CN105387933A - Broadband Brewster window adjusting device and method - Google Patents
Broadband Brewster window adjusting device and method Download PDFInfo
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- CN105387933A CN105387933A CN201510981179.8A CN201510981179A CN105387933A CN 105387933 A CN105387933 A CN 105387933A CN 201510981179 A CN201510981179 A CN 201510981179A CN 105387933 A CN105387933 A CN 105387933A
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- 238000000034 method Methods 0.000 title claims description 23
- 230000010287 polarization Effects 0.000 claims abstract description 19
- 238000012544 monitoring process Methods 0.000 claims abstract description 12
- 230000003287 optical effect Effects 0.000 claims description 39
- 230000001105 regulatory effect Effects 0.000 claims description 17
- 230000005855 radiation Effects 0.000 claims description 12
- 238000002310 reflectometry Methods 0.000 claims description 12
- 230000004044 response Effects 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 4
- 230000004043 responsiveness Effects 0.000 claims description 3
- SBIBMFFZSBJNJF-UHFFFAOYSA-N selenium;zinc Chemical compound [Se]=[Zn] SBIBMFFZSBJNJF-UHFFFAOYSA-N 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 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
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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Classifications
-
- 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 brings forward a broadband Brewster window adjusting device. A He-Ne laser generates 632.8nm visible laser. A laser power stabilizing device is used for improving the power stability of laser. Through a polarization adjusting apparatus formed by a polarizer and a polarization analyzer, incident light in terms of polarization direction is made to be linearly polarized light parallel to an incident interface. The incident linearly polarized light reflects and transmits by passing through a Brewster window, and reflected light is monitored in real time by a monitoring detector. High-precision adjustment in a low-temperature radiometer Brewster window is achieved within the wide wave band scope ranging from UV light to far-infrared light. In particular, accurate adjustment in UV, short-wave infrared, medium-wave infrared and far-infrared wave band Brewster windows is achieved for the first time in China, which filling the gap in this technical research in China.
Description
Technical field
The present invention relates to technical field of measurement and test, particularly a kind of broadband Brewster window regulating device, also relate to a kind of broadband Brewster window control method.
Background technology
Low temperature radiometer can realize the extremely low uncertainty of optical radiation and measure in extremely wide spectral range, generally passes in order to the high-precision calibration amount realizing optical radiation as optical radiation benchmark.High performance photodetector is widely used as Transfer Standards, and its magnitude tracing is to low temperature radiometer, and thus realizing the high precision calibration of photodetector value, to trace to the source be extremely important.
When carrying out photodetector light radiation scaling based on low temperature radiometer, in order to ensure the lossless transmission of light beam to greatest extent, realize higher repdocutbility, low temperature radiometer specially devises Brewster window in development.Utilize the reflection characteristic of optical window and the mutual relationship of laser beam polarization characteristic, when making linear polarization incident light perpendicular to direction, interface with brewster angle incidence, can lossless transmission be realized in theory.
In actual calibration process, visible light wave range regulates mainly through observing or monitor reflective optical methods, and because visible light wave range optical radiation measurement possesses ripe device and measuring technique, and visible light spot has fabulous mentioned observable property.Therefore, the difficulty that the Brewster window of visible light wave range low temperature radiometer regulates not is very large, and its window reflectivity can reach 10
-5magnitude, reproducibility is better.
But for ultraviolet and infrared band, because its observability, measurability are all very poor, especially infrared band, even if utility appliance auxiliary under be also difficult to observe, and be vulnerable to the impact of external environment, therefore, the Brewster window control method of tradition visible ray is difficult to be adapted to these wave bands, adjustment is extremely difficult, regulates result to be difficult to assessment, and it is extremely necessary that the high precision therefore adopting a kind of new method to realize Brewster window regulates.
At present for cannot the problem that regulates of Efficient Evaluation at ultraviolet band and infrared band Brewster window, generally have employed two kinds of methods: the first abandons the adjustment of Brewster window, the uncertainty of measurement that therefore suitable increase brings; It two is by refractive index formula and Brewster angle definition, calculates the angle of corresponding Brewster window, carries out angular adjustment with visible ray as with reference to light, the very difficulty but this method operates.
Therefore, prior art does not possess and solves ultraviolet to the Brewster window regulating power within the scope of far infrared broadband, can not possess pin-point accuracy, feature that operability is good in two kinds of solutions of ultraviolet and infrared band employing.
Summary of the invention
The present invention proposes a kind of broadband Brewster window regulating device and method, is intended in this wider wavelength band, realize the fine adjustment of low temperature radiometer Brewster window from ultraviolet to far infrared, and the high-precision tolerance biography improving low temperature radiometer provides safeguard.
