1223results about How to "Reduce scatter" patented technology

The invention discloses a near-infrared laser scanning confocal imaging system, which comprises a light path scanning unit and a control unit which adopt a confocal structure, wherein the light path scanning unit comprises a near-infrared laser source, a collimation and extension module, a laser optical filter, a dichroic reflector, a scanning galvanometer, an f-theta lens, a tube lens, an imaging objective lens, a fluorescent optical filter, a convergent lens, a pinhole, a detector and the like, the control unit comprises a motion control module used for controlling the scanning galvanometer, a data acquisition module used for acquiring an output signal of the detector, a data processing module connected with the motion control module and the data acquisition module, and the like. The method matched with the system is characterized in that a sample is marked with near-infrared quantum dots with the fluorescence emission spectrums between 932nm and 1250nm, and then the sample is detected by the near-infrared laser scanning confocal imaging system. According to the system disclosed by the invention, deep-level imaging of samples such as biological tissues can be accurately and efficiently realized, and the system has a simple structure and is easy to operate.

A saturable absorber (SA) is constructed using a fiber taper embedded in a carbon nanotube / polymer composite. A fiber taper is made by heating and pulling a small part of standard optical fiber. At the taper's waist light is guided by the glass-air interface, with an evanescent field protruding out of the taper. Carbon nanotubes mixed with an appropriate polymer host material are then wrapped around the fiber taper to interact with the evanescent field. Saturable absorption is possible due to the unique optical properties of the carbon nanotubes. The device can be used in mode-locked lasers where it initiates and stabilizes the pulses circulating around the laser cavity. The SA can be used in various laser cavities, and can enable different pulse evolutions such as solitons, self-similar pulses and dissipative solitons. Other applications include but are not limited to optical switching, pulse cleanup and pulse compression.

This invention relates to cholesteric liquid crystal (LC) displays comprising cells of well-defined shape, size and aspect ratio which cells are filled with a liquid crystal composition preferably containing dichroic dye(s), and novel processes for their manufacture.

The invention provides a twinkling transparent ceramics with garnet structure and a preparation method thereof. The twinkling transparent ceramics is characterized in that oxysalt of the garnet structure is taken as substrate, and the structural formula of the garnet structure is 3mR, 3nR': (A(1-m-n-x) A'x)3 (By C(1-y))5 O12, wherein, m and n are more then or equal to 0 and less than or equal to 0.1, x is more than or equal to 0 and less than or equal to 1, and y is more then or equal to 0 and less than or equal to 0.4; one or combination in Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb, Cr, Ti and Mn can be taken as luminous ion. The product uses high-purity material (being more than 99.99%) for high-energy ball milling to process powder by being added with sintering accessory ingredient and combining vacuum sintering, so that the twinkling transparent ceramics with high optical quality can be obtained. In visible light area, the twinkling transparent ceramics has the transmission reaching 80% or above, and the stimulated emission peak is matched with sensitizing range of a photoelectric detector. The twinkling transparent ceramics is a scintillating material having application prospect in the field of detecting high-energy rays (such as electron, alpha and beta particles, x-ray, gamma-ray and the like). The invention can be applied to an electron microscope, a counter, a ray imaging screen and the like, and has the advantages of simple technique, low production cost, etc.

Disclosed is a manufacturing method for a stepped imaging directional backlight apparatus which may include a structured optical film and a tapered body. The structured optical film may include multiple optical functions and may be assembled by folding onto the tapered body, reducing cost and complexity of manufacture.

The invention discloses a method for acquiring a laser meat image by a double-laser triangle method. The method comprises the following steps of: 1) establishing a view field; 2) storing a gradient different between a laser meat curve and a laser plane reference curve which serves as meat thickness information to be a laser image meat thickness curve, and combining multi-frame laser meat thickness curves into a laser image according to an acquisition sequence; 3) unifying two laser images acquired by a left charge coupled device (CCD) camera and a right CCD camera to be under the same coordinate; and 4)splicing the laser images acquired at left and right angles under the unified coordinate into the same laser image to form a complete meat laser image.

