13 results about "Incident field" patented technology

The present application relates to a kind of information recovery methods based on scattering system, belong to spectral data processing technical field.The method is: the scattering characteristic of scattering system is calculated;Using the scattering characteristic calculated, establish scattering signal self-excitation amplification mechanism;On the scattering signal self-excitation amplification mechanism, incident light field time domain, space domain, frequency domain coding and trend decoding, wave analysis, to nearly completely recover scattering information;Using negative correlation statistical operation obtains the accurate scattering information of high noise scattering system.The present application is amplified by the scattering signal of special self-excitation method, based on light field composite coding and scattering information trend analysis, accurately judges input field information;By introducing negative correlation operation, can nearly completely recover incident field information, realize the nearly complete evaluation of the scattering characteristic of extremely high noise system.The present application promotes the progress of imaging technology not limited by the thickness of scattering medium, further promotes the development of realizing human clinical high-resolution optical reflection, transmission imaging.

The application discloses a high-power phase reconfigurable intelligent reflecting surface which is composed of array elements with the same structure; the array element comprises a receiving / transmitting unit, a coupling structure and a phase modulation circuit; the receiving / transmitting unit, the coupling structure and the phase modulation circuit are sequentially arranged to form a laminated structure; the receiving / transmitting unit is used for converting a free space electromagnetic wave into an electric field on the unit or converting a field from the coupling structure into a free space electromagnetic wave and radiating; the coupling structure converts the electric field into a guided wave which is transmitted to the phase modulation circuit, and converts a guided wave from the phase modulation circuit into an electric field on the receiving / transmitting unit; and the phase modulation circuit uniquely determines a shift operation of the guided wave according to an applied direct current voltage to add a specific additional phase. While realizing 360-degree phase control, the application has higher power capacity, and is expected to be widely applied in a high-power incident scene of the intelligent reflecting surface.

The application discloses a fast calculation method and device for scattered electromagnetic field based on random matrix approximation, and belongs to the field of fast modeling of scattered field. The method comprises the following steps: precalculating an incident field vector and a reciprocal incident field vector; generating a Gaussian random matrix matched with the column number of a to-be-determined scattered response matrix; performing linear superposition on the incident field vector to obtain a synthetic incident field vector, and constructing a random projection matrix according to the scattered field vector of an equivalent current vector at a receiving point; performing linear superposition on the reciprocal incident field vector to obtain a reciprocal synthetic incident field vector, and constructing a projection coefficient matrix according to the response of a reciprocal equivalent current vector at a transmitting source; and calculating a complete scattered response matrix based on the product of an orthogonal basis matrix and the projection coefficient matrix. In the application, a large-scale geophysical electromagnetic complex scene can be adapted, higher calculation precision and stable convergence are achieved, and the reconstruction of the complete scattered response matrix can be completed at a lower relative error level.

This invention relates to a microwave imaging method integrating Born iteration and compressed sensing, comprising: establishing a two-dimensional electromagnetic inverse scattering integral equation model, discretizing the imaging region, setting iteration and prior parameters, and initializing the contrast and total field as background values ​​and incident fields, respectively; based on the total field of the previous iteration, constructing linearized scattering equations for multiple incident angles, defining single-view inversion as an independent task, and integrating them into a multi-task set sharing sparse priors; employing the MT-BCS algorithm to jointly solve the observation equations using shared hyperparameters, and outputting the updated contrast distribution; solving the state equation based on the new contrast to complete the total field update; outputting the imaging result if the convergence condition or the maximum number of iterations is met; otherwise, continuing iteration. This invention applies joint sparsity constraints through a multi-task joint inference mechanism, mining the geometric structure consistency of multi-view data, and overcoming the shortcomings of traditional single-task methods such as low signal-to-noise ratio, low reconstruction accuracy when measurement data is limited, and severe artifacts.

