68 results about "Multiple focus" patented technology

This application is directed to media content compensation at an electronic device having a head-mounted display. The electronic device determines a multifocal eyewear prescription of a user associated with the electronic device. The multifocal eyewear prescription includes a multifocal parameter for a lens having a plurality of focal lengths. The electronic device obtains input media content, converts the input media content to corrective media content based on the multifocal eyewear prescription of the user, and renders, on the HMD, the corrective media content. In some embodiments, the lens includes a plurality of segments corresponding to the plurality of focal lengths. Each image frame of the input media content is divided into a plurality of regions based on the plurality of segments. The electronic device compensates the plurality of regions of the input media content based on the plurality of focal lengths to generate the corrective media content.

The invention belongs to the technical field of micro-nano optics. The invention provides a multi-focus off-axis super lens of a visible light wave band. The multi-focus off-axis super lens comprises a plurality of groups of off-axis single-focus sub super lens assemblies which are circularly arranged, wherein each group of off-axis single-focus sub super lens assemblies comprises a plurality of off-axis single-focus sub super lenses which are concentrically and annularly distributed; wherein the off-axis single-focus sub-super-lens comprises a micro-structure unit and a substrate unit, the micro-structure unit comprises a plurality of micro-structure columns which are uniformly arranged, and one end of each micro-structure column is arranged on the substrate unit. According to the embodiment of the invention, on the basis of a geometric phase modulation principle, through reasonable phase design and microstructure arrangement, the off-axis single-focus sub-super-lens has a designed focus position; through spatial multiplexing of the micro-structures of the multiple off-axis single-focus sub-super-lenses, one super-lens has the phase characteristics of the multiple off-axis single-focus sub-super-lenses, and the functions of the multiple off-axis single-focus sub-super-lenses are achieved on one super-lens.

The invention discloses a dew-point meter measurement data processing method and equipment, relates to the technical field of industrial automatic measurement and control and fault diagnosis, and aims to construct a dynamic sensing window with a variable form to preprocess dew-point meter time sequence data, calculate fault probability entropy in real time and detect instantaneous abnormality. And a window form is decided in combination with the fault-window form mapping library, and adaptive switching is carried out to obtain an anomaly recognition result. And selecting a corresponding algorithm from the correction strategy library to correct the abnormity. According to the method, a dynamic sensing window with a variable form is constructed, and adaptive switching among panoramic, sniping and multi-focus forms is realized by taking the fault probability entropy calculated in real time as a drive. By means of a built-in fault-window form mapping library, abnormal symptoms and fault physical mechanisms are associated, multiple concurrent faults are separated, root causes are deduced, and decision space explosion is avoided. And on the basis of a diagnosis result, a correction strategy library targeted algorithm is called to correct abnormity, and an identification-diagnosis-correction intelligent closed loop is formed.

This invention discloses a method and device for processing dew point meter measurement data, relating to the fields of industrial automation measurement and control and fault diagnosis technology. It constructs a dynamically sensing window with variable shape to preprocess time-series data from the dew point meter, calculates fault probability entropy in real time, detects instantaneous anomalies, and combines a fault-window shape mapping library to determine the window shape and adaptively switch it to obtain anomaly identification results. A corresponding algorithm is selected from a correction strategy library to correct the anomaly. This invention constructs a dynamically sensing window with variable shape, driven by real-time calculated fault probability entropy, enabling adaptive switching between panoramic, sniper, and multi-focus shapes. Utilizing a built-in fault-window shape mapping library, it associates anomaly symptoms with fault physical mechanisms, separates multiple concurrent faults, infers root causes, and avoids decision space explosion. Based on the diagnostic results, it calls targeted algorithms from the correction strategy library to correct anomalies, forming an intelligent closed loop of identification-diagnosis-correction.

An intelligent multifocal lens includes an optical zone. The optical zone includes a near vision zone, a transition vision zone, and a far vision zone surrounding the near vision zone and the transition vision zone. An add power of the near vision zone has a negative correlation with a radius of the near vision zone. A reduction of the power of the transition zone is in a range of 0.1 D to 0.6 D. The near vision zone and the transition vision zone have an interface therebetween, and a power of the near vision zone and a power of the transition vision zone at the interface therebetween are the same. The transition vision zone and the far vision zone have an interface therebetween, and a power of the transition vision zone and a power of the far vision zone at the interface therebetween are the same.