The invention discloses an antenna for reducing a radar scattering cross section, aiming to solve the problem of large radar scattering cross section of the traditional microstrip antenna. The antenna comprises a dielectric slab (1), a microstrip radiating unit (2) and an earth plate (3), wherein the microstrip radiating unit is arranged at the upper surface of the dielectric slab, and the earth plate is arranged at the lower surface of the dielectric slab; both sides of the microstrip radiating unit are provided with a high impedance surface array (4) respectively; each high impedance surface array is formed by arranging a plurality of metal chips into a rectangle, a gap is arranged between the adjacent metal chips to form a capacitor C; the center of each metal chip is provided with a metal via hole which penetrates through the dielectric slab; a current path connected by the via holes can form an inductor L, and the capacitor and the inductor form an LC resonant circuit; the frequency of the resonant circuit can be adjusted to be coincident with the working frequency of the antenna, thus realizing scattered field compensation of the high impedance surface array and the antenna. The invention has stable performance of reducing radar scattering cross section within and outside the frequency band of the antenna, and also has no effect on the size, weight and cost of the antenna.

The invention provides a method for manufacturing triangular groove echelon gratings with 90-degree vertex angles. Each triangular groove echelon grating is composed of a silicon grating structure (1), photoresist (3) and a metal film (4). A manufactured grating groove is a triangle with the vertex angle being 90 degrees, so that the diffraction efficiency higher than that of an echelon grating with the vertex angle being not 90 degrees can be achieved. Each grating structure is produced in an obliquely-cut monocrystalline wafer, the shining angles of the gratings are determined by an obliquely-cut angle for cutting each silicon wafer, and gratings with any blazing angles can be manufactured; according to the 90-degree vertex angles, grooves of silicon gratings with the vertex angles being not 90 degrees are filled with photoresist, then photoetching is conducted again, and the original silicon gratings with the vertex angles being not 90 degrees are converted into the triangular groove gratings with the vertex angles being 90 degrees. According to the manufactured grating structure, the shining face of each grating is a smooth monocrystal silicon <111> grate plane, scattering can be effectively lowered, and the diffraction efficiency of each grating is improved. The purpose that all the gratings have high diffraction efficiency on a broadband is achieved according to the fact that using wave bands can choose to be coated with various different reflecting film layers on the surfaces of the gratings.

The present invention provides a hologram recording material which attains high refractive index change, high sensitivity, low scattering, environment resistance, durability, low dimensional change and high multiplicity, and is suitable for volume hologram recording; a process for producing the hologram recording material; and a hologram recording medium. A hologram recording material comprising a metal oxide matrix and a photopolymerizable compound, said metal oxide matrix having a halogen-containing organic group. The metal oxide matrix is formed by hydrolysis and polymerization reaction of a metal alkoxide compound, and said metal alkoxide compound includes a metal alkoxide compound represented by the following general formula (1): (RH)mM(OR)n   (1) wherein RH represents the halogen-containing organic group, R represents an alkyl group, M represents a metal atom, m represents 1 or 2, and m+n represents the valence of the metal atom M.

The invention relates to the technical field of performance enhancing and functionalization of carbon nanocomposite materials, in particular to a polymer thermal conductive film containing uniformly dispersed and highly oriented graphene and a preparation method thereof. The thermal conductive film material is composed of the following components: a polymer matrix, graphene, second thermal conductive filler, a surface treatment agent, a filler coating agent and a processing aid. A technical route combining "high shear melting dispersion" and "high stretching" is employed to promote the uniformdispersion of graphene nanosheets and other thermal conductive filler in the polymer matrix and the acquisition of high orientation, graphene itself is utilized to construct a long-range continuous and three-dimensional hybrid thermal conductive network structure, thus overcoming the anisotropy of graphene, and constructing a stable and effective thermal conductive network.

An embodiment of the invention provides a display panel and a display device. The absorption and scattering functions of an organic film layer in the light ray propagation process are reduced throughthinning treatment of a partial area of the thicker organic film layer of the display panel, the effective transmission rate on the display panel is increased, and loss and crosstalk of light ray signals after light rays pass by an organic film in the fingerprint recognition process are reduced, so that the sensitivity and the recognition accuracy of light-sensing fingerprint recognition are improved.

