41results about How to "Good diffraction" patented technology

Method/system locate external articles using source, detector (PSD), entrance aperture, and magnifying/reducing afocal element—expanding FOR>90°, or refining precision. Between (1) source or detector and (2) aperture, at least one plural-axis-rotatable mirror addresses source/detector throughout FOR. ½- to 15-centimeter mirror enables ˜25 to ˜45 μradian beam divergence. Aperture, afocal element, and mirror(s) define source-detector path. Mirror(s) rotate in refractory- (or air/magnetic-) bearing mount; or mirror array. Auxiliary optics illuminate mirror back, monitoring return to measure (null-balance feedback) angle. To optimize imaging, auxiliary radiation propagates via splitters toward array (paralleling measurement paths), then focusing on imaging detector. Focal quality is developed as a PSF, optimized vs. angle; stored results later recover optima. Mirror drive uses magnet(s) on mirror(s). “Piston” motion yields in-phase wavefronts, so array dimensions set diffraction limit. Also: destructive reply; scaling optimizes acceleration vs. thickness; passive systems.

The light directed from a light source to a concave mirror and the light directed from a display device to an eyepiece optical system are intersected by each other in a layout. This allows the light source, the concave mirror, and the display device to be arranged in compactness adjacent to the eyepiece optical system without increasing the optical power of an illumination optical system. As the result, the apparatus can easily be minimized in the thickness or the overall size. A hologram optical element is provided where the relationship between the wavelength range Δλ1 at half of the diffraction efficiency of each of the three primary colors of the light in the hologram optical element and the wavelength range Δλ2 at half of the intensity of each of the three primary colors of the light emitted from the light source is defined by Δλ1<Δλ2. Accordingly, a component at desired wavelengths of each of the R, G, and B colors of the light emitted from the light source can be diffracted by the action of the hologram optical element and then directed to the pupil of the viewer. This allows the image to be increased in the color reproduction area and improved in the quality regardless of the display device actuated in a time-division mode.

The present invention provides a wavelength division multiplexing/demultiplexing optical transceiving assembly based on a diffraction grating, which is an uplink optical emitting unit and a downlink optical receiving unit that comprise a laser chip array, a light receiving detector array, a first fast axis collimating lens, a second fast axis collimating lens, a first slow axis collimating lens, a diffraction grating, a slow axis focusing lens, a second slow axis collimating lens, an optical isolator, a coupling output lens, a coupling input lens, a coupling outputting optical fiber and a coupling inputting optical fiber. The wavelength division multiplexing/demultiplexing optical transceiving assembly solves the technical problem of sharing a diffraction grating to realize a wavelength division multiplexing/demultiplexing function, achieves the beneficial effects of better diffraction grating filtering property, smaller light path coupling loss and insertion loss correlative with wavelength, larger independent optical element sizes, and simpler assembly process, and is more suitable for manufacturing a multi-channel wavelength division multiplexing/demultiplexing optical transceiving assembly.

The invention relates to a positioning system based on an RFID (Radio Frequency Identification Device) dual-frequency technology. The system comprises a server, RFID tags, a plurality of RFID readers and a plurality of low frequency triggers, wherein the RFID readers are respectively connected with the server through a concentrator; each RFID reader is distributed and disposed in a positioning area; the RFID tags are bound on a positioned object body; the low frequency triggers are installed in the RFID readers; and each RFID tag includes a low frequency receiving module and a radio frequency sending module. Compared with the prior art, full-area monitoring positioning in an indoor and outdoor complex environment is realized by use of organic combination of respective radio performance of RFID low frequency and microwaves, data of RSSI (Received Signal Strength Indicator) received by the tags, characteristics of automatic cycle of a signal gain sent by a tag antenna, meshed area setting and a three-point positioning method. The system can be applied to the fields such as finance, armies, logistics storage, medical care and the like and has positive application meaning for the present era of Internet of Things.

An optical arrangement includes a light source which emits coherent light of a wavelength λ, and a diffraction grating which has a multiplicity of diffraction structures which follow one another periodically at the spacing of a grating period d and are arranged along a base surface, the individual diffraction structures respectively having a blaze flank and an antiblaze flank, the blaze flanks being arranged at an angle β and the antiblaze flanks being arranged at an angle α to the base surface, and respectively neighbouring blaze and antiblaze flanks enclosing an apex angle γ, and an incident light beam being arranged at a Littrow angle θ_L relative to a grating normal of the diffraction grating. The angle β of the blaze flanks to the base surface is selected as a function of the Littrow angle θ_L such that the diffraction efficiency is at least approximately maximal in one of the largest diffraction orders m, which still fulfils the condition (2((m+1)/m)−1)sin θ_L≧1, and for at least one polarization direction.

