69 results about "Normal waves" patented technology

An aircraft radome and radar assembly includes: a radome arranged on the nose of the aircraft; a radar inside the radome, the radar operating in the millimeter domain and including a transmission antenna for emitting a TM polarized wave and a reception antenna; the radome includes an integrated window in front of the radar, the window being of a material transparent to millimeter waves; the radar being arranged so the angle between the maximum gain direction of the transmission antenna and the normal to the window is within an angular range [θB−θ1; θB+θ2], with OB being the Brewster angle for an air / window interface, θ1 and θ2 determined to obtain reflectivity at said air / window interface less than a predefined threshold; and an isolation partition between the transmission antenna and the reception antenna, the isolation partition being substantially in contact with the window and with the radar.

The embodiment of the present application provides a grating structure, an optical waveguide device and a display device, and belongs to the technical field of display, the grating structure is arranged on the optical waveguide plate, the light in the optical waveguide plate is incident on the grating structure, the grating structure is used for changing the propagation direction of incident light or coupling out the incident light from the optical waveguide plate, the grating structure comprises: a plurality of sub-gratings arranged along a first direction and different in position;Wherein, the light-out angle range of at least two sub-gratings is different, the light-out angle range is the angle range of the light emitted by the sub-grating, and the angle range is the included angle range between the emitted light and the normal direction of the sub-grating. Through the grating structure, the optical waveguide device and the display device provided by the embodiment of the present application, the light efficiency waste caused by the grating structure can be reduced, and the light efficiency of the optical waveguide device is improved.

The utility model discloses an optical machine module and a near-to-eye display device. A lighting assembly and a lighting and imaging multiplexing assembly of the optical machine module are located on the two sides of a waveguide sheet. Illuminating light emitted by the illuminating assembly is transmitted in the first direction, transmitted through the waveguide sheet, the fly-eye lens, the first polaroid and the lens set in sequence, then incident to the surface, close to one side of the lens set, of the light modulator and modulated into imaging light through the light modulator to be reflected, and the imaging light is transmitted through the lens set and the second polaroid in the second direction and then emitted to the other side of the light modulator. And after total reflection transmission in the waveguide sheet, the light is emitted from the exit pupil area of the waveguide sheet to the human eyes, and the included angles between the first direction and the normal of the light modulator and between the second direction and the normal of the light modulator are the same. According to the optical machine module provided by the utility model, the volume of the optical machine module can be reduced on the premise of ensuring the performance of the optical machine.

This antenna module comprises: a dielectric substrate (130) having a first main surface (11) and a second main surface that face each other; an RF pad (20) disposed on the first main surface (11); a first ground pad (40) disposed on the first main surface (11); and a radiation electrode disposed on the dielectric substrate (130) at a position different from the first main surface (11). The dielectric substrate (130) has a resist layer (140) formed on the first main surface (11). In a plan view of the dielectric substrate (130) from the normal direction, the resist layer (140) is not formed on a straight line connecting one point on the RF pad (20) and one point on the first ground pad (40).

The invention relates to the technical field of ultrasound, in particular to an ultrasonic incident angle correction method, a program product and a self-adaptive transducer. According to the method, an incident wave is emitted to a target object, a reflected wave reflected by the target object is received, and whether the intensity of the reflected wave reaches a preset condition or not is judged; if not, the incident angle is adjusted until the reflected wave reaches the preset condition, the incident angle of the ultrasonic wave can be automatically adjusted in real time, the incident angle is made to be matched with the normal direction of the skull surface, and therefore the problems of sound energy attenuation and efficiency reduction caused by the too large incident angle are avoided; dependence on traditional high-resolution medical imaging equipment is reduced, and a complex and time-consuming individualized customization process is omitted; the skull penetrating efficiency of ultrasonic energy is improved, the output energy and the focusing effect of the whole transcranial focusing ultrasonic system are optimized, and the reliability and effectiveness of a treatment scheme are improved accordingly.

