WO2019039486A1 - Dispositif de capture d'image de polarisation - Google Patents

Dispositif de capture d'image de polarisation Download PDF

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WO2019039486A1
WO2019039486A1 PCT/JP2018/030902 JP2018030902W WO2019039486A1 WO 2019039486 A1 WO2019039486 A1 WO 2019039486A1 JP 2018030902 W JP2018030902 W JP 2018030902W WO 2019039486 A1 WO2019039486 A1 WO 2019039486A1
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group
ring
carbon atoms
single bond
photoreactive
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PCT/JP2018/030902
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English (en)
Japanese (ja)
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盛嗣 坂本
浩平 野田
小野　浩司
喜弘 川月
皇晶 筒井
耕平 後藤
Original Assignee
国立大学法人長岡技術科学大学
公立大学法人兵庫県立大学
日産化学株式会社
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Application filed by 国立大学法人長岡技術科学大学, 公立大学法人兵庫県立大学, 日産化学株式会社 filed Critical 国立大学法人長岡技術科学大学
Priority to KR1020207007575A priority Critical patent/KR102645233B1/ko
Priority to JP2019537643A priority patent/JP7101356B2/ja
Priority to CN201880068721.2A priority patent/CN111247405B/zh
Publication of WO2019039486A1 publication Critical patent/WO2019039486A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L101/00—Compositions of unspecified macromolecular compounds
    • C08L101/02—Compositions of unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/28—Investigating the spectrum
    • G01J3/447—Polarisation spectrometry
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J4/00—Measuring polarisation of light
    • G01J4/04—Polarimeters using electric detection means
    • 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
    • G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B11/00—Filters or other obturators specially adapted for photographic purposes

Definitions

  • the present invention relates to a polarization imaging apparatus having an anisotropic diffraction grating.
  • the most representative polarization measurement methods are a rotating analyzer method and a rotating retarder method that use rotating polarizers and wave plates.
  • a time waveform of light intensity corresponding to the polarization state of the incident light is observed while rotating the polarization element.
  • the obtained time waveform is subjected to Fourier analysis to restore the Stokes parameter information.
  • This method has a long history of research and is characterized by various error reductions and high measurement accuracy.
  • this method in order to acquire information necessary for restoration of Stokes parameters in multiple times while rotating the polarization element temporally, this method is not suitable for an object whose polarization state changes temporally. is there.
  • the necessity of measuring the polarization state of a dynamic object is extremely high, and polarization spatial distribution measurement in snapshot is required.
  • the position of the array of the light receiving elements and the array of the polarizing elements need to be accurately aligned, and the fabrication is not easy.
  • the discontinuity of the phase difference that occurs at the boundary of the polarizing element array may cause diffracted light that is undesirable for measurement.
  • Non-patent Document 3 Another example of prior work enabling polarization imaging with snapshots is an imaging polarimeter using a polarization Savart plate that utilizes spatial carriers during polarization interference.
  • this method the influence of diffraction as in the array element described above does not occur.
  • this method requires expensive optical elements such as a Savart plate, so that the cost is large.
  • a polarization imaging device having an anisotropic diffraction grating element, a lens element, and a light receiving element in which optical anisotropy is periodically modulated.
  • the anisotropic diffraction grating element has an anisotropic diffraction grating having a plurality of grating vectors different from each other, and the grating vector has at least an anisotropic orientation or a birefringence. It should be periodically modulated.
  • the anisotropic diffraction grating element spatially separates the information of the Stokes parameter of the incident light according to the distribution of the anisotropic direction and the birefringence, and the intensity information It is preferable to have an anisotropic diffraction grating that converts it into
  • the anisotropic diffraction grating device is at least one selected from the group consisting of (A-1) photocrosslinking and (A-2) photoisomerization. It is preferable to include an anisotropic diffraction grating having a photoreactive polymer film having a photoreactive side chain causing the reaction of ⁇ 5>
  • the anisotropic diffraction grating element preferably includes an anisotropic diffraction grating made of a photoreactive polymer film.
  • the anisotropic diffraction grating element is And I) a first transparent substrate layer; and II) a first photoreactive side chain which causes at least one reaction selected from the group consisting of (A-1) photocrosslinking, and (A-2) photoisomerization.
  • it includes an anisotropic diffraction grating having a first photoreactive polymer film.
