74 results about "Composite microstructure" patented technology

The invention discloses a Si-based composite microstructure photoelectric detector and a forming method thereof, and relates to the technical field of photoelectric detection. The Si-based composite microstructure photoelectric detector comprises a signal acquisition first terminal, a light enhancement absorption microstructure and a light transmissible signal acquisition second terminal. The enhanced light absorption microstructure is composed of a short-wave-band visible light enhanced absorption circular light sensitive area, a middle-wave-band visible light enhanced absorption inner ring light sensitive area and a long-wave-band visible light enhanced absorption outer ring light sensitive area. According to the invention, the composite light sensitive unit with an eagle-eye bionic structure is designed, and low reflection and high absorption of light of different wavebands are realized by regulating and controlling the geometric shapes and arrangement modes of the rod-shaped, prismatic table-shaped and conical subunits in the microstructure, so that the light response characteristic of the photoelectric detector is improved.

The invention discloses a front light guide plate process, which comprises the following steps of: adopting a modified PMMA (polymethyl methacrylate) plate as a base material, cleaning the surface of the modified PMMA plate, presetting a functional layer, performing an imprinting process on the surface of the light guide plate base material, and forming a bottom groove-bulge microstructure and a top prism array at one time through a composite die. Depositing an anti-reflection coating on the surface of the light guide plate semi-finished product with the composite microstructure, stacking TiO2 / SiO2 multilayer films layer by layer, and regulating and controlling the thickness of the coating to a target optical parameter in real time; an embedded heat dissipation layer is integrated on the back face of the coated light guide plate, a graphene heat conduction grid is generated through the laser induction technology, and optical performance and structural quality detection is conducted on the finished light guide plate; the light guide efficiency is remarkably improved through the composite microstructure design, the brightness and uniformity of the light guide plate are improved, the surface reflectivity and light loss are reduced through the multiple anti-reflection coatings, the problem of heat aggregation under high brightness is effectively solved through the laser-induced graphene heat dissipation layer, the product performance is improved, and the light guide plate with high brightness and high uniformity is output.

The present invention relates to the technical field of metallurgy. Disclosed are a manufacturing method for and use of a corrosion-resistant and low-temperature-resistant continuous-cast steel billet for a wind turbine. The manufacturing method comprises the following steps: carrying out electric furnace steelmaking, carrying out LF refining, carrying out VD vacuum treatment, carrying out continuous casting by means of three-stage vibration crystallization, i.e., non-sinusoidal, sinusoidal and non-sinusoidal vibration crystallization, and carrying out gradual slow-cooling aging, i.e., strong, medium and weak slow-cooling aging, to obtain a continuous-cast steel billet for a wind turbine. According to the present invention, by means of composition and process control, a specific microstructure can be formed. On one hand, a continuous-cast billet is manufactured by means of three-stage vibration crystallization, i.e., non-sinusoidal, sinusoidal and non-sinusoidal vibration crystallization, in a crystallization process; and on the other hand, in the present invention, by means of gradual slow-cooling, i.e., strong, medium and weak slow-cooling, a characteristic composite microstructure having a 0.1-5.5 μm (Nb, V, Ti)CN phase and a 0.3-3.8 nm dispersed copper-rich nanophase is finally formed, and the composite microstructure has excellent low-temperature impact resistance and multiple biological corrosion resistance.

The present invention discloses a composite microstructure surface that utilizes microtubes and micropores to synergistically enhance boiling heat transfer, comprising a microcolumn matrix and a plurality of microcolumn units distributed in an array on the microcolumn matrix. The microcolumn unit is composed of a plurality of microcolumns distributed in an array, and each microcolumn has microtubes symmetrically arranged on each side wall and micropores symmetrically arranged on the top. By adding micropores on the top surface of the microcolumn, the number of vaporization cores on the microstructure surface is effectively increased, the superheat of the surface is reduced, and thus the boiling heat transfer coefficient of the surface is improved; secondly, microtubes are provided on each side wall of the microcolumn, and by utilizing the interaction between microcolumns, micropores and microtubes in regulating the gas-liquid behavior during the boiling process, a multi-directional rehydration system is established from the rehydration channel to the microcolumn unit groove and the microtube rehydration, thereby enhancing the rehydration capacity of the surface, increasing the critical heat flux density of the surface, delaying the occurrence of boiling crisis, and achieving synergistic enhancement of the boiling heat transfer performance of the microstructure surface.

