.
Present invention seek to address that the problem of ultraviolet high-precision to Brewster window within the scope of far infrared broadband is adjusted,
It is provided safeguard to improve the high-precision measurement biography of low temperature radiometer.
Fig. 1 show broadband Brewster window regulating device of the invention, and He-Ne laser generates 632.8nm's
Visible laser；Laser power stability device is used to improve the power stability of laser, so that the power stability of laser is less than
0.01%@30min；The polarization regulating device formed later by the polarizer and analyzer, so that the polarization direction of incident light is
It is parallel to the linearly polarized light at incident interface；In Brewster window position reflection and transmission, reflection occur for incident linearly polarized light
Light is monitored in real time by monitoring detector, in order to the state of evaluation window.
The output signal of monitoring detector is needed by preamplifier enhanced processing, because when window enters Brewster
When state, the reflected light that monitoring detector receives is very faint, and preamplifier is needed to realize amplification and the noise of useful signal
Inhibition, improve the signal-to-noise ratio of signal detection.
Adjusting of the Brewster window with respect to incident beam spatial position mainly pass through in Fig. 11 in Brewster window,
2,3 three knob rotations are accurate is adjusted.The device of the invention can satisfy the essence that this window of cloth scholar is realized within the scope of broadband
It really adjusts, very good solution is carrying out ultraviolet, the absolute spectrum experiment cloth of infrared band photodetector based on low temperature radiometer
This special window of scholar adjusts difficult problem, simultaneously because the assessment mode that the present invention adjusts Brewster window is by visual observation
Digitlization display is changed into, is reduced because of human factor bring error, the repdocutbility for having conventional method incomparable, because
This, can also realize restore under the line of Brewster window on the basis of the present invention, convenient for online lower completion window correlation skill
Art characteristic test research.
Based on above-mentioned apparatus, the invention also provides a kind of broadband Brewster window high-precision adjusting method, below
Method of the invention is described in detail.
For beam of laser when reflecting and reflecting on the interface of two media, the polarization state of laser is different, anti-on interface
Penetrate rate difference.When the angle of reflection light and refracted light is 90 degree, based on polarization known to Fresnel formula and the law of refraction
The direction component reflectivity parallel with the plane of incidence is 0, and corresponding incidence angle is Brewster's angle.If incident light is polarization side
, theoretically can be loss-free by optical window medium to the linearly polarized light parallel with the plane of incidence, corresponding reflected light is 0,
Transmitted light has best repeatability at this time.Brewster window is based on this principle development.Therefore, Brewster window
The assessment basis of adjusting is exactly based on the minimum value of monitoring the reflected beams or the maximum value of transmitted light beam.For the same window
Mouthful, different wave length corresponds to different refractive index, thus has different Brewster's angles, and the purpose that Brewster window is adjusted is both
Meet Brewster's angle.
The present invention uses 632.8nm laser as reference laser light beam, using Si as the ultraviolet light near infrared band
Learn window material, optical window material of the ZnSe as near-infrared to far infrared, below the present invention using Si as the optical window of material
It is illustrated for mouthful.
The laser of 632.8nm is incident on optical window from vacuum, and the refractive index of light is 1 in vacuum, if 632.8nm's swashs
Refractive index when light is incident on optical window is n0, using the available cloth scholar corresponding at this time of Brewster's angle defined formula this
Special angle θB0, i.e. incidence angle is θB0。
By laser power stability system and beam shaping system, so that reference laser light beam is high stability, height is inclined
The linearly polarized light of vibration degree, using high-precision ultraviolet Si trap detector as monitoring detector, monitoring request detector has
Fabulous stability, repeatability and lesser dark noise, the wavelength that can effectively measure 10nW is the light radiation of 632.8nm.
Monitoring detector is placed in Brewster window lower end, to monitor the intensity of reflected light.Wavelength X any for its all band1, right
The refractive index for the optical window answered is n1, corresponding Brewster's angle is θB1。
The optical power of reference laser light beam is made to be 1mW by optical path adjusting first, power unstability is less than 0.01%@
30min is parallel to the linear polarization polarization ratio with higher of the plane of incidence.
Reference laser light beam is incident on optical window when test, the optical power that measurement obtains incident light is P, will be fed back
Detector is placed in the optical path of the reflected beams, adjusts window, changes the relative position of window and light beam, appropriate fine tuning polarization shape
State, so that the light radiation that monitoring detection obtains is minimum, record obtains response voltage value V at this time0, Window state at this time is
The state that Brewster window requires when 632.8nm, incidence angle are equal to corresponding Brewster's angle θB0, there is θB0And n0, pass through phenanthrene
The polarized component reflectivity ρ in the available vertical incidence face of alunite ear formulas0, available then by the response rate R of detector
The optical power P of vertical polarisation component in reflected lights0。
For wavelength X1, refractive index can obtain or be calculated by Cauchy Formula, value n by calibration1,
Corresponding Brewster's angle is θB1.Assuming that the incidence angle of reference beam is equal to θB1When, it is available vertical by Fresnel formula
The reflectivity ρ of components1With the reflectivity ρ of parallel componentp1, then at this point, it is the anti-of two components that monitoring detector, which obtains light radiation,
Penetrate the sum of light.Its value are as follows:
Under the premise of guaranteeing that incident light state is constant, the spatial position of Brewster window, observation monitoring detection are adjusted
The response of device exports, so that response output voltage is equal to V1When, it is λ that corresponding Window state, which is wavelength, at this time1When, Si material
The corresponding Brewster window state of optical window.
