618 results about "Incident wave" patented technology

The invention provides a blade lightning protection channel online test method and system based on a pulse current method, and belongs to the technical field of blade lightning protection detection.The method comprises the steps that a pulse waveform is generated through a pulse current generator to simulate lightning impulse, and the lightning impulse is injected into the surface of a lightning arrester of a blade lightning protection system; measuring channel currents at different positions of the surface of the lightning arrester in the length direction by using a distributed sensor; a high-voltage differential probe is used for collecting and measuring the waveform of an incident wave and the waveform of a reflected wave of an injection point; detecting blade surface potential distribution by using a capacitive coupling sensor; comparing the waveform of the incident wave, the waveform of the reflected wave and the theoretical waveform, determining a time domain reflection coefficient and a frequency domain impedance spectrum, and determining a fault type; after the fault type is determined, the fault point is positioned based on the channel current and the blade surface potential distribution, the lightning impulse is simulated through the pulse waveform, the lightning protection channel is further tested, shutdown is not needed, the testing efficiency of the blade lightning protection channel is effectively improved, and the power generation efficiency is ensured.

The invention provides an RCS prediction method based on deep learning, computer equipment and a readable storage medium. The method comprises the following steps: firstly, constructing an electromagnetic simulation model of a target, and resolving to obtain noise-free RCS sample data corresponding to different incident wave angles; and then simulation errors are introduced to form noise sample data. Then, constructing a convolutional auto-encoder network as an RCS denoising model, and training the RCS denoising model by using noise-containing and noise-free sample data; and then a deep neural network model is built based on a grey wolf algorithm to serve as an RCS prediction model, the trained denoising model is used for preprocessing the training data set, then the prediction model is trained, and finally prediction of a target RCS value is achieved. According to the method, the GWO-DNN deep learning model is constructed for prediction, so that the dependence on a physical mechanism and the manual parameter adjustment cost are reduced. Meanwhile, noise reduction preprocessing is carried out on the actually measured RCS result through CDAE, the too high influence of measurement errors on the prediction result is overcome, and the RCS prediction precision is improved.

The invention discloses a radio frequency calculation method and system based on a time coding metasurface. The metasurface is composed of a metal patch layer, an F4B dielectric layer and a metal backboard layer. By applying a specific periodic control signal, the metasurface can modulate electromagnetic information of an incident wave. A baseband signal of the incident electromagnetic wave represents a time function needing to be operated, and a control signal of the metasurface corresponds to a coding sequence needing to be operated. After the electromagnetic wave interacts with the metasurface, a reflection echo carries information of an operation result, and Fourier transform and convolution operation can be directly carried out in a radio frequency domain. According to the method, conversion of radio frequency signals is omitted, and calculation is directly completed in a radio frequency domain, so that calculation time delay and energy consumption can be effectively reduced; meanwhile, due to the fact that a traditional radio frequency link is omitted, the radio frequency calculator constructed through the metasurface has low hardware complexity and cost and a simple structure on the premise that the calculation precision is guaranteed, and the method is suitable for the application fields of communication, radar, sensing and the like.

The invention discloses a wind driven generator blade lightning conductor broken line point positioning method based on a radio frequency transformer, and relates to the field of wind driven generator blade lightning conductor broken line point positioning. A to-be-detected line is connected in series with the radio frequency transformer before being injected into traveling waves, and the change of traveling wave current is converted into the change of transformer output voltage; therefore, the output voltage of the radio frequency transformer is detected to judge the arrival time difference of the incident wave and the reflected wave, and then the breakpoint position is judged by multiplying the wave velocity by the time difference and dividing by 2. According to the wind driven generator blade lightning conductor breaking point positioning method based on the radio frequency transformer, the position of the lightning conductor breaking point can be efficiently, accurately, conveniently and flexibly detected at low cost, positioning measurement of disconnection of a multi-core wire part can be achieved, the specific positions of the breaking point and an abnormal point of the lightning conductor can be effectively determined, and the working efficiency is improved. After the positions of the broken line point and the abnormal point are determined, specific positions are repaired in a targeted manner, so that the cost for replacing the lightning conductor is saved.

