129 results about "Normal waves" patented technology

The invention discloses a method for detecting radiation characteristics of a to-be-detected target in a shallow sea waveguide environment, which comprises the following steps of: 1, extracting real normal wave modal parameters of a sound source radiation signal in the shallow sea waveguide environment through an orthogonal constraint modal search method according to data received by a vertical array; 2, according to the real normal wave modal parameters, through a normal wave expression in a waveguide environment, performing inversion to obtain a sound field of the whole shallow sea waveguide; and step 3, acquiring sound field information required in the sound field of the shallow sea waveguide, mapping the sound source information into the free space by using the reciprocity theorem, realizing sound field migration from the shallow sea waveguide to the free space, and further acquiring the radiation characteristics of the target to be measured in the free space. The method is used for obtaining the radiation characteristics of the to-be-measured target in the free space according to the data received by the vertical array.

The invention provides a lens optical fiber array coupling system and a chromaticity measurement system and method, and belongs to the field of chromaticity measurement, and the lens optical fiber array coupling system comprises an imaging lens which is used for obtaining incident light of an object to be measured and guiding the incident light to an array optical fiber; the end face of the array optical fiber is located on the first image plane of the imaging lens, the normal of at least part of the optical fiber end face in the array optical fiber has a deflection angle relative to the normal of the first image plane, and the deflection angle is angle deflection performed by taking the main light ray of the light received by the corresponding optical fiber position as a target reference; and the imaging spectrometer is used for receiving the light information sent by the array optical fiber. By setting the deflection angle of the array optical fiber, the effective receiving area of the optical fiber is maximized, and the change of the transmission efficiency of light of different wavebands is avoided.

A light illumination and collection device (100; 200) for a micro-fluidic system comprises: a flow channel (110; 210) configured to extend in a first plane and allow flow of a sample through the flow channel (110; 210), a light source (120; 220) configured to transmit illumination light along an optical axis extending through a cross-sectional plane of the flow channel (110; 210) for causing light interaction between the illumination light and the sample to form sample information carrying light; a light collecting waveguide (130; 230) configured to extend in a second plane parallel to the first plane, wherein the light collecting waveguide comprises a light inlet (132; 232) configured to receive the sample information carrying light, wherein the light inlet (132; 232) and the light collecting waveguide (130; 232) are rotated in relation to a projection of a normal of the cross-sectional plane onto the second plane.

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.

An antenna substrate includes a substrate including a first main surface and a second main surface, and a coil including a first portion supported on the first main surface, and a second portion supported on the second main surface. A communicating portion is formed in the substrate. The communicating portion communicates the first main surface with the second main surface. The first portion and the second portion are electrically connected to each other, through the communicating portion. A winding direction of the first portion and a winding direction of the second portion are identical, when viewed from a direction along a normal line of the first main surface or a normal line of the second main surface.

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.

The invention relates to a drilling transient antenna assembly inspection method and system, belongs to the technical field of geophysical exploration, and solves the technical problem that after a drilling transient electromagnetic instrument is assembled, a wiring is packaged in a pipe body, and the correctness of the wiring cannot be directly observed and inspected, so that the potential quality hazard of a product is caused. According to the technical scheme, low-resistance anomalous bodies such as metal bodies are sequentially placed at preset positions in the positive direction of the normal of a receiving coil, an instrument is operated to enable a transmitting coil to transmit electromagnetic waves, the receiving coil collects original signals of a secondary field, wiring correctness is judged according to signal polarity, and a signal positive value indicates that wiring is correct. The technical effects are that wiring can be accurately checked through physical experiments and data analysis without dismounting an instrument, assembling quality is guaranteed, checking efficiency is improved, and detection data abnormity is avoided.

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 application relates to a SAR image ocean internal wave stripe segmentation method, equipment and a storage medium, the method comprises the following steps: step S1, acquiring an ocean internal wave SAR image, and performing feature extraction on the ocean internal wave SAR image by adopting Gabor transformation to obtain a feature image; step S2, stripe segmentation is performed on the feature image by using a K-means clustering algorithm, the bright / dark stripes in the ocean internal wave are separated from the background, and the regions where the dark / bright stripes are located are automatically judged according to the inter-class difference; step S3, a minimum circumscribed rectangle of the bright / dark stripe contour is constructed, and the dark / bright stripe position is obtained by translating a set distance along the normal direction of the long side of the minimum circumscribed rectangle. Compared with the prior art, the method has better bright / dark stripe segmentation effect on the SAR image with strong ocean internal wave characteristics, can better identify the bright or dark stripe features with large differences from the background, and has the advantages of strong robustness and high accuracy.

The invention relates to a partitioned quarter-wave plate and a design method thereof. The partitioned quarter-wave plate comprises a central through hole and a plurality of polarized light conversion groups surrounding the central through hole, and the design method comprises the following steps: determining a Jones matrix corresponding to a fast axis angle of a conversion region and a Jones vector of an illumination beam according to the fast axis angle of the conversion region, and calculating to obtain a vector of the illumination beam after passing through the conversion region; and making the component of the vector of the illumination beam passing through the conversion area not equal to 0 in the direction perpendicular to the normal and the component equal to 0 in the normal direction, and calculating to obtain the rotating angle of the fast axis relative to the polarization direction. Compared with the prior art, due to the central through hole, a 0-level light beam of circularly polarized light can be still circularly polarized light; + / -1-level light beams of the circularly polarized light penetrate through two conversion areas of the polarized light conversion group to be modulated into s-line polarized light, and the polarization direction of the illumination light beam group is regulated and controlled.