An apodization grating coupler based on a thin film lithium niobate platform comprises a silicon substrate, a buried silicon oxide layer, a thin film lithium niobate layer and a silicon oxide cladding which are sequentially arranged from bottom to top, and an end face coupler, a thin film lithium niobate waveguide, a light beam expander and an apodization grating are sequentially arranged in the thin film lithium niobate layer. The end face coupler couples light of the conical optical fiber into the thin film lithium niobate waveguide, and after the light is input into the apodization grating through the light beam expander, large-beam-waist Gaussian light beams are coupled through diffraction of the apodization grating. On the basis of the large-size apodization grating, through a compact plane photon structure, the 700 nm * 300 nm lithium niobate high-refractive-index single-mode waveguide can be coupled to a near-surface normal Gaussian beam with a beam waist of about 110 m and good collimation, the diffraction angle is 10 degrees, centimeter-level propagation is achieved in a free space, and the loss is 5.6 dB.

An antenna module includes a first dielectric substrate at which a first radiating electrode with a flat plate shape is disposed and a second dielectric substrate at which a second radiating electrode shape is disposed. The first dielectric substrate has a first surface and a second surface that are opposite each other. The first radiating electrode is disposed on the second surface of the first dielectric substrate or at a position between the first and second surfaces of the first dielectric substrate. The second dielectric substrate includes a region that is arranged so as abut the first dielectric substrate and a region that is in contact with the first surface of the dielectric substrate. A normal direction of the radiating electrode is different from a normal direction of the radiating electrode.

The application discloses a building steel structure weld ultrasonic nondestructive testing and flaw detection method and system, belongs to the technical field of weld detection, and the method comprises the following steps: acquiring weld surface laser point cloud data, calculating local normal direction and converting probe inclination; extracting noise amplitude sequence in a non-welding area, and constructing a noise statistics table; driving an ultrasonic array probe to generate a full matrix echo data set and a plane wave echo data set according to a scanning posture table; mapping into a full focus image and a plane wave superposition image, calculating amplitude difference to generate a fusion weight map; generating a fusion image based on the fusion weight map, performing regional segmentation by using the noise statistics table, and extracting a defect boundary coordinate table. The technical scheme of laser point cloud guided probe posture, dual-mode imaging fusion and adaptive noise segmentation can realize high-precision, automatic identification and objective quantitative evaluation of internal defects of a weld.

The invention relates to a water body rendering method and device, equipment, a storage medium and a program product, and the method comprises the steps: superposing periodically continuous waveform data and noise data to all vertexes of a horizontal grid, and obtaining a wave pattern; coloring the wave white mold to obtain a wave model; respectively carrying out derivation processing on the waveform data and the noise data at each vertex in the wave pattern to obtain a first space gradient corresponding to the waveform data and a second space gradient corresponding to the noise data; performing composite processing on the first space gradient and the second space gradient to obtain a composite gradient of each vertex; obtaining a vertex normal vector of each vertex based on the composite gradient of each vertex; based on the vertex normal vector and the line-of-sight direction vector of each vertex, generating edge intensity data of the wave contour; and superposing the edge strength data to the wave model to obtain a water body rendering result. According to the scheme, the vertex normal vector is dynamically determined based on the composite gradient, so that the rendered water body has a dynamic surge effect.

The present invention provides an acoustically transparent display having an angled acoustic waveguide. [Solution] An acoustically transparent display device is provided in the form of a device comprising a display panel, a light source positioned in front of the display panel, and an opening that penetrates the display panel and is positioned between the light sources. To better direct sound from speakers towards the audience, the device further comprises an acoustic waveguide positioned in the rear of the display panel, the acoustic waveguide positioned in part of the opening and angularly offset from the normal to the rear of the display panel, to guide sound received at the rear through the part of the opening at a non-zero angle with respect to the respective normals to the front of the display panel.

An acoustic wave device including an IDT electrode on a piezoelectric film, in which a Z-axis direction of a crystal is different from a direction of a normal to a major surface. An overlap region of the IDT electrode includes a central region and first and second edge regions. First and second dielectric films are stacked between the piezoelectric film and first and second electrode fingers in the first and second edge regions. When an angle between a first side surface of the first dielectric film and a major surface of the piezoelectric film is α1 and an angle between a second side surface of the second dielectric film and the major surface of the piezoelectric film is α2, α1≠α2 between at least one electrode finger of the first and second electrode fingers and the piezoelectric film.