Embodiments of the present application provide a kind of multi-focus laser assembly, laser processing device and method.Multi-focus laser assembly includes laser, beam splitting element, beam angle adjustment assembly, first beam shaping assembly, beam converging assembly and objective lens arranged in order along the direction of light path, laser is used to emit laser beam;Beam splitting element is used to split laser beam into predetermined number of sub-beams;Beam angle adjustment assembly includes predetermined number of sub-adjustment unit, each sub-adjustment unit is used to adjust the transmission angle of corresponding sub-beam;First beam shaping assembly includes predetermined number of sub-beam shaping element, each sub-beam shaping element is used to shape the sub-beam adjusted by corresponding sub-adjustment unit;Beam converging assembly is used to converge all sub-beams with preset optical parameters on objective lens, so that all sub-beams form burst point at predetermined number of positions of object after focusing through objective lens.This scheme has relatively high cutting efficiency.

The invention discloses a multi-focus composite Fresnel phase diagram rapid generation and power equalization method and system for one-to-many free space laser communication. According to the method, aiming at a scene in which a plurality of user targets are located at different directional angles and different propagation distances, a focusing + directional single-beam phase is constructed for each target on the basis of analyzing a Fresnel zone lens phase and a linear tilt phase, and the phase is taken after complex field superposition is performed according to a preset power weight, so that the target target is obtained. A composite phase diagram for a phase-type spatial light modulator (SLM) is directly obtained. The power weight is preset according to a link budget or a task demand so as to realize on-demand distribution and equalization of multi-beam output power; and meanwhile, fixed phase bias can be introduced to each beam to suppress inter-beam interference fringes. According to the method, frame-by-frame iterative solution is not needed, the calculation complexity is low, and high-frame-rate and low-delay online updating is easy to realize.

The application discloses a plane scanning ultrasonic phased array and relates to the technical field of ultrasonic phased array nondestructive testing. The application utilizes two linear array probes with perpendicular or large included angle array directions to perform cross scanning detection, forms multiple focus lines parallel to the probe plane and perpendicular to the array direction through focusing and deflection, wherein the transmitting probe generates a transmitting focus line, the receiving probe adjusts the focusing rule to generate a receiving focus line, the intersection of the transmitting focus line and the receiving focus line is the detection focus point, the intersection of the transmitting focus line group and the receiving focus line group forms a focus point array, thereby realizing full-area scanning of the detection plane. In the plane scanning process, only two linear array probes are needed to realize plane scanning, so that the cost is greatly reduced. Through active focusing at the transmitting end, post-focusing at the receiving end and cross scanning in the mode of non-point-by-point focusing, the detection plane can be quickly covered, so that the detection efficiency is improved while the cost is reduced.

The invention discloses a focus image recognition method and system based on a deep learning model, and relates to the technical field of medical equipment. Comprising the following steps: acquiring medical images of various lesion types, and preprocessing the medical images to generate sample images; marking a focus area, extracting image feature parameters, and constructing a sample training data set; and based on the data set, training a segmentation identification model, preprocessing a medical image to be identified, identifying and segmenting a focus area by using the trained segmentation identification model, inputting a feature extraction model to obtain an image feature parameter prediction value, and calculating a biochemical discrimination influence index in combination with biochemical index data of a patient. And generating a comprehensive lesion identification coefficient according to the lesion texture complexity index, the edge influence index and the biochemical discrimination influence index, and comparing the comprehensive lesion identification coefficient with a set threshold to complete lesion image identification. And the accuracy and reliability of focus identification are improved.