The invention discloses an electromagnetic simulation multi-scale region segmentation method based on deep learning, and the method comprises the steps: constructing and training a deep learning model which is used for recognizing a key region and a non-key region in an electromagnetic simulation region; in the training process, a data set is labeled, and the model performance is optimized by using a cross validation method; simulating the key area by adopting a full-wave solution method to obtain field distribution of the key area; simulating the non-critical area by adopting a high-frequency approximation method, and simulating an electromagnetic field generated after an incident wave is reflected by the surface of an object; dynamic boundary conditions are generated at the boundary of the key area and the non-key area, and continuity and consistency of field values are ensured. According to the method, in a large-scale electromagnetic simulation scene, through combination of deep learning and a mixed solution strategy, optimal configuration of computing resources is achieved, limited computing force is focused on a high-precision demand area, and simulation efficiency and overall performance are remarkably improved.

The invention belongs to the technical field of electronic materials, and particularly relates to a broadband side wall graphical wave-absorbing honeycomb structure. Through the design mode that the strip-shaped resistive films are arranged at equal intervals according to the width and form the included angle with the honeycomb aperture Z direction to be fully distributed on the inner walls of the honeycomb units in parallel, the spiral-like structure design of resistive film stripes is finally formed on the inner walls of the honeycomb units, and the anisotropy of the effective dielectric constant of the wave-absorbing honeycomb structure is effectively improved; the polarization of the structure is insensitive; in addition, during processing of the structural design, the influence of pattern dislocation caused by process precision is extremely small. And the spiral-like structure design enables alternating impedance to be formed along the aperture direction, so that more times of reflection and absorption are formed on the inner walls of the honeycomb holes due to the arrangement angle of the strip-shaped resistive film after incident waves are incident, the impedance matching with air in a broadband range is effectively improved, and the 2-18GHz ultra-wideband wave-absorbing performance is realized.

The invention provides a multivariate numerical analysis method and system based on a TEHB test system, and the method comprises a multidirectional synchronous impact test numerical simulation step: building a rock numerical model with a real mineral structure and breakable mineral crystals, and constructing a single-axis bidirectional synchronous impact test simulation frame, the multi-directional synchronous impact test simulation module is used for implementing multi-directional synchronous impact test numerical simulation on the rock numerical model; a dynamic response index calculation step: separating and recombining the incident wave signal and the reflected wave signal obtained by monitoring, and obtaining a dynamic response index of the rock numerical model in the impact process; and a multi-element parameter intelligent analysis step: during numerical simulation of the multidirectional synchronous impact test, displaying spatial distribution characteristics of different types of cracks in real time, and realizing intelligent microscopic analysis of crack evolution, rock damage and energy characteristics. According to the invention, the dynamic mechanical behavior of the rock under the impact load can be simulated, and the real-time fracture information in the rock can be displayed more visually.

The present disclosure relates to direction of arrival (DOA) estimation systems and super-resolution DOA estimation devices. An example system comprises a diffraction modulator configured to modulate phase distribution of electromagnetic fields of incident waves emitted by N signal sources to focus the incident waves on a detector, the DOAs corresponding to the signal sources within a preset angle range. The detector comprises a plurality of detection areas, the preset angle range comprising a plurality of angle intervals, each detection area corresponding to one angle interval. The detector is configured to measure intensity of an electromagnetic field in each detection area in response to the incident waves being focused on the detector to obtain an intensity measurement value of the electromagnetic field in each detection area, and determine the DOAs corresponding to the N signal sources based on angle intervals corresponding to N detection areas with greatest intensity measurement values.