The invention relates to the technical field of microelectronics, in particular to a high-frequency acoustic resonator and a communication device. The high-frequency acoustic resonator comprises a supporting substrate, a bottom electrode, a piezoelectric film and a top electrode which are sequentially arranged in a stacked mode from bottom to top, the top electrode comprises an interdigital transducer, the interdigital transducer at least comprises an interdigital electrode pair and a bus bar, the normal direction of the interdigital electrode pair serves as the first direction, the electrode extending direction of the interdigital electrode pair serves as the second direction, and the bus bar is arranged in the first direction. The normal direction of the surface of the piezoelectric film is a third direction, setting the relative relationship of three volume wave sound velocities of the supporting substrate according to the relative magnitude of kinetic energy corresponding to polarization components of the target mode in three directions, and setting the relationship between the sound velocity of the target mode and the sound velocity of the supporting substrate, therefore, the sound wave in the target mode is restrained on the surface of the supporting substrate, so that a higher Q value and a higher target mode cutoff sound velocity can be realized on the premise that the slow shear wave sound velocity of the supporting substrate is the same, and the photoetching requirement is reduced.

This invention relates to a detector array (1) for detecting electromagnetic radiation, the detector array (1) comprising a plurality of detector elements (2) arranged sequentially along a scan line extending in a first direction (Y), each of the plurality of detector elements (2) having a detector surface (3) for receiving electromagnetic radiation and operable to convert the received electromagnetic radiation into a corresponding detection signal, wherein the surface normals (4, N) of each of the detector surfaces (3) extend in a common plane (S) and converge to a common focal point (5), wherein the common plane (S) extends in the first direction (Y), and for at least two detector elements (2), the distances between the common focal point (5) and the detector surface (3) along the respective surface normals (4, N) are different. Furthermore, this invention relates to a radiographic examination system (20) including the detector array (1).

The invention provides a variable polarization highly-oriented metasurface antenna based on vector vortex wave conversion. The variable polarization highly-oriented metasurface antenna comprises a radiation source used for generating vector vortex waves, a polarization filtering metasurface lens which is parallel to the radiation source, does not make contact with the radiation source and can rotate, and a monopole feed source arranged in the center of the radiation source. The polarization filtering metasurface lens comprises a plurality of polarization filtering lens units which are periodically arranged, each polarization filtering lens unit comprises a phase modulation surface and a polarization selection surface which are parallel and do not make contact with each other, and the polarization selection surface is located on one side of the radiation source; and when the polarization filtering metasurface lens rotates around the central normal of the radiation source, the vector vortex wave is converted into a continuous variable polarization high-orientation wave beam. According to the invention, spatial non-uniform polarization of vector vortex waves is converted into single uniform polarization by the polarization selection surface, so that the communication efficiency is improved; and meanwhile, the phase modulation surface compensates and calibrates the near-field phase of the vector vortex wave, so that high-directionality radiation is realized, and the communication distance is increased.

An antenna module (100) is provided with a dielectric substrate (130), a radiating element (121), a ground electrode (GND), a power supply wiring (140), a path (V1) connected to the radiating element (121), and an auxiliary electrode (150). The dielectric substrate has main surfaces (131, 132) facing each other. The ground electrode is disposed on the dielectric substrate so as to face the radiating element at a position closer to the main surface (132) than the radiating element. The power supply wiring transmits a high-frequency signal to a power supply point (SP1) of the radiating element. The auxiliary electrode is connected to the path, and is disposed between the radiating element and the ground electrode. The feed point is disposed at a position shifted in the first direction from the center of the radiating element. The passage is connected to the radiating element at a position shifted from the center of the radiating element in a second direction opposite to the first direction. The auxiliary electrode protrudes in the second direction from the radiating element in a plan view from the normal direction of the dielectric substrate.

