CN117054339A - Focal plane division type polarization imaging device based on liquid crystal microarray device - Google Patents
Focal plane division type polarization imaging device based on liquid crystal microarray device Download PDFInfo
- Publication number
- CN117054339A CN117054339A CN202311065688.7A CN202311065688A CN117054339A CN 117054339 A CN117054339 A CN 117054339A CN 202311065688 A CN202311065688 A CN 202311065688A CN 117054339 A CN117054339 A CN 117054339A
- Authority
- CN
- China
- Prior art keywords
- liquid crystal
- polarization
- focal plane
- microarray
- film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 132
- 230000010287 polarization Effects 0.000 title claims abstract description 111
- 238000002493 microarray Methods 0.000 title claims abstract description 85
- 238000003384 imaging method Methods 0.000 title claims abstract description 39
- 238000001514 detection method Methods 0.000 claims abstract description 45
- 239000011521 glass Substances 0.000 claims abstract description 33
- 239000000758 substrate Substances 0.000 claims abstract description 19
- 125000006850 spacer group Chemical group 0.000 claims abstract description 16
- 230000001681 protective effect Effects 0.000 claims abstract description 11
- 238000005259 measurement Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 14
- 230000003287 optical effect Effects 0.000 claims description 14
- 238000005516 engineering process Methods 0.000 claims description 10
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims description 7
- 239000004698 Polyethylene Substances 0.000 claims description 7
- 229910052740 iodine Inorganic materials 0.000 claims description 7
- 239000011630 iodine Substances 0.000 claims description 7
- -1 polyethylene Polymers 0.000 claims description 7
- 229920000573 polyethylene Polymers 0.000 claims description 7
- 239000011324 bead Substances 0.000 claims description 6
- 230000006872 improvement Effects 0.000 claims description 6
- 230000004927 fusion Effects 0.000 claims description 5
- 230000005684 electric field Effects 0.000 claims description 4
- 230000006870 function Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000004988 Nematic liquid crystal Substances 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 claims 1
- 238000012634 optical imaging Methods 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 description 6
- 230000008033 biological extinction Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- 238000005530 etching Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 210000004556 brain Anatomy 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 210000002858 crystal cell Anatomy 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000008447 perception Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000013598 vector Substances 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- DMLAVOWQYNRWNQ-UHFFFAOYSA-N azobenzene Chemical compound C1=CC=CC=C1N=NC1=CC=CC=C1 DMLAVOWQYNRWNQ-UHFFFAOYSA-N 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000006059 cover glass Substances 0.000 description 1
- 238000011840 criminal investigation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000028161 membrane depolarization Effects 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- 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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- 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
- G01N21/21—Polarisation-affecting properties
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133707—Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Optics & Photonics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Nonlinear Science (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Mathematical Physics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal (AREA)
Abstract
The invention discloses a focal plane-splitting type polarization imaging device based on a liquid crystal microarray device, which relates to the technical field of optical imaging, and comprises a detector focal plane, a polaroid, a phase compensation plate, the liquid crystal microarray device, protective glass and a liquid crystal driver; the liquid crystal microarray device comprises a first glass substrate, a first transparent conductive film, a first dielectric film, a first orientation film, a spacer layer, a second orientation film, a second dielectric film, a second transparent conductive film and a second glass substrate which are sequentially arranged; the polaroid is matched with the liquid crystal microarray device and the focal plane of the detector to jointly finish the measurement of the polarization parameters of the detection light beam; the phase compensation plate is associated with the phase delay amount of the liquid crystal micro array device and is used for eliminating the residual phase difference of the liquid crystal micro array device; the liquid crystal driver is used for realizing the fast switching between the multi-parameter polarization detection mode and the non-polarization detection mode of the polarization imaging device in an electric control mode. The invention realizes the polarization real-time characteristic detection capability corresponding to the pixel scale of the detection target.
Description
The invention discloses a division application of a focal plane division type polarization imaging device based on a liquid crystal microarray device, wherein the application number of the mother application is 202011338046.6, and the application date is 2020.11.25.
Technical Field
The invention relates to the technical field of optical imaging, in particular to a focal plane division type polarization imaging device based on a liquid crystal microarray device.
