785 results about "Focal position" patented technology

The invention provides a three-dimensional automatic focusing method and device based on multi-modal data fusion and Kalman filtering and a readable storage medium, and high-precision real-time focusing is realized through multiple steps: collecting sample three-dimensional phase information and different focal plane image data by using a phase and image sensor, and calculating phase depth and definition; constructing a multi-plane Kalman filtering cluster, modeling the focus state of each focal plane, and predicting the focus by fusing the neighborhood coupling influence; the focus state is updated and corrected in combination with the image definition and the phase gradient, and the optimal three-dimensional focus position is determined by means of a collaborative optimization decision maker; dynamically adjusting the noise matrix and the coupling coefficient, and controlling the objective lens to complete focusing. According to the method, through multi-modal fusion and multi-plane cooperation, the problems of focus drifting and jumping are effectively solved, the focusing precision and stability of an imaging system in a complex sample and a dynamic environment are remarkably improved, and the method is suitable for equipment such as a biomedical full-automatic microscope and a digital pathological section scanner.

The invention discloses a reflection-transmission mixed extreme ultraviolet collimation illumination system, and relates to the technical field of extreme ultraviolet optics. The system comprises a discharge plasma EUV light source, a multilayer film ellipsoid reflector and a collimating super lens. Wherein the discharge plasma EUV light source is used for generating radiation light in an extreme ultraviolet band; the multi-layer film ellipsoid reflector adopts an ellipsoid design, is plated with a high-reflectivity multi-layer film, is arranged on a transmission line of the discharge plasma EUV light source, and is used for focusing light beams of the light source; and the collimating super lens is arranged behind the focal position of the multi-layer film ellipsoid reflector and is used for collimating the focused light beams to form parallel light beams for Talbot photoetching illumination. The extreme ultraviolet illumination system is compact in structure, high in light beam energy and high in collimation, and the exposure quality in an application scene needing high-collimation extreme ultraviolet light beams is effectively improved.

The invention provides a laser positioning method for improving gemstone cutting precision, and belongs to the technical field of gemstone cutting laser positioning. A gemstone crystal refractive index tensor model and a ray tracing algorithm are established to simulate a propagation path of light in a gemstone; a thermo-optic effect prediction model is adopted to predict a focus drift distance according to temperature distribution and laser power data and calculate wavefront predistortion phase distribution for compensation, and a zero-vibration input shaping filter is designed for a galvanometer scanning system to suppress residual vibration. A composite control strategy that feedforward control compensates inertia lag and feedback control corrects position errors is adopted to drive a galvanometer, the inherent frequency of a system is recognized through spectral analysis, and the scanning frequency is adjusted to avoid resonance. The technical problem that in the long-time machining process, due to the thermo-optic effect and vibration of a galvanometer scanning system, the laser focus point position generates accumulated drifting, and the cutting precision is reduced is solved.

The invention relates to the technical field of focus testing, and particularly discloses a laser cutting head zero focus testing method based on reflected light detection, which comprises the following steps: S1, acquiring an optical signal reflected by a processed plate in a cutting process; s2, adjusting the position of a focusing lens to enable a laser focus to move along the optical axis direction relative to the surface of the plate; s3, recording reflected light intensity values corresponding to different focus positions, obtaining a function relationship between the reflected light intensity and the focus positions, and drawing a light intensity-focus position relationship curve; s4, determining a corresponding focus position when the intensity of the reflected light reaches the maximum value as an optical zero focus position of the system; s5, automatically recording and storing an optical zero focus position; the reflected light detector arranged in the cutting head or the laser reads the intensity of the reflected light in the cutting process, the function relation between the focus position and the intensity of the reflected light can be established, and the focus position corresponding to the maximum value of the intensity of the reflected light is the most accurate optical zero focus position.

The invention relates to the technical field of X-ray tube control, and discloses a control method and device for a controllable flying focus X-ray tube, and the method comprises the steps: building an orthogonal electromagnetic deflection system based on an electron beam flight path of the X-ray tube, and the orthogonal electromagnetic deflection system comprises an X-direction electromagnetic coil and a Y-direction electromagnetic coil; creating a conversion relation for converting the target focus position function into an electromagnetic coil current value; executing nonlinear magnetic field response compensation to obtain high-speed switching control signals of the X-direction electromagnetic coil and the Y-direction electromagnetic coil; and performing focus trajectory prediction based on the high-speed switching control signal to obtain a focus motion trajectory formed by the electron beam on the target material, and performing thermal load distribution optimization on the focus motion trajectory to obtain a focus position control scheme for uniform distribution of the surface temperature of the target material. Accurate positioning control of the electron beam on the target material is achieved, and the X-ray imaging quality is improved.