To provide a focus detection device capable of selecting a defocus amount of a subject by using defocus amounts in focus detection directions different from each other.SOLUTION: A focus detection unit configured to perform first focus detection using a signal from a first focus detection pixel group in an image sensor including a plurality of focus detection pixel groups configured to receive light beams passing through different pupil regions of an imaging optical system, and second focus detection using a signal from a second focus detection pixel group having a pupil division direction different from that of the first focus detection pixel group; And a selection unit configured to select the first defocus amount of the object based on a result of using the defocus amounts acquired by the first and second focus detections in the selection area.SELECTED DRAWING: Figure 1

This invention relates to the field of optical detection technology, specifically a multifocal parallel phase extraction and alignment system based on a spatial light modulator, comprising: a wavefront modulation module, a parallel detection module, an information extraction module, a parameter calculation module, and a correction and execution module. The wavefront modulation module loads a phase modulation pattern through a spatial light modulator, generating a complex wavefront containing multiple diffraction orders via the objective lens, forming multiple spatially separated detection focal spots on the sample surface. The parallel detection module receives the reflected light signals from each focal spot in parallel through an array detector. The information extraction module analyzes the signals and extracts the phase offset of each focal spot, constructing a mapping set between position and phase offset. The parameter calculation module calculates the tilt angle and field curvature distribution parameters based on this set. The correction and execution module generates a comprehensive correction signal to drive the objective lens or sample stage to perform multidimensional attitude adjustments. This system achieves multifocal parallel detection and synchronous parameter calculation, improving alignment efficiency and accuracy.

The invention relates to a cylindrical battery positive and negative collector plate detection method, device and equipment and a medium, and the method comprises the steps: grabbing a collector plate, and adjusting the collector plate to a horizontal state; the collector plates in the horizontal state are conveyed along a preset detection path, and the collector plates are sequentially positioned to a plurality of detection stations; in at least one detection station provided with a liquid lens, driving a rotating jig to perform indexing rotation on a borne collector plate, and acquiring a multi-focus image sequence of a specific area of the collector plate through the liquid lens at a plurality of rotation angles; according to the multi-focus image sequence and detection data obtained at the multiple detection stations, the defects of the current collecting disc are recognized, the qualification of the current collecting disc is comprehensively judged, and sorting, discharging and disc arranging operation is executed according to the judgment result. The purpose of high-speed, high-precision and full-coverage automatic detection of dimensional deviation, appearance flaws and micron-sized burr defects of the cylindrical battery collector plate is achieved.

A method for multifocal energy gradient laser holographic cutting of hard and brittle materials includes the following steps: S1, determining the parameters of the incident beam and the high numerical aperture focusing objective; S2, determining the three-dimensional multifocal beam and parameters of the target hard and brittle material; S3, setting a two-dimensional linear phase distribution on the spatial light modulator plane as the initial phase for subsequent iterative calculations; S4, establishing a forward-backward propagation iterative loop based on phase optimization to calculate the multifocal holographic phase distribution; S5, superimposing a linear blazed grating phase on the multifocal holographic phase distribution, and generating a composite diffraction phase hologram using MATLAB code and inputting it into the spatial light modulator; achieving uniform holographic cutting with consistent actual absorbed energy in each layer. This invention features controllable three-dimensional focal positions, adjustable energy gradients along the depth direction at each focal point, strong deep-layer energy compensation capability, simultaneous aberration correction, and high consistency in cutting at different depths.

The invention discloses a variable multi-focus laser stealth cutting light path, device and method. The variable multi-focus laser stealth cutting light path comprises a laser, a beam splitting and combining module, a focus macroscopic adjusting module, a focusing objective lens and a machining platform which are sequentially arranged along the light path. The beam splitting and combining module splits incident laser into at least two sub light beams, and focusing lenses with different focal lengths are selectively arranged in the sub light beams; the focus macroscopic adjustment module comprises a lens driven by a voice coil motor and rapidly changes the characteristics of a light beam before the light beam enters a focusing objective lens. And the focusing objective lens is arranged on the piezoelectric displacement table for micron-sized precise focusing. Large-range and rapid coarse adjustment of the focus position is achieved through the voice coil motor, micron-order fine adjustment and real-time compensation of the focus position are achieved through the piezoelectric displacement table, and a single focus, static multiple focuses and dynamic scanning multiple focuses are flexibly generated by configuring different lenses in a beam splitting light path. And the processing efficiency of laser stealth cutting, the uniformity of a modified layer and the adaptability to different materials and thicknesses are remarkably improved.

