27 results about "Source plane" patented technology

This application discloses a fast and interpretable homography decomposition method, relating to the field of computer vision technology. The method includes: obtaining a first anchor point pair, a second anchor point pair, and two sets of auxiliary point pairs based on a source image and a target image; calculating a first similarity transformation matrix based on the first anchor point pair and a second similarity transformation matrix based on the second anchor point pair; the first similarity transformation maps the first anchor point pair to a standard anchor point, and the second similarity transformation maps the second anchor point pair to the standard anchor point; calculating the parameters of a kernel transformation matrix using the auxiliary point pairs on the source plane and the target plane; the kernel transformation matrix has the property of preserving the standard anchor points; and synthesizing a homography matrix from the source plane to the target plane based on the first similarity transformation matrix, the second similarity transformation matrix, and the kernel transformation matrix. This application aims to solve the problems of low computational efficiency, scene limitations, and lack of algebraic and geometric meaning in existing homography calculation methods.

The invention belongs to the technical field of optical thin film detection, and particularly discloses an optimization method of an optical thin film detection system, which is used for solving the problems of weak interference resistance, poor pollution resistance and insufficient complex scene adaptation of the traditional detection system. The method comprises the following steps: pre-selecting a light needle beam with a needle-point-shaped cross section as a light source, defining a source plane light field, and constructing a limited energy generation condition through apodization operation; setting a plurality of groups of regulation and control parameters for three transmission states of diffraction, non-diffraction and focusing; building an experiment system to generate a directional light needle light beam, simulating pollution and interference scenes, and collecting light field data of different transmission nodes before and after interference; and quantizing the light field similarity through a witness function, screening an optimal regulation and control parameter, and integrating the optimal regulation and control parameter to a detection system. According to the invention, the anti-interference and information stability are improved from the light source essence, the method is adaptive to ultrathin, multi-layer thin film and complex environment detection, the detection precision and long-term stability are obviously improved, and both practicability and economy are taken into account.

The invention discloses a station weighting-based micro-seismic event plane positioning confidence ellipse calculation method, which comprises the following steps of: screening P-wave arrival time data simultaneously received by a plurality of stations, and calculating an initial seismic source position coordinate and an arrival time residual error of each station; the arrival time equation is linearized, and a design matrix and an initial weight matrix are constructed; constructing a normal equation based on the design matrix and the station weight matrix, solving a parameter correction amount, and updating a seismic source position coordinate and a seismic moment; calculating a covariance matrix and extracting a sub-matrix, performing eigenvalue decomposition to obtain eigenvalues and eigenvectors, and calculating an ellipse area under a preset confidence level; respectively resetting the weight of each station to zero, recalculating the area of the confidence ellipse, constructing an influence index of the station on the area of the ellipse, and adjusting the weight of the station according to the influence to obtain an updated weight matrix; and judging a convergence state based on the relative change rate of the confidence ellipse area, and outputting a final seismic source plane position and confidence ellipse parameters during convergence. According to the invention, rapid and accurate positioning operation of a micro-seismic monitoring scene can be realized.

A laser vibration measuring instrument series reciprocating optical frequency modulation calibration method and device belong to the field of photoelectric measurement. The calibration device is mainly composed of a calibrated laser vibration measuring instrument, a first acousto-optic modulator, a second acousto-optic modulator, a lens, a first sinusoidal signal source, a second sinusoidal signal source, an FM signal source and a plane mirror. For the laser signal emitted by the laser vibration measuring instrument, the reversibility of the optical path is used, the "I" type optical path structure is used, the output frequency translation and modulation control of the laser vibration measuring instrument are realized by using the twice optical frequency modulation mode of the same group of optical devices combined with twice optical frequency translation, the laser Doppler effect caused by different vibration waveform values is simulated, the modulated laser is completely returned to the calibrated laser vibration measuring instrument along the original path, the change waveform of the frequency value is replaced by the change waveform of the vibration speed value, and the calibration of the laser vibration measuring instrument is realized. The present application has the advantages of portability, wide frequency range, wide amplitude range calibration, high precision and good stability.

The application discloses a method for generating a flat-top beam array, comprising the following steps: introducing a multi-Gaussian function and a hyperbolic function, superimposing the hyperbolic function, constructing a weight function and a kernel function with Gaussian distribution intensity based on the superimposed hyperbolic function and the multi-Gaussian function; introducing a partial coherent light construction formula, combining the weight function and the kernel function to obtain a cross-spectral density function of a multi-cosine multi-Gaussian correlation light field containing a multi-cosine function at a source plane; introducing a free space transmission formula, constructing an intensity expression of the multi-cosine multi-Gaussian correlation light field at an arbitrary transmission distance according to the cross-spectral density function of the multi-cosine multi-Gaussian correlation light field, that is, an expression of the multi-cosine multi-Gaussian correlation light field; adjusting the transmission distance and the parameters of the multi-cosine multi-Gaussian correlation light field to obtain a flat-top beam array with different numbers of rows and columns, and realizing an array form with adjustable flat-top sub-beams; and the application can effectively control the number of the flat-top beam array sub-beams.

