199 results about "Light diffraction" patented technology

The invention discloses an all-optical vortex beam orbital angular momentum mode identification method and system, and relates to the field of optical information processing and optical computing, and the method comprises the steps: S1, constructing a multi-layer architecture all-optical diffraction network; s2, dividing the output detection surface after the diffraction network into a plurality of preset space regions; s3, the vortex light beams carrying orbital angular momentum OAM information sequentially penetrate through the all-optical diffraction network, spatial evolution of a light field in the propagation process is completed, and vortex light classified according to intensity distribution is output; s4, mapping the topological charges of the vortex light to different sub-regions of the detection surface in an intensity distribution form; and S5, performing intensity acquisition on each area on the detection surface through a detector, and determining an OAM mode type of the input light field based on the mode number corresponding to the area with the maximum light intensity. The method is used for performing high-robustness identification on the orbital angular momentum vortex light mode of the vortex light in the presence of a random phase scattering medium.

The invention relates to a glass heating system, a heating wire arrangement method and device and a vehicle, and belongs to the technical field of vehicles. The system comprises a glass body, a camera module and a heating wire, wherein the camera module comprises a first camera and a second camera, the visual field area of the first camera is located in the visual field area of the second camera, and the overlapping area between the visual field area of the first camera and the glass body is a first area; the arrangement position of the heating wire on the glass body does not comprise the first area. Therefore, in the scheme, the arrangement position of the heating wire can avoid the first area, that is, the overlapping area between the view area of the first camera and the glass body is avoided, so that the light diffraction phenomenon does not occur in the first area, the influence of the light diffraction phenomenon on the imaging quality of the first camera is avoided, the imaging quality of the first camera is favorably improved, and the imaging quality of the first camera is improved. Particularly, under the application scene that the camera module is used for intelligent driving, the safety of intelligent driving is improved.

An electronic device may include a waveguide that directs light to an eye box. The waveguide may include a diffractive grating structure. A projector may generate image light coupled into the waveguide by a first input coupler. A light source may generate supplemental light coupled into the waveguide by a second input coupler. The diffractive grating structure may couple the image light out of the waveguide within a central region of the field of view (FOV) of an eye box and may couple the supplemental light out of the waveguide at a location within a peripheral region of the FOV. The location may be outside of the central region by at least 10 degrees. A gaze tracking sensor may estimate a user's gaze direction at the eye box. A processor may wake or power down the projector responsive to the gaze direction overlapping the location for a predetermined time period.

Systems and methods for performing contactless wellhead displacement measurements include receiving a shadowgraph from an imaging sensor based on a shadow generated by a portion of a wellhead blocking light from a coherent infrared light source, the infrared light having a wavelength away from water absorption wavelengths and solar maxima wavelengths. A feature is detected in the shadowgraph based on interference patterns in the shadowgraph caused by diffraction of the light. The feature represents an edge of the portion of the wellhead. A displacement of the wellhead is measured based on the location of the feature in the shadowgraph and a previously detected location of the feature.

An apparatus is provided. The apparatus includes a light guide configured to guide a first light to propagate in the light guide. The device also includes an optical film coupled with the light guide, the optically anisotropic molecules in the optical film being configured with an in-plane orientation pattern having an in-plane pitch along a predetermined in-plane direction. Azimuth angles of the optically anisotropic molecules are configured to vary non-linearly in a predetermined in-plane direction within in-plane pitches of the in-plane orientation pattern. The optical film is configured to diffract the first light into a plurality of second light at a plurality of predetermined different diffraction efficiencies at a plurality of positions of the optical film.

A display system includes a display region configured to form an image thereacross for viewing by a viewer and including a light emitting region configured to emit light and a light non-emitting region not configured to emit light; and a light diffractive layer configured to be between the viewer and the display region and disposed substantially parallel to, and spaced apart along a thickness direction of the display system from, the display region. The light diffractive layer includes a light diffractive region configured to diffract light and a light non-diffractive region not configured to diffract light. The light diffractive and non-diffractive regions of the light diffractive layer are aligned, and substantially coextensive in length and width, with the respective light non-emitting and emitting regions of the display region.