Technical scheme of the present invention is achieved in that
A kind of broadband Brewster window regulating device, He-Ne laser instrument produces the visible laser of 632.8nm; Laser power stability device is for improving the power stability of laser; Through the polarization regulating device that the polarizer and analyzer form, the polarization direction of incident light is made to be the linearly polarized light being parallel to incident interface; There is reflection and transmission in Brewster window position in incident linearly polarized light, reflected light is by monitoring detector real time monitoring.
Alternatively, the output signal of described supervision detector amplifies process through prime amplifier.
Based on said apparatus, the invention allows for a kind of broadband Brewster window high precision control method, adopt 632.8nm laser as reference laser beam, when the laser of 632.8nm incides optical window from air, corresponding optical window refractive index is n
0, utilize Brewster angle defined formula to obtain now corresponding Brewster angle θ
b0; For any wavelength X of its all band
1, the refractive index of corresponding optical window is n
1, corresponding Brewster angle is θ
b1;
During test, incide on optical window with reference to light beam, measuring the luminous power obtaining incident light is P, supervision detector is placed in the light path of folded light beam, regulate window, change the relative position of window and light beam, fine setting polarization state, make to monitor that the optical radiation that detection obtains is minimum, record response voltage value V now
0, the state that when Window state is now 632.8nm, Brewster window requires, incident angle equals corresponding Brewster angle θ
b0, have θ
b0and n
0, the polarized component reflectivity ρ in vertical incidence face is obtained by Fresnel formula
s0, then by the responsiveness R of detector, obtain the luminous power P of vertical polarisation component in reflected light
s0;
For wavelength X
1, its refractive index is obtained by calibration or is calculated by Cauchy Formula, and its value is n
1, corresponding Brewster angle is θ
b1; The incident angle of hypothetical reference light beam equals θ
b1time, the reflectivity ρ of vertical component is obtained by Fresnel formula
s1with the reflectivity ρ of parallel component
p1, then now monitor that detector obtains the reflected light sum that optical radiation is two components, its value is:
Ensureing, under the prerequisite that incident light state is constant, to regulate the locus of Brewster window, observing and monitoring that the response of detector exports, make response output voltage equal V
1time, it is λ that now corresponding Window state is wavelength
1time corresponding Brewster window state.
Alternatively, first make the luminous power of reference light be 1mW by optical path adjusting, power instability is less than 0.01%30min.
Alternatively, adopt Si as the optical window material of ultraviolet to near-infrared band, ZnSe as near infrared to far optical window material.
The invention has the beneficial effects as follows:
(1) realize ultraviolet to regulate to the Brewster window of far infrared broadband scope;
(2) by digitizing surveillance technology, and correlation theory calculates, and by the state of Brewster window by monitoring that output shows, improving existing Brewster window and regulating appraisal procedure, improve degree of regulation;
(3) digitizing regulated due to Brewster window monitors the realization of assessment, window is regulated and has good repdocutbility, and thus the present invention can provide technical support for state reproduction under the line of Brewster window.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the theory diagram of Brewster window regulating device of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
When carrying out light spoke amount based on low temperature radiometer and passing, the optical window of low-temp radiating requires that the angle between incident laser beam is Brewster angle, this optical window is called Brewster window, this window can realize being similar to lossless transmission perpendicular to the linearly polarized light in direction, interface, has fabulous repeatability.
At present at visible light wave range, by eye-observation or the Efficient Evaluation that can realize Brewster window adjustment by detector technology.But this kind of method is at ultraviolet, infrared band inapplicable, does not propose effective technology both at home and abroad and solves the evaluation problem regulated in ultraviolet and infrared band Brewster window.
The problem that the high precision that the present invention is intended to solve Brewster window within the scope of ultraviolet to far infrared broadband regulates, for the high-precision tolerance biography improving low temperature radiometer provides safeguard.
Figure 1 shows that broadband Brewster window regulating device of the present invention, He-Ne laser instrument produces the visible laser of 632.8nm; Laser power stability device, for improving the power stability of laser, makes the power stability of laser be less than 0.01%30min; Afterwards through the polarization regulating device that the polarizer and analyzer form, the polarization direction of incident light is made to be the linearly polarized light being parallel to incident interface; There is reflection and transmission in Brewster window position in incident linearly polarized light, reflected light is by monitoring detector real time monitoring, so that the state of evaluation window.
Monitor that the output signal of detector needs to amplify process through prime amplifier, because when window enters Brewster state, monitor that the reflected light that detector accepts is very faint, need prime amplifier to realize the amplification of useful signal and the suppression of noise, improve the signal to noise ratio (S/N ratio) of acquisition of signal.