The invention relates to a waveguide antenna (10) for a radar sensor (46), comprising a waveguide substrate (12) having cavity structures (14) for transmitting radar waves within the waveguide antenna (10), an antenna surface (18) facing surroundings (16) of the waveguide antenna (10), at least one emission element (20) for emitting radar waves into the surroundings (16) of the waveguide antenna (10), said radar waves being polarized in a first direction (22) perpendicular to a normal direction (24) of the antenna surface (18), wherein at least regions of the antenna surface (18) comprise polarization means (34) for rotating the polarization of radar waves that were reflected in the surroundings (16) and are incident on the polarization means (34). The invention also relates to a radar sensor (46).

The utility model discloses a sleep-aiding sound box. The sleep-aiding sound box comprises a sound box main body; the angle adjusting seat is arranged on the sound box main body in an angle-adjustable manner; the waveguide tube is arranged at the front end of the angle adjusting seat and protrudes out of the front end of the sound box main body; the loudspeaker is installed at the front end of the angle adjusting seat and located on the rear side of the waveguide tube, an angle a is formed between the central axis normal of the loudspeaker and the tube wall of the waveguide tube, the angle a is larger than 0 degree and smaller than 180 degrees, and sound waves emitted by the loudspeaker can be reflected after meeting the tube wall of the waveguide tube. A user can adjust the propagation direction of reflected sound waves by adjusting the angle of the angle adjusting seat relative to the sound box main body, thereby realizing directional sound production, and enabling a part of sound felt by the user to come from a three-dimensional space outside the sound box main body by means of secondary reflection of a ceiling or a wall or a floor of a room. And a more natural and relaxed atmosphere is created, so that the sound field is wider and natural, the user is more relaxed and joyful, and the sleep aiding effect is improved.

Provided is an acoustically transparent display with a tilted acoustic wave conduit. There is provided an acoustically transparent display device in the form of a device, the device comprising: a display panel; a light source disposed on a front surface of the display panel; and an aperture passing through the display panel, the aperture being disposed between the light sources. In order to better direct sound from a speaker to the viewer, the device is also provided with an acoustic wave conduit arranged on the rear surface of the display panel, the acoustic wave conduit being arranged at a portion of the aperture, the acoustic wave conduit being angularly offset from a normal to the rear surface of the display panel, the sound guide is disposed in the aperture to guide sound received at the rear surface through the portion in the aperture at a non-zero angle with respect to a respective normal to the front surface of the display panel.

The present application relates to a kind of underwater sound source distance estimation based on normal wave phase and multi-task neural network, first in certain geoacoustic parameter range, simulation sound pressure phase is calculated, and simulation data and measured data are normalized;Then the sound pressure phase calculated is used as training data, horizontal distance, seabed bottom quality sound velocity and mode information are used as supervisory signal to train a multi-task model;The model is preliminarily tested using test data to verify the effectiveness of the method;Finally, a small amount of normalized measured complex sound pressure is used to fine-tune the model, and it is tested again on the remaining measured data.The robustness of distance prediction ability is improved;Using transfer learning to alleviate the distribution difference between simulation data and measured data, experiments show that only a small amount of measured data can greatly improve the distance prediction performance of the model.

The invention discloses a layer type floating breakwater with adjustable draft and anti-typhoon functions, which comprises an upper buoyancy tank, a middle adjusting tank and a lower ballast tank, and is characterized in that the ballast tanks capable of being filled and discharged with seawater are arranged in an upper floating body and a lower floating body, and a water inlet valve, a water discharge valve, a sensor and an intelligent control system are arranged. By controlling the weight of seawater in the ballast tank, three core function modes are realized: in a transportation laying mode, the ballast tank is empty, the dead weight of the structure is greatly reduced, and the construction cost and the marine towing cost are remarkably reduced; in a normal wave dissipation mode, the immersion depth can be flexibly adjusted to adapt to different wave conditions, and the wave dissipation performance is optimized; in an anti-typhoon mode, seawater is injected into all the ballast tanks, so that the total weight of the breakwater is larger than the buoyancy of the breakwater, the breakwater controllably sinks and stably sits on the seabed, impact of typhoons and huge waves is fundamentally avoided, and water is drained, floated and reset after the typhoons. According to the invention, economy, high efficiency and active risk avoiding safety are integrated.