The present application relates to an imaging system for radiographic examination. Disclosed is an imaging system for radiographic examination, comprising: a first radiation source assembly comprising a plurality of radiation sources; a second radiation source assembly comprising a plurality of radiation sources, target points of all the radiation sources of the first radiation source assembly being arranged in a first radiation source plane, and target points of all the radiation sources of the second radiation source assembly being arranged in a second radiation source plane; a plurality of first detector units arranged in a first detector plane; a plurality of second detector units arranged in a second detector plane; and a detector support, the plurality of first detector units and the plurality of second detector units being both mounted on the detector support, wherein the first radiation source plane, the second radiation source plane, the first detector plane and the second detector plane are sequentially distributed along a travel direction.

This application belongs to the field of light field display technology, specifically disclosing a rigorous scalar light field calculation and solution method and system. It includes: obtaining the complex amplitude distribution on the source plane; and calculating the rigorous scalar light field distribution on the observation plane based on rigorous scalar diffraction theory and the complex amplitude distribution on the source plane. Based on scalar diffraction theory, this application constructs a light field propagation model for arbitrary propagation distances, avoids approximation errors in geometric correction methods through a rigorous scalar light field propagation method, overcomes the propagation distance constraints of the scalable angular spectrum propagation model, and achieves Abbe diffraction-limited resolution through a phase retrieval algorithm.

The invention discloses a method and a system for calculating a fire envelope temperature field of a large-span space structure. The method comprises the following steps: reading fire scene parameters, a geometric position of a fire source area and a steel member node file; establishing a fire source plane polygon according to the geometric position of the fire source area, and calculating the horizontal projection distance and the vertical distance between each component node and the fire source and the distance between the center of the ignition source and the steel component; according to the fire scene parameters and the distance, an empirical formula library is called in parallel, and the smoke temperature time history of each steel member node is obtained; according to the smoke temperature time history, the flame geometric parameters and the component thermal parameters, the component temperature time history is iteratively calculated step by step; in all fire scenes, the highest temperature and the scene corresponding to the highest temperature are taken for each component node, and an envelope temperature field is generated; and outputting the temperature time history, the envelope temperature field and the scene extreme value to a storage medium. According to the method, the calculation precision, the calculation efficiency and the engineering operability are considered, and the overall fire-resistant safety evaluation requirement of the large-span space structure is met.

The invention discloses a method and equipment for simulating amplitude and phase distribution of any target scattered wave on a Cassegrain antenna and a medium. Establishing a coordinate system by taking the vertex of the reference paraboloid as an original point, generating an incident ray equation according to a target coordinate and a scattering angle, and solving an intersection point and a normal direction of the incident ray equation and a main reflecting surface; reflected light rays are obtained by using a reflection law, and intersection points of the reflected light rays and a feed source plane are solved; the amplitude attenuation of each beam of light reaching the feed source is calculated according to the inverse ratio of the square of the optical path, the phase is calculated according to the linear relation of the optical path, and a complex phasor is generated; superposing multiple beams of scattered light complex phasors of the same target to obtain feed source aperture surface synthesis amplitude phase distribution; and the antenna directional diagram can be quickly generated by traversing the polar angle through the fixed polar radius. The whole process is grid-free and iteration-free and is completed in milliseconds, the precision is consistent with the geometric optical limit, real-time calculation can be realized on common hardware, and the antenna design, test and calibration periods are remarkably shortened.

Disclosed is an illumination system for an interferometer, comprising: a system light source; the steering mirror assembly is used for receiving and reflecting the system light in at least two orthogonal directions; the tracking mechanism is used for tracking the angular orientation of the steering mirror assembly in the two orthogonal directions and providing an electronic signal representing the angular orientation; the focusing lens assembly is used for focusing the system light reflected away from the turning lens assembly to a focusing light spot on a two-dimensional plane corresponding to a source plane of the interferometer; and an electronic controller operably coupled to the steering mirror assembly and configured to cause the focused spot on the source plane to follow a predetermined motion trajectory.

