130 results about "Refractive index matching" patented technology

The invention relates to a coastal zone sediment erosion pore scale flow field observation system and observation method. The observation system comprises a wave-flow water tank, a sediment accumulation body arranged in the wave-flow water tank and PIV equipment used for observing the internal flow field and the pore size of sediment. A wave making plate and a wave dissipating plate opposite to the wave making plate are arranged in the wave flow water tank, experimental fluid used for simulating waves is arranged between the wave making plate and the wave dissipating plate, and a wave height meter floats on the experimental fluid; the sediment accumulation body is formed by accumulation of transparent solid particles with the same refractive index as the experimental fluid; the PIV equipment comprises a laser light source and a camera, the laser light source is focused on the sediment accumulation body, and the camera directly faces the sediment accumulation body and is used for collecting images. Compared with the prior art, a clearer sediment pore internal flow field image is obtained through the combination of the refractive index matching technology and the image particle velocity measurement method, so that effective observation of the pore scale flow field eroded by the sediment in the coastal zone is realized.

The invention discloses a method for wrapping high-refractive-index ceramic powder with a low-refractive-index product layer and a ceramic material, and relates to the technical field of ceramic additive manufacturing. The method comprises the following steps: forming a low-refractive-index product layer on the surface of ceramic powder through a physical vapor deposition method, a chemical vapor deposition method or a hydrothermal method; the material of the low-refractive-index product layer comprises at least one of silicon dioxide, aluminum oxide, yttrium oxide or yttrium aluminum garnet; the ceramic powder is high-refractive-index ceramic powder and comprises at least one of silicon carbide, silicon nitride or aluminum nitride. According to the method, on the premise that the powder body is prevented from being damaged and impurities are prevented from being introduced, a coating layer which is uniform, compact and good in refractive index matching is formed, and therefore the curing depth and printing reliability of the high-refractive-index ceramic powder in photocuring forming are effectively improved.

The present application relates to a kind of method and structure for inhibiting energy loss, solve the current liquid crystal wave sheet energy transmittance is not low problem.Structure includes: liquid crystal layer;With the first orientation film and the second orientation film respectively contacted with the two sides of liquid crystal layer, for orientation liquid crystal layer;First substrate and second substrate;Air-substrate interface refractive index matching film is respectively plated in the outer side of two substrates, for reducing the Fresnel reflection energy loss of air and first substrate, air and second substrate interface;Conductive film is respectively plated in the inner side of two substrates, for driving liquid crystal layer;First conductive film-liquid crystal refractive index matching film and second conductive film-liquid crystal refractive index matching film are respectively plated on two conductive films, for reducing the energy loss caused by interface between conductive film and liquid crystal layer.The structure can significantly improve the energy utilization efficiency of liquid crystal wave sheet, meet the needs of high efficiency, large angle, non-continuity light beam deflection based on liquid crystal wave sheet and liquid crystal polarization grating.

A liquid polymer is deposited onto the end face of an optical fiber and cured to form a matching layer having an outer surface that faces away from the end face. During the curing process, the optical fiber may be oriented so the end face faces downward to produce a matching layer having a curved outer surface, or oriented so the end face faces upward to produce a matching layer having a flat outer surface. The end face may include a peripheral area formed from an easy-to-clean coating that confines the liquid polymer to the core and cladding areas of the end face. The easy-to-clean coating also prevents spillover of the liquid polymer onto the cladding of the optical fiber. Matching layer thickness may be tuned using a spin coating process.

The application discloses a wide-angle optical antireflection method based on equivalent gradient refractive index matching and phase angle restriction, and the method can solve the problem that some medium materials corresponding to the refractive index do not exist, so as to meet the needs of subsequent gradient refractive index matching, by selecting two medium materials with different refractive indexes and respectively controlling the thickness of the medium layers, and converting the medium layers into equivalent medium layers with different equivalent refractive indexes and equivalent thicknesses according to a transmission matrix. In addition, the change of the propagation phase is restricted by limiting the propagation angle of the incident light in the medium layer, so as to realize the insensitivity of the propagation phase to the angle change, meet the needs of wide-angle transmission enhancement, and determine the medium material corresponding to the refractive index according to the range of the propagation angle restriction. According to the above method, the medium material capable of realizing the wide-angle optical antireflection can be quickly selected, and the time cost required for selecting the medium material is greatly shortened.