The invention belongs to the technical field of optical fiber sensing, and discloses a seawater temperature, salinity and depth integrated optical fiber sensor based on a composite microstructure and a preparation method. The single-mode optical fiber, the first coreless optical fiber and the graded-index optical fiber are sequentially welded to form a collimation structure for long-distance transmission of light beams; one end of the graded-index optical fiber is sequentially connected with the hollow-core optical fiber and the second coreless optical fiber; the hollow-core optical fiber core is filled with polydimethylsiloxane, and the filling position of the polydimethylsiloxane is located at the end where the graded-index optical fiber and the hollow-core optical fiber core intersect; the microsphere structure is sequentially divided into a cladding cavity and an air cavity from outside to inside; the end face of one end of the second coreless optical fiber intersects to the air cavity and the cladding cavity of the microsphere structure. Test results show that the seawater temperature, salinity and depth integrated optical fiber sensor based on the composite microstructure has the potential of integrated measurement of seawater temperature, salinity and depth parameters.

The invention discloses a micro-lens optical structure and an optical film, and relates to the technical field of display. The micro-lens optical structure comprises a semi-circular convex hull, a first lens, a second lens and a third lens, the wrinkle structures are arranged on the spherical surface of the semicircular convex hull and are uniformly distributed in the circumferential direction of the bottom of the semicircular convex hull; wherein the plurality of wrinkle structures are arranged by deviating from the symmetry axis of the semicircular convex hull, and are arranged by slotting from the upper surface of the semicircular convex hull to the bottom of the outer edge of the semicircular convex hull according to a preset angle, so that a composite microstructure in which a plurality of arc-shaped grooves are uniformly distributed is formed. According to the invention, the problems of high cost, complex processing technology and light interference defect of the existing diffusion film in the aspect of improving the uniformity of the LED light source and the problem of limited improvement of the picture uniformity and shielding effect of the traditional structure are solved.

The invention discloses a preparation method and device of a hair follicle-like composite microstructure. According to the method, by means of the thermal deformation performance of the memory alloy material, the electrode deformation section made of the memory alloy material goes deep into the pit formed in the surface of the cutter through laser machining, the deformation section is heated to be in a circular arc shape, and an electrochemical etching method is adopted; an electrochemical system formed by an electrode, a cutter, a power supply device and electrolyte in the pit is used for enabling the rotating electrode to etch the pit into hair follicle structures, then flocking glue doped with magnetic particles is injected into the hair follicle structures, fiber bundles are implanted into the hair follicle structures, and then the hair follicle structures are formed. And after flocking is completed, the magnetic particles in the hair follicle structures are magnetized, and then the work of preparing the hair follicle-imitating composite microstructure on the surface of the tool is completed. According to the prepared cutter surface hair follicle-imitating composite microstructure, the cutter can achieve the continuous wetting effect in the working process, the good wetting performance is achieved, and then the cutting performance of the cutter is improved.

The application relates to an intelligent skin multi-modal measurement system and method based on a FBG cone cavity and a bending composite microstructure. The system comprises a sensing module, an optical sensing module, a data acquisition and processing module, a force output module and a temperature control module; the sensing module comprises a flexible skin structure and a cone FBG and bending single-mode fiber composite structure embedded in the inside of the flexible skin structure; the cone FBG and bending single-mode fiber composite structure comprises a cone FBG section and a bending single-mode fiber section integrated in the same optical fiber; the optical sensing module and the data acquisition and processing module are optically connected with the cone FBG and bending single-mode fiber composite structure respectively; the force output module is used for applying a normal force to the flexible skin structure; and the temperature control module is used for providing a constant temperature field for the flexible skin structure. The application can realize accurate measurement of temperature and normal force and complete multi-modal sensing of the intelligent skin.