FIELD: radar technology.SUBSTANCE: invention relates to passive methods of protecting radar stations (RLS) from homing high-precision weapons (HPW) with a passive homing head (PHH), which include anti-radar missiles (ARM). The radar station and an additional radiation source (ARS) synchronized with it emit coherent signals in the direction of the spatial position of the ARM. These devices represent a source of spatially diverse interference to the passive homing head of a missile. The normal to the phase front of the resulting electromagnetic wave differs from the normal to the phase front of the radar. As a result, the missile's passive homing head is oriented in the direction of the false target, which is different from the direction of the protected radar. The condition for the interference impact is the provision at the input of the receiving antenna of the PGSN of an inversion zone of the total wave front of the resulting signal of the radiation sources with certain amplitude-phase relationships, as well as the provision of a change in the angular velocity of rotation of the missile-target line of sight.EFFECT: increased radar's protection against anti-missile missile attacks by diverting its guidance trajectory to a false point from the protected radar.1 cl, 2 dwg

This invention discloses an intelligent early warning method, system, and medium for abnormal waves based on a three-branch bilinear gated fusion model, belonging to the field of marine engineering safety early warning technology. The method includes the following steps: constructing an original dataset containing normal wave samples and abnormal wave samples; constructing abnormal wave early warning samples based on a preset input time window and early warning period; extracting the first, second, and third feature vectors from a specific wavefront sequence using a three-branch feature extraction network; performing adaptive fusion through a bilinear gated fusion module to obtain the final fused features; inputting the final fused features into a classification and discrimination module, and outputting the probability of abnormal wave occurrence through multi-dimensional comprehensive analysis. This invention addresses the problems of scarce abnormal wave samples and highly imbalanced categories by introducing hybrid training, asymmetric loss, and false alarm suppression strategies to improve the stability and generalization ability of the developed model under real sea conditions.

Aircraft Radome and Radar Assembly The invention relates to an aircraft radome and radar assembly (EAR) comprising: a radome (Rd) disposed on the nose of the aircraft (NA); a radar (Ra), disposed inside the radome (Rd), the radar (Ra) being configured to operate in the millimeter range and comprising a transmitting antenna (Tx) configured to emit a TM polarized wave and a receiving antenna (Rx); the radome (Ra) comprising a window (F) integrated in said radome, the window (F) being in a material transparent to millimeter waves, the window (F) being opposite the radar (Ra); the radar (Ra) being disposed such that the angle (θi) between the maximum gain direction (DGM) of the transmitting antenna (Tx) and the normal (N) to the window (F) is within an angular range [θB - θ1;θB + θ2], with θB being the Brewster angle for an air / window interface, θ1 and θ2 determined to obtain a reflectivity at said air / window interface below a predefined threshold; and an isolation partition (IC) disposed between the transmitting antenna (Tx) and the receiving antenna (Rx), the isolation partition (IC) being substantially in contact with the window (F) and with the radar (Ra). Figure for the abstract: Fig. 1;

The present application belongs to the technical field of phased array radar monopulse and difference angle measurement, and particularly relates to a method for quickly generating angle discrimination curves of a monopulse radar at multiple pointing angles, which comprises the following steps: measuring the azimuth and elevation angle discrimination curves of the normal wave position of a phased array of a monopulse radar in a darkroom environment; scanning the beam pointing according to a designed trajectory, and synchronously rotating the turntable according to a corresponding designed trajectory to measure the difference and ratio data at the designed wave position; characterizing the deformation of the angle discrimination curves caused by the non-ideal factors of the phased array as translation and rotation, and calculating the translation coefficient C and the rotation factor K of the angle discrimination curves at different wave positions compared with the angle discrimination curves at the normal wave position based on the measured difference and ratio data; based on the obtained translation coefficient C and rotation factor K of the wave position, interpolating and predicting the C and K of all wave positions within the required wave position range; and based on the C and K of all wave positions, constructing a lookup table and writing it into the phased array radar to complete the quick generation of the angle discrimination curves of the monopulse radar at multiple pointing angles.