An optical computing device includes: one or more light-diffraction elements each of which includes microcells, wherein each of the microcells has an individually set thickness or refractive index; and an optical signal input section that simultaneously inputs an optical signal and a delayed optical signal obtained by delaying the optical signal to the one or more light-diffraction elements.

An illuminated glass element, including a glass pane with a first surface, a second surface, and a side edge face extending therebetween. The glass pane is equipped with at least one light source, which is suitable for coupling light into the glass pane such that the light propagates in the glass pane, in particular by total reflection at the first surface and the second surface. The glass pane is provided with at least one light-scattering structure, which is suitable for coupling said light out of the glass pane via the first surface and / or via the second surface. The glass pane is also provided, in a peripheral edge region, at least in sections, with a light trap, which is suitable for reducing the emission of the light via the side edge face. The light trap is formed from a light-scattering or light-diffracting layer on the first surface and an opaque element on the second surface.

A method includes obtaining, using at least one under display camera, one or more first image frames associated with a first diffraction pattern and one or more second image frames associated with a second diffraction pattern. The first diffraction pattern and the second diffraction pattern are related through a transformation. The method also includes generating a first deblurred image using the one or more first image frames and a second deblurred image using the one or more second image frames. The method further includes combining the first and second deblurred images while exploiting complementary types of image artifacts created by the first and second diffraction patterns to generate an image of a scene.

The embodiment of the invention provides an exposure system for a wafer edge and a photomask contained in the exposure system. The photomask includes a frame, an opening surrounded by the frame, a phase inversion layer underlying the frame, and an intensity attenuation layer underlying the phase inversion layer. An inner sidewall of the phase inversion layer and an inner sidewall of the intensity attenuation layer are exposed to the opening. An inner sidewall of the phase inversion layer and an inner sidewall of the intensity attenuation layer extend beyond an inner sidewall of the frame in a first direction. According to the invention, the structure with optical phase inversion and intensity adjustment is used to improve the problem of light diffraction at the edge of the wafer.

The invention relates to the technical field of metering characterized by adopting an optical method, solves the problem that measurement results are unstable and inaccurate due to the fact that measurement of absolute positions in the prior art is easy to interfere, and provides a measurement system and a measurement method based on light interference. The optical path maintaining device guides the initial light beam to the light diffraction device and guides the diffraction pattern generated by the light diffraction device to the light capturing device, and the diffraction pattern is obtained by modulating the initial light beam through the light diffraction device, so that the diffraction pattern contains specific coding information, and interference caused by subsequent environmental noise can be reduced. The light capturing device collects diffraction patterns and sends generated interference image signals to the calculation control device, due to the fact that the diffraction patterns corresponding to different position information are different, the generated interference image signals are different, and based on a pre-established image displacement model, the position information of the light capturing device is calculated. And the calculation control device processes the interference image signal to obtain a more accurate displacement measurement result.

A light diffraction element unit includes an optically-transparent substrate; a light diffraction element disposed on a main surface of the optically-transparent substrate; and a three-dimensional alignment mark disposed on the main surface in a vicinity of the light diffraction element and having a thickness greater than a thickness of the light diffraction element.

An optical computing system includes: an intensity modulation device group including at least two intensity modulation devices, each of which includes modulation cells, wherein each of the modulation cells of each of the intensity modulation devices carries out intensity modulation with respect to carrier light in accordance with one of signals to generate a signal light beam, and each of the signals corresponds to each of the intensity modulation devices; and a light diffraction element including diffraction cells having respective thicknesses or refractive indices set independently of each other, wherein each of the diffraction cells receives the signal light beam from each of the modulation cells of each of the intensity modulation devices corresponding to each of the diffraction cells, and by causing signal light beams to have respective different optical path lengths to the light diffraction element, the signal light beams have respective different phases.