The resolution-customizable micro spectrometer based on the transverse dispersion metasurface comprises a dispersion metasurface array structure and a focal plane pixel array, and the dispersion metasurface array structure comprises a plurality of dispersion metasurface sub-arrays which are distributed in an array mode and used for preliminary spectrum decoupling and directional convergence. The dispersion metasurface subarray comprises a plurality of dispersion metasurface units and all-dielectric substrates thereof, the dispersion metasurface units are nano-columns with four-fold symmetry, the nano-columns are periodically arranged, and the phase of transmission light is dynamically regulated and controlled according to the frequency omega of incident light. The focal position (x ', y') of the transmission light on the focal plane is in a linear mapping relation along with the change of the omega; the focal plane pixel array comprises a multi-element plane array composed of a plurality of pixels, and the multi-element plane array is in pixel-level registration with the dispersion metasurface sub-array. According to the invention, pixel-level precise condensation is realized, crosstalk is effectively inhibited, the detection precision is improved, and real snapshot spectral imaging is realized.

Method (50) for measuring a surface of a workpiece (12) with an optical sensor (14) of a measuring device (10), comprising the following steps: - Capturing (54) a plurality of images of the surface of the workpiece (12) using the optical sensor (14), wherein each image represents a region of the surface of the workpiece (12), wherein each image is assigned a defined 6-DOF pose of the optical sensor (14) relative to the workpiece (12) and a defined focal plane position of the optical sensor (14), and wherein the captured images form an image stack; - Determining (62) a sharpness value of each pixel of each image of the image stack in order to generate a sharpness map for each image of the image stack, wherein the sharpness maps of the images form a sharpness map stack; - Transforming (64) the focus maps of the focus map stack into a defined reference system based on the respective associated 6-DOF pose and focal plane position of the optical sensor (14) to generate a focus cloud; and - Generating (66) a surface profile of the workpiece (12) based on the sharpness cloud, in particular based on local sharpness maxima of the sharpness cloud, wherein the method (50) further comprises the following step: - Moving (56) the optical sensor (14) and the workpiece (12) relative to each other during the sensing step (54) to change the 6-DOF pose of the optical sensor (14) in space relative to the workpiece (12), wherein in the moving step (56) the optical sensor (14) is moved rotationally, in particular tilted and / or rotated.

The illumination system comprises a light source and a digital micro-mirror device used for generating different phase modulation images, an aberration-eliminating combined lens is arranged between the digital micro-mirror device and a microscope main body, the digital micro-mirror device is arranged at the front focus position of the aberration-eliminating combined lens, and the digital micro-mirror device is arranged at the front focus position of the aberration-eliminating combined lens. The rear focus of the aberration-eliminating combined lens coincides with the focus of the objective lens of the microscope main body in the direction of the digital micro-mirror device, the aberration-eliminating combined lens comprises an aberration-eliminating lens group, the focal length f of the aberration-eliminating lens group is 45-70mm, f and the diagonal length X of the digital micro-mirror device meet the following relation: X is greater than or equal to 0.125 * f, the digital micro-mirror device has the advantages that a larger area can be imaged during single imaging while the digital micro-mirror device is used for stably switching modulation images with different phases, and more accurate analysis and measurement are facilitated.

The invention discloses a high-quality laser welding manufacturing device and a high-quality laser welding manufacturing method, which solve the problems of concentrated energy distribution, small inherent focal depth, insufficient depth-diameter ratio of welding and insufficient welding thickness of the existing ultrafast laser welding technology. The zoom collimation system, the cone mirror, the acousto-optic modulation unit and the long focal depth compression unit are sequentially arranged on a light path where the welding laser is located in the emergent direction of the welding laser. The zoom collimation system is used for changing the spot diameter of the welding laser and collimating the spot diameter; the cone mirror is used for shaping the welding laser subjected to diameter-variable collimation into long-focal-depth laser; the acousto-optic modulation unit divides the long-focal-depth laser into N sub-beams and adjusts the spatial position of each sub-beam, and N is a positive integer greater than or equal to 1; and the long focal depth compression unit is used for adjusting the spot diameter and focal depth length of each sub-beam, so that the focal position and energy of each sub-beam are suitable for laser welding.