The invention relates to a method for rapidly transparentizing biological tissues, which comprises the following steps: carrying out degreasing treatment on a fixed biological tissue sample by using a degreasing solution which is an aqueous solution containing tetrahydrofuran and tetrahydroxypropyl ethylenediamine (EDTP); the degreased biological tissue sample is subjected to refractive index matching with a refractive index matching solution, transparency treatment is completed, and the refractive index matching solution is an aqueous solution containing urea, iohexol and EDTA. According to the method for transparentizing the biological tissue, visceral organs can be transparentized quickly, tissue shrinkage is not caused, and the tissue form is reserved. In addition, the method for transparentizing the biological tissue according to the invention has the advantages of fluorescence protection, morphology retention and high biological safety.

The invention discloses a magneto-optical effect-based dynamic zooming method and an optical system, and the method comprises the steps: arranging at least one magneto-optical crystal between a pre-amplifier and a main amplifier, so as to achieve the dynamic zooming through the magneto-optical effect; wherein the magneto-optical crystal is obtained by combining anisotropic materials with matched refractive indexes, and the anisotropic materials are processed into complementary parabola shapes. According to the invention, the magneto-optic effect is utilized to realize dynamic zooming, and the mode of complementary combination of the crystals with matched refractive indexes is utilized to solve the problem that the additional wavefront shape does not conform to the demand. Compared with an electro-optical effect scheme, an applied magnetic field is a uniform magnetic field along a transmission direction, so that a depolarization problem caused by a transverse component is avoided; compared with the scheme of aperture division, grating division and the like, the dynamic zooming can be realized on the premise of not influencing the output capability of the laser.

A polarizer applied for a viewing side of a display is disclosed. The polarizer comprises a polarizing layer with an absorption axis, and a protective film disposed on the viewing side surface of the polarizing layer. The protective film includes a birefringent substrate adjacent to the polarizing layer having a birefringence difference not greater than 0.10 and having a slow axis and a fast axis perpendicular to each other, wherein the slow axis is parallel to the absorption axis of the polarizing layer, and an interference elimination layer disposed on a display side surface of the birefringent substrate, wherein the interference elimination layer has a diffusing layer disposed on the birefringent substrate, and a refractive-index-matching layer disposed on the diffusing layer, wherein with the total haze of the protective film is between 30% and 75% and the reflectivity of the protective film satisfies the relationship (RSCI−RSCE)≤1.0% and RSCE / (RSCI−RSCE)≥1.6, wherein RSCI is an average reflectivity of diffuse component and specular component (specular component included, SCI) of the protective film, and RSCE is an average reflectivity of diffuse component (specular component excluded, SCE) of the protective film.

The invention relates to a high-gloss polycarbonate fiber-added composite material and a preparation method thereof. The material comprises the following components in parts by weight: 100 parts of polycarbonate resin, 15-35 parts of PMMA coated modified glass fiber and 1.5-3 parts of a refractive index matching agent, wherein the refractive index difference delta n between a coating layer and a matrix is less than or equal to 0.02. Glass fibers are subjected to surface treatment by adopting a melting mechanical coating method, molding is performed through a double-screw extruder side feeding process, the screw shear strength is in gradient change in the axial direction, and the shear rate ratio of a strong shear area to a low shear area is larger than or equal to 4: 1. The technical problems that glass fiber reinforced polycarbonate is low in surface glossiness and serious in floating fiber are solved, the 60-degree-angle glossiness of a product is larger than or equal to 92 GU, the tensile strength is larger than or equal to 110 MPa, and the surface floating fiber rate is lower than 2%. The preparation method is environment-friendly, free of solvent discharge, stable and reliable in process and suitable for high-end application fields such as consumer electronics shells.

The application relates to a cosmetic quality detection method, an electronic device and a storage medium. The method comprises the following steps: placing a foundation liquid sample bottle in a transparent detection pool, injecting a refractive index matching liquid between a flexible transparent film on an inner wall and the inner wall; emitting at least two illumination lights with different wavelengths to the foundation liquid sample bottle to obtain multiple original images under different spectral conditions; applying mechanical vibration to the foundation liquid sample bottle, and acquiring continuous image data of a flow recovery process of the foundation liquid in the bottle after the vibration stops; generating a hyperspectral uniformity atlas based on the multiple original images, and determining a texture recovery time constant based on the continuous image data; and determining whether the texture uniformity of the foundation liquid in the foundation liquid sample bottle meets a preset standard based on the hyperspectral uniformity atlas and the texture recovery time constant. The scheme provided by the application can detect the texture uniformity of the filled foundation liquid sample bottle, and reduces the product defect risk of travel-sized foundation liquid.