The invention relates to a multi-spectral wavefront aberration restoration method and system based on double roof prisms, and the method comprises the following steps: taking a sub-pupil image as the input of a classification model, obtaining classification feature data, and carrying out the data expansion of the classification feature data, the sub pupil image is obtained by inputting incident wavefront aberration into a simulation light path of the double-ridge prism wavefront sensor, the double-ridge prism wavefront sensor comprises two groups of double-ridge prisms, each group of double-ridge prisms comprises two ridge prisms which are vertically and oppositely arranged, the characteristics of the ridge prisms are equal, and the characteristics of the double-ridge prisms are equal. The two groups of double-roof prisms are made of a material combination for eliminating chromatic aberration; splicing the sub pupil images and the classification feature data after data expansion to serve as input of a regression model, and obtaining a Zernike coefficient matrix corresponding to incident wavefront aberration; and according to the Zernike coefficient matrix corresponding to the incident wavefront aberration and the Zernike polynomial, obtaining a recovered wavefront aberration. Compared with the prior art, the method has the advantage that the wavefront aberration recovery accuracy is improved.

The invention provides a spatial light modulator, a self-checking device thereof and a light computing device, and relates to the technical field of optical modulation.The spatial light modulator comprises an incident waveguide structure, a covering plate, a liquid crystal layer, a substrate and an emergent waveguide structure; the incident waveguide structure is optically coupled with the cover plate and is used for guiding externally incident laser into the cover plate at a preset angle; the covering plate is used for enabling laser to be propagated in the covering plate in a total reflection form; the substrate bears the liquid crystal layer, integrates the driving circuit and is used for applying regulation and control voltage to the liquid crystal layer; the liquid crystal layer is arranged on the lower side of the covering plate and used for conducting phase modulation on the laser transmitted to the liquid crystal layer in a total reflection mode in response to the regulation voltage. And the emergent waveguide structure is optically coupled with the covering plate and is used for guiding the laser modulated by the liquid crystal layer out of the covering plate to a free space. According to the spatial light modulator, efficient spatial modulation and accurate control of the light field are realized, so that the integration and function accuracy of the spatial light modulator in self-inspection and light calculation are improved.

The invention relates to a tide level obtaining method and system based on an OWC wave energy conversion device. The method comprises the following steps: constructing an energy loss prediction model in the air chamber; acquiring field incident wave energy, reflected wave energy, water potential energy increment, kinetic energy increment and pneumatic output energy at the current time period; inputting incident wave energy and reflected wave energy into the model to obtain predicted energy loss; and the tide level variation is solved based on the energy conservation relational expression, and the current tide level is calculated. The system comprises an energy loss prediction module, a wave energy acquisition module, a water body energy acquisition module, a pneumatic output acquisition module, an energy loss calculation module, a tide energy solving module and a tide level calculation module, which cooperatively realize the method. According to the scheme, an external tide gauge station is not needed, the local sea area tide level can be inversed in situ, at high frequency and with high precision, the method is suitable for an OWC-breakwater fusion scene, and cooperative operation of a port and ocean energy is supported.

The invention relates to a super-large L-shaped high-sea-condition high-precision absorption type wave maker system and a wave simulation method.The wave maker system comprises a central control layer, an equipment control layer and an execution mechanism layer which are sequentially connected, and the central control layer is characterized in that a main control computer operates wave making control software; a target wave time calendar curve is generated, theoretical motion instructions needing to be executed by the wave making plates are synchronously deduced, the main PLC conducts format conversion and time sequence synchronization processing on the theoretical motion instructions, and wave making plate displacement curve instructions are generated and issued; the equipment control layer is used for calculating active absorption compensation from the PLC and generating a motor motion instruction; the executing mechanism layer comprises a super-large L-shaped wave making unit, a fan-shaped driving arm, a plurality of motors and other assemblies to execute wave making motion and feed back wave height information, and the motors drive the fan-shaped driving arm to drive a wave making plate to swing around a hinge assembly and drive the wave making plate to execute compensation action opposite to the phase of incident waves; high-sea-condition wave simulation and high-precision wave active absorption are realized, and a full-wave-direction test with navigational speed is supported.