The invention discloses a wafer six-surface detection automatic focusing method comprising the following steps: correcting the crystal grain position through a feeding XYR platform, and obtaining a to-be-detected crystal grain image; according to a to-be-detected crystal grain image, edge points in the edge contour of the crystal grain are converted into geometric parameters by using a Hough transform algorithm, and a position compensation value of the crystal grain is calculated; determining an optimal focus position of a front / back detection station of the to-be-detected crystal grain according to the optical characteristics, the light deflection angle and the incident light intensity of the crystal grain, and adjusting the focus position of the focusing module; according to the position compensation value of the crystal grain, an electric sliding table is controlled to carry an optical camera to move in place and focus and image; and by comparing actual detection data with prediction results of the refraction deviation correction model and the crystal grain front / back focus adjustment model, the accuracy of the model is evaluated and optimized. According to the invention, the problems of position error, optical characteristic difference, refraction deviation and the like in the prior art are effectively solved, and efficient and accurate crystal grain detection is realized.

A communication module including a primary radiator for transmitting an electromagnetic flux, and an electromagnetic flux controlling member for controlling a travelling direction of the electromagnetic flux sent from the primary radiator. The electromagnetic flux controlling member includes an incidence surface and an emission surface. The incidence surface and the emission surface are configured such that the electromagnetic flux emitted is expanded than the electromagnetic flux transmitted from a focal position of a reference lens optimized to collimate the electromagnetic flux from the primary radiator and emitted after incidence on the reference lens on a basis of an emission angle of the electromagnetic flux emitted from the primary radiator, a dielectric constant of the electromagnetic flux controlling member, and an arbitrarily set focal length of the electromagnetic flux controlling member.

The invention relates to the technical field of computer vision, and discloses a Monte Carlo tree search-based camera lens assembly focusing calibration algorithm and system, and the algorithm comprises the steps: constructing a three-dimensional search space comprising a focus position, a horizontal inclination angle and a vertical inclination angle, and combining a high-contrast cross wire test pattern to generate a local definition matrix; calculating an initial inclination angle based on the matrix to construct a root node of the Monte Carlo tree; according to the algorithm, an optimal search path is dynamically selected by applying an upper confidence bound strategy, child nodes are expanded in a three-dimensional space, physical adjustment is executed, and optimal three-dimensional configuration parameters are finally determined based on node scores through back propagation iterative optimization. The method breaks through a traditional one-dimensional search framework, effectively avoids a pseudo peak trap caused by inclination of a lens-sensor axis, improves the calibration precision and efficiency of the full-view-field definition of the camera, and achieves the precise positioning of a global optimal solution under a complex assembly tolerance.

An imaging device is provided. The imaging device includes an X-ray tube, a collimator, and a detector. The collimator includes an opening, wherein the collimator has a width in a first direction and a length in a second direction. The opening has an opening width in the width direction of the collimator, and an opening at at least one end of the collimator in the second direction has an opening width smaller than that of an opening within the middle section of the collimator.

The invention relates to the technical field of laser cutting, in particular to a laser beam centering adjusting method and device. According to the laser beam centering adjustment method provided by the invention, the light spot formed by the red light beam in the visual field of the camera can be automatically exposed, and the focus of the red light beam can be automatically focused to obtain the optimal focus position, so that the coordinate of the light spot center in the machine tool coordinate system can be obtained; according to the obtained coordinates, the cutting head is controlled to move so that the distance between the nozzle center and the coordinates of the light spot center and the nozzle center is smaller than a preset distance, and the purpose of laser beam centering adjustment is achieved. As the image of the light spot at the optimal focus is minimum and closest to the circle, the precision of fitting the circle is highest, the precision of the center position of the red light at the detection position is also highest, and the precision of centering adjustment of the laser beam is also improved.