The invention discloses a mobile phone curved screen 3D tempered film capable of eliminating a white edge phenomenon and a preparation method of the mobile phone curved screen 3D tempered film, and belongs to the technical field of mobile phone tempered films.According to the mobile phone curved screen 3D tempered film, through gradient design of an adhesive layer, the adhesive layer forms a layered structure of a high-fluidity area, a transition area and a high-viscosity curing area from the center to the edge; the glue can uniformly extend from the center to the edge during fitting, so that the problem of glue shortage or glue overflow at the edge is avoided; in the optimization of the edge structure, the design of the groove and the diversion trench further guides the accurate filling of the glue layer, and the adhesion is enhanced by matching with the pre-coating tackifier, so that the attaching gap is reduced from the physical structure; meanwhile, the refractive index of the optical cement is matched with that of the glass substrate, the refraction difference of light on an interface is reduced, the white edge phenomenon is thoroughly eliminated under the synergistic effect of multiple technologies, and the comprehensive performance of the protective film is remarkably improved. The laminating precision reaches a high level of 99.5%, and more stable, attractive and universal screen protection choices are provided for users.

The application relates to a high-definition flexible optical film and a preparation method thereof. PET master batches, PEN master batches, flexible polyester elastomers and a nano composite dispersion liquid are subjected to melt extrusion, asynchronous bidirectional stretching, in-situ heat relaxation and cooling and winding to obtain the optical film, wherein the nano composite dispersion liquid comprises mCNC, SEBS, SA-BaSO4 and ethylene glycol. The application effectively reduces light scattering and greatly improves high-definition optical performance by using refractive index matched modified nano barium sulfate and highly dispersed modified nano cellulose crystals; the modified nano cellulose crystals improve the high compatibility and thermal stability of the PET base material, so that the PET base material can effectively transfer and disperse stress; SEBS and the composite flexible polyester elastomer synergistically toughen, internal stress is released and a flexible microstructure is constructed by combining the asynchronous stretching and heat relaxation process, so that the film is endowed with super-flexibility; the components have good compatibility, the film size is stable, and there is no rainbow stripe.

The application discloses an optical fiber device, a preparation method of the optical fiber device and a coupling device, and belongs to the technical field of micro-nano photonics. The application sequentially arranges a mode field expansion area and a phase modulation area at an exit end of an optical fiber, uses the mode field expansion area to expand a beam mode field diameter, uses a substrate film matched with the mode field expansion area in refractive index and a micro-nano unit with high refractive index to form the phase modulation area, realizes a target phase distribution based on geometric sizes and / or a rotation angle of the micro-nano unit, and then performs phase modulation and wavefront shaping on the expanded beam, so as to output a target light field such as a focused beam, a collimated beam, a Bessel beam or a Bessel beam array. The optical fiber device can realize high coupling efficiency, high alignment tolerance and multi-functional wavefront regulation at the exit end of the optical fiber, can solve the mode field mismatch problem in optical fiber-chip coupling, can reduce system complexity and realize multi-functional integration.

This invention discloses a low-side-view haze electrically controlled dimming film and its preparation method. A second conductive layer and a third conductive layer are respectively disposed on both sides of a second substrate layer to facilitate the subsequent stacking of a first PDLC layer and a second PDLC layer. By stacking the two PDLC layers (first and second PDLC layers), the thickness of a single PDLC layer can be reduced, effectively reducing side-view haze. Furthermore, due to the thinner PDLC, even with a lower liquid crystal ratio, the saturation voltage remains low, meeting the low-voltage requirements for automotive applications. Simultaneously, the haze of a single PDLC layer in the open state is low; the haze remains low after stacking the two PDLC layers, and anti-reflection is achieved through refractive index matching. By using low birefringence liquid crystal in the PDLC layer, the mismatch between the refractive index of the adhesive and the refractive index of the liquid crystal can be reduced during side-view observation, which is beneficial for reducing side-view haze in the transparent state of the dimming film. This preparation method can produce an electrically controlled dimming film with low side-view haze, low open-state haze, good transparency, and low driving voltage.