  • the anisotropic diffraction grating element is And III) a second transparent substrate layer; and IV) a second photoreactive side chain which causes at least one reaction selected from the group consisting of (A-1) photocrosslinking, and (A-2) photoisomerization.
  • a second photoreactive polymer film having The II) first photoreactive polymer film and the IV) second photoreactive polymer film are disposed to face each other, and the II) first film and the IV) second film In between, it is preferable to include an anisotropic diffraction grating in which the low molecular weight liquid crystal layer is disposed.
  • the desired light polarization is interference-exposed on the photoreactive polymer film to form an arbitrary diffraction pattern on the polymer thin film.
  • the anisotropic diffraction grating element has an anisotropic diffraction grating with which diffraction efficiency of ⁇ 1st-order light is good.
  • a polarization imaging apparatus capable of performing polarization imaging measurement in a snapshot without requiring a mechanical operation unit, in particular, a polarization imaging apparatus which does not require highly accurate alignment of polarization elements, more particularly in cost aspect Can also provide a relatively inexpensive polarization imaging device.
  • FIG. 1 shows a schematic view of a multiple recording anisotropic diffraction grating.
  • I A ⁇ based on the diffraction properties of the PL grid
  • I B ⁇ a diagram showing the dependence of ⁇ amplitude ratio angle of the incident polarized light
  • I C ⁇ a diagram showing the dependence of ⁇ amplitude ratio angle of the incident polarized light
  • It is a figure explaining the composition of the polarization imaging device used in the example.
  • It is an image of the result of an imaging measurement using the polarization imaging device which used scarlet beetle as a to-be-photographed object and was used in the Example. From the image obtained in FIG. 5, the images of the ⁇ 1st light component (I ⁇ 1 ) and the + 1st light component (I +1 ) are extracted by image processing, and the difference image is calculated to obtain the imaging image of S 3 Show.
  • the present application provides a polarization imaging device comprising an anisotropic diffraction grating.
  • "Polarization” which is a property in which the locus of the electric field vector of the electromagnetic wave describes a bias, is widely used as one of the characteristics of the electromagnetic wave.
  • the polarization state of the electromagnetic wave changes, and the polarization change contains various information unique to the substance. That is, by measuring the polarization characteristic of the subject, it is possible to non-contact and nondestructively investigate information unique to the substance.
  • the polarization imaging apparatus can perform imaging measurement of a spatial distribution of Stokes parameters (parameters describing the polarization state) of scattered light from an object by snapshot.
  • the polarization imaging device of the present application has an anisotropic diffraction grating element, a lens element, and a light receiving element in which optical anisotropy is periodically modulated.
  • the lens element, the anisotropic diffraction grating element, and the light receiving element may be arranged in order from the object side. Other elements other than those described above may be arranged as desired.
  • the polarization imaging device of the present application has an anisotropic diffraction grating element whose optical anisotropy is periodically modulated.
  • the principle of Stokes parameter measurement using the anisotropic diffraction grating element will be described below.
  • the polarization state of the electromagnetic wave can be represented by a Stokes vector (S 0 , S 1 , S 2 , S 3 ) consisting of four elements.
  • each Stokes parameter is defined by the following equation (1).
  • the polarization characteristics of the subject can be clarified by finding these four elements from the intensity information of the light reflected, scattered and transmitted from the subject.
  • the polarization imaging apparatus of the present application is characterized in that the imaging measurement of these Stokes parameters is performed at one time of image acquisition.
  • the principle of polarization detection of this device is based on an anisotropic grating element whose optical anisotropy is modulated periodically.
  • the Jones matrix representing the induced anisotropy distribution is represented by the following formula (2).
  • ⁇ ⁇ nd / ⁇ , where ⁇ n is the maximum value of polarization induced birefringence, d is the film thickness of the recording material, and ⁇ is the wavelength of the diffracted light.
  • Equation (3) the Jones matrix component contributing to the ⁇ 1st-order diffraction is represented by the following Equation (3).
  • Equation (3) the intensity of the ⁇ 1-order diffracted light I PL ⁇ represented by the following formula (5) Is required. Therefore, it is understood that the diffracted light intensity of the anisotropic grating formed by PL recording strongly depends on the amplitude ratio angle ⁇ of the incident light.
  • the lattice is referred to as a PL lattice unless otherwise specified in the present application.