An antenna includes a supporting layer and a reflection element disposed on the supporting layer configured to reflect an incident wave with a respective reflection phase, the reflection element extending perpendicularly from the supporting layer at a height configured to achieve the respective reflection phase, and both the supporting layer and the reflection element being formed with an all-dielectric material. The antenna is not susceptible to metallic corrosion and has flexible design freedom. It is in a simple and compact structure for providing complete reflection and phase adjustment simultaneously. The simple structure of the antenna enables it to be manufactured in an efficient and cost-effective manner.

The invention belongs to the technical field of electromagnetic wave functional materials, and particularly relates to a nested split ring wave-absorbing metamaterial and a preparation method thereof. The wave-absorbing metamaterial sequentially comprises an FSS metal structure layer, a dielectric layer and a metal matrix layer from top to bottom in the thickness direction, the FSS metal structure layer is formed by distributing structure units in a periodic array mode, each structure unit is composed of a double-opening outer ring shaped like a Chinese character'hui 'and a double-opening inner ring, the double-opening outer ring is a split square, and the double-opening inner ring is a hollow square. The structural units are symmetrically arranged about the diagonal line of the dielectric layer. The FSS metal structure layer designed by the invention has anisotropy, so that the polarization direction of an incident wave can be rotated by 90 degrees in a reflection mode. By means of the design, the two functions of electromagnetic wave absorption and polarization conversion are achieved at the same time, and meanwhile the effect of multiband wave absorption is achieved. Within the frequency band of 4 GHz to 18 GHz, the maximum wave-absorbing strength of the nested wave-absorbing metamaterial is as high as-30 dB, and the effective wave-absorbing bandwidth can reach 7.5 GHz.

The invention relates to an incident wave loading method for simulating ground electromagnetic scattering based on FDTD. The incident wave loading method comprises the steps of solving an attenuation factor at a certain depth of a PML, arranging the side face and the bottom face of a connection boundary CB on the PML, establishing a ground electromagnetic scattering model, connecting the boundary to load an incident wave, and solving an electric field value and a magnetic field value of the loaded incident wave. According to the method, the four side faces and the bottom face of the connecting boundary CB are completely arranged on the PML, incident waves penetrate through the CB to enter the PML in a non-reflection mode, the edge effect generated by truncation of the periphery of the ground is effectively reduced, and the precision of ground electromagnetic scattering calculation is improved. The truncated ground is limited in a CB boundary area, and calculation of a reflection field and a transmission field is avoided. The method does not depend on ground parameters, and electromagnetic scattering calculation of rough ground and layered ground can be achieved.

The invention belongs to the technical field of antennas, and particularly relates to an ultrathin full-space metasurface unit with dual-band amplitude-phase regulation and control and a multi-beam generator. In order to solve the problems that component design cost is high, unit amplitude is low, and incident wave energy cannot be efficiently regulated and controlled, the full-space metasurface unit comprises a first metal layer and a second metal layer, the first metal layer is located above the second metal layer, a dielectric plate is arranged between the first metal layer and the second metal layer, and the dielectric plate is located between the first metal layer and the second metal layer. A first C-shaped groove and a double split ring resonator are etched on the first metal layer from outside to inside in a hollowed-out manner, a second C-shaped groove and an elliptical groove are etched on the second metal layer from outside to inside in a hollowed-out manner, and the opening directions of the first C-shaped groove and the second C-shaped groove are perpendicular to each other. And the multi-beam generator is designed based on the total space metasurface unit.

The invention relates to a concave quasi-continuous domain bound state terahertz metamaterial sensor, the sensor is provided with a plurality of periodic array units in horizontal and vertical directions, and each array unit is composed of a metal metasurface, a dielectric layer and a metal back plate from top to bottom, and the depth of the metal back plate is larger than that of an incident wave skin; wherein the metal metasurface is composed of two parts, one part is a cylindrical structure with a double-fan-shaped opening, the other part is a closed resonant ring, the left opening angle of the double-fan-shaped opening is not equal to the right opening angle of the double-fan-shaped opening, the cylindrical structure with the double-fan-shaped opening is located in the closed resonant ring, and a part of the cylindrical structure is embedded in the dielectric layer. The constructed sensor generates two harmonic peaks under excitation of vertical incidence terahertz waves, the two harmonic peaks are respectively located at 3.44 THz and 3.51 THz, and the highest quality factor Q value reaches 3096. According to the invention, a disc structure with unequal opening angles on the left and right sides is innovatively constructed, quasi-BIC resonance is realized, and the quasi-BIC resonator has the advantages of high refractive index sensitivity, good linearity, simple structure, easy processing and the like.