Background
Human perception of the objective world is based on signals related to the transmission of sensors to the human brain, and advances in experimental science over centuries have greatly expanded the ability and scope of human perception of the objective world. The human visual system plays a critical role in the transmission of numerous sensor signals to the human brain. The human eye vision system can sense the wavelength and intensity variation of light within a certain range, but the wavelength and intensity are only a part of the basic characteristics of light waves, and even in the visible light range, the human eye vision system can only sense partial information of the outside world, wherein polarization information carried by the light cannot be sensed by human eyes.
Polarization is an important feature of electromagnetic waves, and is another important attribute of information carried by light, besides wavelength, amplitude, and phase. According to the Fresnel reflection law and the Kill Huo Fure radiation theory, any object on the earth surface and in the atmosphere can generate special polarization characteristics determined by the properties of the object and the fundamental optical law in the process of transmitting, scattering, transmitting and radiating electromagnetic waves, and polarization information of different objects or different states of the same object can have certain difference. The polarization imaging system images the target by controlling parameters such as the polarization state of incident light, and important characteristics and marks of the polarization imaging system can acquire polarization information, intensity information and space information of the target at the same time to form a data cube containing light intensity, polarization and position information of the target. The high-resolution polarization imaging device can realize complementary advantages of a polarization imaging technology and a light intensity imaging technology, effectively increase information quantity of optical detection, complete boundary extraction and feature recognition of a target under a complex background, realize multi-mode information fusion of optical imaging, enable the invisible target to be visible under a common imaging system, and promote rapid development of information technology. The method has important application value and wide application prospect in the fields of aviation remote sensing detection, agricultural meteorological and flood emergency monitoring, environmental protection monitoring, criminal investigation material evidence identification, target detection and the like.
The conventional polarization modulation mode mainly comprises a mechanical rotation type, an amplitude division type, a wave division front type, a focal plane division type and an electric control modulation type of a polaroid, wherein the mechanical rotation type and the electric control modulation type belong to time domain polarization modulation modes, and the amplitude division type, the wave division front type and the focal plane division type belong to space domain polarization modulation modes. The polarizing elements are integrated on a focal plane by a focal plane division type, 1 pixel of the focal plane corresponds to 1 micro-polarizing element, a layer of micro-nano structure polarizing array is processed or stuck on the focal plane of the imaging detector, and each 4 pixels are 1 group and are respectively sensitive to polarization vectors in different directions. In the process of polarization imaging calculation, the response of the current pixel and surrounding pixels is utilized to directly or indirectly obtain polarization components or polarization states of the pixel in different directions, so that Stokes vectors are calculated, and the polarization imaging calculation is completed. The focal plane splitting method can acquire polarization components or polarization states of incident light in different directions simultaneously, so that static scene imaging and dynamic scene imaging can be realized, and the focal plane splitting method is compact in structure and small in size, is a research hotspot of current polarization imaging, and is also the main flow direction of future polarization imaging.
The prior focal plane type polarization microarray device is mainly prepared by multi-working layered etching micro-nano processing based on an iodine-containing polyethylene film polaroid and a metal grating polaroid, and has the technical advantages of high extinction ratio, high stability and the like, but has a certain obstruction to market popularization of the product due to the technical defects of complex preparation process, high preparation cost, deliquescence and depolarization, constraint on structural size by diffraction limit, poor technical portability and the like.
Zhao et al at the university of hong kong science and technology in china and Myhre et al at the university of arizona in the united states (2012) proposed uv non-contact photoalignment techniques to induce the alignment of dichroic fuels in guest-host liquid crystals, thereby producing high resolution "guest-host" micro-polarizer arrays. The micro-polarizer array has the technical advantages of simple preparation process, stable performance and the like, and has good technical portability and market popularization potential. However, at the same time, the method has high requirements on dichroism materials, and has limited extinction ratio and working band.
In summary, the existing focal plane type polarized micro array device based on the iodine-containing polyethylene film polaroid and the metal grating polaroid has higher preparation cost and poorer technical portability, and the extinction ratio and the working band of the guest-host type liquid crystal micro polaroid array device are limited.