  • the diffracted light intensity of the anisotropic grating formed by the OC recording recorded by the OC interference depends on the phase difference of the incident light.
  • the grid is referred to as an OC grid for the sake of simplicity.
  • the anisotropic diffraction grating formed in the polarization recording material by polarization hologram recording exhibits diffraction characteristics depending on the incident polarization state. Therefore, polarization information of incident light can be spatially separated as intensity information. Therefore, the value of the Stokes parameter can be derived from the intensity information of each diffraction order light.
  • the Stokes parameter detector with four anisotropic gratings with different grating vectors superimposed.
  • FIG. 1 A schematic of the diffraction grating is shown in FIG.
  • This anisotropic diffraction grating is one in which four gratings A, B, C, D are multiplexed and recorded in a polarization recording material.
  • A, B, and C are PL lattices
  • D is an OC lattice
  • respective lattice vectors are arranged to form an angle of 45 degrees with each other.
  • m A, B, C, D, and I A + means the intensity of + 1st order light with respect to the lattice A.
  • I A ⁇ corresponding to PL grid, I B ⁇ , I C ⁇ is sinusoidally varies depending on ⁇ amplitude ratio angle of the incident light.
  • the dependence of the incident polarized light on the amplitude ratio angle ⁇ of I A ⁇ , I B ⁇ and I C ⁇ is shown in FIG. 2 based on the diffraction characteristics of the PL grating. It can be seen from FIG. 2 that when I B > (I A + I C ) / 2, the amplitude ratio angle is ⁇ ⁇ 0, and when ⁇ (I A + I C ) / 2, the amplitude ratio angle is ⁇ > 0. That is, the sign of the amplitude ratio angle ⁇ ⁇ ⁇ can be obtained from the magnitude of I B.
  • S 2 can be obtained by substituting the obtained amplitude ratio angle ⁇ and phase difference ⁇ into the above equation (1). Therefore, all elements of the Stokes parameter of the incident light can be determined from the diffracted lights I A , I B , I C and I D ⁇ from the anisotropic diffraction grating of FIG. In addition, if intensity information necessary for deriving a Stokes parameter can be obtained, measurement of the Stokes parameter is possible even with an anisotropic pattern different from the anisotropic diffraction grating of FIG.
  • the anisotropic grating element may have an anisotropic grating having a plurality of grating vectors different in direction from one another, and at least the anisotropic orientation or the birefringence of the grating vector may be periodically modulated.
  • the anisotropic diffraction grating element has an anisotropic diffraction grating that spatially separates information of the Stokes parameter of incident light according to the distribution of anisotropic orientation and birefringence, and converts it into intensity information. That's good.
  • the anisotropic diffraction grating element has an anisotropic diffraction grating with good diffraction efficiency of ⁇ 1st-order light.
  • an anisotropic grating element can be prepared as follows. That is, the anisotropic diffraction grating element has a photoreactive side chain having at least one kind of reaction selected from the group consisting of (A-1) photocrosslinking and (A-2) photoisomerization. It may include an anisotropic diffraction grating having a polymer film. In addition, the anisotropic diffraction grating element preferably includes an anisotropic diffraction grating made of a photoreactive polymer film.
  • the photoreactive polymer used for the photoreactive polymer film is desired Polymers capable of inducing a large retardation, specifically the retardation in the above-mentioned range, by the interference exposure of polarized light are preferable.
  • An anisotropic grating element is And I) a first transparent substrate layer; and II) a first photoreactive side chain which causes at least one reaction selected from the group consisting of (A-1) photocrosslinking, and (A-2) photoisomerization.
  • it includes an anisotropic diffraction grating having a first photoreactive polymer film.
  • anisotropic diffraction grating elements And III) a second transparent substrate layer; and IV) a second photoreactive side chain which causes at least one reaction selected from the group consisting of (A-1) photocrosslinking, and (A-2) photoisomerization.
  • a second photoreactive polymer film having The II) first photoreactive polymer film and the IV) second photoreactive polymer film are disposed to face each other, and the II) first film and the IV) second film In between, it is preferable to include an anisotropic diffraction grating in which the low molecular weight liquid crystal layer is disposed.
  • First and second transparent substrate layers are made of a transparent substrate.
  • a transparent substrate although it depends on the characteristics used as a polarization imaging device, for example, glass; plastics such as acrylic and polycarbonate; and the like can be used.