The invention relates to a reconfigurable reflection wide beam generation metasurface design method for enhancing indoor signal coverage, and belongs to the technical field of artificial electromagnetism, and the method comprises the following steps: designing a reflection metasurface unit which can correspond to different phase responses by changing the capacitance value of an adjustable capacitor; the value of the adjustable capacitor is selected to regulate and control the phase, and 1-bit phase quantization is realized; estimating the scale of the metasurface reflective array and the distance between the feed source and the center of the metasurface reflective array; a phase distribution diagram is calculated according to the phase compensation principle, the compensation phase of each unit in the metasurface reflection array and the corresponding capacitance value are searched from the phase distribution diagram, the units are arranged into a square reflection array, and after a feed source signal is added, the reflection array can generate an emergent wave beam with a preset angle; by changing the rotation angle of the capacitor moving plate, different phase responses to the unit are realized, and the array phase of the preset angle is compensated, so that reconfigurable beam generation can be realized under incident waves.

To provide a technology to improve a hydrogen occlusion time (response speed) while suppressing a cost in a hydrogen detection element.SOLUTION: A hydrogen detection element of the present invention is an electromagnetic meta-material obtained by periodically arranging meta structures composed of a hydrogen occlusion metal film and having a predetermined shape and size on a substrate at a predetermined pitch having 1,000 nm or less and controls a reflection, transmission or absorption spectrum of incident electromagnetic wave. The hydrogen occlusion metal film contains no precious metal and palladium can be used as hydrogen occlusion metal. Further, a spectrum of an incident wave can remove near-infrared light from visible light. Further, the present invention provides a hydrogen detection device including: the hydrogen detection element; a light source unit that can emit incident electromagnetic wave; a light-receiving unit that receives light reflected by or transmitted through the hydrogen detection element; and a detection unit that detects hydrogen on the basis of a light-receiving result of the light-receiving unit.SELECTED DRAWING: Figure 5

The vibration isolation structure comprises a vibration isolation body and vibration isolation layers arranged on the two sides of the vibration isolation body, each vibration isolation layer is of a porous structure, the vibration isolation layers are arranged between the vibration isolation body and surrounding rock, and the thickness of each vibration isolation layer ranges from 5 cm to 10 cm. According to the design, when fluctuation enters the porous structure, pores in the vibration isolation layer can generate multiple scattering and reflection on incident waves, the scattering and reflection processes prolong the propagation path of the fluctuation, increase the interaction time between the fluctuation and the interior of the material, guide the fluctuation energy to be dissipated in the vibration isolation structure, and further reduce the impact on the surrounding environment; by absorbing and dispersing fluctuation energy, the vibration isolation structure remarkably reduces transmission of vibration waves to surrounding buildings, and therefore potential damage to the buildings is reduced.

The invention relates to a method and a system for acquiring dissipated power of a radio frequency device and related equipment. The method comprises the following steps: acquiring respective scattering parameters of all circuit elements in a circuit of the radio frequency device; connecting the respective scattering parameters of all the circuit elements to obtain an overall scattering parameter of the radio frequency device; acquiring an incident wave vector of each circuit element; according to the overall scattering parameter and the incident wave vector of each circuit element, acquiring an emergent power vector corresponding to each circuit element; and constructing a transmission matrix based on the corresponding emergent power vector according to the connection relationship among all the circuit elements, and calculating and obtaining the dissipation power of the radio frequency device through the transmission matrix. According to the method, the dissipation power is obtained by taking the scattering parameters as the data source, so that automatic processing is conveniently realized, and the design efficiency of the radio frequency device is favorably improved.

