CN109931885A - A kind of device of precise measurement light beam incidence angle - Google Patents
A kind of device of precise measurement light beam incidence angle Download PDFInfo
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- CN109931885A CN109931885A CN201910169429.6A CN201910169429A CN109931885A CN 109931885 A CN109931885 A CN 109931885A CN 201910169429 A CN201910169429 A CN 201910169429A CN 109931885 A CN109931885 A CN 109931885A
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- 238000005259 measurement Methods 0.000 title claims abstract description 36
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 50
- 210000002858 crystal cell Anatomy 0.000 claims abstract description 44
- 239000013078 crystal Substances 0.000 claims abstract description 8
- 239000004988 Nematic liquid crystal Substances 0.000 claims abstract description 6
- 238000001514 detection method Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 16
- 230000003287 optical effect Effects 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 2
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- 230000005540 biological transmission Effects 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005622 photoelectricity Effects 0.000 description 2
- 238000001028 reflection method Methods 0.000 description 2
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Abstract
The present invention discloses a kind of device of precise measurement light beam incidence angle, it is related to G02F optical technical field, including laser, beam splitter, reflecting mirror, liquid crystal cell and detector, laser is concurrently incident upon in beam splitter for generating Gaussian beam, beam splitter is used to be the equal Gaussian beam of two beam intensities by Gaussian beam beam splitting, light beam emits to liquid crystal cell, another light beams inject liquid crystal cell by reflecting mirror with certain incident angle, detector passes through the light intensity after liquid crystal cell for measuring beam, the PT symmetric crystal lattice and its strong nonlocal nonlinear constituted using nematic liquid crystal, according to the one-to-one relationship of light intensity of the transmitted light after liquid crystal cell and reflection angle of light, the incidence angle of reflected light is directly determined by light intensity of the measurement transmitted light after liquid crystal cell, whole process is simple and easy, it is convenient and efficient；Good environmental adaptability, cost is relatively low, and accuracy of measurement is high, can satisfy the measurement request of minute angle.
Description
Technical field
The present invention relates to G02F optical technical field more particularly to a kind of devices of precise measurement light beam incidence angle.
Background technique
Fine angle measurement is always that engineering field needs the problem of improving, and optical means is a kind of precise measurement low-angle
Important method.The optics narrow angle measuring method applied at present mainly has optical internal-reflection method, CCD optics angle-measuring method, circle light
Grid method, double-frequency laser interference method, optical imagery autocollimation method and accurate photoelectricity small angle measurement method etc..The master of optical internal-reflection method
Want advantage be it is small in size, can be made pocket angular instrument, but its accuracy of measurement is not high.CCD optics angle-measuring method it is main excellent
Point is that operation is relatively simple, but accuracy of measurement is not high enough.The major advantage of Circular gratings method is accuracy of measurement height, but Gao Zhun
The production processing of exactness grating is highly difficult.Although double-frequency laser interference method small angle measurement precision is higher, bulky.Optics
Although it is high that autocollimation method measurement accuracy is imaged, environmental suitability is poor, high to measurement environmental requirement, is more suitable for good in environment
Laboratory in carry out.Although accurate photoelectricity small angle measurement method measurement accuracy is high, has both attitude angle measurement ability and space
Datum tool function, but it is at high cost.
Summary of the invention
The present invention provides a kind of device of precise measurement light beam incidence angle aiming at the problem that background technique, solves existing small
Angle measurement technique cannot take into account high accuracy of measurement, easy to operate, good environmental adaptability and problem at low cost.
To achieve the goals above, the present invention proposes a kind of device of precise measurement light beam incidence angle, including laser, point
Beam device, reflecting mirror, liquid crystal cell and detector, wherein the laser is concurrently incident upon in beam splitter for generating Gaussian beam,
The beam splitter is used to be the equal Gaussian beam of two beam intensities by Gaussian beam beam splitting, and light beam emits to liquid crystal cell,
Another light beams inject liquid crystal cell by reflecting mirror with certain incident angle, and the detector passes through liquid crystal for measuring beam
Light intensity after box obtains corresponding light intensity by adjusting different incident angles respectively, to obtain pair of incident angle and light intensity
It should be related to；Incident angle to be measured is determined according to the surveyed light intensity of detector when detection.