Disclosure of Invention
The invention aims to provide a focal plane-division type polarization imaging device based on a liquid crystal microarray device, which realizes the polarization real-time characteristic detection capability corresponding to the dimension of a detection target pixel and can realize the rapid switching between a multi-parameter polarization detection mode and a non-polarization detection mode.
In order to achieve the above object, the present invention provides the following solutions:
a focal plane-splitting type polarization imaging device based on a liquid crystal microarray device comprises a detector focal plane, a polaroid, a phase compensation plate, the liquid crystal microarray device, protective glass and a liquid crystal driver; the detector focal plane, the polaroid, the phase compensation plate, the liquid crystal microarray device and the protective glass are sequentially arranged, and the liquid crystal microarray device is electrically connected with the liquid crystal driver;
the liquid crystal microarray device comprises a first glass substrate, a first transparent conductive film, a first dielectric film, a first orientation film, a spacer layer, a second orientation film, a second dielectric film, a second transparent conductive film and a second glass substrate which are sequentially arranged; the spacer layer comprises a first spacer device, a liquid crystal layer and a second spacer device which are sequentially arranged from top to bottom; the transparent conductive film is connected with the multichannel driving source through the electrode to provide an electric field for the liquid crystal layer, so that the rotation direction of liquid crystal molecules is changed, and the polarization modulation state of incident light is controlled; the dielectric film is used for optical refractive index matching; the alignment direction of the alignment film induces the liquid crystal molecules in the liquid crystal layer to be arranged according to a specific direction, so that the liquid crystal microarray device has optical rotation characteristics; the thickness of the liquid crystal layer is controlled by a spacing device;
the polaroid is matched with the liquid crystal microarray device and the focal plane of the detector to jointly finish the measurement of the polarization parameters of the detection light beam; the phase compensation plate is associated with the phase delay amount of the liquid crystal micro array device and is used for eliminating the residual phase difference of the liquid crystal micro array device; the liquid crystal microarray device is subjected to pixel matching with the focal plane of the detector, 1 pixel of the focal plane of the detector corresponds to 1 microarray element, and each 4 pixels are in a group to respectively detect polarization information in different directions; the protective glass is used for guaranteeing the internal environment of the whole device; the liquid crystal driver is used for realizing fast switching between a multi-parameter polarization detection mode and a non-polarization detection mode of the polarization imaging device in an electric control mode.
Optionally, the phase compensation plate is an iodine-containing polyethylene film polarizer injected with a liquid crystal material, so as to realize dual functions of phase compensation and polarization detection.
Optionally, the liquid crystal microarray device realizes the alignment of the alignment film microarray matched with the pixel size of the focal plane of the detector by using an alignment film photo-induced alignment technology, and the twisted liquid crystal molecular long axis forms a preset liquid crystal microarray under the action of two layers of alignment films, so that the polarization azimuth angle regulation corresponding to the pixel size of the incident light beam is realized, and the measurement of the polarization parameters of the incident light beam is further realized.
Optionally, the liquid crystal layer is formed by pouring a nematic liquid crystal material between the first glass substrate and the second glass substrate.
Alternatively, the liquid crystal material employs a mixture having a predetermined concentration of chiral molecules having an optically active property and liquid crystals having a birefringent property.
Optionally, the spacer means is glass fiber, glass beads or plastic beads.