The application discloses a laser protection plate and a preparation method thereof. The provided laser protection plate comprises a reflection layer, a scattering layer, an absorption layer, a heat dissipation layer and a substrate layer which are sequentially stacked; wherein the reflection layer comprises a distributed Bragg reflection film formed by alternately depositing a high refractive index material and a low refractive index material; the material of the scattering layer comprises a first substrate and stearic acid-coated first scattering agents and stearic acid-coated second scattering agents dispersed in the first substrate; the material of the absorption layer comprises a second substrate and polyvinylpyrrolidone-modified composite nano-absorbing agents dispersed in the second substrate; the material of the heat dissipation layer comprises a third substrate and a heat dissipation agent modified by a dispersing agent dispersed in the third substrate; and the side surface of the substrate layer is provided with a microchannel structure. The laser protection plate provided by the application has a gradually changed refractive index matching between layers, and the interface reflection loss is reduced.

The invention discloses a method for regulating and controlling the high refractive index of photosensitive resin, which comprises the following steps: adding a refractive index regulator into a photosensitive resin system at 10-25 DEG C, and carrying out ultrasonic treatment to obtain a photosensitive resin composition; the refractive index regulator is alkyl orthosilicate and / or tetraalkyl titanate; curing the photosensitive resin composition through ultraviolet irradiation, and adjusting curing parameters to calibrate the refractive index of the photosensitive resin composition. According to the photosensitive resin composition and the method for regulating and controlling the high refractive index of the photosensitive resin, provided by the invention, the raw material components are simple, the preparation is convenient and fast, the regulation and control of the high refractive index of 2.0 or above can be realized through the regulation and control effect of the refractive index regulator, and the refractive index matching requirements of different optical scenes are met.

An imaging system for a portable electronic device includes a variable aperture between a lens group and an image sensor. The variable aperture is defined by an electrochromic stack that defines a switching region and a central non-switching region. The non-switching region can be etched through the same material or set of materials defining the switching region and is backfilled with a dielectric transparent material having an index of refraction substantially equal to an average index of refraction of the layer(s) of the switching region of the electrochromic stack. This construction substantially reduces visible light absorption of the variable aperture.

The application discloses a kind of optical fiber LMR sensing probe systems based on double film layer structure, by supercontinuum spectrum light source, Y type optical fiber bundle, double film layer optical fiber LMR sensing probe, optical fiber spectrometer and host computer software composition;The double film layer optical fiber LMR sensing probe is sequentially removed by inside to outside cladding large core diameter multimode optical fiber, low refractive index matching layer, loss mode excitation layer, solve the LMR spectrum signal cross talk problem by TE / TM polarized light excitation, on spectrum, as TE / TM polarized light excitation LMR resonance wavelength does not affect each other, thus produce double resonance effect.The double film layer optical fiber LMR sensing probe system proposed in the application not only realizes the substantial improvement of detection precision, and double resonance sensing result can be verified each other, further guarantee the reliability of experimental result.

This application discloses a laser hidden dicing method and a wafer. The laser hidden dicing method includes: bonding individual crystal pillars to be processed in an array to a first surface of a transparent substrate using a refractive index matching adhesive; flipping the transparent substrate with the bonded crystal pillars so that a second surface of the transparent substrate faces upwards, using the second surface as a reference plane for laser incidence; the second surface being the surface opposite to the first surface; controlling a laser beam corresponding to each crystal pillar to be incident from the reference plane, sequentially passing through the transparent substrate and the refractive index matching adhesive, and focusing on the interior of the corresponding crystal pillar for laser modification; wherein, the refractive index matching adhesive is also used to reduce the refractive index difference at the crystal pillar bonding interface. Through the above method, the laser hidden dicing method provided by this application can perform parallel and efficient processing of polycrystalline pillar samples with highly inconsistent results, reduces the requirements for the surface roughness of each crystal pillar, saves pre-processing time for the crystal pillars, and greatly improves processing efficiency and quality.