The invention discloses a method and a device for preparing a coating by using nanosecond pulse laser cladding, belonging to the technical field of the preparation of coatings on material surfaces through laser cladding, and aiming to solve the problems existing in the present nanosecond pulse laser cladding. According to the method and the device, a metal is deposited on the surface of a workpiece through MOCVD (metal organic chemical vapor deposition), and the surface of the workpiece is scanned by nanosecond laser light at the same time, so that the metal is cladded on the surface of the workpiece, and a coating with a micron or submicron level thickness is formed on the surface of the workpiece. The method and the device disclosed by the invention do not have special requirements for a substrate material, are wide in application range, and can meet the needs of the preparation of the coatings of plane workpieces and special-shaped workpieces; a prepared thin film coating has the advantages of densification, controllable thickness (micron or submicron) and firm film-substrate adhesion; meanwhile, the surface roughness of the workpiece subjected to processing is not less than that of the workpiece before cladding; the secondary processing such as grinding and polishing is not needed, so that the production cost is reduced; meanwhile, after being processed by the method and the device, the workpiece can not be deformed and can meet the processing requirements for precision workpieces.

A structured color filtering device includes one or more unit cells. Each unit cell includes a substrate having a surface with a step function surface profile having two or more discrete levels formed therein. The step function surface profile forms in the surface a plurality of grooves arranged in a fundamentally symmetric pattern having a periodic groove pitch. When ordinary light is incident on the surface, the surface is structured to diffract light having a predetermined wavelength toward observation points at all polar angles above the surface greater than a predetermined incident angle.

The invention provides a method for forming a copper layer on a circuit board, and the method comprises the steps: providing a circuit board structure which is provided with a to-be-plated surface, wherein the to-be-plated surface is provided with a conductive region and a non-conductive region; and carrying out sputtering treatment on the to-be-plated surface, and forming a sputtering copper layer in the conductive region and the non-conductive region of the to-be-plated surface. According to the invention, a chemical plating process in a circuit board process in the prior art can be replaced.

The invention discloses a CrAlN thermal insulation coating for an aluminum alloy piston combustor surface and a preparation method thereof. The CrAlN thermal insulation coating comprises a transitionlayer and a thermal insulation layer from the inside out in order, the transition layer is a CrAl coating, and the thermal insulation layer is a CrAlN coating. The method adopts filtered cathodic vacuum arc technique, takes a CrAl alloy target material (Cr, Al metal target) as the cathode, performs deposition of the CrAl coating on the aluminum alloy surface to form a transition layer, then uses nitrogen as the working gas, and coats the transition layer surface with the CrAlN coating evenly to form the thermal insulation layer. The CrAlN thermal insulation coating provided by the invention not only solves the problem of poor binding force and bearing ability caused by large difference of basic physical properties between the CrAlN coating and the aluminum alloy substrate material, also the coating is uniform and compact, has good film-substrate combination state and hardness up to 40GPa, and shows good high temperature thermal insulation properties and thermal shock resistance in piston thermal load test. The CrAlN thermal insulation coating provided by the invention significantly improves the performance reliability and service life of the aluminum alloy piston, and can meet thehigh power and low emission development requirements of modern engines.

The invention discloses an array waveguide grating based on auxiliary waveguides, which comprises an input channel waveguide, slab waveguides, array waveguides and an output channel waveguide, the auxiliary waveguides are respectively added between the array waveguides and the slab waveguides adjacent to the array waveguides, the number range of the array waveguides is 10-20, the distance do of the array waveguides is within the range of 5-10 microns, the distance di of the input/output waveguide is 5-12 [mu]m, the diffraction series is 8-20, the length L of the auxiliary waveguide is 300-500 [mu]m, the width Win of the input end is equal to do-width, and the width Wout of the output end is 0.1-3 [mu]m. According to the array waveguide grating, light is better diffracted when entering the array waveguide from the slab waveguide, loss caused by mode mismatch is reduced, insertion loss of the array waveguide grating is reduced, bandwidth is increased to a certain extent, and the size of a device is not increased.

Provided a display apparatus including an image forming apparatus configured to form an image, a projection optical system configured to project the image formed by the image forming apparatus, and a combining optical system configured to provide the image projected from the projection optical system combined with light emitted from an external landscape, wherein the combining optical system is configured to divide the image projected from the projection optical system into same images and focus the same images on different positions.