Preferably, the equal Gaussian beam of two beam intensities, wherein light beam is transmitted light, and another light beams are
Reflected light.
Preferably, the detector passes through the light intensity after liquid crystal cell for measuring beam, specifically: measurement transmitted light is logical
Light intensity after crossing liquid crystal cell.
Preferably, the liquid crystal cell, internal nematic liquid crystal constitute PT symmetric crystal lattice.
Preferably, the corresponding relationship of the incident angle and light intensity is determined by nonlocal nonlinear Schrodinger equation.
Preferably, the light beam emits to liquid crystal cell, specifically: light beam Vertical Launch to liquid crystal cell.
The present invention proposes a kind of device of precise measurement light beam incidence angle, and the PT that can be constituted using nematic liquid crystal is symmetrical
Lattice and its strong nonlocal nonlinear are closed according to the one-to-one correspondence of light intensity of the transmitted light after liquid crystal cell and reflection angle of light
System directly determines the incidence angle of reflected light by light intensity of the measurement transmitted light after liquid crystal cell, and whole process is simple and easy, side
Just quick.This method is a kind of method of good non-cpntact measurement angle, and good environmental adaptability, cost is relatively low, and is measured quasi-
Exactness is high, can satisfy the measurement request of minute angle, provides a kind of good measurement means for many engineering fields.
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
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the schematic illustration of the device of precise measurement light beam incidence angle in an embodiment of the present invention；
Fig. 2 is by transmitted light obtains increasing in the case where tan θ=± 0.5 in PT symmetric crystal lattice in an embodiment of the present invention
Beneficial schematic diagram；
Fig. 3 is light of the corresponding transmitted light of difference reflected light incidence angle θ after liquid crystal cell in an embodiment of the present invention
Strong schematic diagram；
Label declaration:
1- laser, 2- beam splitter, 3- reflecting mirror, 4- liquid crystal cell, 5- detector；
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object 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 embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that if relating to directionality instruction (such as up, down, left, right, before and after ...) in the embodiment of the present invention,
Then directionality instruction be only used for explain under a certain particular pose (as shown in the picture) between each component relative positional relationship,
Motion conditions etc., if the particular pose changes, directionality instruction is also correspondingly changed correspondingly.
In addition, being somebody's turn to do " first ", " second " etc. if relating to the description of " first ", " second " etc. in the embodiment of the present invention
Description be used for description purposes only, be not understood to indicate or imply its relative importance or implicitly indicate indicated skill
The quantity of art feature." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one spy
Sign.It in addition, the technical solution between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
It is enough realize based on, will be understood that the knot of this technical solution when conflicting or cannot achieve when occurs in the combination of technical solution
Conjunction is not present, also not the present invention claims protection scope within.
The present invention proposes a kind of device of precise measurement light beam incidence angle；
In first preferred embodiment of the invention, as shown in Figure 1, including laser 1, beam splitter 2, reflecting mirror 3, liquid crystal cell 4
With detector 5, wherein the laser 1 is concurrently incident upon in beam splitter 2 for generating Gaussian beam, and the beam splitter 2 is used
In being the equal Gaussian beam of two beam intensities by Gaussian beam beam splitting, through Beam (as reference light), a branch of reflected light, thoroughly
Light Vertical Launch is penetrated to liquid crystal cell 4, reflected light injects liquid crystal cell 4, the detection by reflecting mirror 3 with certain incident angle θ
Device 5 is used to measure transmitted light by the light intensity after liquid crystal cell 4, obtains corresponding light respectively by adjusting different incident angle θ
By force, to obtain the corresponding relationship of incident angle θ and light intensity；Incidence angle to be measured is determined according to the surveyed light intensity of detector 5 when detection
Spend θ.