  • a transparent substrate it is preferable to have the property of transmitting polarized ultraviolet light.
  • (B) Low Molecular Weight Liquid Crystal Layer nematic liquid crystals, ferroelectric liquid crystals, etc. which are conventionally used in liquid crystal display elements and the like can be used.
  • cyanobiphenyls such as 4-cyano-4'-n-pentylbiphenyl and 4-cyano-4'-n-feptyloxybiphenyl as low-molecular liquid crystals
  • cholesteryl esters such as cholesteryl acetate and cholesteryl benzoate Carbonates such as 4-carboxyphenylethyl carbonate, 4-carboxyphenyl-n-butyl carbonate
  • phenyl esters such as phenyl benzoate and biphenyl phthalate
  • benzylidene-2-naphthylamine 4'- Schiff bases such as n-butoxybenzylidene-4-acetylaniline
  • benzidines such as N, N'-bisbenzylidene benzidine, p-dianisalbenzidine
  • 4,4'-azoxydianisole, 4,4'- Azox such as di-n-butoxy azoxybenzene Benzene; specifically shown phen
  • interference exposure of desired polarized light is performed on the above-mentioned photoreactive polymer film, and an arbitrary diffraction pattern is formed on the polymer thin film to obtain information on the Stokes parameters of light incident on the polymer thin film, It is preferable to use an anisotropic diffraction grating that is spatially separated according to the distribution of anisotropic orientation and birefringence formed in the polymer thin film, and converted to intensity information.
  • the photoreactive polymer film described above has a photoreactive side chain which causes at least one reaction selected from the group consisting of (A-1) photocrosslinking and (A-2) photoisomerization. It should be formed with a macromolecule.
  • photoreactive refers to the property of producing (A-1) photocrosslinking or (A-2) photoisomerization reaction; and both reactions.
  • the photoreactive polymer preferably has a side chain which causes (A-1) photocrosslinking reaction.
  • the photoreactive polymer is i) a polymer that exhibits liquid crystallinity in a predetermined temperature range, and is a polymer having a photoreactive side chain.
  • the photoreactive polymer should be ii) reactive with light in the wavelength range of 250 nm to 450 nm and exhibit liquid crystallinity in the temperature range of 50 to 300 ° C.
  • the photoreactive polymer preferably has a photoreactive side chain that responds to light in the wavelength range of 250 nm to 450 nm, particularly polarized ultraviolet light.
  • the photoreactive polymer preferably has a mesogenic group to exhibit liquid crystallinity in a temperature range of 50 to 300 ° C.
  • the photoreactive polymer has a photoreactive side chain having photoreactivity.
  • the structure of the side chain is not particularly limited, it has a structure that produces the reaction shown in the above (A-1) and / or (A-2), and has a structure that produces the (A-1) photocrosslinking reaction Is preferred.
  • the structure causing the photocrosslinking reaction is preferable in that the structure after the reaction can stably maintain the orientation of the photoreactive polymer for a long time even if it is exposed to external stress such as heat. .
  • the structure of the side chain of the photoreactive polymer is preferably one having a rigid mesogenic component because the alignment of the liquid crystal is stabilized.
  • mesogen component examples include, but are not limited to, biphenyl group, terphenyl group, phenylcyclohexyl group, phenylbenzoate group, azobenzene group and the like.
  • the main chain of the photoreactive polymer for example, radically polymerizable groups such as hydrocarbon, (meth) acrylate, itaconate, fumarate, maleate, ⁇ -methylene- ⁇ -butyrolactone, styrene, vinyl, maleimide, norbornene and the like Although there can be mentioned at least one selected from the group consisting of siloxanes, it is not limited thereto.
  • the side chain of the photoreactive polymer is preferably a side chain comprising at least one of the following formulas (1) to (6).
  • S is an alkylene group having 1 to 12 carbon atoms, and a hydrogen atom bonded to them may be replaced by a halogen group
  • T is a single bond or an alkylene group having 1 to 12 carbon atoms, and a hydrogen atom bonded to them may be replaced by a halogen group
  • Y 1 represents a ring selected from monovalent benzene ring, naphthalene ring, biphenyl ring, furan ring, pyrrole ring and alicyclic hydrocarbon having 5 to 8 carbon atoms, or the same or selected from their substituents
  • 2 to 6 different rings are bonded to each other via a bonding group B, and hydrogen atoms
  • the side chain is preferably any one type of photoreactive side chain selected from the group consisting of the following formulas (7) to (10).