Optionally, the device adopts a bilinear interpolation method of pixel groups to improve the detection resolution, namely, each group of detection units is divided into original 4 pixels again, and then the bias component missing from each pixel is obtained through weighted average fusion of the pixels in the field, so that the improvement of the image resolution is realized.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a focal plane division type polarization imaging device based on a liquid crystal microarray device, which comprises a detector focal plane, a polaroid, a phase compensation plate, the liquid crystal microarray device, protective glass and a liquid crystal driver; the liquid crystal microarray device comprises a first glass substrate, a first transparent conductive film, a first dielectric film, a first orientation film, a spacer layer, a second orientation film, a second dielectric film, a second transparent conductive film and a second glass substrate which are sequentially arranged; the spacer layer comprises a first spacer device, a liquid crystal layer and a second spacer device which are sequentially arranged from top to bottom; the transparent conductive film is connected with the multichannel driving source through the electrode to provide an electric field for the liquid crystal layer, so that the rotation direction of liquid crystal molecules is changed, and the polarization modulation state of incident light is controlled; the dielectric film is used for optical refractive index matching; the alignment direction of the alignment film induces alignment of liquid crystal molecules in the liquid crystal layer in a specific direction, so that the liquid crystal microarray device has optical characteristics. The polaroid is matched with the liquid crystal microarray device and the focal plane of the detector to jointly finish the measurement of the polarization parameters of the detection light beam; the phase compensation plate is associated with the phase delay amount of the liquid crystal micro array device and is used for eliminating the residual phase difference of the liquid crystal micro array device; performing pixel matching on the liquid crystal microarray device and a detector focal plane, wherein 1 pixel of the detector focal plane corresponds to 1 microarray element, and each 4 pixels are in a group to respectively detect polarization information in different directions; the liquid crystal driver is used for realizing the fast switching between the multi-parameter polarization detection mode and the non-polarization detection mode of the polarization imaging device in an electric control mode.
The invention forms an integral device through the components, so as to solve the technical problems of high preparation cost, poor technical portability, and limited extinction ratio and working wave band of the traditional focal plane splitting type polarization microarray device. Compared with other iodine polyethylene film polaroid and metal grating polaroid-based focal plane type polarization microarray chips prepared by adopting multi-step layered etching micro-nano processing technology, the device provided by the invention has the technical advantages of low preparation cost, stable performance, wide application range and the like; compared with a guest-host type liquid crystal micro-polarizer array chip, the chip provided by the invention has the technical advantages of wide working wave band, high extinction ratio and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a focal plane-splitting type polarization imaging device based on a liquid crystal microarray device according to the present invention.
FIG. 2 is a schematic diagram of a liquid crystal microarray device according to the present invention.
FIG. 3 is a schematic diagram showing the alignment of the upper and lower alignment films of the liquid crystal microarray device of the present invention.
FIG. 4 is a schematic diagram showing the molecular twist direction of a liquid crystal cell of a liquid crystal microarray device of the present invention.
FIG. 5 is a schematic diagram of a micro-array interpolation model according to the present invention.
Symbol description:
101-detector focal plane, 102-polarizer, 103-phase compensation plate, 104-liquid crystal microarray device, 105-cover glass, 106-liquid crystal driver, 201-glass substrate, 202-conductive film, 203-dielectric film, 204-alignment film, 205-spacer, 206-liquid crystal layer.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Compared with other iodine polyethylene film polaroid and metal grating polaroid-based focal plane type polarization microarray devices prepared by adopting multi-step etching micro-nano processing technology, the embodiment provides a focal plane type polarization imaging device based on a liquid crystal microarray device, which is low in manufacturing cost and wide in working band, and can realize the polarization real-time characteristic detection capability corresponding to the detection target pixel scale in the visible-infrared band range and realize the rapid switching between a multi-parameter polarization detection mode and a non-polarization detection mode.
As shown in fig. 1, the focal plane splitting polarization imaging device of the present embodiment can implement a real-time detection function, and the hardware structure of the focal plane splitting polarization imaging device mainly includes a protective glass 105, a liquid crystal microarray device 104, a phase compensation plate 103, a polarizer 102, and a detector focal plane 101, which are sequentially disposed. The liquid crystal microarray device and the detector focal plane are subjected to pixel matching, 1 pixel of the focal plane corresponds to 1 microarray element, each 4 pixels is 1 group, and polarization information in different directions is detected respectively; the phase compensation plate is used for eliminating residual phase difference of the liquid crystal micro array device; the fast axis direction of the polaroid can be set to be parallel or perpendicular to the side length of the focal plane pixel, and the polarization Stokes parameter measurement of the detection light beam is completed together by matching with the liquid crystal microarray device and the focal plane component of the detector; the protective glass is positioned at the forefront end of the device and used for guaranteeing the internal environments such as dryness, cleanliness and the like of the whole device.