The invention belongs to the field of nondestructive testing, and relates to a terahertz composite material nondestructive testing method which comprises the following steps: S1, pretreating a to-be-tested material sample; s2, judging whether the to-be-detected material sample responds to terahertz waves or not, and if not, ending; s3, measuring the thickness of the to-be-detected material sample; s4, carrying out terahertz spectrum testing on the to-be-detected material sample, and determining a delay line range; s5, setting a delay line step length; s6, setting an imaging scanning range; s7, setting an imaging scanning step length; s8, clamping the to-be-detected material sample; s9, determining the focus position of the terahertz wave; s10, enabling the center of the to-be-seen material sample to coincide with the focal point of the terahertz wave, and carrying out scanning imaging; s11, calculating the defect depth of the to-be-detected material sample; and S12, carrying out terahertz time domain slice contrast imaging.

The invention relates to the technical field of optical detection, and particularly provides a mirror surface detection method for a large-aperture spliced telescope, which comprises the following steps of: emitting light from a focus position by using a light source, reflecting the light through a mirror surface of the large-aperture spliced telescope to enter a discrete lens arranged at the rear end, and splitting the light by using a spectroscope to obtain a split light beam; the first light beam enters the camera to obtain interference fringes of the splicing seams, the second light beam enters the optical switch to carry out aperture coding, and the mirror surface precision of the large-aperture spliced telescope can be determined according to the code of each splicing seam and the confocal and co-phase information of the sub-reflectors on the two sides of the splicing seam. According to the invention, splicing seam detection is carried out through focus reverse auto-collimation, the problem that an oversized collimator is needed traditionally is avoided, point-by-point detection is carried out on the sub-reflectors according to the splicing seam, and confocal and co-phase detection of the adjacent sub-reflectors is realized according to interference fringes.

The present invention discloses a photoacoustic microscopy imaging system based on a high-speed focuser. The photoacoustic microscopy imaging system includes a light source component, a single-mode fiber coupling component, a high-speed focuser component, a light beam scanning component, a reflective bracket, a signal acquisition component and a computer. The present invention adopts a mobile focusing design. During the photoacoustic imaging point scanning process, the displacement of the double-cemented lens is controlled by the movement of a fast linear motor, and then the focal position of the light beam is adjusted, so that during the scanning process, the focal plane at any position always coincides with the imaging surface. The present invention establishes an imaging method for automatically adjusting the focal plane by adopting a high-speed focuser, which effectively improves the image signal-to-noise ratio and resolution, and is low in price and easy to operate. The present invention adjusts the imaging in real time according to the photoacoustic signal fed back during the scanning process, and can perform photoacoustic microscopy imaging of any unknown surface, which has broad research prospects and application value.

The utility model discloses a receiving end assembly of a high-speed optical module, which belongs to the technical field of optical devices and comprises a Receptacle optical interface, an optical fiber, a capillary tube, a lens, a wavelength division multiplexer, an array lens, a prism and a substrate, the optical fiber is used for transmitting light, the capillary tube, the lens, the wavelength division multiplexer, the array lens and the prism are fixed on the substrate, the Receptacle optical interface is connected with the optical fiber, and the optical fiber is connected with the substrate. The lens is located between the capillary tube and the wavelength division multiplexer, the array lens is located between the wavelength division multiplexer and the prism, the capillary tube converges light rays and enables the light rays to enter the lens, the lens enables collimated light converged by the capillary tube to enter the wavelength division multiplexer, the wavelength division multiplexer demultiplexes wavelengths, four paths of parallel light are formed and enter the array lens, and the array lens is located between the prism and the array lens. The array lens gathers incident light, and the gathered light beam is emitted from the prism and then gathers to the focus position. According to the invention, four light beams of 0.75 Pitch are converted into four light beams of 0.25 Pitch by using the turning prism; according to the invention, four light beams with the interval of 0.25 mm can be realized at the receiving end of the optical module.

An accessory detachably attached between an interchangeable lens and an imaging apparatus includes a communication unit for communicating with the interchangeable lens and the imaging apparatus, a first operation unit operated when focus position information on the interchangeable lens is to be acquired from the interchangeable lens, a memory unit storing information relating to focus of the interchangeable lens based on the focus position information, a second operation unit operated when reproduction driving is to be performed of a focus lens included in the interchangeable lens, and a control unit controlling driving of the focus lens. When the first operation unit is operated, the control unit acquires the information relating to focus by using the focus position information. When the second operation unit is operated, the control unit performs the reproduction driving of the focus lens by using the information relating to focus.