An optical lens assembly includes, in order from a visual side to an image source side: a first group including a first lens group and an optical element, and the optical element including, in order from the visual side to the image source side: an absorptive polarizer, a reflective polarizer and a first phase retarder; a second group including, in order from the visual side to the image source side: a second lens group with positive refractive power and a partial-reflective-partial-transmissive element; and a third group including, in order from the visual side to the image source side: a second phase retarder and an image source plane. When the optical lens assembly satisfies certain conditions, the weight of the device can be reduced, the zooming function can be provided, and the image quality can be ensured.

The invention relates to the technical field of precision optical measurement, and discloses a double-frequency heterodyne three-axis grating ruler. The device mainly comprises a double-frequency orthogonal polarization light source, a plane mirror, a combined grating, a two-dimensional reflection grating, a one-dimensional grating, a polaroid, a quarter-wave plate, a half-wave plate, a heterodyne photoelectric conversion unit and a signal acquisition and processing device. The double-frequency light source generates S and P polarized light which are different in frequency and vertical in polarization, the S and P polarized light enters the combined grating partition through the plane mirror to be diffracted, and X, Y and Z three-axis displacement signals are synchronously acquired in cooperation with a Littrow angle auto-collimation light path of the two-dimensional reflection grating. Y-axis displacement is obtained by heterodyne interference signals formed by beam combination of light returned by the two-dimensional reflection grating in the position space of the one-dimensional grating, and X-axis displacement and Z-axis displacement are obtained by joint calculation of interference signals diffracted and separated by the combined grating. The system is symmetrical in light path, compact in structure, quasi-common in light path, capable of effectively restraining environment temperature excursion and mechanical vibration, and suitable for multi-degree-of-freedom high-precision positioning measurement.

The application relates to the technical field of sound field reconstruction, and particularly discloses a complex sound field reconstruction method and system based on a physically constrained diffusion model, which comprises the following steps: adopting a complex sound pressure form to represent a source plane complex sound field as an original clean sample of a diffusion model; gradually injecting Gaussian noise into the source plane complex sound field to construct a forward diffusion process, and training a conditional denoising network to predict corresponding noise components under the condition of a given diffusion time step and a target plane amplitude; using the predicted noise components of the conditional denoising network to back-propagate a clean sample estimation corresponding to the current time step, reconstructing the clean sample estimation into a complex field form to obtain a source plane complex sound field estimation; introducing an angular spectrum method as a display acoustic propagation model, inputting the source plane complex sound field estimation into the acoustic propagation model for propagation calculation to obtain a reconstructed complex sound field of the target plane. The application realizes stable prediction of a source plane complex amplitude hologram by modeling a conditional distribution in a high-dimensional continuous complex field space.

The invention relates to a packaging substrate optimization method, computer equipment and a storage medium, and the method comprises the steps: providing an initial packaging substrate which comprises a layer-adding wiring layer and a semiconductor chip electrically connected with the layer-adding wiring layer, the layer-adding wiring layer comprises a signal layer, and a power supply plane layer and a ground plane layer which are respectively positioned on two opposite side surfaces of the signal layer, the signal layer comprises a plurality of signal lines, the power supply plane layer comprises a plurality of reference power supply planes, the ground plane layer comprises a reference ground plane, and the semiconductor chip is electrically connected with the corresponding signal lines in the layer-adding wiring layer; obtaining a target power supply plane, wherein the target power supply plane is at least one reference power supply plane which has the greatest influence on the signal far-end crosstalk resonance; replacing a part of the target power supply plane with a reconstructed ground plane, and electrically connecting the reconstructed ground plane with a reference ground plane in the layer-adding wiring layer through a backflow ground hole to form the packaging substrate. Far-end crosstalk is reduced, and signal integrity is improved.

The application discloses a method for regulating and controlling cosine multi-Gaussian associated structured light field, comprising the following steps: introducing hyperbolic cosine function and multi-Gaussian function, constructing weight function and kernel function based on the hyperbolic cosine function and the multi-Gaussian function; introducing a partial coherent light construction formula, combining the weight function and the kernel function to construct the cross-spectral density function of the cosine multi-Gaussian associated structured light field at a source plane; introducing a free space transmission formula, constructing the light intensity expression of the cosine multi-Gaussian associated structured light field at an arbitrary transmission distance according to the cross-spectral density function, i.e. the expression of the cosine multi-Gaussian associated structured light field; adjusting the transmission distance and the parameters of the cosine multi-Gaussian associated structured light field to obtain the light intensity distribution regulation of the cosine multi-Gaussian associated structured light field, and then obtaining the array form of the sub-beam as a flat-top beam according to the light intensity distribution regulation; the application can realize the controllable transmission of the cosine multi-Gaussian associated structured light field and effectively regulate and control the array form of the sub-beam as a flat-top beam.