The invention provides an angular spectrum laminated on-chip microscopic imaging system and method, and the method comprises the steps: respectively filtering and intercepting diffraction object light in different angular spectrum intervals through an angular spectrum filter, carrying out the optical coding, and collecting an object light diffraction image formed by the coding of the corresponding angular spectrum interval on an image sensor; and the synthetic angular spectrum information of the object is decoded through an angular spectrum lamination iterative algorithm, and finally, large-view-field and high-resolution object amplitude and phase distribution which are not constrained by the aperture of the imaging system are reconstructed.

The invention discloses an electro-dimming thin film with a composite grating structure. The electro-dimming thin film comprises a lower substrate, a plane dimming layer, a grating dimming layer and an upper substrate which are sequentially arranged from bottom to top. The plane dimming layer comprises a lower plane transparent electrode, a dye liquid crystal and an upper plane transparent electrode, and a flexible filler and a lower transparent spacer are arranged between the lower substrate and the plane dimming layer; the grating dimming layer comprises at least one level of grating structure, each level of grating structure is provided with a grating lower electrode, a grating liquid crystal and a grating upper electrode which are independently controlled, an isolating layer is arranged between every two adjacent electrodes, and the grating structures are filled with grating layer flexible filler. The electro-dimming thin film with the composite grating structure has the beneficial effects that the electro-dimming thin film with the composite grating structure realizes multi-dimensional regulation and control from basic shading to accurate light diffraction through layered design and multi-stage control, and has remarkable application value in the fields of intelligent glass, display equipment and the like.

The invention discloses an extreme ultraviolet spectrograph calibration method based on extreme ultraviolet diffraction, and relates to the technical field of spectrograph calibration, and the technical scheme is characterized in that a desktop type XUV light source generation device is used for generating XUV light beams; a diffraction device is arranged on the propagation path of the XUV light beam, so that the XUV light beam is diffracted; taking the FID spectral line of the helium atom 2p-1s as an energy reference point, and deducing part of unknown parameters of the diffraction device and the spectrometer according to the separation distance of + / -1 level diffraction beams measured at the position corresponding to the energy; in combination with a Gaussian fitting method, the positions of 0-level light beams and + / -1-level diffraction light beams at other positions on the detector are obtained, and according to a diffraction formula, energy corresponding to all positions on the XUV spectrometer is inverted; calibration precision is ensured by correcting copper mesh placement angle deviation and CCD image angle deviation. According to the invention, XUV light is diffracted by using the copper net, and global continuous calibration of the energy axis of the spectrometer is realized by combining with a characteristic spectral line with a known wavelength.

A display system includes a display including a plurality of pixels where each pixel includes a plurality of subpixels; and a diffractive off-axis collimation layer disposed on the display. The diffractive off-axis collimation layer includes diffractive regions configured to diffractively transmit light and non- diffractive regions configured to non-diffractively transmit light. The diffractive and non-diffractive regions are arranged relative to the subpixels so that the diffractive off-axis collimation layer at least partially collimates light along a first off-axis direction making an angle of at least 5 degrees with a thickness direction of the display.

Embodiments of the present disclosure relate to supporting large field of view waveguides for red, green, and blue on a single panel. An optical device for combining RGB light signals in a single waveguide. The device includes a plurality of DOEs. A first DOE is configured to receive a light signal at an input propagation angle and diffract the light signal based on a spectrum such that light of one spectrum is primarily diffracted in a first direction and path and light of a second spectrum is primarily diffracted in a second, different direction and path. The first DOE is configured to diffract the light into a second DOE. The second DOE is configured to diffract the light into a third DOE. The third DOE is configured to diffract the light into an eyebox that maintains an output propagation angle substantially parallel to the input propagation angle. A sum of grating vectors for each path is substantially equal to zero.

A computer-free system and method is disclosed that uses an all-optical image reconstruction method to see through random diffusers at the speed of light. Using deep learning, a set of transmissive layers are trained to all-optically reconstruct images of arbitrary objects that are distorted by random phase diffusers. After the training stage, the resulting diffractive layers are fabricated and form a diffractive optical network that is physically positioned between the unknown object and the image plane to all-optically reconstruct the object pattern through an unknown, new phase diffuser. Unlike digital methods, all-optical diffractive reconstructions do not require power except for the illumination light. This diffractive solution to see through diffusive and / or scattering media can be extended to other wavelengths, and can fuel various applications in biomedical imaging, astronomy, atmospheric sciences, oceanography, security, robotics, autonomous vehicles, among many others.