A method for creating a composite microstructure surface assisted by microcracks belongs to the technical field of precision machining of complex microstructure surfaces of brittle materials. The composite microstructure surface creation method mainly uses active modulation of tool posture and vibration trajectory, cooperates with tool path planning, and performs processing within a cutting depth range greater than the critical cutting depth of brittle-ductile transition and less than the cutting depth of microdefects extending to the lowest point of the groove. Microcracks are used to induce machining microdefects and expand them to the surface on one side in the tool machining direction. Material removal is achieved by regulating the mutual expansion and intersection of microcracks in specific areas, or by regulating the generation of microdefects induced by microcracks at specific locations to achieve composite microstructure surface creation. This method can achieve the one-time creation of a spatial low-frequency characteristic structure with plastic removal characteristics on brittle materials and the creation of a spatial high-frequency brittle crack removal characteristic composite microstructure surface in a plastic low-frequency space, with high efficiency and low cost.

This invention belongs to the field of fiber optic sensing technology, and discloses an integrated fiber optic sensor for seawater temperature, salinity, and depth based on a composite microstructure and its fabrication method. A single-mode fiber, a first coreless fiber, and a graded-index fiber are sequentially fused together to form a collimation structure for long-distance beam transmission. One end of the graded-index fiber is sequentially connected to a hollow-core fiber and a second coreless fiber. The core of the hollow-core fiber is filled with polydimethylsiloxane, located at the intersection of the cores of the graded-index fiber and the hollow-core fiber. The microsphere structure is divided into a cladding cavity and an air cavity from the outside to the inside. One end face of the second coreless fiber intersects with the air cavity and cladding cavity of the microsphere structure. Test results show that the integrated fiber optic sensor for seawater temperature, salinity, and depth based on the composite microstructure has the potential for integrated measurement of seawater temperature, salinity, and depth parameters.

This invention discloses a method for improving the performance of Q690C steel used in tunnel pre-embedded components. Through microalloying and strict desulfurization and deoxidation during the steelmaking stage, controlling the final rolling temperature of hot rolling / forging (820-880℃), combined with differential zone controlled cooling (7-10℃ / s in thin zones, 3.0-4.2℃ / s in thick zones) and uniform isothermal short-stop (330-350℃×10-15 min), deep cooling after quenching (-80 to -100℃×20-40 min), and two-stage tempering (420-480℃ and 200-260℃), a refined prior-austenite grain, uniform lower bainite / tempered martensite, and nano-precipitate composite microstructure is formed. Its -40℃ impact energy reaches 128-155J, CGHAZ grain size is 6-10μm, retained austenite ≤2.5%, and the toughness, corrosion resistance, and fatigue life of welded joints are significantly improved.

The invention relates to the technical field of semiconductors, and discloses a chromium coating for a photomask substrate, a preparation method of the chromium coating, a photomask and a semiconductor element, the chromium coating is a pure chromium coating and has a single microstructure or a composite microstructure; wherein the single microstructure comprises any one of an amorphous state, a polycrystalline state and an amorphous-nanocrystalline mixed state; the composite microstructure comprises at least two of an amorphous state, a polycrystalline state and a mixed state; and the mixed state is a transition state microstructure of amorphous polycrystalline transformation. By regulating and controlling the microstructure of the pure chromium target, the chromium coating for the photomask substrate can meet the design target of optical density of unit thickness at the wavelength of 193nm under the condition of ultra-thin thickness, so that the three-dimensional mask effect caused by a thick chromium layer is avoided, and the contradiction of insufficient shading of the thin chromium layer is solved. Meanwhile, the mode based on the pure chromium material assisted by magnetron sputtering current regulation and control does not need a complex reaction gas system, the process window is wide, the reproducibility is good, and the method is suitable for industrial batch production.