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.

The present disclosure provides an optical module, comprising: a light emitting part, comprising an emitting housing, wherein a connecting through hole is embedded in the emitting housing, a laser assembly is arranged in the emitting housing, a first optical fiber fixing seat is located in the emitting housing, and a light exit end face of the laser assembly is close to a light incidence surface of the first optical fiber fixing seat. The laser assembly comprises: a second substrate, arranged in the emitting housing and located on the edge of a circuit board, the second substrate being electrically connected to the circuit board; and a laser chip, arranged on the second substrate and electrically connected to the second substrate, a plurality of modulation waveguides being formed side by side at a light exit end of the laser chip to output a plurality of light signals, each modulation waveguide comprising a deflection part, the included angle between the central axis of the deflection part and the normal line of the light exit end face of the laser chip being a first preset angle, and the first preset angle being not 0°. The deflection parts can prevent reflected light signals from being transmitted back to the modulation waveguides, thereby reducing the interference of the reflected light signals on optical signals generated in the modulation waveguides, and ensuring the quality of optical signals generated by the laser chip.

An antenna module (100) is provided with a dielectric substrate (130), a flat-plate-shaped radiating element (121), ground electrodes (GND1, GND2), and power supply wires (141, 142). The ground electrode (GND1) is disposed at a position facing the radiating element in a plan view of the dielectric substrate from the normal direction. A power supply wiring (141) is disposed along a first direction from the ground electrode (GND1) toward the radiating element, and transmits a high-frequency signal to a power supply point (SP1) of the radiating element. The power supply wiring (142) is separated from the power supply wiring (141), is arranged along the first direction, and transmits a high-frequency signal to a power supply point (SP2) of the radiating element. The ground electrode (GND2) protrudes from the ground electrode (GND1), and at least a portion of the ground electrode (GND2) is disposed along the power supply wiring (141). The feeding points (SP1, SP2) are shifted in different directions from the center of the radiating element. The ground electrode (GND2) is disposed so as to be separated from the power supply wiring (141) in a direction from the power supply wiring (142) toward the power supply wiring (141). At least a portion of the ground electrode (GND2) is disposed along the radiating element. The size in the second direction of the portion of the ground electrode (GND2) connected to the ground electrode (GND1) is smaller than the size in the first direction of the ground electrode (GND2).

To provide a room mirror device that can properly sense biological information on an occupant in a vehicle.SOLUTION: A room mirror device for a vehicle comprises: a housing; a mirror having a mirror surface in a long shape provided on a surface of the housing 1; and a radar part, arranged in the housing, which emits an electromagnetic wave toward a vehicle interior of the vehicle and receives a reflected wave reflected by an object of the electromagnetic wave to output a received result of the reflected wave, where a center line passing on a center in an emission range of electromagnetic wave is inclined by a predetermined angle around an axis along a transverse direction of the mirror surface with respect to a normal line of the mirror surface.SELECTED DRAWING: Figure 4

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 invention relates to a method and a device for determining a spatial pose of a non-spherical object (110) comprising at least one surface portion (111) having a known shape. The method comprises the following steps: a) radiating at least two light fields (100) onto the object (110) through a lens (70), each light field (100) having a known phase wavefront (104); the phase wavefronts (104) of the at least two light fields (100) differ from each other at least downstream of the lens (70); the curvature of the phase wavefront (104) at the exit window of the lens (70) is smaller in at least one spatial direction than the minimum curvature of the surface portion (111) of the object (110); for at least one of the light fields (100) there is at least one line located in the surface portion (111) along which at least two local surface normals (112) of the surface portion (111) are orthogonal to a phase wavefront (104) of the at least one of the light fields (100); b) detecting, by means of a detector (80), at least two reflected portions (102) of the light field (100) originating from the object (110); and c) determining the spatial pose of the non-spherical object (110) on the basis of the detected reflected portions (102) of the at least two said light field (100) in view of an expected backscatter signal generated by the surface portion (111) of known shape The method and device preferably enable the determination of the spatial pose of a cylindrical object, in particular glass fiber.

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.

An antenna module includes a dielectric substrate, radiating circuits disposed on the dielectric substrate, a ground electrode, and a dielectric layer. In a plan view in a direction of a normal line of the dielectric substrate, the radiating circuit is disposed adjacent to the radiating circuit. The ground electrode is disposed to face the radiating circuit and the radiating circuit. The dielectric layer is disposed to cover the radiating circuit. The radiating circuit is capable of emitting an electric wave in a frequency band higher than that for the radiating circuit. A dielectric constant of the dielectric layer is higher than a dielectric constant of the dielectric substrate. A distance between the radiating circuit and the ground electrode is shorter than a distance between the radiating circuit and the ground electrode.

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.

A method for determining an angle of arrival at a first communication device having a first antenna and a second antenna aligned along a direction and defining a normal thereto. The method comprises performing a respective signal exchange through each of a plurality of channels between the first communication device and a second communication device, storing a first plurality of in-phase and quadrature (I / Q) samples; estimating channel frequency responses for the first antenna and the second antenna respectively; measuring a respective distance; creating respective standard channel frequency response components corresponding to the respective distances; for each propagation path, selecting a first respective weight and a second respective weight; selecting a weight w1(1) and an other weight w2(1);determining, based on the weight w1(1) and the other weight w2(1), the angle of arrival, relative to the normal, of signals direct from the second communication device.

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).