The invention belongs to the technical field of microwave and millimeter wave testing, relates to the reflectivity testing of wave absorptive materials of microwave and millimeter wave, and provides a testing device that measures the reflectivity of the wave absorptive materials according to an arc method. Compared with existing reflectivity testing devices of the wave absorptive materials with arc methods, the invention provides an arc rail that consists of a first ally arm (7) shaped like a character '7' and a second ally arm (8) and can rotate around a rotating shaft of an electric rotating motor (12). When utilized in the reflectivity measurement of different incident angles, the testing device has ultra-convenient angle control and fixed radiuses of the ally arms, and can reduce the testing error that is caused by radius change. After adopting the structure that is shaped like the character '7', the testing device has reduced volume, and consequently can effectively reduce the disperse emission that is caused by an antenna fixing frame, raises measuring precision, and is convenient for loading, unloading, transportation and storage.

The invention discloses an automatic positioning method for a cable local discharge single end of an OWTS (Oscillating Wave Test System) detection device. The automatic positioning method comprises the following steps of: extracting a positioning parameter containing positioning information from test data saved in an OWTS local discharge detection device; enabling the positioning parameter to generate a graph of sampling points; respectively setting waveform sections corresponding to wave crests in the graph as original pulses; then searching the waveforms matched with the original pulses from the graph; calculating the time difference between the wave crests matched with the waveforms and the wave crests of the original pulse; and calculating the position of a fault according to the time difference. The invention also provides an automatic positioning system for the cable local discharge single end of the OWTS detection device. By using the technology disclosed by the invention, the fault pointing result of the cable is more intensive and scatter points are reduced, so that more accurate positioning analysis result is obtained, automatic analyzing and positioning can be carried out and costs of labor consumption and positioning are reduced.

The present invention provides a hologram recording material which is suitable for volume hologram record and can attain high refractive index change, flexibility, high sensitivity, low scattering, environment resistance, durability, low dimensional change (low shrinkage) and high multiplicity in holographic memory record using not only a green laser but also a blue laser; and provides a hologram recording medium having a hologram recording layer comprising the hologram recording material. A hologram recording material comprising a metal oxide matrix and a photopolymerizable compound, wherein the metal oxide matrix comprises at least Si and Ti as metallic elements, and Ti originates from titanium-containing oxide fine particles. A hologram recording medium (11) having the hologram recording layer (21) comprising the hologram recording material.

The present invention provides a hologram recording medium which is suitable for volume hologram record and can attain high refractive index change, flexibility, high sensitivity, low scattering, environment resistance, durability, low dimensional change (low shrinkage) and high multiplicity in holographic memory record using not only a green laser but also a blue laser. A hologram recording medium (11) comprising at least a hologram recording layer (21), wherein the hologram recording layer contains a metal oxide matrix comprising metal oxide fine particles, and a photopolymerizable compound; the metal oxide fine particles comprise metal oxide fine particles containing Ti as a metallic element; and at the time of subjecting the hologram recording layer before exposure to light to an extraction operation in n-butyl alcohol having a mass 100 times the mass (W) of said recording layer, thereby yielding a sol solution; filtrating the sol solution to obtain a filtrated sol solution; and measuring particle diameter distribution of sol particles in the filtrated sol solution by a dynamic light scattering method; and obtaining an average particle diameter thereof, the average particle diameter of the sol particles is in the range of 5 nm or more and 50 nm or less.

The invention relates to the blue light-emitting device of III group nitrogen semi-conductor. Clads on the two sides of the active area includes at least one strained layer superlattice structure. Comparing with general AIGaN clad, the structure can eliminate the defect caused by the mismatch between GaN and the crystal lattice of the substrate so as to improve the crystal perfection and confine carriers in the active area effectively and uniformly. Thus, the combined luminous efficiency and the uniformity are raised.

The present invention provides a hologram recording medium wherein high refractive index change, flexibility, low scattering, environment resistance, durability, low dimensional change (low shrinkage), and high multiplicity are attained in holographic memory recording using a blue laser as well as a green laser. A hologram recording medium comprising at least a hologram recording layer, wherein the hologram recording layer (21) contains at least an organometallic compound which contains a metal atom, an organic group, and an oxygen atom, and has a direct bond between the metal atom and a carbon atom in the organic group (a metal-carbon bond), and a bond between the metal atoms through the oxygen atom (a metal-oxygen-metal bond) and a photopolymerizable compound; and the hologram recording layer (21) contains the metal atoms in an amount of 3.0% by mass or more and 20% by mass or less with respect to the hologram recording layer.