This invention provides a method and system for discretizing and reconstructing the microstructure mesh of continuous fiber composite materials, relating to the field of image processing technology. The method includes: acquiring slice images from multi-directional industrial CT scans; labeling the slice images; training an image segmentation model using a 2.5DU-Net architecture; inputting the target slice image into the trained model and outputting the image segmentation result; performing image post-processing on the image segmentation result; extracting the geometric parameters of the fiber bundles using Fourier transform and ellipse extraction algorithms, and grouping the fiber bundles into multiple unit cells; establishing a geometric model of the fiber bundle and matrix assembly using the lofting and Boolean operation functions of a geometric modeling library; meshing the geometric model of the fiber bundle and matrix assembly using the Gmsh mesh generator, generating a 3D finite element mesh file, and exporting it as an .inp format file; and obtaining the complete input file by setting a Set collection.

The invention relates to the technical field of composite materials, in particular to a modification treatment method for camellia oleifera shells through water immersion fermentation. The method comprises the following steps: performing anaerobic fermentation on camellia oleifera shells to obtain a fermentation product; carrying out steam pressurization treatment on the fermentation product, and then carrying out instantaneous pressure relief explosion operation; performing steam heat treatment on the fermentation product; cleaning the fermentation product to obtain modified camellia oleifera shells; and crushing to obtain camellia oleifera shell particles. According to the invention, pectin and oligosaccharide are decomposed by virtue of microbial flora, so that a lignin composite microstructure is relaxed, the interfacial compatibility between fibers and a plastic matrix is improved, lignin is stripped by virtue of shearing force of steam explosion, gaps are formed, and the connection strength between the fibers and the bonding performance between the fibers and the plastic matrix are improved; finally, hemicellulose is promoted to be degraded in advance through steam heat modification, water-absorbing groups in the camellia oleifera shells are reduced, the water absorption stability of the composite material is improved, and the bad problems that fibers are separated from a plastic matrix interface due to pyrolysis and the like are solved.

A dense ceramic body includes a composite microstructure having a first solid phase and a second solid phase. The first solid phase includes cerium oxide with cerium in a Ce(IV) oxidation state, and the second solid phase includes a non-cerium-based oxide. An oxygen ion transport phase is also included, forming a continuous network throughout the body. The composite microstructure is embedded within this continuous network of the oxygen ion transport phase. The first and second solid phases are arranged in a nano-sized, phase-separated morphology.

The application discloses a low-modulus titanium alloy with surface wear-reducing / antibacterial composite function microstructure and a preparation method thereof. The titanium alloy comprises a low-modulus Ti-Mo alloy base and Ti5Si3, Ti3SiC2 and Ti3(Cu, Si)C2 micro-porous structures loaded on the surface. The preparation method comprises the following steps: placing MoSi2 powder after corrosion in a CuCl2 solution to form copper ion loaded MoSi2 powder; mixing the powder with medical titanium alloy powder by ball milling, and forming a low-modulus Ti-Mo alloy under the action of high-temperature sintering; and making carbon decomposed from methane gas react with Ti, Si and Cu in the low-modulus Ti-Mo alloy base in situ by a femtosecond laser beam to form Ti5Si3, Ti3SiC2 and Ti3(Cu, Si)C2 micro-porous structures. The process can not only reduce the elastic modulus of the titanium alloy and eliminate the "stress shielding" effect, but also significantly improve the wear resistance and antibacterial property of the titanium alloy.