  • A, B, D, Y 1 , X, Y 2 and R have the same definition as above; l represents an integer of 1 to 12; m represents an integer of 0 to 2; m1 and m2 represent an integer of 1 to 3; n represents an integer of 0 to 12 (provided that n is 0 and B is a single bond).
  • the side chain is preferably any one type of photoreactive side chain selected from the group consisting of the following formulas (11) to (13).
  • A, X, l, m, m1 and R have the same definition as above.
  • the side chain is preferably a photoreactive side chain represented by the following formula (14) or (15). Wherein A, Y 1 , l, m 1 and m 2 have the same definition as above.
  • the side chain is preferably a photoreactive side chain represented by the following formula (16) or (17).
  • A, X, l and m have the same definition as above.
  • the side chain may be a photoreactive side chain represented by the following formula (18) or (19). (Wherein, A, B, Y 1 and R 1 have the same definition as described above. One of q1 and q2 is 1 and the other is 0; l represents an integer of 1 to 12, m1 and m2 represent an integer of 1 to 3;
  • the side chain is preferably a photoreactive side chain represented by the following formula (20). Wherein A, Y 1 , X, l and m have the same definition as above.
  • a polymer having any one type of liquid crystalline side chain selected from the group consisting of the following formulas (21) to (31) may be included.
  • the photoreactive side chain of the above-mentioned polymer forming the photoreactive polymer film does not have liquid crystallinity, or the above-mentioned polymer main chain forming the photoreactive polymer film is liquid crystalline If not, the component forming the photoreactive polymer film may have any one type of liquid crystalline side chain selected from the group consisting of the following formulas (21) to (31).
  • Y 3 is a group selected from the group consisting of monovalent benzene ring, naphthalene ring, biphenyl ring, furan ring, nitrogen-containing heterocycle, alicyclic hydrocarbon having 5 to 8 carbon atoms, and a combination thereof
  • the hydrogen atoms bonded to them may be each independently substituted with -NO 2 , -CN, a halogen group, an alkyl group of 1 to 5 carbon atoms, or an alkyloxy group of 1 to 5 carbon atoms
  • the above-mentioned photoreactive polymer film is obtained by polymerizing a photoreactive side chain monomer having the above-mentioned photoreactive side chain, and in some cases, the photoreactive side chain monomer and the monomer having the above-mentioned liquid crystalline side chain Can be obtained by copolymerizing For example, it can be manufactured by referring to [0062] to [0090] of WO 2017/061536 (the contents of the publication are all incorporated herein by reference).
  • the polarization imaging device of the present invention has a lens element.
  • the lens element is not particularly limited as long as it has an effect of forming an image in a light receiving element described later.
  • the polarization imaging device of the present invention has a light receiving element.
  • the light receiving element is not particularly limited as long as the above-mentioned S 0 to S 3 can be obtained from the image data.
  • FIG. 3 is a view for explaining the outline of the polarization imaging apparatus of the present invention.
  • the polarization imaging apparatus of the present invention comprises an imaging lens, a color filter, an anisotropic diffraction grating, and a light receiving element array.
  • the imaging lens has a variable arrangement distance from the light receiving element array so that focus adjustment can be performed.
  • the diffraction angle of the anisotropic diffraction grating has wavelength dependency, so that for white light, angular dispersion may cause a problem of blurring of the image. Therefore, color filters are inserted to reduce the influence of dispersion.
  • the anisotropic diffraction grating is used in combination with an interference filter of a corresponding frequency band in which retardation is optimized according to the observation wavelength.
  • the imaging unit imaging lens, light receiving element array
  • the imaging unit imaging lens, light receiving element array
  • the light intensity of 0 deg linear polarization component, 90 deg linear polarization component, 45 deg linear polarization component, -45 deg linear polarization component, right-handed circularly polarized light component, left-handed circularly polarized light component shown in equation (1) can be calculated generally
  • a method of measuring is used, or a Fourier analysis method such as a rotational retarder method is used.
  • these methods are not suitable for the measurement of an object whose state changes with time, because in principle multiple measurements are required.
