CN106290254A - A kind of refractometry device, refractive index measurement method and device - Google Patents
A kind of refractometry device, refractive index measurement method and device Download PDFInfo
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- CN106290254A CN106290254A CN201610589278.6A CN201610589278A CN106290254A CN 106290254 A CN106290254 A CN 106290254A CN 201610589278 A CN201610589278 A CN 201610589278A CN 106290254 A CN106290254 A CN 106290254A
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- magnetic
- refractive index
- light
- refractometry
- angle
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/43—Refractivity; Phase-affecting properties, e.g. optical path length by measuring critical angle
Abstract
The present invention relates to field of optical measuring technologies, disclose a kind of refractometry device, refractive index measurement method and device, the refractometry scope of this refractometry device is adjustable, thus expands the measurement scope of application.This refractometry device includes the field generator for magnetic producing adjustable magnetic fields, it is positioned at magnetic field produced by field generator for magnetic and inside is filled with the housing of magnetic fluid, immerse optical transmitting set, optical receiver and the measured sample in magnetic fluid, the control processor being connected respectively with field generator for magnetic and optical receiver.Optical transmitting set is for launching light towards measured sample, and optical receiver is for receiving the light through measured sample reflection, and reflection light is to set angle with the angle of incident ray；Control processor to be totally reflected and according to occurring critical magnetic field strength during total reflection to determine magnetic fluid refractive index for determining whether generation, and determine the refractive index of measured sample according to magnetic fluid refractive index and setting angle.
Description
Technical field
The present invention relates to field of optical measuring technologies, particularly to a kind of refractometry device, refractive index measurement method
And device.
Background technology
Optical enhancement film and optical lens are the elemental device of optical field, its application widely, including: micro-
Mirror, camera, exposure machine, mobile phone and display device etc..The index weighing blooming and optical lens quality should comprise thickness, song
Rate, refractive index, reflectance, absorbance etc..Wherein, refractive index is to characterize optical property most important of blooming and optical lens
One of parameter, the important step being measured as technology controlling and process and quality control of refractive index.
Existing refractometry mode has cirtical angle of total reflection measurement method and polarization polarizing angle measurement method.Common Abbe
Refractometer is to measure refractive index based on the principle measuring critical angle, and common ellipsometer is mutual with material based on polarized light
The principle of effect measures refractive index.When light occurs total reflection to refer to the interface that light is mapped to optically thinner medium by optically denser medium, all
It is reflected back toward the phenomenon in former medium.
Above-mentioned prior art has the disadvantage that the refractive index of the internal prism of tradition refractometry device is certain
Value, thus cause the measurement scope of application of refractometry device narrower.
Summary of the invention
The invention provides a kind of refractometry device, refractive index measurement method and device, so that refractometry sets
Standby refractometry scope is adjustable, thus expands the refractometry scope of application.
For reaching above-mentioned purpose, the present invention provides techniques below scheme:
On the one hand, the present invention provides a kind of refractometry device, including:
Field generator for magnetic, the magnetic field intensity scalable that described field generator for magnetic produces；
Housing, is positioned at magnetic field produced by field generator for magnetic and inside is filled with magnetic fluid；
Optical transmitting set and optical receiver, optical transmitting set, optical receiver and measured sample immerse in magnetic fluid, optical transmitting set
For launching light towards measured sample, optical receiver is for receiving the light through measured sample reflection, described reflection light
Line is to set angle with the angle of incident ray；
Control processor, be connected with field generator for magnetic and optical receiver, for receiving the light acceptance amount letter of optical receiver
Breath, when light acceptance amount reaches the light acceptance amount threshold value set, it is determined that described incident ray there occurs total reflection；And according to incidence
Light occurs critical magnetic field strength during total reflection to determine magnetic fluid refractive index, and according to magnetic fluid refractive index and setting angle,
Determine the refractive index of measured sample.
Preferably, described magnetic fluid includes liquid phase carrier fluid and is scattered in the magnetic-particle in described liquid phase carrier fluid, described
Active dose of the Surface coating of magnetic-particle；Described magnetic-particle includes ferriferrous oxide particles, ferric oxide particle and sky
So magnetic particles；Described activating agent includes oleic acid, linoleic acid and olive oil.