In the embodiment of the present invention, liquid crystal cell is used, it is symmetrically brilliant that the nematic liquid crystal filled inside liquid crystal cell may be constructed PT
Lattice, and have strong nonlocal nonlinear；Based in PT symmetric crystal lattice, reflection angle of light is different, the increasing that transmitted light obtains
Also this different characteristic, light intensity of the available transmitted light after liquid crystal cell and the one-to-one correspondence for reflecting angle of light close benefit
System, and then the light intensity by measurement transmitted light after liquid crystal cell transmission, to determine reflection angle of light.Herein, it needs to illustrate
It is that liquid crystal cell can be changed into other to have strong nonlocal nonlinear and the material of PT symmetric crystal lattice can be constituted.
In the embodiment of the present invention, the corresponding relationship of the incident angle θ and light intensity pass through nonlocal nonlinearity Schrodinger
Equation determines, specific as follows:
The Gaussian Beam beam splitter that the laser issues is divided into two bundles the equal Gaussian beam of intensity, and transmitted light is vertical
Liquid crystal cell is injected, light beam 1 is denoted as, as reference light, reflected light injects liquid crystal cell through reflecting mirror with incidence angle θ, it is denoted as light beam 2,
The initial light field u (x, 0) for then injecting liquid crystal cell front surface may be expressed as:
Wherein, A1, A2It is the normalized amplitude of transmitted light and reflected light, w respectively1, w2It is the space of transmitted light and reflected light
Beamwidth, d are distances when transmitted light and reflected light inject liquid crystal cell front surface, tan θ be it is nondimensional, it is to pass through 1/kw0Into
Row dimensionless transformation；
The liquid crystal material filled inside the liquid crystal cell is the PT symmetric crystal lattice that nematic liquid crystal is constituted, while having strong non-office
Domain is non-linear, and transmission of the light beam in liquid crystal cell meets following dimensionless nonlocal nonlinear Schrodinger equation:
The nonlinear response function of liquid crystal material are as follows:
Wherein, wNCLIt is the nondimensionalization space characteristics length of liquid crystal material；
The symmetrical potential function of the PT of liquid crystal material are as follows:
VPT(x)=APT[cos2(x)+iVsin(2x)] (4)
Since in PT symmetric crystal lattice, reflected light incidence angle θ is different, the gain that transmitted light obtains is also different, such as Fig. 2 institute
Show.Therefore light intensity of the transmitted light after liquid crystal cell and reflected light incidence angle θ can be obtained one by one by the size of change θ
Corresponding relationship, as shown in Figure 3.
Light intensity of the transmitted light after liquid crystal cell transmission is measured with detector, passes through liquid crystal further according to transmitted light obtained above
The one-to-one relationship of light intensity and reflected light incidence angle θ after box, can obtain reflected light incidence angle θ.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all at this
Under the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectly
It is included in other related technical areas in scope of patent protection of the invention.
Claims (6)
1. a kind of device of precise measurement light beam incidence angle, which is characterized in that including laser, beam splitter, reflecting mirror, liquid crystal cell
And detector, wherein the laser is concurrently incident upon in beam splitter for generating Gaussian beam, and the beam splitter is used for will
Gaussian beam beam splitting is the equal Gaussian beam of two beam intensities, and light beam emits to liquid crystal cell, and another light beams are by reflection
Mirror injects liquid crystal cell with certain incident angle, and the detector, by the light intensity after liquid crystal cell, passes through tune for measuring beam
Whole different incident angle obtains corresponding light intensity respectively, to obtain the corresponding relationship of incident angle and light intensity；When detection according to
The surveyed light intensity of detector determines incident angle to be measured.
2. the device of precise measurement light beam incidence angle according to claim 1, which is characterized in that the two beam intensity phases
Deng Gaussian beam, wherein light beam be transmitted light, another light beams be reflected light.