The performance of the phase compensation plate needs to be related to the amount of phase retardation of the liquid crystal microarray device to eliminate residual phase differences of the liquid crystal microarray device. The phase compensation plate may employ a performance matching quartz wave plate or other birefringent material. In the embodiment, the phase compensation plate adopts an iodine-containing polyethylene film polaroid injected with a liquid crystal material, and simultaneously realizes the dual functions of phase compensation and polarization detection.
The split focal plane type polarization imaging device of the present embodiment can realize fast switching between the multi-parameter polarization detection mode and the non-polarization detection mode by providing the liquid crystal driver 106. The liquid crystal driver is used for controlling the working state of the liquid crystal micro array device and can realize the fast switching between the multi-parameter polarization detection mode and the non-polarization detection mode of the chip in an electrically controlled manner.
The polarization focal plane imaging device of the embodiment is based on a liquid crystal microarray device, and the liquid crystal microarray device is mainly characterized in that modulation of polarization directions of incident light is achieved based on a twisted liquid crystal device, a twisted liquid crystal molecular long axis forms a preset liquid crystal microarray under the action of two layers of alignment films, polarization azimuth angle regulation corresponding to pixel dimensions of an incident light beam is achieved, and measurement of polarization parameters of the incident light beam is further achieved. The whole liquid crystal micro array device mainly comprises two layers of glass substrates plated with transparent conductive films and dielectric films, an upper layer of orientation film, a lower layer of orientation film, a spacing device and a liquid crystal layer.
As shown in fig. 2 in particular, the liquid crystal microarray device of the present embodiment includes a glass substrate 201, a transparent conductive film 202, a dielectric film 203, an alignment film 204, a spacer 205, and a liquid crystal layer 206.
The transparent conductive film is prepared on the inner surface of the glass substrate, and is connected with the multichannel driving source through the electrode to provide an electric field for the liquid crystal layer, so that the rotation direction of liquid crystal molecules is changed, and the polarization modulation state of incident light is controlled. The dielectric film is positioned between the transparent conductive film and the orientation film, is mainly used for optical refractive index matching, and can prevent the electric leakage effect caused by structural defects. The alignment films are coated on the dielectric films, and the alignment directions of the upper alignment film and the lower alignment film can induce the liquid crystal molecules in the liquid crystal layer to be arranged in a specific direction, so that the liquid crystal microarray device has optical rotation characteristics; the liquid crystal layer is formed by pouring nematic liquid crystal material between glass substrates, and the adopted liquid crystal material is a mixture with certain concentration, wherein the mixture is composed of chiral molecules with optical rotation property and liquid crystal with birefringence property; the thickness of the liquid crystal layer is controlled by a spacing device, and the spacing device can be glass fiber, glass beads or plastic beads. Specifically, when the surface quality of the transparent electrode film satisfies the device performance, the dielectric film layer may be omitted; the transparent conductive film layer may be omitted if the inventive chip does not require polarization modulation and non-polarization modulation state switching.
As shown in fig. 3, the alignment film on the glass substrate near one side of the protective glass is horizontally aligned with respect to the side length of the focal plane pixel, and the alignment film on the glass substrate on the other side is aligned with the focal plane pixel by using a photo-alignment technology, wherein each 4 units is 1 group, and the included angles of the photo-induced alignment directions of the 4 units in each group with respect to the side length of the focal plane pixel are respectively but not limited to 0 degree, 45 degrees, 90 degrees and 135 degrees.
In order to realize the microarray orientation of the device, one side of the overall horizontal orientation can be selected from a conventional mechanical friction orientation film or a photoinduced orientation film, the other side of the overall horizontal orientation is selected from a photo-control orientation film, and the microarray orientation of the orientation film can be realized by utilizing a digital mask or a mechanical mask photo-alignment technology. In this embodiment, the photo-alignment material is azobenzene material SDl, and the mechanical mask plate is used to realize photo-induced alignment of the microarray alignment film.
The polarization focal plane imaging device of the embodiment realizes the improvement of the detection resolution of the chip by using an interpolation method of the pixel group. The focal plane-splitting type polarization detection chip can acquire polarization components or polarization states of incident light in different directions at the same time, so that static scenes can be imaged and dynamic scenes can be imaged, but correspondingly, 4 pixels of the corresponding chip are combined into 1 group of units for detection, and the image resolution is reduced by 3/4. The detection resolution of the chip is improved by adopting, but not limited to, a bilinear interpolation method of pixel groups, namely, each group of detection units is divided into original 4 pixels again, and then the polarization component missing from each pixel can be obtained through weighted average fusion of neighborhood pixels, so that the improvement of the image resolution is realized.