Preferably, described liquid phase carrier fluid includes water, kerosene and ethanol.
Preferably, described housing is non magnetic housing.
Preferably, described housing includes glass shell, ceramic shell, plastic casing or resin-case.
Preferably, described inner walls has light-absorption layer.
Preferably, described field generator for magnetic includes solenoid and for the adjustable DC constant current powered to described solenoid
Power supply；Described housing is positioned at the solenoid of described field generator for magnetic.
Preferably, described optical receiver at least two.
In the refractometry device that the present invention provides, the position between optical transmitting set, measured sample and optical receiver
Determine the angle of incidence of the light that optical transmitting set sends.Optical transmitting set emits beam and is radiated at measured sample surface, light-receiving
Device can accept the light of sample reflection, controls the light acceptance amount that accepts according to optical receiver of processor and optical transmitting set
Light emission amount judges whether to there occurs total reflection.Owing to just can send out when light is on the interface from optically denser medium directive optically thinner medium
Raw total reflection, the magnetic fluid refractive index under the action of a magnetic field that field generator for magnetic produces filled in the housing of the present invention is adjustable,
The controlled processor of flux control of field generator for magnetic controls gradual change.The gradual change from low to high of the refractive index of magnetic fluid, incident illumination
Line has the critical refraction rate value that total reflection occurs, now the entering of incident ray during being reflected to be totally reflected
The firing angle i.e. cirtical angle of total reflection of measured sample.Control processor according to this critical refraction rate value and critical angle can calculate by
The refractive index of measuring samples.The present invention provide refractometry device by measure medium refractive index adjustable, expand by
The refractometry of measuring samples is interval, thus expands the measurement scope of application of refractometry device.
On the other hand, present invention also offers a kind of refractometry side being applied to refractometry device described above
Method, including:
Receive the light acceptance amount information of described optical receiver, when light acceptance amount reaches the light acceptance amount threshold value set, sentence
Fixed described incident ray there occurs total reflection；
Obtain described incident ray and critical magnetic field strength corresponding when being totally reflected occurs；
Critical magnetic field strength during total reflection is occurred to determine magnetic fluid refractive index according to described incident ray；
According to magnetic fluid refractive index and setting angle, determining the refractive index of measured sample, the described angle that sets is as described
Reflection light and the angle of incident ray.
The refractive index measurement method that the present invention provides measures the refractive index of medium magnetic fluid by adjusting, and obtains and is all-trans
Setting angle, critical magnetic field strength and magnetic fluid refractive index corresponding when penetrating, finally draws the refractive index of measured sample.This folding
Penetrate rate measuring method and device to expand the refractometry of measured sample interval, thus expand refractometry device
Measure the scope of application.
Present invention also offers a kind of apparatus for measuring refractive index being applied to refractometry device described above, including:
Total reflection identifying unit, for receiving the light acceptance amount information of described optical receiver, when light acceptance amount reaches to set
Light acceptance amount threshold value time, it is determined that described incident ray there occurs total reflection；
Acquiring unit, for obtaining critical magnetic field strength when described incident ray occurs total reflection；
First determines unit, for occurring critical magnetic field strength during total reflection to determine correspondence according to described incident ray
Magnetic fluid refractive index；
Second determines unit, for according to magnetic fluid refractive index and setting angle, determining the refractive index of measured sample, institute
State the angle setting angle as described reflection light Yu incident ray.
The apparatus for measuring refractive index that the present invention provides measures the refractive index of medium magnetic fluid by adjusting, and obtains and is all-trans
Setting angle, critical magnetic field strength and magnetic fluid refractive index corresponding when penetrating, finally draws the refractive index of measured sample.This folding
Penetrate rate measuring method and device to expand the refractometry of measured sample interval, thus expand refractometry device
Measure the scope of application.
Accompanying drawing explanation
The structural representation of the refractometry device that Fig. 1 provides for an embodiment of the present invention；
The structural representation of the refractometry device that Fig. 2 provides for a kind of preferred embodiment of the present invention；
The structural representation of the refractometry device that Fig. 3 provides for another kind preferred embodiment of the present invention；
Fig. 4 is the flow chart of the refractive index measurement method of the present invention；
Fig. 5 is the structural representation of the apparatus for measuring refractive index of the present invention.