The invention discloses a light focusing and condensing device for a high-energy pulse incandescent light source, and relates to the field of air flow test, the light focusing device comprises a light focusing collimating lens and a light focusing converging lens, and the parameters of the light focusing collimating lens and the light focusing converging lens are the same so as to construct a conjugate light path structure I to adjust the converging angle; the light condensing device comprises a light condensing collimating mirror and a light condensing converging mirror, and the relative aperture of the light condensing collimating mirror is larger than the parameter of the light condensing converging mirror, so that a conjugate light path structure II is constructed to efficiently collect light beams to the focus position of the schlieren collimating mirror in the schlieren light path; the positions of the light focusing device and the light condensing device can be adjusted front and back in the direction of the optical axis. By designing the special focusing collimating mirror or focusing converging mirror matched with the high-energy pulse incandescent light source and adjusting the positions of the focusing device and the condensing device, the focusing converging angle can be adaptively adjusted as required, meanwhile, the position of a focusing converging point can be kept unchanged, and the use requirement is met.

The invention relates to a method, in particular a computer-implemented method, for laser machining planning and / or laser machining an object (1), in which: a laser beam (2) of a laser can be guided along at least one specified movement path (3) on the object (1) by means of a Galvo-scan system (4); a location-dependent idealised focus profile zsoll(s) (7) is determined which specifies a focal position (18) of a laser focus (5) of the laser beam (2) in a laser propagation direction (6) along the movement path (3); the location-dependent idealised focus profile zsoll(s) (7) is extended by a tolerance range (11); and, from the location-dependent idealised focus profile zsoll(s) (7), a location-dependent adjusted focus profile (8) is determined such that at least dynamic limits of a focus actuator (16) for setting the focal position of the laser focus (5) are adhered to, and that the location-dependent adjusted focus profile (8) lies at least partly within the tolerance range (11). The invention furthermore relates to a computer program, a computer-readable storage medium and a laser machining device (19).

The present invention discloses a laser head air path structure for improving cutting quality, comprising: a laser, a laser channel, a focusing mechanism, an air supply unit and a nozzle device; wherein, the laser channel is vertically arranged in the middle of the laser, the focusing mechanism is horizontally installed in the laser channel inside the laser, the nozzle device is vertically installed below the laser, and an independent first air channel and a second air channel are provided in the nozzle device, and the first air channel and the second air channel respectively spray protective gas to the laser cutting point from corresponding blowing points at the same time; an air supply unit is installed between the laser and the nozzle device, and the air supply unit is used to supply protective gas to the first air channel and the second air channel in the nozzle device; the spray direction of the first air channel is directly facing the cutting focus position of the laser; the spray direction of the second air channel is the peripheral position of the cutting focus circle of the laser.

The invention belongs to the field of multi-order diffraction lens processing, and particularly relates to a multi-order diffraction lens manufacturing error analysis method based on ring band reconstruction differential. The method comprises the following steps: firstly, constructing an error function epsilon for a morphology error type caused by processing of MDL; based on the constructed error function epsilon, an MDL error height distribution matrix hij is obtained; then calculating a diffraction light field of the MDL at a focal plane position; and finally, calculating optical performance indexes of the MDL under the influence of the error, wherein the optical performance indexes comprise relative focus position deviation and relative focusing efficiency loss. According to the method, optical performance related analysis can be effectively carried out on complex morphology errors formed in the MDL manufacturing process; the change trend and interval of the optical performance loss of the MDL under the influence of manufacturing errors can be accurately analyzed through theoretical calculation and analogue simulation; the method has high applicability and accuracy for optical performance analysis work of the MDL under any error morphology; the process is convenient to improve, and the practicability is high.

Provided is an imaging apparatus including a determination unit configured to perform scene determination and a combination unit configured to combine a plurality of images different in focus position in an optical axis direction. The combination unit automatically performs the combination based on a result of the scene determination. A composite image to be generated in a case where the combination unit performs the combination is deeper in depth of field than the plurality of images.