A method for identifying an unknown target in a complex environment by using an all-optical diffraction neural network is characterized in that the adopted all-optical diffraction neural network is composed of multiple layers of phase-type diffraction optical elements, multiple wavefront regulation and control can be performed on a light field corresponding to an input image, and classification and identification of the image are completed in an optical domain after diffraction propagation of a certain distance; on the basis of a diffraction neural network, an anti-interference recognition mechanism is provided, concepts of a target object and an interferent which need to be specifically classified are provided in a diffraction neural network training stage, and a loss function and a constraint condition are set respectively; in combination with a wavelength multiplexing mechanism, different target object classification tasks are independently processed under different wavelength channels, so that classification results of all wavelength channels are integrated in a full-wave band range, the classification task of unknown targets in a complex environment is realized, and the advantages of high speed and low energy consumption of the all-optical diffraction neural network are exerted. The limitations of simple application scene, small target number and the like of the optical neural network are overcome.

An eyewear device includes a lightguide having a world-side surface and an eye-side surface, a display oriented to emit light toward the lightguide, and a beam steering element that includes a first polarization grating positioned along an optical path between the display. The first polarization grating diffracts light emitted by the display into orders having different polarizations and the orders are selectively conveyed into different eyeboxes. The eyewear device also includes a frame that supports the lightguide, the display, and the first polarization grating. In some cases, the different polarizations include a right circular polarization or a left circular polarization and the beam steering element includes a polarization dependent filter that filters right circularly polarized light in a first state and left circularly polarized light in a second state.

The present invention provides an early strength material comprising calcium formate powder, wherein, in the volume cumulative particle size distribution of the calcium formate powder determined by laser diffraction scattering method, 90% of the particles have a particle size (D90) of less than 1200 μm.

The application provides a reconfigurable mask and a reconfiguration method. The reconfigurable mask comprises: a mask array comprising at least one light modulation unit; and a driving module connected to each light modulation unit, the driving module being configured to provide a driving voltage for each light modulation unit. The light modulation unit comprises: a light modulation component comprising a phase modulation layer, the phase modulation layer being configured to change the phase of incident light based on the input driving voltage; and an output, the output being configured to output the incident light with the changed phase. Based on the reconfigurable mask, the target light field pattern can be iteratively learned and optimized based on the back propagation principle of the light diffraction neural network model, and the voltage parameters of the light diffraction neural network model can be optimized and configured through the electro-optic phase modulation technology to generate the driving voltage. In this way, through a modulable mask, the target light field pattern is taken as the iterative learning target, different wafer patterns are realized, the reconfigurable mask is multiplexed, and the manufacturing cost is saved.

A transparent display panel and a transparent display device including the same are disclosed. A transparent display panel includes a substrate having a display region including a plurality of light-emitting regions and a plurality of transmissive regions; and a plurality of line regions disposed over the substrate and extending across the display region, wherein an outer contour of each of the transmissive regions is at least partially curved or wherein each of the transmissive regions has a polygonal shape, and all internal angles of the polygon shape are obtuse. Thus, parallel regularity and periodicity of array of transmissive regions are avoided wherein a haze value is reduced by reducing or minimizing occurrence of light diffraction, and thus, clarity or visibility of an image is improved.

The invention relates to the technical field of lithium battery positive electrode materials, in particular to a single-crystal ternary positive electrode material, a preparation method thereof and positive electrode slurry. The single crystal ternary positive electrode material meets the following requirements: (1) X = Dv1 / Dv50; wherein X represents particle consistency, and X is not less than 0.2; (2) Y = (Dv1 '-Dv1) / Dv1'; wherein Y represents the agglomeration ratio of the micro powder and is not greater than 0.25. Wherein the Dv1, the Dv50 and the Dv1'are obtained by testing according to a GB / T 19077-2016 particle size distribution laser diffraction method; ultrasonic dispersion is not adopted during Dv1'testing; and ultrasonic dispersion is adopted when the Dv1 and the Dv50 are tested. The single-crystal ternary positive electrode material is low in micro powder content and easy to disperse, and the amount of bubbles in positive electrode slurry can be greatly reduced on the basis of not adopting a defoaming agent.