The invention discloses a low-temperature-doped luminescent aluminum nitride thin film and a preparation method thereof. The method comprises the following steps: preparing a mosaic target, and placing the mosaic target on a magnetic filtration electric-arc-plating target; chemically cleaning the surface of a matrix; placing the matrix into an electric-arc ion plating machine, and vacuumizing until the background vacuum degree is less than 3.0*10-3Pa; adding bias voltage of -800V; starting a curved arc magnetic filter and the magnetic filtration electric-arc-plating target to perform argon arc plasma bombardment cleaning on the matrix; maintaining current of a magnetic filtration tube, current of the electric-arc target and duty cycle, regulating and controlling the bias voltage to -100 to -400V, introducing nitrogen, and film-coating for 30-90 minutes; and switching off the magnetic filtration electric-arc-plating target and the curved arc magnetic filter, and then taking out a sample to obtain the doped luminescent aluminum nitride thin film. During the preparation process, the temperature of the sample is not more than 180 DEG C, and diffusion heat treatment is not required after deposition. The invention has simple preparation process and easy operation, and electrical and mechanical automatic control can be used in the film-coating course.

The invention provides a flexible metal composite fiber porous material as well as a preparation method and application thereof, and relates to the technical field of metal porous materials. The flexible metal composite fiber porous material provided by the invention comprises a metal porous material flexible base layer and a tungsten deposition layer metallurgically bonded on the fiber surface ofthe metal porous material flexible base layer through magnetron sputtering or chemical vapor deposition. The metal porous material flexible base layer comprises metal fiber yarns, metal fiber fabrics, metal fiber cotton or metal fiber nets. According to the flexible metal composite fiber porous material provided by the invention, the tungsten layer is deposited on the metal porous material flexible base layer, the flexible base layer has good air permeability, flexibility and machinability, and the tungsten layer wraps the surface layer of the metal fiber, so that the flexibility of a core part is maintained, and the characteristics of thermal shock resistance, radiation resistance and the like of the tungsten layer can be fully exerted. According to the flexible metal composite fiber porous material provided by the invention, the flexibility of the tungsten fiber porous material is successfully realized.

The invention relates to an infant monitor, a nursing monitor and an infant monitoring method. The infant monitor a baby monitoring terminal worn on a baby, a guardian terminal carried by a baby guardian, and an independent wireless monitoring communication module arranged at the position away from the infant by a certain safety distance configured to receive information and parameters from the infant monitoring terminal in a wireless mode in the working process and transmit the infant information and parameters from the infant monitoring terminal to the held terminal. Thus, the defect that apresent monitor cannot effectively monitoring the sleeping state and vital signs of the infant is overcome, and the sleep and health of the infant can be ensured in a safer way.

The invention discloses an intelligent wireless thermostat which comprises a main control device and an execution device, wherein the main control device comprises a first controller, a temperature detection module, a first 433 communication module and a wireless communication module; the wireless communication module is used for wirelessly communicating with a cloud server; the first controller is electrically connected with the temperature detection module, the first 433 communication module and the wireless communication module; the execution device comprises a second controller, a second 433 communication module and a relay control module; the relay control module is used for controlling a valve to open and close; the second controller is electrically connected with the second 433 communication module and the relay control module; and the first 433 communication module is wirelessly connected with the second 433 communication module . By the adoption of the intelligent wireless thermostat disclosed by the embodiment of the invention, the wiring work difficulty can be effectively reduced and the wireless temperature control function of the intelligent wireless thermostat can beachieved. The invention further provides a heat pump heating system and a control method.

The invention belongs to the technical field of surface science and engineering, and particularly discloses a plastic surface low-temperature vacuum ion plating coating method which comprises the following steps: (1) carrying out ion beam sputtering cleaning and activation on the surface of a plastic workpiece by adopting a Hall ion source; (2) carrying out low-temperature vacuum ion plating on the surface of the plastic workpiece by adopting a vacuum magnetic filtering cathode arc source; and (3) later machining is conducted on the workpiece. The vacuum magnetic filtering cathode arc source is adopted to lead out high-purity ion flow with high energy and low flow density, deposition of the metal coating at the ultralow temperature of 75 DEG C or below on the surface of the plastic which is not resistant to temperature is achieved in the full-vacuum environment through a pure physical method, temperature rise of the plastic surface is effectively controlled, softening and deformation of a workpiece are prevented, and release of impurity gas is restrained; ablation damage of high-temperature large molten drops to a plastic workpiece is avoided, and the metal film prepared on the plastic surface is excellent in binding force and coverage rate.