An optical projection system is described that may be used in an optical computing element. The optical projection system has an optical axis and comprises first, second and third lens arrangements. The first and third lens arrangements are rotationally symmetric about the optical axis and are positioned to capture light from an array of sources on a source plane and image the sources onto an output plane. The second lens arrangement is positioned between the first and third lens arrangements. The second lens arrangement has optical power of a first magnitude in a first orientation and optical power of a second magnitude in a second orientation, wherein the first magnitude is larger than the second magnitude and wherein the first orientation is orthogonal to the second orientation and both the first and second orientations are orthogonal to the optical axis.

The present disclosure provides a point cloud registration method, an apparatus and electronic equipment based on plane fitting, after obtaining the source point cloud and the to-be-registered point cloud, two non-parallel source planes in the source point cloud and two non-parallel to-be-registered planes in the to-be-registered point cloud are determined, a rotation matrix is calculated based on the two source planes and the two to-be-registered planes, and a translation vector is obtained based on the source point cloud and the to-be-registered point cloud. Finally, the to-be-registered point cloud is rotated and translated according to the rotation matrix and the translation vector, to realize a registration between the to-be-registered point cloud and the source point cloud. The present solution realizes the registration based on a correspondence between planes, rather than based on local features of points, which can greatly reduce amount of calculation and sensitivity to noise.

The invention discloses a miniature projection system and near-to-eye display equipment, which are used for projecting a non-self-luminous image placed on an image source surface to a projection surface, and comprise a first prism, a second prism and a PBS prism, wherein the illumination light is linearly polarized light, and the illumination light enters the PBS prism, is reflected by the polarization beam splitting surface, enters the first prism through the second prism, is sequentially reflected by the third surface and the second surface, is emitted from the incident surface, and is emitted to the image source surface; image light is configured to be linearly polarized light with the polarization direction converted after illumination light is reflected by the image source surface, the image light enters the first prism through the incident surface, is reflected by the second surface, is reflected by the third surface, penetrates through the second surface, then penetrates through the second prism and then enters the PBS prism, and the image light penetrates through the polarization beam splitting surface, then is emitted from the PBS prism and is emitted to the projection surface. According to the micro projection system, the imaging light path and the illumination light path share the first prism, the second prism and the PBS prism, light path folding is achieved, and the size of the projection system is greatly reduced.

The invention relates to radar detection and wireless communication technologies, in particular to a frequency-adjustable low-scattering resonant cavity antenna based on mixed metamaterials and a design method. The resonant cavity antenna comprises a metamaterial covering layer structure and a reflecting layer structure; the metamaterial covering layer structure and the reflecting layer structure form a resonant cavity with an adjustable distance, and the interior of the resonant cavity is a free space; the metamaterial covering layer structure is used for rotating electromagnetic waves to the orthogonal direction and comprises an upper polarization rotating metamaterial surface and a lower frequency selection metamaterial surface, and a first dielectric substrate is arranged in the middle of the metamaterial covering layer structure. The reflecting layer structure comprises a radiation structure on the upper surface and a metal floor on the lower surface, and a second dielectric substrate is arranged in the middle. The working frequency of the antenna can be flexibly adjusted, the radar cross section is remarkably reduced, and the antenna has the advantages of low cost, light weight, high gain and high integration degree with an active plane circuit.

The present disclosure relates to the technical field of vacuum equipment, and discloses a sample table and a vacuum processing system. The sample table comprises a sample mounting seat, a rotating shaft, a cold screen assembly, a plane bearing and a rotating driver. The rotating shaft is connected with the proximal end of the sample mounting seat and used to drive the sample mounting seat to rotate. The cold screen assembly is sleeved outside the rotating shaft and used as a cold source. The plane bearing is sleeved outside the rotating shaft and used to rotationally connect the sample mounting seat and the cold screen assembly and conduct heat between the sample mounting seat and the cold screen assembly. The rotating driver is fixedly connected with the cold screen assembly, the output end of the rotating driver is connected with the rotating shaft, and the rotating driver is used to drive the rotating shaft to rotate so as to drive the sample mounting seat to rotate.

An optical lens assembly includes, in order from a visual side to an image source side: a first lens with positive refractive power; an optical element including, in order from the visual side to the image source side, an absorptive polarizer, a reflective polarizer and a first phase retarder; a second lens with positive refractive power; a partial-reflective-partial-transmissive element; a second phase retarder; and an image source plane. The optical lens assembly has a total of two lenses with refractive power. A focal length of the optical lens assembly is f, a maximum image-source height of the optical lens assembly is INM, a focal length of the first lens is f1, a focal length of the second lens is f2, and following conditions are satisfied: 0.40<IMH / f<1.26 and 0.21<f2 / f1<2.35. A head-mounted electronic device includes the optical lens assembly.