The invention discloses an Mg-Hg-Ga anode material for a high-power magnesium-air battery as well as a preparation method and application of the Mg-Hg-Ga anode material, and belongs to the technical field of electrochemical energy storage power supply electrode materials, the anode material comprises the following components in percentage by weight: 0.06-0.10 wt.% of Hg, 1.55-1.75 wt.% of Ga, and the balance of Mg and inevitable impurities; the microstructure is a single solid solution structure in which alloy elements are uniformly distributed and no second phase is separated out, a heterogeneous composite microstructure is formed by compounding a grain refining area and a grain growing area, the overall grain size is in continuous single-peak distribution, the peak shape is sharp, the distribution is slightly wide, and a separated double-peak or multi-peak phenomenon does not occur. According to the material, through uniform solid solution and microstructure regulation and control of Hg and Ga, a point-surface synergistic corrosion mechanism is achieved, self-stripping of corrosion products can be promoted in the discharge process so as to keep high activity, and hydrogen evolution side reaction and blocking effect can be effectively inhibited. When the material is applied to the magnesium-air battery, high discharge voltage, high specific energy and high anode utilization rate can be obtained at the same time, and the comprehensive performance of the battery is remarkably improved.

The invention discloses a common nepenthes slippage area imitating super-hydrophobic microstructure design and a preparation method. According to the design of the super-hydrophobic microstructure, a unique moon bone body and a wax crystal structure of a common nepenthes slippage area are used for reference, the moon bone body is approximate to a concave cylinder, the wax crystal is approximate to an irregular blind hole structure, and the super-hydrophobic surface is prepared by utilizing the femtosecond laser ablation characteristic. The method comprises the following steps: establishing a three-dimensional model based on a theoretical model of a composite microstructure of a lunar bone body and a waxy crystal in a common nepenthes slippage area and a droplet infiltration super-hydrophobic microstructure, obtaining an original numerical equation between the composite microstructure and a super-hydrophobic function, namely wettability, and determining characteristic parameters of the corresponding composite microstructure when a contact angle is greater than 150 degrees; and finishing the design of the super-hydrophobic microstructure. A titanium alloy material is selected and polished to 0.8 mu m, the composite microstructure composed of concave cylinders and irregular blind holes is etched in the polished titanium alloy surface by means of the characteristics of femtosecond laser, and chemical fluorination treatment is carried out to prepare the super-hydrophobic surface with the common nepenthes slip area imitating composite microstructure. A new thought is provided for design and preparation of the bionic functional super-hydrophobic surface microstructure, and the method has important scientific significance and application value.

1. Name of the designed product: lens (composite microstructure). 2. Use of the designed product: lens. 3. Design points of the designed product: in shape. 4. Picture or photo best indicating the design points: a enlarged view.

This invention discloses an induction heating process for improving the low-temperature toughness of bulb flat steel, comprising: using a composite induction heating method of medium frequency and high frequency, with the heating rate controlled at 15-25℃ / s; heating the bulb head to 900-905℃ and the web to 870-880℃, and holding at this temperature for 2-3 minutes; using a water-polymer solution or a combination of water cooling and air cooling during quenching, with the cooling rate controlled at 15-25℃ / s; and controlling the tempering temperature at 640-670℃, holding at this temperature for 2-3 hours to allow for the complete decomposition of martensite and bainite, resulting in a composite microstructure of ferrite + tempered martensite + fine bainite. The bulb flat steel treated by this process exhibits the following mechanical properties: tensile strength ≥ 620 MPa, yield strength ≥ 520 MPa, elongation ≥ 30%, impact absorption energy at -60℃ ≥ 320 J, and ductile-brittle transition temperature ≤ -80℃.

