13 results about "Phase function" patented technology

The invention provides a particulate matter physical property determination method based on Mie scattering, and relates to the technical field of particulate matter physical property measurement, and the method comprises the steps: generating and capturing a single particle; performing lateral scattering phase function imaging and interference correction backscattering phase function imaging on the particles; respectively extracting each imaging result to obtain a first gray value distribution curve and a second gray value distribution curve; calculating lateral off-sphere scattering electric field distribution and interference correction back off-sphere scattering electric field distribution of the particles under different particle physical characteristic values; determining first and second light intensity distribution curves of the particles; determining the distance between the gray value distribution curve and the light intensity distribution curve which correspond to each other; determining a target distance meeting a corresponding condition in all the distances; taking a particle physical characteristic value corresponding to the target distance as a candidate physical characteristic value of the captured particle; and determining the physical characteristic value of the captured particles according to all candidate physical characteristic values. The invention aims to reduce the measurement cost of the physical characteristics of particles.

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 relates to a focus depth controllable Gaussian-Bessel beam generation method, a focus depth controllable Gaussian-Bessel beam generation device and a storage medium, and belongs to the technical field of laser processing. In the optimization process, a standard axicon phase corresponding to a target non-diffraction propagation length is introduced as a fixed initial value, the problems of slow convergence and uncontrollable focal depth caused by a random or zero initial value in a traditional method are avoided, rapid, flexible and controllable focal depth is realized, and by obtaining the actually measured light intensity along the optical axis direction, the target non-diffraction propagation length is optimized. Compared with numerical simulation light intensity point by point, a difference field matrix is constructed and fed back to an optimization process to iteratively update a phase function, so that not only is the uniformity of axial intensity improved, but also attenuation caused by tail energy collapse and environmental noise under a long focal depth condition is effectively inhibited, and the method has high robustness and practicability. The technology is suitable for scenes with extremely high requirements on uniformity and focal depth, such as laser precision processing, long focal depth microscopic imaging, optical communication and the like.

The invention discloses a three-dimensional optical focus regulation and control device, and relates to the technical field of micro-nano optics. The three cascaded metasurfaces are arranged to be capable of relatively rotating and moving, and the three metasurfaces have the synergistically designed phase distribution functions, so that decoupling control of axial focus change and transverse focus offset is realized. Specifically, a complementary rotation pair is formed by a second metasurface and a third metasurface, and the relative rotation of the second metasurface and the third metasurface is used for adjusting an axial focus and inhibiting aberration (such as coma and astigmatism) introduced by a lateral offset term at the same time; the relative rotation of the first metasurface and the second metasurface mainly regulates and controls an angular phase item to realize the lateral offset of a focus; due to the fact that the phase function is designed to be separable in angular modulation and radial modulation, controlled focuses can transversely move and axially move through different rotation pairs, and independence of the two control modes, namely decoupling regulation and control, is achieved.

In a three-dimensional (3D) display, a display panel having an array of subpixels may display an image according to stereo mapping coordinates associated with a viewer. A periodic optical element may direct light from the display panel to the viewer. The periodic optical element may be invariant along an optical axis having a slant angle relative to the display panel. A viewer tracker may determine a location of the viewer. The stereo mapping coordinate of a selected subpixel of the array of subpixels may be a function of the location of the viewer, a location of the selected subpixel, a phase function of the periodic optical element, a separation between the periodic optical element and the display panel, and a refractive index of a material disposed between the periodic optical element and the display panel.

The present application relates to the technical field of target detection, in particular to a target infrared polarization characteristic model construction method based on Monte Carlo method, comprising: S1, determining the position, scattering angle and azimuth angle of the scattered photon according to the propagation distance of the photon, the initial Stokes vector of the photon, the Mueller matrix and the phase function of the incident light when the photon occurs scattering; S2, updating the new Stokes matrix after the elastic interaction of the photon according to the rotation matrix and the initial Stokes vector; S3, updating the direction cosine of the scattered photon. The present application can construct a model for simulating the infrared polarization characteristics of the target.

The invention discloses a double-reflector antenna electromechanical coupling rapid analysis method and system, and aims to reconstruct a physical optical integral expression. Dispersing the reflecting surface into triangular grids, and performing linear fitting on amplitude and phase functions in each grid; an equivalent wave number / wavelength concept is introduced, a phase fitting error is analyzed, a differentiated grid processing strategy is put forward, a closed expression for calculating a far-field directional diagram is deduced through affine transformation and partial integration, and numerical integration is replaced by analytical calculation; and converting the structural deformation into an additional phase error, and integrating the additional phase error into a rapid calculation framework. The method breaks through the limitation of the traditional electromagnetic analysis on the grid size, greatly improves the electromechanical coupling analysis speed on the premise of guaranteeing the precision, and provides an efficient tool for the design and profile compensation of a high-frequency-band antenna.