The adjustment of Brewster window relative to incident beam locus mainly rotates fine adjustment by 1,2,3 three knob in Brewster window in Fig. 1.Device of the present invention can meet the fine adjustment realizing this window of cloth scholar within the scope of broadband, well solve and carrying out ultraviolet based on low temperature radiometer, the absolute spectrum experiment Brewster window of infrared band photodetector regulates the problem of difficulty, the assessment mode simultaneously regulated by Brewster window due to the present invention is changed into digitizing by Visual Observations Observations and is shown, reduce the error brought because of human factor, there is the repdocutbility that classic method is incomparable, therefore, restore under basis of the present invention can also realize the line of Brewster window, be convenient to complete window relevant technical characteristics experimental study online.
Based on said apparatus, the invention allows for a kind of broadband Brewster window high precision control method, below method of the present invention is described in detail.
When beam of laser reflects and reflects on the interface of two media, the polarization state of laser is different, and the reflectivity on interface is different.When the angle of reflection ray and refracted ray is 90 degree, based on the known polarization direction of Fresnel formula and refraction law parallel with the plane of incidence component reflectivity be 0, corresponding incident angle is Brewster angle.If the incident light linearly polarized light that to be polarization direction parallel with the plane of incidence, in theory can be loss-free by optical window medium, corresponding reflected light is 0, and now transmitted light has best repeatability.Brewster window is developed based on this principle just.Therefore, the assessment basis that Brewster window regulates is passed through to monitor the minimum value of folded light beam or the maximal value of transmitted light beam just.For same window, the refractive index that different wave length is corresponding different, thus has different Brewster angles, and the object that Brewster window regulates is meet Brewster angle.
The present invention adopts 632.8nm laser as reference laser beam, adopt Si as the optical window material of ultraviolet to near-infrared band, ZnSe as near infrared to far optical window material, below the present invention be that the optical window of material is described for example with Si.
The laser of 632.8nm incides optical window from vacuum, and in vacuum, the refractive index of light is 1, if the refractive index when laser of 632.8nm incides optical window is n
0, utilize Brewster angle defined formula can obtain now corresponding Brewster angle θ
b0, namely incident angle is θ
b0.
By laser power stability system and beam shaping system, reference laser light beam is made to be the linearly polarized light of high stability, high-polarization, adopt high-precision ultraviolet Si trap detector as supervision detector, monitor that request detector has fabulous stability, repeatability and less dark noise, the wavelength effectively can measuring 10nW is the optical radiation of 632.8nm.Monitor that detector is placed in Brewster window lower end, in order to monitor the intensity of reflected light.For any wavelength X of its all band
1, the refractive index of corresponding optical window is n
1, corresponding Brewster angle is θ
b1.
First make the luminous power of reference laser light beam be 1mW by optical path adjusting, power instability is less than 0.01%30min, and the linear polarization being parallel to the plane of incidence has higher polarization ratio.
Incide on optical window with reference to laser beam during test, measuring the luminous power obtaining incident light is P, feedback detector is placed in the light path of folded light beam, regulate window, change the relative position of window and light beam, suitable fine setting polarization state, makes to monitor that the optical radiation that detection obtains is minimum, records the response voltage value V obtained now
0, the state that when Window state is now 632.8nm, Brewster window requires, incident angle equals corresponding Brewster angle θ
b0, have θ
b0and n
0, the polarized component reflectivity ρ in vertical incidence face can be obtained by Fresnel formula
s0, then by the responsiveness R of detector, the luminous power P of vertical polarisation component in reflected light can be obtained
s0.
For wavelength X
1, its refractive index can be obtained by calibration or be calculated by Cauchy Formula, and its value is n
1, corresponding Brewster angle is θ
b1.The incident angle of hypothetical reference light beam equals θ
b1time, the reflectivity ρ of vertical component can be obtained by Fresnel formula
s1with the reflectivity ρ of parallel component
p1, then now, monitor that detector obtains the reflected light sum that optical radiation is two components.Its value is:
Ensureing, under the prerequisite that incident light state is constant, to regulate the locus of Brewster window, observing and monitoring that the response of detector exports, make response output voltage equal V
1time, it is λ that now corresponding Window state is wavelength
1time, the Brewster window state that the optical window of Si material is corresponding.
The high precision that the present invention can realize low temperature radiometer Brewster window in the wavelength band that ultraviolet is wider to far infrared regulates, especially achieve at home the fine adjustment at ultraviolet, short-wave infrared, medium-wave infrared and far infrared band Brewster window first, fill up the domestic blank studied at this surface technology.
The present invention is monitored by theory calculate and digitizing, achieves the digitizing assessment that Brewster window regulates, and makes to regulate result more accurate, for corresponding theoretical analysis provides necessary data.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. a broadband Brewster window regulating device, is characterized in that, He-Ne laser instrument produces the visible laser of 632.8nm; Laser power stability device is for improving the power stability of laser; Through the polarization regulating device that the polarizer and analyzer form, the polarization direction of incident light is made to be the linearly polarized light being parallel to incident interface; There is reflection and transmission in Brewster window position in incident linearly polarized light, reflected light is by monitoring detector real time monitoring.