The present disclosure relates to a multi-focal head-up display (MHUD) system and method to solve a visual fatigue problem generated in a vehicle head-up display and implement an augmented reality (AR) function. The present disclosure provides a multi-focal augmented reality head-up display (MHUD) system including an image projector which generates and emits a plurality of beams, an optical device which guides the plurality of beams emitted from the image projector to individual paths, a polarization control device which controls polarization states of the plurality of beams incident from the optical device, and a plurality of holographic optical elements (HOEs) which receives the plurality of beams emitted from the polarization control device to project a virtual image plane at different focal distances.

The embodiment of the invention discloses an anomaly detection method and device, electronic equipment and a computer readable storage medium, and relates to the technical field of image processing. The method comprises the following steps: acquiring an original image of a target space at an infinite focusing distance, and performing instance segmentation on the original image to obtain an original instance segmentation result; obtaining a reference instance segmentation result; the reference instance segmentation result is a result obtained by performing instance segmentation on a reference image, and the reference image is an image of a target space without abnormality; comparing the original instance segmentation result with the reference instance segmentation result, and determining whether abnormity exists or not; when abnormity exists, images of the target space are collected at multiple focusing distances, and abnormal images corresponding to the multiple focusing distances are obtained; and determining whether there is an abnormality in the target space based on the abnormal images corresponding to the plurality of focusing distances. According to the scheme, low-cost and accurate identification of the abnormal target can be realized.

The application relates to a multi-focal plane imaging defect detection method and a defect detection system. The defect detection method comprises the following steps: a first polarized light path and a second polarized light path are respectively irradiated to different regions of a beam splitter to obtain a plurality of sub-beams; the plurality of sub-beams are respectively focused on different axial depths of a wafer; reflected light is collected to form a plurality of detection lights which do not overlap with each other; the plurality of detection lights are respectively irradiated to different photosensitive areas of a detector, so that images of different focal planes are simultaneously imaged on different spatial positions of the detector to obtain focal plane images corresponding to the different focal planes; the plurality of focal plane images are geometrically corrected and pixel-aligned, and are stacked along an axial direction to form a data body, and three-dimensional spatial coordinates (xc, yc, zc) of defects are obtained through connected domain analysis. The defect detection system comprises an illumination module, a polarization module, a beam splitter, a micromirror array and a detector which are sequentially arranged along a light path. The application can determine the positions of defects.

A radiation system for controlling pulses of radiation comprising an optical element configured to interact with the pulses of radiation to control a characteristic of the pulses of radiation, an actuator configured to actuate the optical element according to a control signal received from a controller, the control signal at least partially depending on a reference pulse repetition rate of the radiation system and, a processor configured to receive pulse information from the controller and use the pulse information to determine an adjustment to the control signal. The radiation system may be used to improve an accuracy of a lithographic apparatus operating in a multi-focal imaging mode.

An ultrasonic transducer is provided, which includes a first transducer and a second transducer. The first transducer includes several first array units arranged along a first direction to form a first array. The first direction is a direction of a long axis of the ultrasonic transducer. The second transducer includes several second array units arranged along the first direction to form a second array. The second array and the first array are interleaved and separated from each other. One of the second array units is sandwiched between adjacent two of the first array units. The first transducer and the second transducer have a common reference coordinate and have a function of a multi-focus lenses along the second direction. The second direction is a direction of a short axis of the ultrasonic transducer, which is substantially perpendicular to the first direction.

The invention discloses a preparation method of a Nano-QLED device based on two-photon photoetching, the Nano-QLED device comprises a quantum dot light-emitting layer, and the preparation method of the quantum dot light-emitting layer is characterized by comprising the following steps: dividing a femtosecond laser beam into a plurality of sub-beams by adopting a multi-focus parallel two-photon photoetching method, the plurality of sub-beams act on the carrier transport layer to form a nanoscale patterned insulation structure, and the material of the insulation structure has a two-photon response characteristic; and filling nanoscale light-emitting quantum dots in the gaps of the insulating structure to form the quantum dot light-emitting layer. The preparation method can meet the large-area and high-precision processing requirements.

