108 results about "Multiple focus" patented technology

The invention discloses a fiber bragg grating femtosecond laser direct writing system and method based on light field regulation and control. The system comprises a femtosecond laser source, a polarization control module, a light beam expanding module, a light field modulation module, a 4f filtering imaging module, an oil immersed objective lens, a precision positioning and optical fiber clamping module, an observation module and a computer control module. The method comprises the following steps: firstly, fixing a standard single-mode optical fiber to be processed on a three-dimensional precision displacement platform; then programmable wavefront modulation is carried out on the femtosecond laser through a light field modulation module, and a multi-focus array is generated; then focusing the multi-focus array into the fiber core through an oil-immersed objective lens to realize one-time parallel inscribing of a plurality of refractive index modulation RIM regions; and finally, the computer control module controls the three-dimensional precision displacement platform to move at a constant speed in the axial direction of the optical fiber, and parallel integrated inscribing of a plurality of FBG structures is completed. According to the invention, the inscribing precision and inscribing efficiency of fiber bragg grating femtosecond laser direct writing are improved.

A head-wearable extended reality (XR) device includes an optical assembly. The optical assembly has a display and an optical element. The display is provided to display virtual content to a user of the XR device. The optical element is provided to direct the virtual content from the display along an optical path to an eye of the user. The optical element includes a first portion and a second portion. The first portion provides a first focus distance that corresponds to a first viewing zone of the display. The second portion provides a second focus distance that differs from the first focus distance and corresponds to a second viewing zone of the display.

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 multi-wavelength same-viewing-direction laser radar telescope system, and belongs to the technical field of laser radar detection. The system comprises a paraboloid single primary mirror which focuses a specific wavelength optical signal received by a telescope to a focus through a primary mirror paraboloid; the replaceable small hole is fixedly formed in the focus position of the paraboloid single primary mirror; the collimating lens group is used for collimating the telescope focusing light beam penetrating through the replaceable small hole to form parallel light beams; the n dichroic mirror groups are used for dividing the parallel light beams into reflected parallel light beams and transmitted parallel light beams; and the plurality of focusing lens group assemblies are used for focusing the parallel light beams split by the dichroic mirror to the focal points of the focusing lens group assemblies, and the number of the plurality of focusing lens group assemblies is n + 1. Multi-wavelength receiving in the same direction can be achieved, light background noise is suppressed by the secondary diaphragm, view fields of different wavelengths are controlled respectively, the size is small, the light collecting efficiency is high, and noise is low.

A head-wearable extended reality (XR) device includes an optical assembly. The optical assembly has a display and an optical element. The display is provided to display virtual content to a user of the XR device. The optical element is provided to direct the virtual content from the display along an optical path to an eye of the user. The optical element includes a first portion and a second portion. The first portion provides a first focus distance that corresponds to a first viewing zone of the display. The second portion provides a second focus distance that differs from the first focus distance and corresponds to a second viewing zone of the display.

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.

The application provides a laser processing brittle material multi-focus cracking device, which comprises a laser, a beam expanding and collimating system, a diffraction element and a beam focusing system; the laser is used for emitting laser; the beam expanding and collimating system is arranged on a light path of laser transmission, and is used for expanding the laser emitted by the laser; the diffraction element is used for making the laser generate multiple diffraction orders; and the beam focusing system is used for focusing the laser, so that the laser forms multiple focuses in the longitudinal position of the brittle material. The application controls the focusing sequence of the focuses in the material by introducing a specific diffraction optical element and adding a high-frequency oscillation filter on the focusing light path, and multiple modified layers are formed in the longitudinal position of the material through one-time scanning of the laser, so that the cold cracking efficiency is greatly improved.

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.