The invention discloses an automatic focusing method and system of a cell slide scanner, and relates to the related field of optical equipment focusing technology.The method comprises the steps that a slide is previewed and scanned, a multi-mode preview image and physical height sensing data are synchronously collected and preprocessed, and then the pre-processed image is obtained; the multi-modal preview image and the corresponding height data are input into a pre-training focus prediction model, a focusing strategy graph aligned with a slide coordinate space is output, and the graph comprises the predicted optimal focus offset, the focusing function recommendation identifier, the focus verification confidence coefficient and the search radius of each view point; according to the focusing strategy graph, a final focus is determined through feedforward positioning, limited verification and conditional adjustment, a scanner objective table is controlled to carry out formal scanning at the final focus position, and a complete scanning image of the cell slide is collected. The problems that a traditional focusing method is long in time consumption and poor in adaptability to complex samples with low contrast, high background fluorescence and scratch pollution are solved, and the adaptive capacity of the focusing process is improved.

According to one aspect of the present invention, a pattern inspection apparatus includes: an imaging sensor including a plurality of first detection elements that detect light flux transmitted through or reflected by a target object illuminated with inspection Light and capture a pattern image of the target object, and a plurality of second detection elements that are arranged adjacent to the plurality of first detection elements, detect Light fluxes obtained by shifting a focus position of the light flux front side and rear side, and capture images for focus adjustment; an adjustment mechanism configured to adjust a focal position of the light flux by using the images for the focus adjustment captured by the plurality of second detection elements; and a comparison circuit configured to compare the pattern image captured by the plurality of first detection elements and a predetermined reference image.

The invention discloses an auxiliary focusing method and device of shooting equipment, a holder and a focus following device. The method comprises the following steps: acquiring an image of a current scene and depth information of a shooting object in the image; based on the image and the depth information, constructing a stereoscopic view containing the shooting object, the stereoscopic view being displayed on the interactive interface, the stereoscopic view being provided with an identifier to reflect a focal plane of a focus position of the shooting device, the identifier moving in the stereoscopic view along with the focus following operation to assist a user in determining the focus position; wherein the stereoscopic view presents the shooting object in a three-dimensional mode. According to the method, the current focus position of the shooting equipment can be visually displayed, and sufficient convenience and reliability are provided for focusing of the shooting equipment.

The invention belongs to the technical field of additive manufacturing, and provides an SLM quality improving method and system based on dynamic focusing and light spot tracking. Comprising three core processes of real-time measurement, compensation calculation and dynamic focusing scanning, wherein height information of an actual working surface on a current scanning path relative to an ideal focal plane is measured in real time; the central processing and control unit calculates the real-time compensation amount of the laser focus; the three-dimensional dynamic focusing device adjusts the laser Z-axis focus position and is matched with the two-dimensional galvanometer to realize that a light spot is always focused on an actual working surface; according to the invention, the three-dimensional dynamic focusing device works cooperatively with the central processing and control unit and the distance measuring device to form a shape follow-up processing mechanism; a closed-loop control system effectively reduces forming defects through a ranging-control-focusing circulation mechanism; the adaptive adjustment capability of the system broadens the application boundary of the SLM technology.

The invention belongs to the field of laser application, and particularly relates to a Gaussian energy distribution-based laser beam focus positioning method, which comprises the following steps of: constructing a distribution model of laser power along an optical axis direction by using a shading baffle with a through hole, the size of which is slightly smaller than the diameter of a laser spot, and determining the focus of a laser beam by means of synchronously acquired experimental data; and the laser spot position is automatically determined. According to the method, the spot focus can be quickly and automatically positioned, and support is provided for determining the focus position in the application fields of laser processing, detection and the like.

The invention discloses a laser scribing device and a laser scribing method.The laser scribing device is used for conducting laser scribing on a substrate of a thin-film solar cell and comprises a movable scribing module and a control module, and the movable scribing module comprises a laser emitting unit, a reflector, a reflector driving unit and a range finder. And the reflecting mirror is used for reflecting the laser from the laser emitting unit and enabling the reflected laser to be vertically emitted to the processing surface of the substrate. The reflector driving unit is used for driving the reflector to move in the current scribing direction, and the focus position of the laser is adjusted by adjusting the position of the reflector in the current scribing direction. The range finder is used for measuring the distance of the current to-be-scribed position of the machined surface to obtain a distance value. And the control module is used for controlling the reflector driving unit to adjust the position of the reflector in the current scribing direction according to the distance value of the current to-be-scribed position. The structure for adjusting the laser focus is simple, and the cost of the scribing device can be reduced.