The application relates to the technical field of Fresnel acoustic lens application, and provides a composite Fresnel acoustic lens, a design method and related equipment. The composite Fresnel acoustic lens comprises at least two groups of coaxial multi-focus Fresnel zone plates, the at least two groups of coaxial multi-focus Fresnel zone plates are stacked after being radially translated by a set distance, at least three non-coaxial ultrasonic focal points are generated in a three-dimensional space, and the composite Fresnel acoustic lens can be used for transcranial ultrasonic stimulation or treatment; wherein the coaxial multi-focus Fresnel zone plate comprises a multi-layer lens structure which is nested together, and the multi-layer lens structure comprises a frame area and an ultrasonic transmission medium area. The method of stacking multiple groups of coaxial multi-focus Fresnel zone plates is used to simultaneously focus multiple different-axis and different-depth ultrasonic target points, and the limitation of a limited coverage range of a traditional single-focus or coaxial double-focus is overcome.

A multifocal X-ray tube, a multifocal X-ray source, and a human body tomography device are provided. The multifocal X-ray tube includes a housing, a window, and multiple anodes. Multiple spaced-apart exit windows are provided on the front wall of the housing. The window covers the multiple exit windows to seal the housing. The anodes are located inside the housing and have multiple target point groups corresponding one-to-one with the multiple exit windows. Each target point group includes multiple target points, each target point receiving bombardment from a corresponding electron beam drawn from the cathode and generating an X-ray beam. The distance between two adjacent target points in each target point group is smaller than the distance between two adjacent target groups. The multiple X-ray beams generated by the multiple target points in each target point group are led out of the X-ray tube through the exit windows corresponding to the exit windows, and the radiation fields of all X-ray beams approximately overlap on a common plane outside the X-ray tube.

The invention relates to a substrate and a processing method and system thereof, computer equipment, a computer readable storage medium and a computer program product. The method is applied to a substrate processing system, the substrate processing system comprises an optical multi-focus generator, a focus lens and a processing platform, the processing platform is used for placing a to-be-processed substrate, and the transparency of the to-be-processed substrate is greater than a preset transparency threshold; the method comprises the steps that a light beam emitted by a laser is received through an optical multi-focus generator, the light beam is separated at different diffraction orders based on a preset focus slope, and the focus slope is used for adjusting the vertical axial position of a focusing light spot; according to the method, light beams of different diffraction orders are converged through a focusing lens based on a preset focusing lens focal length, focusing light spots are formed on a focusing processing area of a to-be-processed substrate, the focusing light spots are used for processing the to-be-processed substrate, and the focusing lens focal length is used for adjusting the axial position of the focusing light spots. By adopting the method, the processing yield can be improved.

The invention relates to the technical field of thermal therapy, in particular to an MRI imaging-based ultrasonic-assisted thermal therapy system, which is characterized in that the MRI imaging-based ultrasonic-assisted thermal therapy system comprises an MRI imaging module, a heat source module, an ultrasonic monitoring module and a control module, and the control module comprises a data fusion processing unit, a closed-loop power control unit and a mechanical arm trajectory planning unit; by means of multi-source fusion of MRI temperature mapping, ultrasonic real-time imaging and optical fiber temperature sensing, low-delay and high-precision tissue temperature and state monitoring is achieved, prediction-correction closed-loop control based on the Pennes equation is combined, the temperature control precision and the response speed are improved, a multi-focus and track type combined heating strategy is supported, the treatment time is greatly shortened, and the treatment effect is improved. According to the invention, the MRI compatible mechanical arm and the wearable fixing device are matched, high repeated positioning and flexible probe pose optimization are realized, the stability and safety of the treatment process are ensured through a multi-stage safety interlocking and redundancy monitoring mechanism, and efficiency, accuracy and clinical applicability are considered in thermal ablation treatment.

Disclosed are a multifocal point-ring spot generation system and a laser welding method in the technical field of laser processing. The system includes an annular light source, a first collimating lens, an annular beam generation module, and a first reflector arranged sequentially at intervals along a first straight-line direction, and a point light source, a second collimating lens, a first focusing lens, a multi-curvature hollow reflector, and a second focusing lens arranged sequentially at intervals along a second straight-line direction, where the multi-curvature hollow reflector and the second focusing lens are each provided with a through hole at their centers for allowing a beam emitted by the point light source to pass therethrough, and the multi-curvature hollow reflector has an adjustable mirror surface curvature. The system can solve the technical problems of high processing cost and poor stability in deep welding caused by structural constraints of point-ring lasers in the prior art.