Reference:
1-field generator for magnetic
2-housing
3-optical transmitting set
4-optical receiver
5-measured sample
6-controls processor
7-supports seat
101-magnetic field
201-magnetic fluid
11-apparatus for measuring refractive index
111-is totally reflected identifying unit
112-acquiring unit
113-first determines unit
114-second determines unit
Detailed description of the invention
In order to expand the refractometry scope of application, embodiments provide a kind of refractometry device, refraction
Rate measuring method and device.For making the object, technical solutions and advantages of the present invention clearer, by the following examples to the present invention
It is described in further detail.
Reference Fig. 1, the refractometry device that an embodiment of the present invention provides, including:
Field generator for magnetic 1, the magnetic field intensity scalable that field generator for magnetic 1 produces；
Housing 2, is positioned at magnetic field 101 and inside produced by field generator for magnetic 1 and is filled with magnetic fluid 201；
Optical transmitting set 3 and optical receiver 4, optical transmitting set 3, optical receiver 4 and measured sample 5 immerse in magnetic fluid 201,
Optical transmitting set 3 is for launching light towards measured sample 5, and optical receiver 4 is for receiving the light through measured sample 5 reflection
Line, described reflection light is to set angle with the angle of incident ray；
Control processor 6, be connected with field generator for magnetic 1 and optical receiver 3, for receiving the light-receiving of optical receiver 3
Amount information, when light acceptance amount reaches the light acceptance amount threshold value set, it is determined that incident ray there occurs total reflection；And according to generation
Critical magnetic field strength during total reflection determines magnetic fluid 201 refractive index, and according to magnetic fluid 201 refractive index and setting angle, really
Determine the refractive index of measured sample 5.The installation site controlling processor 6 is not specifically limited by the present invention, is arranged in Fig. 1
It is only an example on field generator for magnetic 1 limit, controls the connection side between processor 6 and field generator for magnetic 1 and optical receiver 3
Formula includes wired connection and wireless connections, owing to being filled with magnetic fluid 201 in the housing 2 of the present invention, preferably uses wireless company
The mode connect carries out information transmission.
In the refractometry device that the present invention provides, the position between optical transmitting set 3, measured sample 5 and optical receiver 4
Put the angle of incidence determining the light that optical transmitting set 3 sends.Optical transmitting set 3 emits beam and is radiated at measured sample 5 surface, light
Receptor 4 can accept the light of sample 5 reflection, controls light acceptance amount and light that processor 6 accepts according to optical receiver 4
The light emission amount of emitter 3 judges whether to there occurs total reflection.When light acceptance amount reaches the light acceptance amount threshold value set, it is determined that
Incident ray i.e. there occurs total reflection, and the light acceptance amount threshold value of this setting can be the setting percentage ratio of light emission amount, concrete
Rule of thumb or test draws by operator to set percentage ratio.Owing to light is at the interface from optically denser medium directive optically thinner medium
Just can be totally reflected time upper, the magnetic field 101 that the magnetic fluid 201 filled in the housing 2 of the present invention produces at field generator for magnetic 1
The lower refractive index of effect is adjustable, and the controlled processor of flux control 6 of field generator for magnetic 1 controls gradual change.The refraction of magnetic fluid 201
Rate gradual change from low to high, incident ray has the critical refraction that total reflection occurs during being reflected to be totally reflected
Rate value, now the angle of incidence of the incident ray i.e. cirtical angle of total reflection of measured sample (magnetic fluid refractive index also can from high to low,
Corresponding incident ray partially reflective also has critical refraction rate value from being totally reflected to).Control processor 6 according to this critical refraction
Rate value and critical angle can calculate the refractive index of measured sample 5.The refractometry device that the present invention provides is surveyed by realization
The refractive index of amount medium is adjustable, and the refractometry expanding measured sample 5 is interval, thus expands refractometry device
The measurement scope of application.