  • polarization imaging measurement in snapshot can be performed by spatially separating information necessary for measurement of Stokes parameters and acquiring the information at a time as intensity information. That is, it is characterized in that it can measure even a dynamic object to be measured. In addition, it is one of the features that it is inexpensive because it does not require an expensive optical element including a diffraction grating.
  • the polarization imaging value of the present invention can be measured two-dimensionally regardless of whether it is a dynamic measurement target or a static measurement target, so that it can be applied to various fields. Examples include, but are not limited to, the medical field, the field of autonomous driving technology of automobiles, the field of security, and the like.
  • the present invention will be specifically described using examples, but the present invention is not limited only by the examples.
  • P6CB photocrosslinkable polymer liquid crystal (4- (4-methoxycinnamoyloxy) biphenyl side groups (P6CB)) represented by the following formula was used.
  • P6CB was dissolved in dichloromethane, and spin-coated on a glass substrate to a film thickness of 300 nm. Two glass substrates coated with the P6CB film were prepared, and the P6CB film side was made to face each other to bond them, and an empty cell was created.
  • the produced empty cell was irradiated with an exposure energy of 600 mJ / cm 2 while causing OC interference of an ultraviolet laser having a wavelength of 325 nm emitted from a He-Cd laser. After irradiation, heat treatment was performed in an oven at 150 ° C. for 15 minutes, and after heat treatment, low molecular liquid crystal 5CB (4-cyano-4′-pentylbiphenyl) was injected into the cell to prepare a cell type OC lattice. The diameter of the produced anisotropic diffraction grating was 8 mm.
  • the polarization imaging apparatus includes, in order from the object, an imaging lens, an interference filter (FL532-3 manufactured by Throrlabs (central wavelength 532 nm), the anisotropic diffraction grating obtained above, A commercially available camera (ILCE6000S manufactured by SONY) is used as the light receiving element, and the imaging lens, interference filter, and anisotropic diffraction grating are packaged in a gauge system, and the commercially available camera is used. Designed to be worn.
  • Imaging measurement was performed using a beetle that exhibits selective reflection characteristics for circularly polarized light as a subject.
  • the image is shown in FIG. It can be seen from FIG. 5 that three image spots are obtained. From left to right, it corresponds to ⁇ 1st order light, 0th order light and + 1st order light component of the OC grating.
  • the ⁇ 1st order light component and the + 1st order light component represent a two-dimensional distribution of the left-handed circularly polarized light component and the right-handed circularly polarized light component.
  • the image of the -1st-order light component (I -1) and + 1st-order light component (I + 1) extracted by image processing Figure 6 shows the imaging image of S 3 obtained by performing the difference calculation based on the following formula .

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  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
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  • Eye Examination Apparatus (AREA)
  • Closed-Circuit Television Systems (AREA)
  • Cage And Drive Apparatuses For Elevators (AREA)
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  • Blocking Light For Cameras (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

La présente invention concerne un dispositif de capture d'image de polarisation avec lequel une mesure d'image de polarisation dans un instantané est possible, sans qu'une unité opératoire mécanique ne soit nécessaire, en particulier un dispositif de capture d'image de polarisation qui ne nécessite pas de positionnement de haute précision d'un élément polarisant, et plus particulièrement un dispositif de capture d'image de polarisation qui, en termes de coût, est relativement peu coûteux. La présente invention concerne un dispositif de capture d'image de polarisation comprenant un élément de réseau de diffraction anisotrope ayant une anisotropie optique modulée périodiquement, un élément de lentille et un élément de réception de lumière.
PCT/JP2018/030902 2017-08-23 2018-08-22 Dispositif de capture d'image de polarisation WO2019039486A1 (fr)

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WO2021261541A1 (fr) * 2020-06-25 2021-12-30 国立大学法人長岡技術科学大学 Dispositif d'imagerie de polarisation

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JP2007304215A (ja) * 2006-05-09 2007-11-22 Hayashi Telempu Co Ltd 光配向材および光学素子、液晶配向膜の製造方法
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JP7440845B2 (ja) 2019-06-18 2024-02-29 国立大学法人長岡技術科学大学 偏光撮像装置
WO2021261541A1 (fr) * 2020-06-25 2021-12-30 国立大学法人長岡技術科学大学 Dispositif d'imagerie de polarisation

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CN111247405B (zh) 2022-10-18
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