The application discloses a dynamic resolution ultrasonic phased array haptic generation device and a control method, relates to the technical field of ultrasonic haptic feedback, and realizes the software adjustment of the ultrasonic haptic focus size through an EDM beam forming algorithm, thereby breaking through the limitation of the traditional DAS method which is limited by hardware. Users can dynamically select a high resolution mode or a high radiation force mode according to specific application scenarios, and the flexibility and reality of haptic interaction are significantly improved. The system structure is compact, all adjustments are completed through software, hardware does not need to be changed, and the system is convenient to integrate into intelligent automobile central control, AR / VR headgear, interactive exhibition stands and other equipment, so that more rich and adaptive haptic experiences are provided for human-computer interaction. Under the premise of not changing the hardware structure, the system optimizes the phases and amplitudes of all channels of the ultrasonic array through the software algorithm of the upper computer, and cooperates with the hardware logic control of the FPGA controller to realize the dynamic control of the spatial resolution of the haptic focus and the generation of multiple foci.

Indirect vision system VIS comprises mirrors and / or cameras and a mixed-function multi-focal multi-functional DS light signal device having the reflector 50 and its associated source hidden under an opaque cover Hi capable of developing an illuminating surface 3 with a line design or luminous perimeter figures, associate and combine within the light perimeter, under the Hi cover, in the H casing or in the structure, other devices and functional subassemblies. With aerodynamic profile associated with protecting and improving the perception of light signal.

The application discloses a kind of based on diffraction's light field imaging method and system, comprising: set up including having axial chromatic aberration lens, diffraction grating and image sensor's imaging device;Using imaging device to the point light source on optical axis imaging, move point light source adjustment its distance to have axial chromatic aberration lens let the imaging result of point light source have minimum dispersion circle on image sensor plane, capture the focused imaging image of point light source and calibration obtain the distance of diffraction grating to image sensor;According to the distance of diffraction grating to image sensor and the diffraction efficiency of diffraction grating obtained, the optical coding response of each wavelength corresponding focusing plane image is calculated;Using imaging device to the scene meeting the condition under multi-wavelength environment imaging, the data of image sensor and optical coding response are substituted into optimization model calculation reconstruction to obtain all focusing plane images;The application can realize the single exposure acquisition of multiple focusing plane light field, complete dynamic scene light field acquisition.

The invention relates to the technical field of electromagnetic metasurfaces and near-field electromagnetic imaging, in particular to a holographic tensor impedance metasurface design method for near-field multi-point focusing, which comprises the following steps of: calculating equivalent scalar impedance under periodic boundary and eigenmode solution through full-wave simulation, establishing an equivalent relationship, and establishing a'geometric parameter-impedance tensor 'database; arranging a monopole at the center of the array plane to generate a reference field, and performing normalized linear weighting on a multi-focus expected field according to a surface impedance space change period to obtain a synthetic radiation field; and combining the synthesized radiation field and the reference field to solve a target impedance tensor and an anisotropic main direction, determining unit geometric parameters according to a library to generate a layout, and realizing near-field multi-point focusing at a preset position.

The application provides a thermal imaging lens temperature focusing compensation method and system based on mathematical modeling, comprising: obtaining multiple focusing curves of the same type of basic thermal imaging lens at different temperatures; respectively establishing a first mathematical model of a wide-angle end linear segment changing with temperature, a second mathematical model of a telephoto end linear segment changing with temperature, and a third mathematical model of a nonlinear inflection point segment changing with temperature; combining the first mathematical model, the second mathematical model and the third mathematical model to form a general mathematical model for describing the focusing curve at any temperature; obtaining partial focusing curve data of a target lens at at least one reference temperature, fitting individual difference parameters of the target lens by using the general mathematical model, so as to determine the complete focusing curve of the target lens in the full temperature range; and outputting the corresponding focusing motor driving position according to the complete focusing curve. The application can solve the problem of long time consumption of individual calibration of each lens in the full temperature range in the prior art.