The invention discloses an electromagnetic near-field scattering characteristic modeling calculation method based on half-space target source reconstruction and electronic equipment. The method comprises the following steps: modeling the ground into an infinite PEC, and constructing a surrounding surface for a target scatterer on the ground and a ground area in contact with the target scatterer; calculating an incident field of the incident wave on the surrounding surface, and solving equivalent electromagnetic current distribution on the surrounding surface by taking the incident field as an excitation source; removing a target scatterer in the surrounding surface, and performing integration on the equivalent electromagnetic current distribution by using a half-space green function to obtain a part of scattered field at the observation position; and calculating a background field of the observation position when only the incident field is incident on the infinite ideal electric conductor ground, and adding the background field and a part of the scattered field to obtain a total electromagnetic field of the observation point. Half-space target source reconstruction is carried out based on the Huygens equivalence principle, the model complexity is greatly reduced, the operation efficiency is remarkably improved, the problem of ground truncation is solved, and meanwhile, the method is suitable for far-field and near-field scenes.

The invention discloses an electromagnetic inverse scattering imaging method of a diffusion model based on multi-modal fusion features. The method comprises the following steps of: 1, delimiting a region of interest in a specific imaging environment, and arranging a transmitting antenna and a receiving antenna array at the periphery of the region of interest; collecting scattering field data of a to-be-tested scatterer in a free space, and constructing an input and output sample pair of the model in combination with incident field information and a corresponding medium parameter distribution truth value; 2, inputting the multi-modal condition data in the training sample pair into a corresponding feature extraction network for coding, and performing adaptive fusion through a cross-modal attention mechanism to generate fusion features; 3, constructing a diffusion model taking fusion features as conditions; and noise is added to the true value of the medium parameter through a forward diffusion process, and in a reverse denoising process, a denoising neural network is guided by using fusion features to predict noise, and a medium parameter distribution image of the region of interest is reconstructed step by step. The stability and generalization performance are remarkably improved.

The invention provides a high-order CM24-Debye electromagnetic scattering calculation method for SAR (Synthetic Aperture Radar) image data generation, and relates to the technical field of electrical digital data processing, the method comprises the following steps: S1, under a CM24 high-order difference framework, constructing an auxiliary differential equation updating model of a Debye dispersion earth surface medium, and obtaining a main calculation area of the CM24 electromagnetic scattering model containing the Debye dispersion earth surface and the target body above the Debye dispersion earth surface. According to the method, an auxiliary differential equation updating model of a Debye dispersive medium is constructed under a CM24 high-order difference framework, so that high-order consistent calculation of dispersion earth surface electromagnetic response is realized; in a rough earth surface and a target scattering model above the rough earth surface, a discrete plane wave and a conical wave are combined at a connection boundary to load a loading field, so that the numerical dispersion of an incident wave is consistent with a main computational grid, and the edge diffraction influence caused by a limited truncation rough surface is reduced; and meanwhile, a complete matching layer absorption boundary based on a matrix index method is constructed, so that the absorption layer update is synchronized with the time step of the main calculation area.

The application provides an endoscope objective lens, and relates to the technical field of medical devices, which comprises, from the object side to the image side, a first spherical lens with negative optical power, a second spherical lens with positive optical power, a third spherical lens with negative optical power, a fourth spherical lens with positive optical power, a fifth spherical lens with positive optical power, a filter and a protective glass; the incident surface of the first spherical lens towards the object side comprises a plurality of different coating areas, the coating areas have different filter films, and the field angles of the plurality of coating areas are different. Through the shape, optical power and related parameter settings of each spherical lens, the endoscope objective lens has the advantages of a large field angle, miniaturization and a large depth of field, and through the partition coating, the transmittance curve and the reflectivity curve caused by the change of the incident field angle are reduced, the light of the cut-off laser band is blocked, the anti-laser effect of the coating is ensured, and under the condition of no laser, the color deviation during the imaging of the large field angle is eliminated, and the image quality is improved.