A spectrometer for detecting an electromagnetic (EM) wave spectrum having one or more wavelength components within a spectral band of interest, a method of detecting an electromagnetic (EM) wave spectrum having one or more wavelength components within a spectral band of interest, and a method of constructing the spectrometer. The method comprises the steps of creating dispersed images of an entrance aperture on a plane of an exit aperture, such that respective images at the different wavelength components are offset by different amounts of displacements along a direction of dispersion; gathering a first EM wave energy incident on the entrance aperture to an EM detector; gathering a second EM wave energy that exits the exit aperture to the at least one single-pixel detector; and measuring the output of the EM detector and the output of the at least one single pixel detector for reconstructing the EM wave spectrum taking into account an intensity distribution of an incident EM wave on the entrance aperture.

The invention relates to the technical field of breakwaters, and discloses a novel floating breakwater provided with tuned liquid mass dampers, which comprises a floating box, a fixing frame is mounted on the outer side of the floating box, a buoyancy plate is arranged at the lower end of the fixing frame, and assembling components are arranged on the left side and the right side of the fixing frame. Mooring assemblies are arranged on the front side and the rear side of the fixing frame, a sealing cover is connected to the upper end of the floating box in a screwed mode, two sets of partition plates are installed in an inner cavity of the floating box, damping chambers are formed between the partition plates and the floating box and between the two partition plates, and damping mechanisms are installed in inner cavities of the damping chambers. The floating breakwater is simple in structure and low in cost, the movement response amplitude of the floating breakwater under the action of waves can be remarkably reduced, the reflection effect on incident waves is improved, meanwhile, radiation waves generated by movement of the floating breakwater are reduced, and therefore the sea area behind the breakwater is better shielded.

A method includes receiving a metasurface design including a plurality of meta-atoms arranged to modify phases of incident waves, the plurality of meta-atoms being from a library of different nominal meta-atoms; generating, by a processing device, a library of manufacturing-aware meta-atoms based on the library of different nominal meta-atoms; and generating instructions for fabricating a manufacturing-aware metasurface having layout computed using a cost function based on the metasurface design and the library of manufacturing-aware meta-atoms.

The invention discloses an improved method for calculating grazing incidence sea surface back scattering through a small slope approximation method, and belongs to the technical field of sea surface electromagnetic scattering calculation, and the method comprises the following steps: S1, determining the wind speed of each stage of sea condition, and calculating the seawater dielectric constant; s2, generating sea surface geometry by using a linear filtering method based on a sea wave spectrum according to the determined wind speed; s3, introducing a conical incident wave; s4, introducing an edge geometric attenuation function; and S5, calculating sea surface back scattering by using an approximate integral formula of a small slope approximation method. According to the improved method for calculating grazing incidence sea surface back scattering through the small-slope approximation method, the edge geometric height is attenuated to 0 by applying the edge geometric attenuation function, so that the situation that the height fluctuation of the sea surface edge is close to an incident wave energy central axis is avoided, the problem that the calculation result is large under grazing incidence is solved, and the calculation efficiency is improved. And meanwhile, the calculation result is more accurate.

The invention belongs to the field of wave energy power generation, and discloses a pilot-frequency floater wave energy device array structure optimization method, which comprises the following steps of: giving an input wave energy spectrum frequency band reconstruction division strategy by combining the technical attributes of a wave energy device; based on an energy obtaining spectrum theory, deducing full-band equivalent energy capture of the device, and clarifying energy obtaining contribution of the device in the array in each band; the input sea wave spectrum is used as the target spectrum, array configuration design is carried out, the matching condition of floaters in the array is determined, the accurate matching of the output level of the array and resources is realized, and the development and utilization efficiency of the array is improved. According to the method, factors such as the mass, the resonance bandwidth, the inherent frequency and applied PTO damping of the floater are comprehensively considered, the relation of influence factors is established, pilot frequency floater wave energy devices meeting the requirements under specific sea area conditions are efficiently found in a simple and rapid means, an array composed of the pilot frequency floater wave energy devices can absorb incident wave energy in a full-band mode, and the wave energy efficiency is improved. And the utilization rate of the wave energy is greatly improved.