The invention provides a sunlight focusing direction searching method based on CATIA. The sunlight focusing direction searching method comprises the steps that a lens three-dimensional model and part three-dimensional models arranged around a lens are constructed; a sunlight source model is read, a sunlight source plane in the sunlight source model enters the lens at different azimuth angles, and the current incidence azimuth angle of sunlight is selected; collecting the maximum irradiance value of parts around the lens in the current incidence direction, and calculating the ratio of the maximum irradiance value to the reference irradiance when the sunlight is directly irradiated in the non-focusing state; when the ratio is greater than or equal to a set ratio threshold value, determining that the sunlight of the current azimuth angle has a focusing risk; and changing the current incident azimuth angle of the sunlight until all azimuth angles in the sunlight source plane of the sunlight source are traversed, and determining the azimuth angle with the maximum specific value in the focusing risk as the solar focusing direction of the lens. And the risk of heat accumulation or equipment damage caused by sunlight focusing is reduced.

The invention belongs to the technical field of light field display, and particularly discloses a strict scalar light field calculation solving method and system. Comprising the steps of obtaining complex amplitude distribution on a source plane; based on a strict scalar diffraction theory, complex amplitude distribution on a source plane is combined, and strict scalar light field distribution of an observation plane is calculated and solved. On the basis of the scalar diffraction theory, a light field propagation model under any propagation distance is constructed, approximate errors in a geometric correction method are avoided through a strict scalar light field propagation method, the constraint of a scalable angular spectrum propagation model in the propagation distance is overcome, and the Abbe diffraction limit resolution is achieved through a phase recovery algorithm.

The invention discloses a method for analyzing and calculating a sub-beam virtual source in a multi-beam electron optical system and a related device. The method comprises the following steps: acquiring a transfer mapping relation from an emitting surface to a beam splitting diaphragm plane; obtaining a tangent equation T1 of the off-axis beamlet center electron trajectory R1 on the diaphragm plane and a tangent equation T2 of the paraxial electron trajectory R2 on the diaphragm plane based on the transfer mapping relation; virtual source plane positions of the off-axis beamlets on the meridian plane and the sagittal plane are calculated based on the tangent equation T1 and the tangent equation T2; calculating the Gaussian virtual source position of the off-axis beamlet according to the virtual source plane positions of the off-axis beamlet on the meridian plane and the sagittal plane of the off-axis beamlet; calculating the virtual source size on the meridian plane and sagittal plane corresponding to the off-axis beamlet caused by aberration according to the off-axis beamlet Gaussian virtual source position; and calculating virtual source sizes of the off-axis beamlets on the meridian plane and sagittal plane corresponding to the off-axis beamlets caused by the transverse thermal initial velocity based on the tangent equation T1 and the tangent equation T2.

The application discloses a kind of for super-long high-resolution acoustic beam focusing acoustic hologram generation method, comprising: the source plane phase of the M target surfaces of the M focal points of the jth iteration is determined when the jth iteration;M focal points of the jth iteration are numbered, and acoustic holographic lens is generated based on numbering, and the mask plate of target surface is generated according to acoustic holographic lens;The jth coefficient is generated, and the jth global sound source phase is generated according to the jth coefficient, mask plate and source plane phase;Whether the jth global sound source phase and the amplitude of target surface satisfy the condition based on the degree of approach of the jth M focal points of sound pressure amplitude;If yes, acoustic hologram is generated according to the jth global sound source phase;Otherwise, the spacing of the M focal points of the jth iteration is adjusted, the M focal points of the jth optimization are obtained and the j+1th iteration is carried out until acoustic hologram is generated.The application can form super-long distance ultrasonic focusing under the premise of ensuring the diameter of small acoustic beam.

An optical lens assembly includes: a first element group, including a first lens group, a partial-reflective-partial-transmissive element and a first optical layer that is located on a visual-side surface of a lens of the first lens group closest to a visual side and includes, in order from the visual side to an image source side, a first absorptive polarizer, a reflective polarizer and a first phase retarder; a second element group, including a second lens group and an image source plane; and a second optical layer, located between the partial-reflective-partial-transmissive element and the image source plane and including, in order from the visual side to the image source side, a second phase retarder and a second absorptive polarizer. When the optical lens assembly satisfies a specific condition, the weight of the device can be reduced, the zoom function can be provided, and the image quality can be ensured.