This application provides a method and system for measuring the dielectric constant of a material. The method includes: acquiring the incident field distribution of a transmitting antenna on a reference plane in the absence of a material sample; placing the material sample to be tested between the transmitting antenna and the receiving probe, measuring the transmission coefficient in the absence of a material sample and in the presence of a material sample, and processing the transmission coefficient to obtain a measured normalized transmission coefficient; constructing a forward physical transmission model based on the incident field distribution, wherein the forward physical transmission model takes the geometric parameters and dielectric constant of the material sample to be tested as input and outputs a theoretical normalized transmission coefficient; and determining the dielectric constant of the material sample to be tested by adjusting the assumed value of the dielectric constant to make the theoretical normalized transmission coefficient approximate the measured normalized transmission coefficient.

A wide-field-of-view narrow-band light filtering device comprises a narrow-band light filter and a plurality of wide-field-of-view interference assemblies. The beam splitter prism is used for carrying out beam splitting treatment on input light and transmitting the input light to the two plane mirrors respectively; the two plane mirrors reflect the received light beams to the beam splitter prism so as to generate two interference light beams; by observing interference light spots output by the wide-view-field interference assembly, the position of the plane mirror in the wide-view-field interference assembly is adjusted, so that the intensity of signal light returned by an original path is reduced; the first-stage wide-field-of-view interference assembly receives laser radar echo light beams transmitted through the narrow-band optical filter, and the front and rear adjacent wide-field-of-view interference assemblies receive signal light output by the upper-stage wide-field-of-view interference assembly through beam splitting prisms in the front and rear adjacent wide-field-of-view interference assemblies. According to the invention, ultra-narrow band filtering in a large incident field of view can be realized, so that background light interference is suppressed while high transmittance of effective signals is ensured, and the purpose of improving the detection signal-to-noise ratio is achieved.

The utility model provides a kind of laser on-line monitoring dynamic cleaning device, comprising: thickness detection component;Laser cleaning component, laser cleaning component includes several laser units;Each laser unit includes the laser along the laser beam output direction setting, first reflector, diaphragm, second reflector, beam expander, laser beam shaper, dynamic galvanometer, field lens;Wherein, dynamic galvanometer includes several multi-faceted prisms connected with driving element, to dynamically adjust the angle of laser beam incident field lens;The utility model can adapt to different pollution degree and surface shape, ensure that cleaning quality consistency, by being provided with dynamic galvanometer and carrying out dynamic cleaning, can ensure that laser focal point is always accurate and accurate to adhere graphite boat curved surface, cleaning efficiency is high and clean, can avoid overburning or residual caused by uneven energy.

The invention relates to the technical field of performance evaluation of electromagnetic shielding materials, in particular to a comprehensive performance evaluation method of an absorption type electromagnetic shielding material. The method comprises the following steps: constructing a comprehensive evaluation index system; the total shielding effectiveness, the reflection loss and the absorption loss of the material are obtained through a far field test, and an absorption coefficient, a reflection coefficient and an absorption dominant factor are determined; through a cavity effect test, comparing the internal field intensity of the cavity with the incident field intensity when the shielding body exists, and determining a cavity field intensity attenuation factor; determining an effective absorption bandwidth according to the absorption coefficient changing curve along with the frequency; determining a near-field absorption coefficient through a near-field test; integrating the indexes into a multi-dimensional evaluation vector, setting a weight according to an application scene, calculating a comprehensive score, and dividing grades. According to the method, multi-dimensional quantitative evaluation of the comprehensive performance of the absorption type electromagnetic shielding material is realized, and research, development and model selection of the material can be effectively guided.

The utility model discloses a cabin body structure and panoramic monitoring equipment relates to monitoring equipment technical field, cabin body structure, include: cabin body, cabin body is equipped with several openings, several window components, airtight connection in several openings, and window component is used for making monitoring target light line enter cabin body, imaging module is located in cabin body, and imaging module includes multiple steady image components, and multiple camera components corresponding with steady image component one to one, and every steady image component is used for receiving the light line that corresponds to the incident field of view range of it and corresponds to enter by window component, and can reflect the light line to corresponding camera component position place. The cabin body structure, through airtight connection of window component and opening, guarantees the sealing effect of cabin body, through every steady image component only accepts the light line that enters through window component in its incident field of view range, guarantees the reliable imaging of monitoring target, can guarantee the imaging quality.