Specifically, as shown in fig. 4, the liquid crystal molecules in the liquid crystal cells of the liquid crystal microarray device are respectively rotated by different angles under the induction of the alignment films. When the incident light enters the liquid crystal unit module, the polarization direction of the incident light is driven by the spiral structure of the liquid crystal molecules to realize different degrees of optical rotation. In this embodiment, the long axis directions of the liquid crystal molecules in 4 units in each group are rotated by 0 degrees, 45 degrees, 90 degrees and 135 degrees, respectively, and the polarization directions of the incident light are rotated by 0 degrees, 45 degrees, 90 degrees and 135 degrees, respectively. If the polarization direction of the rear polaroid is set to 90 degrees, the light intensity respectively passes through 0 degree, 45 degrees, 90 degrees and 135 degrees of optical rotation and the polaroids in each group, and the light intensity value obtained by the detector is I 0 、I 45 、I 90 And I 135 The polarization stokes parameter (I, Q, U) and the degree of polarization DoP and the polarization angle AoP of the light in each group are calculated according to the following formulas:
Q＝I 0 -I 90
U＝I 45 -I 135 (1)
in the focal plane splitting type polarization detection device of the embodiment, 4 pixels of the corresponding chip are combined into 1 group of units for detection, so that the image resolution is reduced by 3/4. The detection resolution of the chip is improved by adopting, but not limited to, a bilinear interpolation method of pixel groups, namely, each group of detection units is divided into original 4 pixels again, and then the polarization component missing from each pixel can be obtained through weighted average fusion of neighborhood pixels, so that the improvement of the image resolution is realized.
As shown in fig. 5, in the schematic illustration of the micro-array interpolation model, a bilinear interpolation method is selected to achieve image resolution improvement, taking the pixel unit of No. 6 as an example, the corresponding polarization modulation component can be interpolated by the following formula, and then the polarization parameter of the incident light corresponding to the pixel of No. 6 can be completed according to the formula (1).
I 135 (6)＝I(6)
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (7)
1. The focal plane splitting type polarization imaging device based on the liquid crystal microarray device is characterized by comprising a detector focal plane, a polaroid, a phase compensation plate, the liquid crystal microarray device, protective glass and a liquid crystal driver; the detector focal plane, the polaroid, the phase compensation plate, the liquid crystal microarray device and the protective glass are sequentially arranged, and the liquid crystal microarray device is electrically connected with the liquid crystal driver;
the liquid crystal microarray device comprises a first glass substrate, a first transparent conductive film, a first dielectric film, a first orientation film, a spacer layer, a second orientation film, a second dielectric film, a second transparent conductive film and a second glass substrate which are sequentially arranged; the spacer layer comprises a first spacer device, a liquid crystal layer and a second spacer device which are sequentially arranged from top to bottom; the transparent conductive film is connected with the multichannel driving source through the electrode to provide an electric field for the liquid crystal layer, so that the rotation direction of liquid crystal molecules is changed, and the polarization modulation state of incident light is controlled; the dielectric film is used for optical refractive index matching; the alignment direction of the alignment film induces the liquid crystal molecules in the liquid crystal layer to be arranged according to a specific direction, so that the liquid crystal microarray device has optical rotation characteristics; the thickness of the liquid crystal layer is controlled by a spacing device;
the polaroid is matched with the liquid crystal microarray device and the focal plane of the detector to jointly finish the measurement of the polarization parameters of the detection light beam; the phase compensation plate is associated with the phase delay amount of the liquid crystal micro array device and is used for eliminating the residual phase difference of the liquid crystal micro array device; the liquid crystal microarray device is subjected to pixel matching with the focal plane of the detector, 1 pixel of the focal plane of the detector corresponds to 1 microarray element, and each 4 pixels are in a group to respectively detect polarization information in different directions; the protective glass is used for guaranteeing the internal environment of the whole device; the liquid crystal driver is used for realizing fast switching between a multi-parameter polarization detection mode and a non-polarization detection mode of the polarization imaging device in an electric control mode.