In a preferred embodiment of refractometry device of the present invention, as in figure 2 it is shown, magnetic fluid 201 includes: magnetic
Property granule, it is coated on the activating agent on described magnetic-particle surface, for dispersed magnetic granule and as magnetic-particle flowing carrier
Liquid phase carrier fluid.The medium refraction index that the setting of magnetic fluid 201 achieves refractometry device is adjustable, and activating agent can disperse
Magnetic-particle, liquid phase carrier fluid is more beneficial for the flowing of magnetic fluid 201 and the rearrangement of magnetic-particle, thus preferably completes folding
Penetrate rate regulation process.
It is further preferred that magnetic-particle includes ferriferrous oxide particles, ferric oxide particle and lodestone granule,
Activating agent includes that oleic acid, linoleic acid and olive oil, liquid phase carrier fluid include water, kerosene and ethanol.Ferriferrous oxide particles, three oxidations
Two ferrum granules and lodestone granule are respectively provided with good magnetic effect, disperse the most fast as magnetic-particle in liquid phase carrier fluid
Speed is uniformly.Water, kerosene and ethanol are relatively conventional dispersant, cheap and good fluidity.The selection of activating agent is then wanted
In view of the interaction between liquid phase carrier fluid and activating agent, the preferred oleic acid of activating agent of the present invention, oleic acid has as activating agent
There are hydrophilic group and hydrophobic group, are coated on magnetic-particle surface and can be well dispersed in liquid phase carrier fluid.
Owing to the housing 2 of refractometry device and the magnetic fluid 201 of the present invention are in what field generator for magnetic 1 produced
In magnetic field 101, and magnetic fluid 201 is filled in housing 2, changes magnetic fluid 201 by magnetic field 101 effect with magnetic fluid 201
Refractive index.Permanent magnet material and ferrimagnet can produce interference to magnetic field 101, and therefore housing 2 is preferably non magnetic housing.Magnetic field
101 could act on magnetic fluid 201 uninterruptedly, and magnetic fluid is preferably with change of magnetic field strength.It is further preferred that should
Housing 2 includes glass shell, ceramic shell, plastic casing or resin-case, can also arrange a support seat 7 in housing 2, uses
In holding measured sample 5, the material simultaneously supporting seat 7 also should preferably employ nonmagnetic substance.Glass material fineness is good, beautiful
See and cheap.It is further preferred that housing 2 inwall has light-absorption layer.I.e. glass shell, ceramic shell, plastic casing or
One layer of light-absorption layer of resin-case inwall brushing, reduces housing 2 Internal photoemission device 3 and the interference of optical receiver 4.
Preferably, the field generator for magnetic 1 of the refractometry device of the present invention includes solenoid 102 and for helical
The adjustable DC constant current source 103 of circle 102 power supply；And housing 2 is positioned at the solenoid 102 of field generator for magnetic 1.Adjustable DC
Constant current source 103 is by controlling the electric current of processor 6 regulation output, thus reaches to control the mesh of solenoid 102 internal magnetic field intensity
's.Magnetic field within solenoid 102 is similar to uniform magnetic field, and the magnetic fluid 201 filled in housing 2 is in its folding in uniform magnetic field
Rate of penetrating also is more uniformly distributed, and its refractive index is the quickest and uniform with uniform magnetic field Strength Changes simultaneously.And in solenoid 102
Magnetic field intensity to be the relevant relation of one_to_one corresponding by the electric current of solenoid 102, it is simple to regulation solenoid 102 in magnetic field
Intensity.Therefore electric current, magnetic field intensity and the magnetic fluid refractive index three of adjustable DC constant current source 103 output has determine right
Answer increasing function relation.
In another preferred embodiment of refractometry device of the present invention, as it is shown on figure 3, preferably by two
Optical receiver 4.The light that optical transmitting set 3 is launched is irradiated in the non-planar surface of measured sample 5, respectively by two optical receivers
4 receive, then controlling processor 6 can be respectively according to the two optical receiver 4 and the predetermined angle of optical transmitting set 3 and light acceptance amount
Calculate the refractive index of measured sample 5, finally the refractive index calculated according to two optical receivers 4 calculating meansigma methods is obtained
Final sample refractive index.Arrange simultaneously two optical receivers 4 can more accurately measure quickly total reflection angle and
Magnetic field range, and then can more convenient, fast, accurately judge to occur the condition of total reflection.