2. broadband Brewster window regulating device as claimed in claim 1, is characterized in that, the output signal of described supervision detector amplifies process through prime amplifier.
3. based on a kind of broadband Brewster window high precision control method of device described in claim 1 or 2, it is characterized in that, adopt 632.8nm laser as reference laser beam, when the laser of 632.8nm incides optical window from air, the refractive index that optical window is corresponding is n
0, utilize Brewster angle defined formula to obtain now corresponding Brewster angle θ
b0; For any wavelength X of its all band
1, the refractive index of corresponding optical window is n
1, corresponding Brewster angle is θ
b1;
During test, incide on optical window with reference to laser beam, measuring the luminous power obtaining incident light is P, supervision detector is placed in the light path of folded light beam, regulate window, change the relative position of window and light beam, fine setting polarization state, make to monitor that the optical radiation that detector obtains is minimum, record response voltage value V now
0, the state that when Window state is now 632.8nm, Brewster window requires, incident angle equals corresponding Brewster angle θ
b0, have θ
b0and n
0, the polarized component reflectivity ρ in vertical incidence face is obtained by Fresnel formula
s0, then by monitoring the responsiveness R of detector, obtain the luminous power P of vertical incidence face polarized component in reflected light
s0;
For wavelength X
1, its refractive index is obtained by calibration or is calculated by Cauchy Formula, and its value is n
1, corresponding Brewster angle is θ
b1; The incident angle of hypothetical reference light beam equals θ
b1time, the reflectivity ρ of vertical component is obtained by Fresnel formula
s1with the reflectivity ρ of parallel component
p1, then now monitor that detector obtains the reflected light sum that optical radiation is two components, its value is:
Ensureing, under the prerequisite that incident light state is constant, to regulate the locus of Brewster window, observing and monitoring that the response of detector exports, make response output voltage equal V
1time, it is λ that now corresponding Window state is wavelength
1time corresponding Brewster window state.
4. broadband Brewster window control method as claimed in claim 3, it is characterized in that, first make the luminous power of reference laser light beam be 1mW by optical path adjusting, power instability is less than 0.01%30min.
5. broadband Brewster window control method as claimed in claim 3, is characterized in that, adopts Si as the optical window material of ultraviolet to near-infrared band, ZnSe as near infrared to far optical window material.
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| CN201510981179.8A CN105387933B (en) | 2015-12-24 | 2015-12-24 | A kind of broadband Brewster window regulating device and method |
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| CN201510981179.8A CN105387933B (en) | 2015-12-24 | 2015-12-24 | A kind of broadband Brewster window regulating device and method |
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| CN105387933B CN105387933B (en) | 2019-02-26 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109454324A (en) * | 2017-08-25 | 2019-03-12 | 株式会社迪思科 | Laser beam analyzer unit and laser processing device |
| 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 |
| CN109580182A (en) * | 2018-12-18 | 2019-04-05 | 北京理工大学 | Curved optical device refractive index measurement method and device based on Brewster's law |
| CN109752858A (en) * | 2019-03-18 | 2019-05-14 | 贵州航天电子科技有限公司 | A kind of linearly polarized laser transmitting optics |
| CN110440915A (en) * | 2019-08-02 | 2019-11-12 | 中国电子科技集团公司第四十一研究所 | A kind of compact long-range detection spectrometer based on linear variable filter light splitting |
| CN111048970A (en) * | 2019-11-20 | 2020-04-21 | 南京航空航天大学 | Polarization device based on double Brewster plates and adjusting method |
| CN116380256A (en) * | 2023-06-07 | 2023-07-04 | 长春理工大学 | Short-wave infrared full-polarization imaging device and method based on haze attenuation coefficient |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109454324A (en) * | 2017-08-25 | 2019-03-12 | 株式会社迪思科 | Laser beam analyzer unit and laser processing device |
| 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 |
| CN109580182A (en) * | 2018-12-18 | 2019-04-05 | 北京理工大学 | Curved optical device refractive index measurement method and device based on Brewster's law |
| 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 |
| CN109752858A (en) * | 2019-03-18 | 2019-05-14 | 贵州航天电子科技有限公司 | A kind of linearly polarized laser transmitting optics |
| CN110440915A (en) * | 2019-08-02 | 2019-11-12 | 中国电子科技集团公司第四十一研究所 | A kind of compact long-range detection spectrometer based on linear variable filter light splitting |
| 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 |
| CN111048970A (en) * | 2019-11-20 | 2020-04-21 | 南京航空航天大学 | Polarization device based on double Brewster plates and adjusting method |
| 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 |
| CN116380256A (en) * | 2023-06-07 | 2023-07-04 | 长春理工大学 | Short-wave infrared full-polarization imaging device and method based on haze attenuation coefficient |
| 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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