3. the device of precise measurement light beam incidence angle according to claim 1, which is characterized in that the detector is used for
Measuring beam passes through the light intensity after liquid crystal cell, specifically: measurement transmitted light passes through the light intensity after liquid crystal cell.
4. the device of precise measurement light beam incidence angle according to claim 1, which is characterized in that the liquid crystal cell,
Internal nematic liquid crystal constitutes PT symmetric crystal lattice.
5. the device of precise measurement light beam incidence angle according to claim 1, which is characterized in that the incident angle with
The corresponding relationship of light intensity is determined by nonlocal nonlinear Schrodinger equation.
6. the device of precise measurement light beam incidence angle according to claim 1, which is characterized in that the light beam hair
It is incident upon liquid crystal cell, specifically: light beam Vertical Launch to liquid crystal cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910169429.6A CN109931885B (en) | 2019-03-06 | 2019-03-06 | Device for accurately measuring incidence angle of light beam |
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| CN201910169429.6A CN109931885B (en) | 2019-03-06 | 2019-03-06 | Device for accurately measuring incidence angle of light beam |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111029900A (en) * | 2019-12-25 | 2020-04-17 | 中国科学院半导体研究所 | Three-cavity coupling laser based on space-weighted time symmetry |
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| US6081337A (en) * | 1998-05-05 | 2000-06-27 | The Hong Kong University Of Science & Technology | Method and apparatus for measuring liquid crystal cell properties |
| CN1804586A (en) * | 2005-10-28 | 2006-07-19 | 华南师范大学 | Method for precisely measuring incident angle by means of laser feedback and application thereof |
| CN101825785A (en) * | 2009-03-03 | 2010-09-08 | 大塚电子株式会社 | The inclination angle determination method of reflective type liquid crystal cell and determinator |
| CN102147536A (en) * | 2011-03-11 | 2011-08-10 | 中国科学院上海光学精密机械研究所 | Dual-path controllable one-dimensional optic crystal lattice device |
| CN104914585A (en) * | 2015-07-08 | 2015-09-16 | 湖南大学 | Non-local-media-based spatial frequency beam splitter |
| CN106885787A (en) * | 2017-04-07 | 2017-06-23 | 华南师范大学 | A kind of method and apparatus for measuring the coarse film complex refractivity index of glass surface |
| CN209802321U (en) * | 2019-03-06 | 2019-12-17 | 华南师范大学 | Device for accurately measuring light beam incident angle |
-
2019
- 2019-03-06 CN CN201910169429.6A patent/CN109931885B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6081337A (en) * | 1998-05-05 | 2000-06-27 | The Hong Kong University Of Science & Technology | Method and apparatus for measuring liquid crystal cell properties |
| CN1804586A (en) * | 2005-10-28 | 2006-07-19 | 华南师范大学 | Method for precisely measuring incident angle by means of laser feedback and application thereof |
| CN101825785A (en) * | 2009-03-03 | 2010-09-08 | 大塚电子株式会社 | The inclination angle determination method of reflective type liquid crystal cell and determinator |
| CN102147536A (en) * | 2011-03-11 | 2011-08-10 | 中国科学院上海光学精密机械研究所 | Dual-path controllable one-dimensional optic crystal lattice device |
| CN104914585A (en) * | 2015-07-08 | 2015-09-16 | 湖南大学 | Non-local-media-based spatial frequency beam splitter |
| CN106885787A (en) * | 2017-04-07 | 2017-06-23 | 华南师范大学 | A kind of method and apparatus for measuring the coarse film complex refractivity index of glass surface |
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Non-Patent Citations (1)
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| 范志新等: "棱镜晶体旋转法测量液晶器件大预倾角", 光学学报, vol. 26, no. 11, pages 1671 - 1675 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111029900A (en) * | 2019-12-25 | 2020-04-17 | 中国科学院半导体研究所 | Three-cavity coupling laser based on space-weighted time symmetry |
| CN111029900B (en) * | 2019-12-25 | 2020-11-03 | 中国科学院半导体研究所 | Three-cavity coupling laser based on space-weighted time symmetry |
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