The present invention is applicable to the technical field of high entropy alloys, and provides a multi-scale organization composite strengthening type high entropy alloy, which is composed of elements Co, Cr, Fe, Ni, Nb, and Mo, and the general formula in terms of atomic ratio is CoCrFeNiNbxMo0.4-x, wherein x=0.1-0.3; under the cast condition, the CoCrFeNiNbxMo0.4-x high entropy alloy is organized into an FCC matrix and a micron-sized Laves phase structure; after annealing, the CoCrFeNiNbxMo0.4-x high entropy alloy includes an FCC matrix, a micron-sized Laves phase, and an atomic-level SRO structure. The present invention also provides a method for preparing a multi-scale organization composite strengthening type high entropy alloy, comprising the following steps: according to the target atomic ratio, metal particles Co, Cr, Fe, Ni, Nb, and Mo are smelted to obtain a cast alloy; the cast alloy is annealed and quenched with water to obtain the multi-scale organization composite strengthening type high entropy alloy, and the annealing temperature is 600-800°C. The present invention constructs a composite microstructure of multi-scale precipitation phases and short-range order, and improves the yield strength and ultimate strength of the alloy while ensuring a certain plasticity.

The invention discloses a double-effect composite microstructure lens for preventing and delaying myopia, which comprises a lens main body and a functional area, the functional area comprises a central optical correction area arranged in the center, and the lens main body is provided with an annular light diffusion area for reducing the contrast intensity of peripheral retina signals on the outer side of the central optical correction area. And a double-effect composite microstructure functional area used for reducing negative defocus signals from reaching the retina so as to delay myopia occurrence and development is arranged on the outer side of the annular light diffusion area of the lens main body. Compared with the prior art, the invention has the advantages that: a point or a micro lens is changed into a nesting hexagonal composite structure, the micro lens is arranged inside the nesting hexagonal composite structure, and the light diffusion is arranged outside the nesting hexagonal composite structure, so that light rays entering the eyes can irregularly and dynamically change in three states of defocusing, aggregation and diffusion along with the rotation of the eyes during use, the generation of negative defocusing signals can be reduced, and the imaging quality of the eyes can be improved. And the nerve adaptability of a brain visual system to regular light can be reduced, and the delay effect is not easily weakened after long-term use.

The application provides a super martensite-bainite complex phase organization and toughening hot forming method, which first changes the structure of an ultra-high strength steel plate into a nanoscale super fine martensite-bainite complex phase organization with dispersed nanometer carbide and interlayer residual austenite film through a process flow of flash heating-high temperature stamping forming-middle temperature short time dynamic distribution-low temperature grading quenching, wherein the dispersed nanometer carbide and the super fine martensite-bainite complex phase organization can realize complex phase organization strengthening, the super fine and dense structure with a small amount of low temperature bainite and the intergranular nanometer thickness residual austenite film can realize complex phase organization toughening, so that the strength and toughness are both increased under the premise of material "simplification", the crash performance and service reliability of the hot forming component are significantly improved, and reliable technical support is provided for automobile light weight and safety.

This application relates to the field of semiconductor optoelectronic device technology and discloses a tilted waveguide semiconductor laser with a composite microstructure. The semiconductor laser includes a tilted waveguide, and the base-side mode forms a zigzag resonant path within the tilted waveguide cavity. This ensures high end-face coupling efficiency of the base-side mode within the tilted waveguide semiconductor laser at different etching depths. An internal microstructure is disposed in the region within the tilted waveguide cavity that does not overlap with the zigzag resonant path; external microstructures are disposed in the regions on both sides of the tilted waveguide that overlap with the zigzag resonant path. Both the internal and external microstructures are used to increase the loss of higher-order side modes, improving the lateral beam quality, and have broad application prospects in fields such as pump sources and space communication.