As shown in Figure 4, a kind of refractometry being applied to refractometry device described above that the present invention also provides for
Method, including:
Step S1: receive the light acceptance amount information of optical receiver, when light acceptance amount reaches the light acceptance amount threshold value set,
Judge that incident ray i.e. there occurs total reflection；
Step S2: obtain incident ray and critical magnetic field strength corresponding when being totally reflected occurs；
Step S3: occur critical magnetic field strength during total reflection to determine magnetic fluid refractive index according to incident ray；
Step S4: according to magnetic fluid refractive index and setting angle, determine the refractive index of measured sample, set angle as anti-
Penetrate the angle of light and incident ray.
Wherein, magnetic fluid refractive index has corresponding functional relationship with the magnetic field intensity in the magnetic field shrouding magnetic fluid, can root
Your refractive index of magnetic force in corresponding moment is drawn according to magnetic field intensity.When determining sample refractive index, it is assumed that reflection light and incident illumination
Angle is set as θ, magnetic fluid refractive index as n between line1, sample refractive index be n2, be known to occur total reflection time angle of incidence
θ/2 and magnetic fluid refractive index n1In the case of, can be according to cirtical angle of total reflection formula sin (θ/2)=n2/n1Show that sample reflects
Rate n2。
The refractive index measurement method that the present invention provides measures the refractive index of medium magnetic fluid by adjusting, and obtains and is all-trans
Setting angle, critical magnetic field strength and magnetic fluid refractive index corresponding when penetrating, finally draws the refractive index of measured sample.This folding
Penetrate rate measuring method and device to expand the refractometry of measured sample interval, thus expand refractometry device
Measure the scope of application.
As it is shown in figure 5, a kind of refractometry being applied to refractometry device described above that the present invention also provides for
Device 11, including:
Total reflection identifying unit 111, for receiving the light acceptance amount information of optical receiver, when light acceptance amount reaches setting
During light acceptance amount threshold value, it is determined that incident ray i.e. there occurs total reflection；
Acquiring unit 112, for obtaining critical magnetic field strength when incident ray occurs total reflection；
First determines unit 113, for occurring critical magnetic field strength during total reflection to determine correspondence according to incident ray
Magnetic fluid refractive index；
Second determines unit 114, for according to magnetic fluid refractive index and setting angle, determining the refraction of measured sample
Rate, sets the angle angle as reflection light with incident ray.
The apparatus for measuring refractive index that the present invention provides measures the refractive index of medium magnetic fluid by adjusting, and obtains and is all-trans
Setting angle, critical magnetic field strength and magnetic fluid refractive index corresponding when penetrating, finally draws the refractive index of measured sample.This folding
Penetrate rate measuring method and device to expand the refractometry of measured sample interval, thus expand refractometry device
Measure the scope of application.
Obviously, those skilled in the art can carry out various change and modification without deviating from this to the embodiment of the present invention
Bright spirit and scope.So, if these amendments of the present invention and modification belong to the claims in the present invention and equivalent technologies thereof
Within the scope of, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. a refractometry device, it is characterised in that including:
Field generator for magnetic, the magnetic field intensity scalable that described field generator for magnetic produces；
Housing, is positioned at magnetic field produced by field generator for magnetic and inside is filled with magnetic fluid；
Optical transmitting set and optical receiver, described optical transmitting set, optical receiver and measured sample immerse in magnetic fluid, optical transmitting set
For launching light towards measured sample, optical receiver is for receiving the light through measured sample reflection, described reflection light
Line is to set angle with the angle of incident ray；
Control processor, be connected with field generator for magnetic and optical receiver, for receiving the light acceptance amount letter of described optical receiver
Breath, when light acceptance amount reaches the light acceptance amount threshold value set, it is determined that described incident ray there occurs total reflection；And according to described
Incident ray occurs critical magnetic field strength during total reflection to determine magnetic fluid refractive index, and according to magnetic fluid refractive index and setting folder
Angle, determines the refractive index of measured sample.
Refractometry device the most according to claim 1, it is characterised in that described magnetic fluid include liquid phase carrier fluid and
It is scattered in the magnetic-particle in described liquid phase carrier fluid, active dose of the Surface coating of described magnetic-particle.