The invention provides a method for an object to project a soft shadow in a volumetric fog environment, and relates to the technical field of computer images, and the method comprises the steps: carrying out the volumetric fog generation of a built rendering scene, obtaining a target scene, and determining a target distance from a shadow pixel point to an upper shielding object; determining a phase scattering parameter value range corresponding to the shadow pixel point according to the target distance and the illumination intensity; determining the maximum scattering angle corresponding to the shadow pixel point based on the phase scattering parameter value range and the phase function texture; determining a sampling range corresponding to the shadow pixel point according to the target distance and the maximum scattering angle; determining the soft shadow intensity grade of the shadow pixel point according to the depth information of the sampling pixel point in the sampling range; and performing shadow synthesis rendering on the target scene according to the respective soft shadow intensity levels of all shadow pixel points. The objective of the invention is to improve scene rendering credibility.

The invention relates to a personalized aberration compensation and depth-of-field fusion type implantable contact lens based on calculation optical wavefront regulation and control, and belongs to the crossing field of ophthalmic medical instruments and calculation optics. A composite wavefront regulation and control structure is formed on at least one optical surface of an optical area of a lens main body of the contact lens; a target phase function corresponding to the composite wavefront regulation and control structure is a two-dimensional function and at least comprises an aberration compensation phase term used for compensating wavefront aberration of a target eyeball and a depth-of-field extension phase term used for generating an extension focal depth; the target phase function is determined through a computational optical reverse optimization method, the optimization process aims at improving the imaging quality of the eyeball-ICL combined optical system under a plurality of preset object distances, and meanwhile, the expected positioning error of the ICL relative to the pupil is used as a robustness constraint condition. The problems of individualized aberration correction and continuous depth-of-field expansion are solved, and a novel ICL solution with high visual quality, high clinical robustness and manufacturability is provided.

Disclosed in the present invention are a phase encoding-based super-resolution imaging system and a super-resolution method, used for improving the imaging resolution and imaging signal-to-noise ratio of a visible light imaging system. The super-resolution imaging system consists of a main imaging lens, a first 4f relay lens, a phase mask, a second 4f relay lens, a camera, and an electric rotating stage. By optimizing a phase function of the phase mask, a transfer function of the super-resolution imaging system has anisotropy on a certain frequency component. The electric rotating stage controls the rotation regulation of the phase mask and the camera captures a series of encoded low-resolution images. By mean of joint spatial- and frequency-domain constraint iteration, the captured images are reconstructed until an algorithm converges, so as to obtain reconstructed images that break through Nyquist sampling. Compared with being based on intensity mask encoding, the method can implement the regulation and control of the anisotropy of a point spread function without losing luminous flux, thereby achieving an imaging resolution improvement of more than 2.5 times.

This invention discloses a robust imaging method and system for maneuvering targets based on Hough transform and coherent cumulative phase function. It primarily addresses the problems of high computational complexity and the susceptibility to image quality issues caused by multi-target cross-terms in existing target imaging methods. The solution includes: receiving echoes and performing range pulse compression; correcting range migration using Hough+SOKT transform; extracting the echoes in the range cells after range migration correction and establishing a delay cross-correlation function for order reduction; jointly estimating the coefficients of the second and third terms using the CICPF algorithm; constructing an azimuth matched filter to pulse-compress the echoes after range migration correction; and processing the pulse-compressed echo data using range IFFT and azimuth FFT to obtain a precisely focused target image. This invention avoids joint parameter search and avoids cross-terms between multiple targets by first correcting migration and then extracting cell order reduction, thus improving imaging quality. It can be used for the reconnaissance of maneuvering targets such as ships and aircraft.

The application discloses a kind of parallel three-dimensional isotropic super-resolution imaging methods based on Bessel beam self-interference field, comprising the following steps: S1: double-focus phase function is loaded to excitation light, and Bessel beam with axial symmetry bifocal point is formed;S2: double-focus Bessel beam is focused to sample region, and reflective interface is introduced in bifocal symmetric center position, so that incident light and reflected light occur self-interference, and multiple isotropic interference focal points of axial equidistant distribution are generated in sample space;S3: the superhigh-order nonlinear fluorescent probe contained in sample is excited using interference focal point, and the point spread function is compressed by superhigh-order nonlinear effect, and fluorescence signal is generated;S4: the fluorescence signal of different axial positions is separated to different regions of detector by multi-plane prism;S5: the fluorescence signal after separation is synchronously collected and three-dimensional image is reconstructed.The application has the advantages compared with prior art: axial parallel scanning and three-dimensional isotropic super-resolution imaging are realized under single objective architecture, and resolution improvement, imaging speed and system structure simplification are considered.

The invention discloses a three-dimensional detection method and device based on a structured photon light field, and belongs to the field of optical measurement, and the method comprises the steps: generating the structured photon light field, and irradiating a target region where a to-be-detected three-dimensional target is located through a two-dimensional scanning mode; receiving an echo signal reflected by the target area; performing time-resolved acquisition on the echo signal by using a single-photon detection mode to obtain initial three-dimensional data; calculating flight time corresponding to each point in the three-dimensional target to be detected according to the initial three-dimensional data, and calculating depth information of each point in the three-dimensional target to be detected according to the flight time to realize three-dimensional target detection; the structural photon light field is a spatial structure light field carrying a radial phase gradient, and the initial complex amplitude of the structural photon light field meets the following conditions: the structural photon light field is a Gaussian amplitude distribution function and is a phase function changing along with radial coordinates. According to the invention, the resolution and stability of three-dimensional target detection in a complex environment can be improved.