The present invention can be ultraviolet to realization low temperature radiometer Brewster window in the wider wavelength band of far infrared
High-precision adjust, especially realize for the first time at home ultraviolet, short-wave infrared, medium-wave infrared and far infrared band cloth scholar this
The domestic blank in surface technology research has been filled up in the accurate adjusting of special window.
The present invention is monitored by theoretical calculation and digitlization, is realized the digitlization assessment of Brewster window adjusting, is made
It is more accurate to obtain adjusted result, provides necessary data for corresponding theory analysis.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of broadband Brewster window high-precision adjusting method, which is characterized in that He-Ne laser generates 632.8nm
Visible laser；Laser power stability device is used to improve the power stability of laser；It is formed by the polarizer and analyzer
Regulating device is polarized, so that the polarization direction of incident light is the linearly polarized light for being parallel to incident interface；Incident linearly polarized light exists
Reflection and transmission occur for Brewster window position, and reflected light is monitored in real time by monitoring detector；
Using 632.8nm laser as reference laser light beam, when the laser of 632.8nm is incident on optical window from atmosphere, light
Learning the corresponding refractive index of window is n0, corresponding Brewster's angle θ at this time is obtained using Brewster's angle defined formulaB0；For
Any wavelength X of its all band1, the refractive index of corresponding optical window is n1, corresponding Brewster's angle is θB1；
When test, reference laser light beam is incident on optical window, the optical power that measurement obtains incident light is P, and monitoring is visited
It surveys device to be placed in the optical path of the reflected beams, adjusts window, change the relative position of window and light beam, finely tune polarization state, so that
It monitors that the light radiation that detector obtains is minimum, records response voltage value V at this time0, when Window state at this time is 632.8nm
The state that Brewster window requires, incidence angle are equal to corresponding Brewster's angle θB0, there is θB0And n0, obtained by Fresnel formula
To the polarized component reflectivity ρ in vertical incidence faces0, then by the response rate R of monitoring detector, obtain vertically entering in reflected light
Penetrate the optical power P of face polarized components0；
For wavelength X1, refractive index, which passes through to calibrate, to be obtained or is calculated by Cauchy Formula, value n1, corresponding cloth
This special angle of scholar is θB1；Assuming that the incidence angle of reference beam is equal to θB0When, the reflectivity of vertical component is obtained by Fresnel formula
ρs1With the reflectivity ρ of parallel componentp1, then monitoring detector obtains the sum of the reflected light that light radiation is two components at this time；
Under the premise of guaranteeing that incident light state is constant, the spatial position of Brewster window is adjusted, observation monitoring detector
Response output, so that response output voltage is equal to V1When, it is λ that corresponding Window state, which is wavelength, at this time1When corresponding cloth scholar this
Special Window state.
2. a kind of broadband Brewster window high-precision adjusting method as described in claim 1, which is characterized in that the prison
Output signal depending on detector passes through preamplifier enhanced processing.
3. broadband Brewster window adjusting method as claimed in claim 1 or 2, which is characterized in that pass through optical path first
It adjusts so that the optical power of reference laser light beam is 1mW, power unstability is less than 0.01%@30min.
4. broadband Brewster window adjusting method as claimed in claim 1 or 2, which is characterized in that using Si as purple
The outer optical window material for arriving near infrared band, optical window material of the ZnSe as near-infrared to far infrared.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6955932B2 (en) * | 2017-08-25 | 2021-10-27 | 株式会社ディスコ | Laser beam profiler unit and laser processing equipment |
| CN109579982A (en) * | 2018-11-15 | 2019-04-05 | 中国电子科技集团公司第四十研究所 | A kind of Brewster window, Brewster window angle computation method and adjusting method |
| CN109580182B (en) * | 2018-12-18 | 2020-07-31 | 北京理工大学 | Method and device for measuring refractive index of curved optical element based on Brewster's law |
| CN109752858B (en) * | 2019-03-18 | 2021-05-18 | 贵州航天电子科技有限公司 | Line polarization laser emission optical device |
| CN110440915B (en) * | 2019-08-02 | 2021-04-30 | 中国电子科技集团公司第四十一研究所 | Compact remote detection spectrometer based on linear gradient filter light splitting |
| CN111048970B (en) * | 2019-11-20 | 2020-10-27 | 南京航空航天大学 | Polarization device based on double Brewster plates and adjusting method |
| CN116380256B (en) * | 2023-06-07 | 2023-08-01 | 长春理工大学 | Short-wave infrared full-polarization imaging device and method based on haze attenuation coefficient |
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| JPS63139317A (en) * | 1986-12-02 | 1988-06-11 | Fujitsu Ltd | Optical isolator |
| EP0836108A2 (en) * | 1996-10-11 | 1998-04-15 | Central Glass Company, Limited | Display system for projecting information to a driver of a car |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63139317A (en) * | 1986-12-02 | 1988-06-11 | Fujitsu Ltd | Optical isolator |
| EP0836108A2 (en) * | 1996-10-11 | 1998-04-15 | Central Glass Company, Limited | Display system for projecting information to a driver of a car |
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| Title |
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| 低温辐射计的结构优化方案设计;庞伟伟 等;《应用光学》;20150531;第36卷(第3期);第409-412页 |
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