The embodiment of the invention provides a color film substrate and a display device, and relates to the technical field of display. The efficient light filtering effect can be achieved, and the backlight utilization rate is increased. The color film substrate comprises multiple pixel units. Each pixel unit comprises a blue sub-pixel, a green sub-pixel and a red sub-pixel. Each blue sub-pixel comprises a first photonic crystal layer on a substrate body and used for making blue light emitted to the color film substrate to pass. Each green sub-pixel comprises a second photonic crystal layer and a first light emitting medium layer which are arranged on the substrate body in sequence, wherein the first light emitting medium layer emits green light under the stimulation of the blue light, and the second photonic crystal layer is used for making the green light to pass. Each red sub-pixel comprises a third photonic crystal layer and a second light emitting medium layer which are sequentially arranged on the substrate body in sequence, wherein the second light emitting medium layer emits red light under the stimulation of the blue light, and the third photonic crystal layer is used for making the red light to pass. The invention further provides a preparation method for the color film substrate and the display device with the color film substrate.

The invention belongs to the technical field of preparation of micro-nano fibers and relates to an electrostatic spinning device with a spinning nozzle capable of doing a linear reciprocatingmotion; a stainless steel needle head is fixed on an injector needle tube and is connected with the anode of a high-voltage direct-current power supply; the cathode of the high-voltage direct-current power supply is connected with an aluminum foil collector; the aluminum foil collector is fixed on a base of the device; the injector needle tube is fixed on one end of a linear motion rod; the linear motion rod runs through two parallel brackets and is capable of doing harmonic linear motion on the brackets; and the other end of the linear motion rod is connected with an organic glass plate by a crankshaft connection rod. The electrostatic spinning device has the advantages of multiple functions, concentrated spinning distribution and good ordering, small spinning distance, high yield, low working voltage, and the like.

The invention provides a microwave anechoic chamber performance measuring method, which comprises the following steps of: adopting a microwave anechoic chamber performance measuring system, and setting a dead zone parameter, a measuring frequency, a signal source power, a scanning trace and a kinematic velocity of a receiving antenna, and a rotation direction and a rotation velocity of a transceiving antenna according to the requirements of a microwave anechoic chamber performance analysis test; driving a signal source according to the signal source power; driving each stepping motor to control each moving part to move according to the scanning trace and the kinematic velocity of the receiving antenna, and the rotation direction and the rotation velocity of the transceiving antenna; and controlling a signal receiver to receive a signal of the receiving antenna according to the measuring frequency, and storing the signal. The method can be adopted to be applied in a microwave anechoic chamber flexibly so as to measure along different scanning traces; and a computer is adopted to realize automatic measurement of microwave anechoic chamber dead zone reflectivity level, cross polarization character, multi-path loss uniformity, and field uniformity performance indexes, so that the measuring efficiency is improved.

The invention relates to the technical field of ceramic material preparation, and relates to a preparation method of high-thermal-conductivity aluminum nitride ceramic. According to the invention, aluminum nitride powder is adopted as a base material, and rare earth metal fluoride EuF3, LaF3, SmF3 or a mixture thereof is adopted as a sintering aid. An addition amount of the sintering aid rare earth fluoride accounts for 2-8% of the aluminum nitride powder by mass. Through the steps of wet milling mixing, drying, forming, degreasing and sintering, the aluminum nitride ceramic is formed. The aluminum nitride ceramic has thermal conductivity higher than 200W / m.K, flexure strength greater than 320MPa and a fine grain size. The method provided by the invention has the advantages of simple process, good product performance, low production cost, and the like.