The present application belongs to the technical field of intelligent coating, and relates to a composite coating material with fluorescent self-indication function for micro stress detection and a preparation method and application thereof. The present application realizes high sensitivity detection of micro cracks by adding fluorescently labeled microcapsules capable of breaking at the crack and releasing fluorescent dyes at the fixed point, and effectively avoids the adverse effects of microcapsule introduction on the transparency and flexibility of the coating through refractive index matching, particle size optimization and film thickness design, thereby being suitable for early warning of corrosion risk of various substrates, providing sufficient window period for equipment maintenance and coating repair, and significantly improving the safety and reliability of the protective coating.

The invention relates to the technical field of photovoltaics, in particular to an all-black back contact battery and a preparation method and application thereof. The all-black back contact battery sequentially comprises a black frame, a black back plate, a back contact battery piece layer, a black passivation anti-reflection layer, a black packaging adhesive film layer, an anti-reflection coating and a transparent cover plate which are arranged in a stacked mode from bottom to top. Wherein the black passivation anti-reflection layer sequentially comprises an Al2O3 layer, a SiNx layer and a black nano-composite layer from bottom to top, and the Al2O3 layer, the SiNx layer and the black nano-composite layer are arranged in a stacked mode. And a texture structure is arranged on the surface of one side, far away from the antireflection coating, of the transparent cover plate. According to the all-black back contact power supply, through full-link refractive index matching and micro-nano structure design, ultra-uniform all-black appearance, extremely low light reflection, long-time weather resistance stability and personalized appearance adaptation are synchronously realized, high-efficiency power generation and high reliability are not affected, and high-end BIPV scene requirements are comprehensively met.

An integrated electro-optical non-reciprocal mode converter based on birefringent crystal refractive index matching comprises a chip, the upper layer of the chip is an electro-optical material film with birefringent characteristics, a mode converter is prepared on the electro-optical material film, and the mode converter is a two-port device; the first port is used for receiving an input optical signal of a mode 1 and allowing the optical signal to enter the mode converter; and the second port is used for outputting the converted optical signal in the mode 2. The refractive index difference of a birefringent material to a transverse electric mode (TE) and a transverse magnetic mode (TM) is utilized to realize the pre-coarse matching of the refractive indexes of TE and TM modes, and then the fine matching of the refractive indexes and wave vectors is realized in combination with electro-optical modulation, so that the integrated electro-optical mode converter insensitive to the process is realized. The device is simple in structure and has a wide application prospect.

This utility model relates to a wavelength division multiplexing (WDM) optical device, comprising: a substrate having opposing first and second grooves; a plurality of filters disposed within the first groove; a transparent filling medium filling the first groove, enclosing the filters, wherein the refractive index of the transparent filling medium matches that of the filters; and a plurality of lenses located at the bottom of the second groove, wherein the positions of the plurality of lenses correspond one-to-one with the positions of the plurality of filters. In this WDM optical device, the transparent filling medium enclosing the filters and matching the refractive index of the transparent filling medium to the filters, using a transparent filling medium with a refractive index matching that of the filters as the environmental medium, can avoid optical path misalignment, eliminate the need for additional structural adjustments to the filter positions, and simplify the structure of the WDM optical device.

The invention discloses a preparation method and application of optical-grade high-transparency flame-retardant PVC / SMMA (polyvinyl chloride / SMMA) alloy particles, the alloy is prepared by taking optical-grade PVC and SMMA as matrixes, matching with auxiliaries such as a chain extender, a compound flame retardant, a silane coupling agent and an impact modifier, and carrying out pre-dispersion, pre-coupling, blending, extrusion granulation and the like. Wherein the PVC and the SMMA reduce light scattering through refractive index matching; after the compound flame retardant (WSFR-TCPP, F50508 and KR-2710) is modified by KH-570, nanoscale dispersion is realized, and the flame retardant effects of a gas phase and a condensed phase are synergistically exerted. Under the condition that the thickness is 3.2 mm, the light transmittance of the obtained alloy reaches 91.8%, the haze is 0.8%, the flame retardant rating is UL945VA, the oxygen index is 34.2%, and meanwhile the excellent mechanical properties that the tensile strength is 52 MPa and the impact strength is 20 kJ / m are kept. In the production process, a low-shear extrusion and nitrogen protection process is adopted, the crystal point is 0 / 10kg, and the YI chromaticity is 1.5. The material is widely applied to the fields of electronic display screens, transparent fireproof building materials, automotive interiors and the like, and fills the market blank of optical-grade high-flame-retardant materials.