This invention relates to an aircraft radome and radar assembly (EAR), comprising: a radome (Rd) for the nose (NA) of an aircraft; a radar (Ra) within the radome (Rd), the radar (Ra) operating in the millimeter-wave band and including a transmitting antenna (Tx) and a receiving antenna (Rx) configured to transmit TM-polarized waves; the radome (Ra) includes a window (F) made of a millimeter-wave-transmitting material and located in front of the radar (Ra); the radar (Ra) is configured such that the angle (θi) between the maximum gain direction (MGD) of the transmitting antenna (Tx) and the normal (N) of the window (F) is within the angle range [θi]. B -θ1; θ B Within +θ2], θ B The Brewster angle of the air / window interface, θ1 and θ2 are determined to be the reflectivity obtained at the air / window interface below a predetermined threshold; and the isolation partition (CI) between the transmitting antenna (Tx) and the receiving antenna (Rx), the isolation partition (CI) being in contact with the window (F) and the radar (Ra).

The invention discloses a three-dimensional metamaterial unit cell unit and a three-dimensional heterostructure metamaterial. The unit cell unit is of a cubic structure and comprises a body center ball and six groups of connecting rods which are respectively arranged between six surfaces of the cube and the body center ball; each group of connecting rods comprises four curve rods, the first ends of the four curve rods are respectively connected to the surface of the body center ball and are arranged in quadruple rotational symmetry by taking the central normal of the corresponding cubic surface as the axis, and the second ends of the four curve rods are suspended ends and are used for being connected with adjacent unit cell units when the metamaterial is formed. According to the invention, through a space truss type unit cell topological structure of a body center sphere and six groups of four-curve rods, the unit cell generates obvious elastic wave transmission attenuation in a relatively low frequency range; according to the three-dimensional heterostructure metamaterial, the transmission attenuation frequency band of the metamaterial is effectively widened on the premise that the structure size and quality are not remarkably increased through a unit cell design mode that multi-dimensional geometric parameters can be independently adjusted.

The invention discloses a goodness vector calculation method for measuring modal filtering performance of a vertical linear array. The goodness vector calculation method comprises the following steps: (1) initializing marine environment parameters, line spectrum signal parameters emitted by a sound source and vertical receiving array parameters; (2) calculating each order normal wave mode function excited by a line spectrum signal emitted by a sound source and a receiving sound pressure value at each hydrophone depth of a vertical array by using a Kraken model, and establishing an array receiving sound pressure vector; (3) constructing a sampling mode function matrix, multiplying a pseudo-inverse matrix of the sampling mode function matrix by the sampling mode function matrix to obtain a mode filtering matrix, and calculating a relative attenuation coefficient of each order mode; (4) calculating to obtain a contribution degree matrix by using the modal filtering matrix and the relative attenuation coefficient of each order of modal, and taking out main diagonal element values of the contribution degree matrix to form a goodness vector; according to the method, the modal filtering performance can be quantitatively represented, and a quantitative analysis means is provided for measuring the modal filtering performance under the vertical linear array.

The optical module provided by the invention comprises the components of a light emitting component which comprises an emitting housing which is embedded in a connecting through hole; a laser assembly is arranged in the transmitting shell, the first optical fiber fixing base is located in the transmitting shell, and the light-out end face of the laser assembly is close to the light-in face of the first optical fiber fixing base. The laser assembly comprises a second substrate which is arranged in the transmitting shell and located on the edge of the circuit board; the second substrate is electrically connected with the circuit board; the laser chip is arranged on the second substrate and is electrically connected with the second substrate; a plurality of modulation waveguides are formed side by side at the light emitting end of the laser chip to output multiple beams of light signals; the modulation waveguide comprises a deflection part, the included angle between the central axis of the deflection part and the normal of the light emitting end face of the laser chip is a first preset angle, and the first preset angle is not 0 degree. And the deflection part can prevent the reflected optical signal from being transmitted back to the modulation waveguide, so that the interference of the reflected optical signal on the optical signal generated in the modulation waveguide is reduced, and the quality of the optical signal generated by the laser chip is ensured.