The invention relates to the technical field of electromagnetic scattering, in particular to an electromagnetic scattering characteristic prediction method and device, equipment and a storage medium. The invention discloses an electromagnetic scattering characteristic prediction method, and the method comprises the steps: carrying out the joint construction of a target structure parameter, a material electromagnetic parameter, and an incident wave parameter according to a preset mapping function, so as to obtain a joint output vector; performing simulation processing on the joint output vector according to a simulation method; training a preset incremental network model according to the simulation result and the simulation data set to obtain an updated main network model; acquiring real-time structure scene parameters, and predicting the real-time structure scene parameters according to the updated main network model to obtain electromagnetic scattering characteristics; comprehensive parameters are obtained, multi-source data are fused, a training data set is generated through simulation, an incremental network model is dynamically optimized, conventional recognition and new parameter adaptation are considered, the main network is updated, the electromagnetic scattering characteristics are predicted in real time, efficient support is provided for engineering such as radar detection, and the research and development quality and efficiency are improved.

The invention discloses a spectacle lens with a hexagonal cylindrical microstructure on the surface, and relates to the technical field of optical lenses, and the spectacle lens comprises a lens main body which is divided into a central optical area, a hexagonal cylindrical microstructure distribution area and a peripheral optical area from inside to outside in sequence by taking the geometric center of the lens main body as a circle point, the hexagonal cylindrical surface microstructure is arranged on the surface of the lens main body and comprises a plurality of regular girdle cylindrical surface microstructures and inverse girdle cylindrical surface microstructures which are concentrically arranged, the regular girdle cylindrical surface microstructures and the inverse girdle cylindrical surface microstructures are alternately arranged in the radial direction, and irregular astigmatism generates high-order disturbance on incident wave surfaces of human eyes. The method is mainly suitable for teenagers with fast myopia development, and low-order and high-order aberrations and myopia defocus can be alternately introduced into the peripheral retina view field, so that the effect of preventing and controlling the myopia of the teenagers is improved.

This invention provides a split Hopkinson bar device for achieving single-pulse loading, comprising an incident bar, a transmission bar, an incident wave-catching unit, and a stress wave generating unit. The incident wave-catching unit includes an incident wave-catching sleeve and an absorbing bar. One end of the absorbing bar is spaced apart from the incident bar flange, and the other end is connected to the absorbing bar flange. The incident wave-catching sleeve is fitted around the absorbing bar, with its two ends respectively fitting against the absorbing bar flange and the incident bar flange. The compressive stress wave generated by the stress wave generating unit is reflected by the incident bar flange to form a tensile stress wave. After loading the sample, a portion of the stress wave is reflected back as a compressive wave and absorbed by the incident wave-catching unit. This solves the problem of multiple reflections and interference in traditional Hopkinson bars, achieving pure single-pulse tensile loading. The device is compact, has high energy utilization, and is suitable for testing the dynamic mechanical properties of materials.

The invention relates to a line-to-circular polarization Huygens transmission array, which comprises a plurality of transmission array units arranged according to a square matrix form, each transmission array unit sequentially comprises a first metal layer, a dielectric substrate layer and a second metal layer from top to bottom, the first metal layer is located on the upper surface of the dielectric substrate layer, and the second metal layer is located on the lower surface of the dielectric substrate layer. The second metal layer is located on the lower surface of the dielectric substrate layer; the first metal layer comprises a C-like rectangular ring group arranged along the x direction and a C-like rectangular ring group arranged along the y direction; the second metal layer comprises a C-like rectangular ring group arranged along the x direction and a C-like rectangular ring group arranged along the y direction; the structures and sizes of the C-like rectangular ring groups placed in the x direction are the same, and the structures and sizes of the C-like rectangular ring groups placed in the y direction are the same. Compared with the prior art, the problem that an existing line-to-circular polarization transmission array antenna is low in aperture efficiency is solved, and the antenna has the function of focusing and converting a linear polarization spherical incident wave into a circular polarization plane transmission wave based on phase compensation.