2. The focal plane-splitting type polarization imaging device based on the liquid crystal microarray device according to claim 1, wherein the phase compensation plate is an iodine-containing polyethylene film polarizer injected with a liquid crystal material, so as to realize the dual functions of phase compensation and polarization analysis.
3. The focal plane-splitting type polarization imaging device based on the liquid crystal microarray device according to claim 1, wherein the liquid crystal microarray device realizes the microarray alignment of an alignment film matched with the size of a focal plane pixel of the detector by using an alignment film photo-alignment technology, and a twisted liquid crystal molecular long axis forms a preset liquid crystal microarray under the action of two layers of alignment films, so that the adjustment and control of a polarization azimuth angle corresponding to the pixel size of an incident beam are realized, and further the measurement of the polarization parameter of the incident beam is realized.
4. A focal plane-type polarization imaging device based on a liquid crystal microarray device according to claim 1, wherein the liquid crystal layer is formed by pouring a nematic liquid crystal material between a first glass substrate and a second glass substrate.
5. The focal plane-splitting polarization imaging device based on liquid crystal microarray device according to claim 1, wherein the liquid crystal material is a mixture of chiral molecules having optical rotation properties and liquid crystals having birefringence characteristics, which has a predetermined concentration.
6. The focal plane-splitting polarization imaging device based on liquid crystal microarray device according to claim 1, wherein the spacer means is glass fiber, glass bead or plastic bead.
7. The focal plane-splitting polarization imaging device based on the liquid crystal microarray device according to claim 1, wherein the device adopts a pixel group bilinear interpolation method to improve the detection resolution, namely, each group of detection units is divided into original 4 pixels again, and then the bias component missing from each pixel is obtained through weighted average fusion of the field pixels, so that the improvement of the image resolution is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311065688.7A CN117054339A (en) | 2020-11-25 | 2020-11-25 | Focal plane division type polarization imaging device based on liquid crystal microarray device |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011338046.6A CN112129704A (en) | 2020-11-25 | 2020-11-25 | Focus-dividing planar polarization imaging device based on liquid crystal microarray device |
| CN202311065688.7A CN117054339A (en) | 2020-11-25 | 2020-11-25 | Focal plane division type polarization imaging device based on liquid crystal microarray device |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011338046.6A Division CN112129704A (en) | 2020-11-25 | 2020-11-25 | Focus-dividing planar polarization imaging device based on liquid crystal microarray device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117054339A true CN117054339A (en) | 2023-11-14 |
Family
ID=73852303
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011338046.6A Pending CN112129704A (en) | 2020-11-25 | 2020-11-25 | Focus-dividing planar polarization imaging device based on liquid crystal microarray device |
| CN202311065688.7A Pending CN117054339A (en) | 2020-11-25 | 2020-11-25 | Focal plane division type polarization imaging device based on liquid crystal microarray device |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011338046.6A Pending CN112129704A (en) | 2020-11-25 | 2020-11-25 | Focus-dividing planar polarization imaging device based on liquid crystal microarray device |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN112129704A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114414052A (en) * | 2022-01-21 | 2022-04-29 | 中国科学院长春光学精密机械与物理研究所 | Polarization intensity dual-mode imaging system based on twisted liquid crystal array |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2861187B2 (en) * | 1990-01-30 | 1999-02-24 | ソニー株式会社 | Polarization conversion element for light source |
| CN100353216C (en) * | 2005-08-30 | 2007-12-05 | 中国工程物理研究院流体物理研究所 | Chiral liquid crystal depolarizer and its preparing method |