Refractometry device the most according to claim 2, it is characterised in that described magnetic-particle includes ferroso-ferric oxide
Granule, ferric oxide particle and lodestone granule；Described activating agent includes oleic acid, linoleic acid and olive oil；Described liquid phase
Carrier fluid includes water, kerosene and ethanol.
4. according to the refractometry device according to any one of claims 1 to 3, it is characterised in that described housing is non-magnetic
Property housing.
Refractometry device the most according to claim 4, it is characterised in that described housing includes glass shell, pottery
Housing, plastic casing or resin-case.
Refractometry device the most according to claim 4, it is characterised in that described inner walls has light-absorption layer.
Refractometry device the most according to claim 6, it is characterised in that described field generator for magnetic includes solenoid
With the adjustable DC constant current source for powering to described solenoid；Described housing is positioned at the solenoid of described field generator for magnetic
In.
Refractometry device the most according to claim 7, it is characterised in that described optical receiver at least two.
9. the refractive index measurement method being applied to refractometry device described in claim 1, it is characterised in that including:
Receive the light acceptance amount information of described optical receiver, when light acceptance amount reaches the light acceptance amount threshold value set, it is determined that institute
State incident ray and there occurs total reflection；
Obtain described incident ray and critical magnetic field strength corresponding when being totally reflected occurs；
Critical magnetic field strength during total reflection is occurred to determine magnetic fluid refractive index according to described incident ray；
According to magnetic fluid refractive index and setting angle, determining the refractive index of measured sample, the described angle that sets is as described reflection
Light and the angle of incident ray.
10. the apparatus for measuring refractive index being applied to refractometry device described in claim 1, it is characterised in that including:
Total reflection identifying unit, for receiving the light acceptance amount information of described optical receiver, when light acceptance amount reaches the light of setting
During reception amount threshold value, it is determined that described incident ray there occurs total reflection；
Acquiring unit, for obtaining critical magnetic field strength when described incident ray occurs total reflection；
First determines unit, for occurring critical magnetic field strength during total reflection to determine the magnetic current of correspondence according to described incident ray
Body refractive index；
Second determines unit, for according to magnetic fluid refractive index and set angle, determine the refractive index of measured sample, described in set
Clamp angle is the angle of described reflection light and incident ray.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610589278.6A CN106290254B (en) | 2016-07-22 | 2016-07-22 | A kind of refractometry device, refractive index measurement method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610589278.6A CN106290254B (en) | 2016-07-22 | 2016-07-22 | A kind of refractometry device, refractive index measurement method and device |
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| CN106290254A true CN106290254A (en) | 2017-01-04 |
| CN106290254B CN106290254B (en) | 2018-10-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107092127A (en) * | 2017-07-06 | 2017-08-25 | 京东方科技集团股份有限公司 | A kind of adjustable refractive index structure, color membrane substrates, display panel and display device |
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| US20030193663A1 (en) * | 2002-04-16 | 2003-10-16 | Hong Chin-Yih Rex | Method for designing and tuning and system for measuring a refractive index of a magnetic fluid |
| CN201141836Y (en) * | 2007-10-09 | 2008-10-29 | 明琦翔 | Liquid refractive index measurement box |
| CN101303423A (en) * | 2008-03-27 | 2008-11-12 | 上海理工大学 | Magnetofluid grating |
| CN103119420A (en) * | 2010-09-16 | 2013-05-22 | 夏普株式会社 | Refractive index measuring device, and refractive index measuring method |
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| DE3634244A1 (en) * | 1986-10-08 | 1988-04-21 | Telefunken Electronic Gmbh | Optoelectronic inclination sensor |
| CN1275201A (en) * | 1997-07-31 | 2000-11-29 | 莱卡微系统公司 | Brake check handheld refractometer |
| US20030193663A1 (en) * | 2002-04-16 | 2003-10-16 | Hong Chin-Yih Rex | Method for designing and tuning and system for measuring a refractive index of a magnetic fluid |
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| CN101303423A (en) * | 2008-03-27 | 2008-11-12 | 上海理工大学 | Magnetofluid grating |
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| US11249331B2 (en) | 2017-07-06 | 2022-02-15 | Boe Technology Group Co., Ltd. | Refractive index adjustment structure, color filter substrate, display panel and display apparatus |
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|---|---|
| CN106290254B (en) | 2018-10-30 |
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