The invention discloses a III-V group MOS (Metal-oxide Semiconductor) field effect transistor with high mobility, which comprises a single-crystal lining, a buffer layer formed on the single-crystal lining, a planar doped layer formed in the buffer layer, a high-mobility channel layer formed on the buffer layer, a doped interface control layer formed on the high-mobility channel layer, a high-doped semiconductor layer formed on the doped interface control layer, a narrow band gap ohm contact layer formed on the high-doped semiconductor layer, and a source-drain metal electrode formed on the narrow band gap ohm contact layer, wherein a grid groove etched to the doped interface control layer is located between two source drain metal electrodes; a high-K grid medium is uniformly covered on the inner surface of the grid groove structure; and a grid metal electrode is formed on the high-K grid medium. The III-V MOS device structure disclosed by the invention not only can lower MOS interface state density, and improve channel mobility, but also can improve channel two-dimensional electron (cavity) gas concentration, and satisfy the application demand of a high-speed lower voltage operation high mobility CMOS technology.

A catadioptric projection lens configured for imaging a pattern arranged in an object plane (2) onto an image plane (4) while creating a single, real, intermediate image (3) has a catadioptric imaging group (5) having a concave mirror (6) and a beam-deflector (7), and a dioptric imaging lens group (20) that commences after the beam-deflector. The system is configured such that the intermediate image follows the first lens (17) of a dioptric section (8) and is preferably readily accessible. Arranging the intermediate image both between a pair of lenses (17, 21) of the dioptric section and at a large distance behind the final reflective surface of the beam-deflector helps to avoid imaging aberrations.

The invention discloses a coating method of light-emitting diode (LED) fluorescent powder. The method comprises the following steps: performing crystal- bonding and wire-bonding of a LED chip on a support, using a precision automatic adhesive-dispensing device with a robot arm to draw colloidal box dam around the chip; forming a colloidal box dam through hot curing or ultraviolet curing; dispensing a defined amount of fluorescent powder adhesive in the box dam; and curing again to obtain the LED, wherein fluorescent powder is coated on part of the chip. By using the method of the invention, the uniformity of light colour of the white LED can be increased; and the adhesive thickness round the chip can be accurately controlled by using the box dam, thus the effect of white light-mixing in all directions is controlled, and yellow ring, blue ring and other non-uniform phenomena can not appear.

The invention belongs to the electromagnetic ultrasonic non-destructive testing field and discloses an electromagnetic ultrasonic transducer capable of reducing echo of magnet. The invention aims at solving the problem that reception is influenced by electromagnetic ultrasonic signal produced by the electromagnetic ultrasonic transducer in permanent magnet. A probe is composed of a permanent magnet, a shielding layer, a transmitting and receiving coil and a conductor test piece. By applying the shielding layer, intensity of ultrasonic signal produced by electromagnetic ultrasonic transducer in magnet can be effectively reduced, and by increasing surface roughness of permanent magnet and designing suitable permanent magnet shape, ultrasonic echo signal can be effectively dispersed, thus effectively reducing influence of ultrasonic wave produced in magnet on reception.

The invention discloses a nano insulating coating which is prepared from the following raw materials in parts by weight: 100 parts of an organosiloxane modified acrylic emulsion, 5-12 parts of a silicon dioxide aerogel, 1-2.6 parts of ceramic fibers, 1-2.5 parts of a carbon nano tube, 0.2-1 part of calcium silicate, 2-5 parts of nano zirconium oxide, 3-7 parts of nano zinc oxide, 5-9 parts of calcium carbonate whiskers, 15-20 parts of sepiolite, 5-20 parts of expanded perlite, 8-15 parts of nano titanium dioxide, 0.8-2.0 parts of a segmented copolymer, 1.5-3.8 parts of dodecanol ester, 0.2-5.0 parts of benzotriazole, 2-3.5 parts of a defoaming agent, 0.5-2 parts of glycerol, 0-1.5 parts of a thickener, 3-10 parts of a coupling agent and 30-60 parts of water. The nano insulating coating disclosed by the invention is good in insulation, high-temperature resistant, high in strength and pollution resistant and is strong in adhesive force and long in service life of building wall spaces and base bodies.

A light diffusing film for a back light display is described. The light diffusing film includes a unitary film consisting essentially of polycarbonate and a uniformly dispersed anti-static material in an amount sufficient to impart anti-static properties to the film. The anti-static material may comprise a fluorinated phosphonium sulfonate. The film may additionally include at least one textured surface for the low scattering of light. Alternatively, the film may additionally include a uniformly dispersed acrylic bulk scattering additive of particles having a mean particle size of from about 3 to about 10 microns and present in an amount from about 2 to about 7 percent by weight percent for the high scattering of light.