The present invention discloses a composite microstructure broach imitating crab claw hair and a preparation method thereof. In the cylindrical pit-shaped microstructures of odd-numbered rows opened on the front blade face and the rear blade face of each blade tooth of the present invention, carbon fibers are planted, in the cylindrical pit-shaped microstructures of even-numbered rows, nylon fibers are planted, and in the cylindrical pit-shaped microstructures opened on the two blade side faces of each blade tooth, lead and copper mixed fibers are planted. Based on the study of the functions and distribution of crab claw hair, the present invention obtains the distribution form of microstructure imitating crab claw hair, opens microstructures on the front blade face, the rear blade face and the two blade side faces of each blade tooth of the broach, and imitates the different functions of crab claw hair, implants carbon fibers or nylon fibers in the microstructures at different positions of the front blade face and the rear blade face, so that the surface of the broach has the functions of wetting, lubrication and liquid self-transportation, and implants lead and copper mixed fibers in the microstructures of the two side blade faces, so that the broach has the functions of vibration suppression and cooling.

The present application relates to the technical field of cross-medium grasping, in particular to a bionic cross-medium grasping robot with rigid-flexible coupling variable stiffness material, which adopts a systematic architecture of "material-structure-control" trinity, and comprises: an end effector with a rigid-flexible coupling variable stiffness material layer and a bionic composite structure layer, a sensor array, an excitation device for applying a physical field to the rigid-flexible coupling variable stiffness material layer, and a controller. The controller is specifically configured to: fuse the signals of the sensor array to identify the current medium type; predict the future stiffness demand according to the historical sensor sequence; and control the excitation device to adjust the stiffness of the rigid-flexible coupling variable stiffness material layer, so that it switches between multiple modes including a compliant mode, a rigid mode and a locked mode. The rigid-flexible coupling variable stiffness material realizes large-range stiffness regulation, the suction cup-bristle composite microstructure realizes stable adsorption in dry / wet environments, and the multi-modal perception and LSTM prediction realize medium adaptive control.

The application discloses a numerical simulation method for laser surface remelting microstructure of particle reinforced magnesium matrix composite, and belongs to the technical field of numerical simulation of composite microstructure.The application solves the problem that the existing numerical simulation method does not fully consider the interaction between dendrite growth and particle movement.Based on the electron probe experimental characterization result, the application takes the real solid phase composition field of the as-cast state as the initial condition of calculation, more truly reproduces the actual solidification process, simultaneously carries out coupling calculation on the microstructure evolution and particle movement, adopts the cellular automaton technology to simulate the magnesium alloy existing the reinforcing particles, considers the influence of the dendrite growth on the particle movement, can realize the numerical prediction of the microstructure of the laser surface remelting particle reinforced magnesium matrix composite, and can more accurately predict the microstructure formation and particle migration in the molten pool in the laser melting metal process.The method can be applied to the numerical simulation of the microstructure of the particle reinforced magnesium matrix composite.

The application discloses a high-performance flexible piezoresistive pressure sensor and a preparation method, relates to the technical field of flexible pressure sensing, and comprises an upper flexible packaging layer, an upper sensing electrode, a composite microstructure sensing layer, a lower sensing electrode and a lower flexible packaging layer. The composite microstructure sensing layer is provided with an array of concave micro-hemispheres arranged symmetrically upwards and downwards. By utilizing the stress concentration effect of the concave structure and the synergistic deformation mechanism of the elastomer material, efficient transformation of the microstructure from linear contact to stable surface contact during the pressure process is realized. Compared with traditional plane, convex or pointed microstructure, the application significantly improves the pressure response sensitivity, and the symmetrical structure ensures the uniformity of deformation and the stability of signal output, effectively solves the problems of low pressure area response insensitivity and signal drift in the prior art, and is especially suitable for dynamic pressure detection scenes.

The utility model provides an annular composite microstructure function lens, which solves the problem that the existing out-of-focus lens cannot adapt to different out-of-focus conditions of eyeballs and the like, and comprises a main lens, the main lens is provided with a correction area, a first composite area, a second composite area and a peripheral area which are arranged one by one from inside to outside, microstructures are distributed on the first composite area and the second composite area respectively, ring structures are arranged among the correction area, the first composite area and the second composite area, and the ring structures are sequentially divided into a plurality of concentric areas from inside to outside. The myopia correction device has the advantages of good myopia correction effect, good adaptability and the like.