The application provides a stress measuring device for glass and an optical element, wherein: a light emitting unit is used for emitting laser light; the optical element comprises a first surface and a second surface, a laser light emitting direction of the light emitting unit is towards the first surface, the second surface is in contact with the glass to be measured, a collecting unit is used for collecting scattered light and processing the scattered light into a data signal; a processing unit is used for determining a stress distribution in the glass to be measured according to the data signal; wherein a plurality of support pieces and a gasket are arranged on the second surface, and the plurality of support pieces are arranged around the gasket. Thus, a matching refractive index liquid can be arranged between the prism and the glass to be measured, a small amount of the refractive index liquid is used to complete the measurement, the refractive index deviation between the laser passing through three media is reduced, the light loss caused by the interface is reduced, and the relative sliding of the glass to be measured caused by the refractive index matching liquid during the measurement is avoided, thereby solving the problem of inaccurate measurement.

The invention discloses a tensile induced dual-mode response optical elastomer and a preparation method and application thereof, and belongs to the technical field of optical anti-counterfeiting materials. The invention designs and prepares an optical elastomer compounded by CaF2: Ce < 3 + >, Tb < 3 + > hollow nanospheres and polydimethylsiloxane. Based on interface refractive index matching regulation and control of CaF2: Ce < 3 + >, Tb < 3 + > hollow nanospheres and a PDMS matrix, the optical elastomer shows synchronous transparency and photoluminescence intensity response performance in a mechanical deformation process. Through systematic experimental analysis, an optical signal regulation and control mechanism induced by mechanical deformation is clarified, and the regulation and control rule of structural parameters of the CaF2: Ce < 3 + >, Tb < 3 + > hollow nanospheres on optical signals is disclosed. Finally, by designing an optical anti-counterfeiting model, the application potential of the optical anti-counterfeiting model in the anti-counterfeiting field is proved.

Embodiments of the present disclosure generally relate to methods for forming a waveguide. Methods may include measuring a waveguide substrate, the waveguide having a substrate thickness distribution; and depositing an index-matched layer onto a surface of the waveguide, the index-matched layer having a first surface disposed on the waveguide substrate and a second surface opposing the first surface, wherein the index-matched layer is disposed only over a portion of the waveguide substrate, and a device slope of a second surface of the index-matched layer is substantially the same as the waveguide slope of the first surface of the waveguide.

The invention belongs to an optical thin film technology, and discloses a high-transmittance ultraviolet short-wave pass optical filter and a preparation method thereof. The optical filter comprises a substrate, a filtering film located on one side of the substrate and an antireflection film located on the other side of the substrate. The filter film is a light-operated structured film layer, the light-operated structured film layer comprises a first refractive index layer and a second refractive index layer which are alternately arranged, the refractive index of the first refractive index layer is greater than that of the second refractive index layer, and the total thickness of the light-operated structured film layer is 1-2m; the thickness of the antireflection film is 30%-85% of the thickness of the filter film. According to the method, the transmittance of the ultraviolet short-wave pass optical filter is improved by optimizing film refractive index matching and film system structure design and adjusting deposition process parameters.

The application discloses an optimization method for calibrating wall-attached oil film by refractive index matching method, and belongs to the technical field of diesel engines. In the application, the order of magnitude of the wall-attached oil film thickness is micron, the calibration solution consistent with the refractive index of the test fuel is obtained by matching dodecane and tetrahydro naphthalene calibration solution, and the calibration precision is improved. In view of the non-uniformity of the oil film thickness during the calibration of the wall-attached oil film, the application judges the relationship between the gray value uniformity of the image and the preset uniformity threshold value, and removes the test working condition points with non-uniform thickness, so that the success rate of the calibration test is increased, and the calibration precision is improved. In view of the problem that the heavy components in the calibration solution evaporate in advance, the application compares the error between the test volume of the heavy components in the calibration solution and the known volume, removes the test working condition points affecting the precision, and improves the calibration precision. The application measures the oil film thickness of the oil spray impinging on the wall surface of the piston in the engine by the expression of the change relationship between the wall-attached oil film thickness and the scattered light intensity.