The invention provides a standardized detection method and device for the particle size of sand riverbed sediment. According to the standardized detection method for the particle size of the sandy riverbed sediment, efficient pretreatment and intelligent classification of the sandy riverbed sediment sample can be achieved, the advantages of a laser diffraction method and a dynamic image method are combined, the wide grading range is covered, and the particle size detection precision and the data comparability are improved.

The invention discloses an oil-gas-water mixed transportation metering device which comprises a main mounting pipe, one end of the main mounting pipe is provided with a first flow guide cover through a bolt, the input end of the first flow guide cover is communicated with an input pipe, and the other end of the input pipe is provided with a straight pipe type Coriolis mass flow meter through a bolt. The input end of the straight pipe type Coriolis mass flowmeter is communicated with a communicating pipe; liquid flows in the main installation pipe, the fluid model is calculated and measured through a plurality of optical measurement sensors with contrast light and without contrast light sources in the first installation pipe, and light diffraction, reflection and other conditions are collected through a transparent window of an embedded quartz window. The total mass flow rate and the branch mass flow rate are respectively measured by matching with system calculation integration, the overall accuracy is improved, the structural size is small, the application range is wide, use in various scenes is facilitated, and the overall use effect is improved.

The invention discloses a method for measuring the mesh number of filter cloth, which comprises the following steps: laser is emitted to the filter cloth to obtain a diffraction image of the filter cloth, the diffraction image comprises a plurality of diffraction bright spots which are periodically distributed, and each diffraction bright spot corresponds to one hole in the filter cloth; measuring a first distance between adjacent diffraction bright spots; the number of the filter cloth is calculated based on the first distance, a preset second distance and the wavelength of the laser through a preset target formula, the target formula is used for representing the function relation between the number of the filter cloth and the second distance and the function relation between the first distance and the wavelength of the laser, and the second distance is the distance between a receiving screen for receiving the diffraction image and the filter cloth. According to the method, the naked eye identification error caused by too small aperture in the filter cloth in a traditional visual inspection method is avoided, namely, the deviation between the mesh number of the filter cloth and the actual mesh number of the filter cloth is reduced, and the measurement accuracy of the mesh number of the filter cloth is improved.

Display device in a vehicle, comprising a holographic film (2; 2a, 2b, 2c, 2d); and a projector (4; 4a, 4b) arranged such that it emits at least some light in the direction of the holographic film (2; 2a, 2b, 2c, 2d); wherein the holographic film (2; 2a, 2b, 2c, 2d) is arranged on a disc (8, 9) of the vehicle; and wherein a black printing layer (6) is provided which is located on a side of the holographic film (2; 2a, 2b, 2c, 2d) opposite the projector (4; 4a, 4b) is arranged and overlaps an overlap area (10; 10a) of the holographic film (2; 2a, 2b, 2c, 2d), wherein the overlap area (10; 10a) is at least partially illuminated by the projector (4; 4a, 4b); wherein the holographic film (2; 2a, 2b, 2c, 2d) has at least one diffracting structure which diffractes light of a color corresponding to the diffracting structure coming from the projector (4; 4a, 4b) in the direction of a predetermined field of view (24; 26, 28) in the passenger compartment of the vehicle; wherein a diffracting structure for red light, a diffracting structure for green light and a diffracting structure for blue light are provided.

A position measurement encoder device includes a scale including a series of features readable by a read head to determine relative positions of the scale and the read head and diffract light into a plurality of diffraction orders; a readhead comprising a light source for illuminating the scale, and at least a first sensor configured to detect a signal generated at the first sensor by one or more diffraction orders generated by the scale; wherein the read head further comprises a diffraction order encoder that encodes the at least one diffraction order to have a different optical state than the optical state of the at least one other diffraction order.