134 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.

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.

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.

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 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.

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 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.

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.

Various waveguides and image display systems are disclosed herein. In an example, an image display system can include an optical engine configured to generate an image and a waveguide. The waveguide can have a light in-coupling region formed along a peripheral edge of the waveguide, the light in-coupling region including a first surface with a first set of diffraction gratings, and a light exit region formed along a top surface of the waveguide, the light exit region including a second set of diffraction gratings. The first set of diffraction gratings can be configured to diffract light towards the second set of diffraction gratings, and the second set of diffraction gratings can be configured to diffract light towards the user's eye.

A display system includes a display region including a plurality of pixels, and a light diffractive layer adjacent the display region. Each pixel includes non-overlapping first and second pluralities of subpixels, each including at least three different subpixels. The subpixels define non-overlapping first and second intra-pixel regions therebetween for each pixel. The pixels define an inter-pixel region therebetween. The subpixels and the first intra-pixel region define a first combined region, and the second intra-pixel regions and the inter-pixel regions define a second combined region. The light diffractive layer includes light non-diffractive and diffractive regions aligned with the respective first and second combined regions. The light diffractive layer can non-diffractively transmit light from some of the subpixels for some emission directions while diffractively transmitting light from other subpixels and / or for other emission directions. A luminance profile of the transmitted light can be symmetric about at least one plane.

Head-mounted displays with waveguides comprising surface relief gratings made of a transparent conductive material and methods for fabricating said waveguides are described herein. In an embodiment, a head-mounted display comprises an optical element and an image source that provides an image beam to an optical element. The optical element comprises a diffractive grating comprising a transparent conductive material. The diffractive grating diffracts light into, through, or out of the waveguide as well as absorbing any light that is not polarized in the direction of the diffractive grating.

The application provides a light diffraction neural network classification method and system based on ensemble learning, aiming to improve the object classification accuracy in a scattering medium environment, comprising the following steps: step 1, constructing and generating a simulation dataset suitable for light diffraction neural network training, the dataset containing a target object dataset and a scattering medium dataset; step 2, building multiple differentiated light diffraction neural network forward propagation models, and training each model based on the above simulation dataset; step 3, using a preset ensemble learning strategy to fuse the classification results output by the multiple light diffraction neural networks to improve the overall classification accuracy; step 4, driving the optical system to run, and outputting the classification result of the target object in real time according to the light field intensity data collected by the detector. The application introduces an ensemble learning mechanism to construct an anti-scattering classification strategy, effectively improving the object classification accuracy and robustness under the interference condition of static or dynamic scattering medium.

The present invention includes a focusing device comprising micro-diffraction elements configured to diffract incident light applied by a user into G focused beams, wherein each micro-diffraction element belongs to one of the G groups, the micro-diffraction element belonging to the g-th group of the G groups generates the g-th focused beam, the density distribution of the micro-diffraction elements belonging to the g-th group is adjusted to apply an arbitrary intensity distribution to the g-th focused beam before it is focused, the position of the micro-diffraction elements belonging to the g-th group is adjusted to apply an arbitrary wavefront to the g-th focused beam before it is focused, and G is 2 or greater.

The application relates to a route planning method of an unmanned helicopter based on a diffraction principle, and the steps are as follows: (1) constructing a terrain threat model T t , (2) calculating a track point optimization data set B, (3) preliminarily selecting an optimal flight route fpb, (4) dynamically adjusting the flight route, constructing a real-time flight route set, (5) updating the initial optimal route, and generating a real-time optimal route fpn, (6) improving the optimal initial route by adopting a cubic B-spline curve method and a route optimization algorithm, and realizing flight route flyability optimization. The application is a route optimization problem considering the terrain threat characteristics, flight safety and aircraft performance. The example results show that the light diffraction principle can realize automatic route generation in a complex threat environment, the method can provide effective flight service for the unmanned helicopter, and the flight safety and reliability are improved.

A light guide device according to an embodiment of the present invention comprises: a plate part in which light is totally reflected; a first diffraction part which is disposed on the plate part and on which the light is incident; a second diffraction part which is disposed on the plate part and in which the light is emitted from the inside of the plate part to the outside; and at least one third diffraction part which is disposed on the plate part and located between the first diffraction part and the second diffraction part, wherein the first diffraction part diffracts the light incident on the plate part toward the second diffraction part, and the third diffraction part diffracts, toward the second diffraction part, the light that is totally reflected in the plate part.

The application relates to the technical field of full-color photopolymer, and specifically discloses a full-color photopolymer film, a preparation method and application thereof. The full-color photopolymer film provided by the application specifically comprises 40-50 parts of writing monomers, 0.8-1.2 parts of photosensitizers, 4-7.2 parts of photoinitiators, 14-16 parts of polycaprolactone glycol, 21-25 parts of aliphatic polyether isocyanate, 4-6 parts of crosslinking agents, 0.3-0.6 parts of defoaming agents, 0.8-1.2 parts of anti-oxidation inhibitors, 0.8-1.2 parts of catalysts and 5-8 parts of solvents; the photosensitizer is composed of 2,5-bis((2,3,6,7-tetrahydro-1H,5H-pyrido[3,2,1-ij]quinolin-9-yl)methylene)cyclopentan-1-one and methylene blue. By using the technical scheme, the full-color photopolymer with high red, blue and green light diffraction efficiency and high refractive index modulation degree can be obtained.

The invention relates to an optical measuring device for determining object information of objects in at least one monitored area, having at least one receiving device for receiving optical signals from at least one object. The at least one receiving device comprises at least one electro-optical receiver (34) for converting the optical signals into electrical signals. In the receiver light path of the at least one receiving device, in front of the at least one receiver (34), there is at least one light-diffraction element (52). The at least one receiver (34) has a plurality of receiving areas (40) which are arranged one after the other when viewed in the direction of the at least one receiver axis (42) and can be evaluated individually depending on the optical intensity received in each case. At least one boundary edge (54) of the at least one light-diffraction element (52), when viewed projected onto the at least one receiver (34), extends at least in some sections not perpendicularly to the at least one receiver axis (42).