The invention belongs to the technical field of light guide plate machining, and discloses a multi-focus rotary machining method and device for a large-size light guide plate, and the device comprises a machining cavity, and a laser, a high-speed optical switch, a spatial light modulator and a first reflector are installed above the machining cavity; the rotary table is rotationally installed in the machining cavity, a second reflecting mirror is rotationally installed at the center position of the rotary table, and a plurality of third reflecting mirrors which are arranged in the circumferential direction are further installed on the rotary table; a light guide plate to be processed is placed on the conveyor belt, and the conveyor belt is used for conveying the light guide plate to a processing position; and when the light guide plate is transmitted to a preset processing position and any third reflector rotates into a preset area above the light guide plate, a laser is started to process the light guide plate. By introducing the spatial light modulator, original single-focus laser processing is upgraded to multi-focus parallel processing, and the processing efficiency of the light guide plate lattice points is greatly improved.

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.

The utility model belongs to the technical field of car lamps, and particularly relates to an optical coupling structure and a car lamp, the optical coupling structure comprises a plurality of light sources and a reflecting mirror, the inner surface of the reflecting mirror comprises a plurality of coupling reflecting surfaces, the coupling reflecting surfaces are arranged in parallel, the generatrix of each coupling reflecting surface is an ellipse, and the ellipse is provided with a first focus and a second focus. Each first focus is provided with a light source, and the multiple second focuses are arranged in an overlapped mode. According to the utility model, the generatrix of each coupling reflection surface is the ellipse, the light source is arranged on the first focus by utilizing the characteristics of the ellipse, the second focuses of the plurality of generatrixes are overlapped, and the light emitted by each light source from the first focus is totally reflected by the coupling reflection surfaces and then is converged on the second focus, so that the light of the plurality of focuses is coupled into one focus; therefore, the defocusing problem is avoided, the light efficiency is reasonably and efficiently utilized, and the lighting is uniform and attractive.

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.

Systems, devices, and assemblies for implementing multi-focal lens portions in wearable heads-up displays are described. Multi-focal lens portions may include at least two regions having different optical power, and at least one transition region between regions having different optical power. If display light is directed through a transition region, aberrations or distortion may be visible in the display presented to the user. The present systems, devices, and assemblies address this issue through shaping, positioning, and orienting of regions of a multi-focal lens portion, through positioning, orientation, and aiming of display optics, and / or through arrangements of lens assemblies which prevent display light from travelling through a multi-focal lens portion.

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 belongs to the technical field of laser processing, and discloses a reflective beam shaping method insensitive to a light source and capable of generating multiple focuses and a shaping mirror, and the method comprises the steps: pre-dividing a reflecting surface of a reflective beam shaping mirror into a plurality of sub-reflecting surfaces; wherein after the light source enters each sub-reflecting surface, a plurality of target focuses are formed at preset positions of the working surface; constructing a mapping relation between each sub-reflecting surface and the target focus; and determining a surface type function of each sub-reflecting surface according to an initial surface type equation of the sub-reflecting surfaces and the mapping relation, and calculating an accurate analytical solution of boundaries of all adjacent sub-reflecting surfaces so as to ensure the continuity of the whole surface type. Multi-focus beam shaping can be achieved only through one reflecting mirror, optical elements are few, an integral form is adopted, the device is not sensitive to an incident light source and is not affected by light source fluctuation, more ideal and stable effects can be achieved, and the device can be widely applied to laser machining scenes such as laser cutting and laser welding.

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.

This invention discloses a multifocal particle detection system and method based on a metalens array, comprising an illumination module, an imaging module, an image acquisition module, an analysis and calculation module, and a microfluidic device. The illumination module includes a laser, a collimating lens, a beam expander, and a metalens array arranged sequentially along the beam propagation direction. First, a parallel beam is generated by the laser, collimating lens, and beam expander, covering the entire aperture of the metalens array. Then, a set of focal points is generated by the metalens array. The microfluidic device is placed between the illumination module and the imaging module to hold the solution sample containing the particles to be measured. The image acquisition module is located behind the focal plane of the metalens array. The analysis and calculation module is used to obtain the relevant physical quantities of the particles to be measured in the solution. This invention utilizes a metalens array to generate a focal point array within an extremely short working distance, simplifying the optical path and facilitating integration with microfluidic devices.

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.

Disclosed is an apparatus and method for use in a system in which light pulses of different wavelengths are generated by moving an optical element connected to an actuator and in which the actuator is driven by a command voltage having a threshold cap depending on a position of a pulse in a burst of pulses.