| CN101520565A (en) * | 2009-01-09 | 2009-09-02 | 中国工程物理研究院流体物理研究所 | Quick-response liquid crystal optical switch and preparation method thereof |
| CN101893731B (en) * | 2009-05-21 | 2016-11-23 | 香港科技大学 | Micro-polarization analyzer array based on photo orientated liquid crystal and preparation method thereof |
| CN101793559B (en) * | 2010-03-18 | 2012-04-18 | 西安交通大学 | Light and small interference imaging spectrum full-polarized detection device |
| CN203572768U (en) * | 2013-12-09 | 2014-04-30 | 中国工程物理研究院流体物理研究所 | Crystal liquid birefraction effect-based high-resolution polarization spectrum imaging system |
| CN105022164A (en) * | 2015-08-20 | 2015-11-04 | 中国工程物理研究院流体物理研究所 | Birefringent prism based beam scanning angle amplifier |
| CN108206902B (en) * | 2016-12-16 | 2020-09-22 | 深圳超多维科技有限公司 | Light field camera |
| CN108267896A (en) * | 2016-12-30 | 2018-07-10 | 深圳超多维光电子有限公司 | polarization imaging device and method |
| CN108489614A (en) * | 2018-03-08 | 2018-09-04 | 中国科学院光电技术研究所 | Compact-structure type full-Stokes vector polarization imaging device based on double-adhesive digital coding birefringent crystal slice |
| CN109164529A (en) * | 2018-09-27 | 2019-01-08 | 西北工业大学 | The micro- polarization chip arrays and its imaging device of high sampling rate real-time polarization imaging |
| CN110849484B (en) * | 2019-10-28 | 2021-03-26 | 西北工业大学 | Extinction ratio testing device and method for infrared polarization camera with split-focus plane |
| CN111103739A (en) * | 2019-12-31 | 2020-05-05 | 中国工程物理研究院流体物理研究所 | Electric control zoom plane lens |
-
2020
- 2020-11-25 CN CN202011338046.6A patent/CN112129704A/en active Pending
- 2020-11-25 CN CN202311065688.7A patent/CN117054339A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN112129704A (en) | 2020-12-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9835885B2 (en) | Systems, methods, and apparatus for sensitive thermal imaging | |
| Xin et al. | Dual-polarized light-field imaging micro-system via a liquid-crystal microlens array for direct three-dimensional observation | |
| Zhao et al. | High-resolution thin “guest-host” micropolarizer arrays for visible imaging polarimetry | |
| CN101910930B (en) | Device and method for reducing optical blurring | |
| CN108700702A (en) | Transmission-variable film | |
| US20200026111A1 (en) | In-plane switching mode liquid crystal display device and display device | |
| CN108489614A (en) | Compact-structure type full-Stokes vector polarization imaging device based on double-adhesive digital coding birefringent crystal slice | |
| CN101097300B (en) | Sample of orienting directional axis for measuring LCD | |
| CN113375800A (en) | Adjustable optical filter based on optical super-surface and spectral imaging system | |
| CN117054339A (en) | Focal plane division type polarization imaging device based on liquid crystal microarray device | |
| CN107153290A (en) | Display panel and display device using same | |
| CN107121803A (en) | Display panel and display device using same | |
| CN102096203B (en) | Method and polaroid for viewing movie by three-dimensional polaroid glasses at optional angle | |
| JP2023513723A (en) | Optics for Integrated IR, Visible Cameras for Depth Sensing, and Systems Incorporating Them | |
| CN101802689B (en) | Composite retardation plate, and optical compensation polarizing plate and liquid crystal display device equipped with composite retardation plate | |
| US20210223107A1 (en) | Polarized light 3d image measuring instrument and manufacturing method thereof | |
| KR101398556B1 (en) | Transflective type liquid crystal display device | |
| KR20150071413A (en) | Liquid crystal display apparatus | |
| CN112082652A (en) | Integrated array type polarization imaging detector with multilayer transparent black phosphorus sheet stacking and corresponding polarization information calculation method | |
| CN214951800U (en) | Adjustable optical filter based on optical super surface and spectral imaging system | |
| Wu et al. | Infrared liquid crystal light valve | |
| Choi et al. | Omnidirectionally continuous liquid crystal domain structure for high transmittance vertically aligned nematic mode | |
| CN114414052A (en) | Polarization intensity dual-mode imaging system based on twisted liquid crystal array | |
| Ye et al. | Design of polarimetric camera based on the single-layer twisted nematic liquid crystal device | |
| Huang et al. | Research on Large Aperture Liquid Crystal Lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |