97 results about "Scanning beam" patented technology

A chip package includes a housing, one or more electrical connections coupled to an exterior of the housing, a photonic integrated circuit, and a scanning unit. Both the photonic integrated circuit and the scanning unit are disposed within the housing. The photonic integrated circuit has at least one waveguide designed to guide a beam of light. The scanning unit is designed to laterally scan the beam of light across a focal plane outside of the housing. The scanning unit is aligned with the photonic integrated circuit such that the beam of light is coupled between the photonic integrated circuit and the scanning unit.

The invention provides a real-time estimation method and system for a small-target radar adaptive signal-to-noise ratio. According to the method, a motion model is established based on a historical trajectory of a maneuvering target, and a dynamic position prediction sequence is generated; acquiring a scanning beam pointing angle sequence and a timestamp echo signal intensity sequence; starting multiple rounds of iterative detection for each target position point in the prediction sequence, and shrinking a detection window bidirectionally until the boundary is smaller than the width of a beam half-power point; a signal intensity peak value and background noise intensity in a final iteration window are extracted, a beam irradiation efficiency factor is generated in combination with the spatial matching degree of the scanning beam directional angle sequence and the position prediction sequence, and a signal-to-noise ratio dynamic correction is cooperatively calculated; and weighting and fusing the correction, the signal peak value and the noise intensity, and outputting a final signal-to-noise ratio value of the maneuvering target in real time. According to the invention, the signal-to-noise ratio real-time estimation precision and stability of a small target radar when a high-speed maneuvering target passes through a beam edge are improved.

The invention provides a communication method, device and system, a computer program product and a readable storage medium, and the method can be applied to a communication scene exemplarily. In the method, the terminal device can perform blocking sensing based on the variation of the pose data and the variation of the signal quality data, and reports the sensed whether the terminal device is blocked or not and the blocking sensing type under the blocked condition to the network device. Thus, the network device can perform beam adjustment according to the blocking sensing type reported by the terminal device, such as frequency band or bandwidth adjustment, or determine a small number of candidate scanning beams corresponding to the blocking sensing type to perform selection and switching of available beams. According to the method, the network equipment can quickly determine a small number of accurate candidate scanning beams according to the blocking sensing type, the overhead of full beam scanning is reduced, and beam recovery is quickly realized.

The invention relates to the technical field of spraying control, and discloses a precise spraying control method based on combination of laser scanning and a neural network, and the method comprises the following steps: scanning an environment through a laser radar, dynamically adjusting the scanning harness density based on the real-time speed of equipment, and generating sparse sampling point cloud data; performing compressed sensing reconstruction on the sparse sampling point cloud data, inputting the reconstructed three-dimensional point cloud into a neural network model for target positioning, and outputting a three-dimensional coordinate of a target; calculating a spraying error of the current position of the equipment according to the three-dimensional coordinates; the invention further discloses a precise spraying control device based on combination of laser scanning and the neural network. The precise spraying control device comprises a laser scanning module, a data processing module, a control calculation module, an execution mechanism module and a feedback closed loop module. Through laser radar linkage regulation and control, neural network dynamic allocation and fractional order control, spraying precision improvement, response acceleration and resource optimization are realized.

The invention belongs to the technical field of radio metering detection, and particularly discloses a time difference and angle measurement method and device for a microwave navigation landing system and a medium, and the method comprises the steps: responding to a received barker code, obtaining reference time, and carrying out the time synchronization; obtaining a scanning pulse according to the scanning interval and the back-scanning interval; analyzing and extracting the A / D sampling signal according to the scanning pulse to obtain a forward scanning beam and a backward scanning beam in the scanning pulse; obtaining a scanning time difference according to the forward scanning beam and the backward scanning beam; according to the scanned time difference, analysis is carried out based on non-constant clock counting, and a time difference signal is obtained; obtaining MLS angle data based on preset space angle position coding data according to the time difference signal; the invention aims to solve the problems of weak anti-interference acting force and low angle guiding precision of a microwave navigation landing system in the prior art.

The present disclosure provides a laser scanning device and a projection imaging device, which realizes real-time compensation of the outgoing direction of the scanning beam by adding a hardware level distortion correction component and its control module after the reflection of the galvanometer. In the nonlinear distortion area such as the pillow-shaped distortion and the tilt distortion generated by the galvanometer scanning, the distortion correction component can accurately adjust the beam deflection angle according to the pre-calibrated correction parameter sequence, effectively restore the geometric shape of the scanning pattern, significantly improve the linearity of the point cloud distribution and the overall imaging accuracy, and complete the distortion correction of the full field of view without sacrificing the field of view angle or the resolution, thereby ensuring a wider effective imaging area and more delicate image details. By integrating a special distortion correction component in the optical path, the dependence on the upper image processing algorithm is reduced, the demand for high-performance controllers and complex software operations of the entire system is reduced, and better cost effectiveness and engineering implementation are achieved.

The embodiment of the invention provides a laser scanning method and device, laser communication equipment and a laser communication system. The laser scanning method comprises the steps that a pointing center point where a target object is located is determined according to ephemeris information of the target object; the rotation angles of a plurality of array elements in the transceiving array are controlled, so that light beams emitted by the array elements are subjected to incoherent superposition to form scanning light spots, and the light beams emitted by the array elements are obtained through deflection of incident light of the transceiving array; scanning in a preset range pointing to the center point by adopting the scanning light spot, and controlling the rotation angles of a plurality of array elements in the transceiving array to enable light beams emitted by the plurality of array elements to be coherently superposed to form a scanning light beam under the condition that the first position of the target object is scanned; and scanning the first position with the scanning beam to capture the target object. The non-coherently stacked scanning light spots are firstly used for coarse positioning, and then the coherently stacked scanning light beams are used for fine positioning, so that efficient, rapid and accurate capturing of the rapidly moving target is realized.

The invention belongs to the technical field of medical equipment. According to the dynamic target control method and system based on dual-band OCT cooperative imaging, a dual-band OCT cooperative scanning strategy is adopted, a patient is assisted in watching through a built-in fixation target during near-infrared preview, and fixation target parameters are recorded; a scanning target spot is generated during visible light preview adjustment, the position of the scanning target spot is adjusted through fixation target parameters, the exposure time of a patient under visible light is shortened, the dazzling feeling is reduced, and the comfort level of the patient is improved; in the formal scanning stage, the scanning light beam generates a dynamic scanning target spot and periodically stays at a fixed position to guide a patient to watch, the problem that visible light shields a built-in target is solved, and eyeball movement artifacts are effectively reduced.

This invention discloses a three-element leaky wave antenna array structure based on a dielectric ridge parallel plate waveguide, comprising: S1, designing a three-element array structure based on the coupling characteristics of the dielectric ridge parallel plate waveguide, wherein the two-port array antenna is fed by probes in parallel; S2, determining the slot design of the three elements according to the pattern product theorem and the relationship between slot size and leakage, thereby designing a scanning beam that meets the requirements of narrow beamwidth and high gain. This invention is a leaky wave antenna array structure with narrow beamwidth and high gain characteristics proposed to meet the requirements of high signal strength and strong anti-interference in long-distance point-to-point communication systems. This antenna can provide better directivity and higher communication quality, while ensuring that the antenna has the advantages of compact structure and small size, thus it can be applied to wireless power transmission systems such as satellite communication systems, radar systems, and the Internet of Things.

A laser scanning device of an UAV-borne LiDAR for water depth measurement, LiDAR, and an UAV are provided. In the laser scanning device, through synchronous driving of two motors, when the incident laser beam completes a 360° light spot scanning process by the rotation of a light-plane reflecting rotating mirror, and a scanning beam is in position ranges of 0°-X° and (360-X)°-360°, a photodetector protection assembly just rotates to an area with a light attenuation value of 0, or an occlusion-free area. Light echoes generated by the scanning beams in the ranges enter a photodetector without attenuation, while the scanning beam in the range of X°-(360-X°) is occluded by a notched circular shield, and stray light generated by the occlusion cannot enter the photodetector due to attenuation of a circular light attenuation sheet or occlusion of an unnotched part of the circular blocking sheet.

This invention discloses a radar scanning device and method based on cascaded dual-phase plates. The device includes: a laser generator, a first phase plate, and a second phase plate; the light output end of the laser generator is aligned with the first phase plate, and the laser generator is used to generate an initial light signal; the first phase plate has a first phase distribution etched on its side away from the laser generator, and the first phase plate is used to perform a first-level modulation processing on the received initial light signal to obtain a first light signal; the second phase plate has a second phase distribution etched on its side facing the first phase plate, and the second phase plate is used to perform a second-level modulation processing on the received first light signal to obtain a two-dimensional grating scanning beam; wherein, the first phase distribution and the second phase distribution are designed to generate a corresponding two-dimensional grating scanning beam based on the phase difference between them, thereby enhancing the flexibility and stability of the lidar scanning system.

The invention provides a near-field feed low-complexity reconfigurable antenna system, which belongs to the technical field of millimeter wave communication antennas and comprises a 1-bit phased array, a waveguide feed horn array and an air gap between the 1-bit phased array and the waveguide feed horn array. The 1-bit unit is composed of two magnetoelectric dipoles, and two diodes are integrated in the receiving unit to achieve 1-bit phase control. According to the 1-bit reconfigurable magnetoelectric dipole phased array disclosed by the invention, one horn mouth surface is used as a near-field feed source of the 2 * 2 magnetoelectric dipole sub-array, so that not only is the uniformity of aperture irradiation ensured through near-field coupling, but also the number of required phase shifters is reduced, and the excitation of the 1-bit reconfigurable magnetoelectric dipole phased array is conveniently realized. The waveguide phase shifter is directly integrated in the horn array antenna, by means of the working phase range wide enough, the phase shifter can effectively achieve phase distribution needed by array near-field feed, and mirror lobes in scanning beams are successfully suppressed. The reconfigurable array antenna is high in aperture efficiency, low in profile and simple in structure, and has the broadband scanning capability.

The present application discloses an electron particle beam imaging device and a wafer defect detection method. The electron particle beam imaging device includes an emitting unit, a first converging unit, a second converging unit and two deflection units. The emitting unit is used to emit a particle beam. The first converging unit is arranged downstream of the emitting unit, and the first converging unit is used to converge the particle beam to form a converged beam. The second converging unit is arranged downstream of the first converging unit, and is used to form the converged beam into a fine beam spot. The two deflection units are sequentially arranged downstream of the first converging unit, and each deflection unit is used to change the direction of particle movement. Each deflection unit includes a first deflector responsive to a first excitation source and a second deflector responsive to a second excitation source. The first excitation source and the second excitation source are turned on in opposite states, so that the converged beam emitted by the first converging unit passes through the action of the two first deflectors or the two second deflectors to obtain a scanning beam inclined relative to the surface of the sample to be tested.

The invention relates to a miniature stress detector, which comprises a light emitting assembly, a detection head and a light receiving assembly, and is characterized in that the light emitting assembly is used for providing a scanning light beam for the detection head; the detection head is used for scanning the surface of the to-be-detected target after receiving the scanning light beam and generating a polar Kerr effect on the surface of the to-be-detected target; and the optical receiving assembly is used for receiving an optical signal fed back by the detection head under the polar Kerr effect and converting the optical signal into stress in the target to be detected. A stress detection method is provided. According to the invention, a light system is constructed by combining the light emitting assembly and the light receiving assembly, so that the detection head can detect the stress in a to-be-detected target by using the polar Kerr effect, the explosion risk is eliminated by using a non-electromagnetic sensing technology, the lift-off effect is overcome by using optical locality measurement, the size of the probe is reduced, and the detection precision is improved. An intrinsically safe and high-precision technical means is provided for rapid stress state scanning in a high-risk environment, and the safety of high-value targets in key industrial fields such as electric power, petrochemical engineering and aerospace is guaranteed.

The invention relates to a co-frequency co-polarization full-duplex common-aperture planar multi-beam antenna unit and a phased array thereof. The antenna unit is sequentially provided with a first metal layer, a first dielectric substrate, a metal supporting layer, a second metal layer, a second dielectric substrate, a third metal layer, a bonding layer dielectric substrate, a fourth metal layer, a third dielectric substrate, a fifth metal layer and a connector fixing metal layer from top to bottom; the metalized shielding hole, the first feed metal through hole and the second feed metal through hole are respectively connected with the second metal layer, the third metal layer, the fourth metal layer and the fifth metal layer; the antenna units are sequentially arranged along the transverse axis and the longitudinal axis to form subarrays of 5 * 5 antenna units, the four subarrays are sequentially and rotationally arranged to form a phased array of 2 * 2 subarrays, a phased array of a circularly polarized planar antenna unit with the scale of 10 * 10 antenna units is formed, and the phased array has the same-frequency same-polarization full-duplex independent two-dimensional beam scanning capacity.

This invention provides an ophthalmic optical device that eliminates the need to place a separate lens attachment between the objective lens and the eye under examination by changing the working distance between the objective lens and the eye under examination when observing the posterior segment and when observing the anterior segment. [Solution] In the ophthalmic optical device, when photographing the posterior segment of the eye under examination, a position conjugate to the vertical scanning unit is formed in the anterior segment of the eye under examination, and the scanning beam from the vertical scanning unit is focused on the posterior segment of the eye under examination. When photographing the anterior segment of the eye under examination, the working distance, which is the distance between the eye under examination and the objective lens, is greater than the working distance when photographing the posterior segment, and the scanning beam from the vertical scanning unit is focused on the anterior segment of the eye under examination. The scanning direction of the scanning beam by the vertical scanning unit is the same when photographing the posterior segment and when photographing the anterior segment.

To provide an antenna device that allows for easy selection of the optimal interface layer. [Solution] The interface layer selection method includes an antenna provided on a windowpane and capable of scanning beam angles, an interface layer provided on the windowpane, and a control unit, and is a method for selecting the interface layer of a wireless communication device provided on a window having the windowpane, wherein the control unit scans the beam angle of the antenna to obtain a first angular distribution of the received power of radio waves arriving from a base station with respect to the beam angle, estimates the incident angle of the radio waves based on the first angular distribution, and selects an interface layer according to the estimated result of the incident angle.

The invention discloses an electron beam welding method for repairing a hole defect on the surface of a finish machining part and the part, and belongs to the technical field of electron beam welding.The method comprises the steps that a drill bit with the diameter capable of enveloping the size of the hole defect in the part to be repaired is selected, and a drill hole is machined in the position of the hole defect; controlling the diameter and depth of the drilled hole; a filling body with the diameter equal to that of the drill hole and the length larger than the depth of the drill hole is machined or cut out, and the filling body is stuffed into the drill hole; corresponding electron beam welding parameters are selected, so that the welding penetration depth reaches the drilling depth; a circular scanning beam is adopted, electron beam welding is conducted on the filling body, the beam value during welding is gradually increased to the preset maximum value from the zero value and then gradually decreased to the zero value, and an electron beam welding seam is formed; and processing to remove excess weld metal on the surface of the part and weld beading on the back surface. In the repair welding process, the heat input amount is small, the welding time is short, the deformation problem of parts caused by repair welding can be effectively reduced, it is guaranteed that the parts are delivered in a qualified mode, and good applicability is achieved.

The application discloses a target radar cross section estimation method and system, and relates to the technical field of radio and radar detection; the method comprises the following steps: forming a main scanning beam, a left accompanying beam and a right accompanying beam in a residence period, collecting echo samples to obtain an echo sample set, recording a beam serial number and a pointing angle to obtain a multi-beam pointing table, and obtaining a multi-beam power group from the echo intensity of three beams; obtaining a direction map deviation segment from the multi-beam power group and the multi-beam pointing table; aligning the direction map deviation segment with the echo sample set, and obtaining a channel consistency correction table according to a background echo segment; obtaining a de-drift echo power sequence and a maneuvering decoupling weight according to the channel consistency correction table and a tracking error sequence; the application can effectively solve the problems of the mixing of sidelobe energy caused by the beam pointing error in the prior art and the asymmetric drift of the radar cross section estimation caused by the change of the beam shape with the pointing.

A laser scanning system includes an emitting device, a transmitting device, a first rotating mirror device, an optical path shaping device, a second rotating mirror device, and a receiving device. The optical path shaping device can directly reflect a first beam propagating on the same horizontal plane into multiple third beam surfaces propagating in different horizontal planes. The key to this application is that, through the combined action of the first rotating mirror device and the optical path shaping device, the single probe beam emitted by the emitting device is converted into multiple third scanning beams propagating in different horizontal planes, completely replacing the function of the galvanometer device in the prior art. Therefore, the laser scanning system can achieve surface scanning without a galvanometer motor, eliminating the limitations imposed by the galvanometer motor on the stability and lifespan of the entire laser scanning system. This significantly improves the stability and lifespan of the laser scanning system of this invention. It also reduces the regularity of the galvanometer's accelerated oscillation damage, resulting in a more uniform point cloud map.

The present disclosure relates to the technical field of meteorological detection, and particularly relates to a method and device for monitoring deviation of scanning beam of phased array weather radar. The method comprises: receiving radar scanning data and identifying whether it is valid precipitation echo; if yes, adjusting the azimuth angle of the radar to a first position according to the radar scanning data; at the first position, adjusting the elevation angle of the antenna to at least two preset angles, and adjusting the deflection angle of the antenna at each preset angle, so that the area scanned by the deflection angle of the antenna at one preset angle and the area scanned by the normal direction of the antenna at another preset angle overlap; receiving observation data after adjusting the elevation angle of the antenna and the deflection angle of the antenna; and determining whether to calibrate the radar according to the observation data and a preset threshold. The above technical solution solves the problem that there is no effective method to determine when to calibrate the phased array weather radar in the prior art.

A system and method for applying a laser pattern using machine vision positioning and alignment of a wafer is provided. A laser annealing machine configured to apply laser annealing to a workpiece may be configured to provide visual positioning and alignment of the workpiece for applying laser annealing. Providing visual positioning and alignment of a workpiece includes acquiring visual data representing the workpiece via at least one visual sensing device, identifying one or more features in the workpiece or identifying one or more regions in the workpiece based on the acquired visual data to ensure that the workpiece is centered and aligned when a scanning beam is applied to the workpiece. The identifying includes adjusting an operation of the at least one processing component.

The application discloses a kind of electric control fixed frequency beamforming scanning leaky-wave antenna hybrid encoding method, applied to electronic and communication technology field, wherein including: S1, in the case of beamforming scanning, first to determine the relationship and size between beam angle and field intensity along straight path, then according to the secant relationship criterion, the electric field intensity of different positions or angles can be obtained;S2, according to the electric field intensity distribution, the diode encoding state of beam in a certain direction is determined by using hybrid encoding method, so as to design the beamforming scanning beam along the line to meet the requirements of shaping, and the shaping scanning is realized.The present application is the shaping scanning technology proposed for the demand of smooth coverage of electric wave in limited space, can make the radiation field intensity meet the secant square relationship at each position when antenna beam scanning, so as to make the electric field on the horizontal line basically constant.

The invention discloses a technological parameter optimization method capable of improving EBSM metallurgy quality, and belongs to the technical field of electron beam selective melting forming. The method comprises the following steps: acquiring original process parameters of a printing test block, and constructing an initial multi-section process parameter control function according to the original process parameters; determining a target control coefficient and a target segmentation threshold value of the initial multi-segment process parameter control function by adopting a two-factor orthogonal method to obtain a target multi-segment adaptive parameter control function; and controlling the EBSM metallurgical process on the basis of the target multi-section adaptive parameter control function so as to improve the EBSM metallurgical quality. According to the method, the scanning speed in the original process parameters is increased or the scanning beam in the original process parameters is reduced at different scanning positions, so that the conditions of fusion defects and edge buckling deformation are avoided, and technical support is provided for improving the reliability of electron beam selective melting forming components.

Aspects of the present disclosure describe systems and methods for eye-tracking by steering a scan beam in a two-dimensional pattern over a scan region on the eye and detecting light reflected from a plurality of reflection points in the scan region at an angle-sensitive detector. The three-dimensional location of each reflection point is determined by triangulating the instantaneous propagation directions of the scan beam and the reflected signal from that reflection point. Gaze direction for the eye is determined from the locations of the reflection points in three-dimensional space.

The invention discloses a broadband high-gain conformal end-direction scanning array antenna based on oblique units, and mainly solves the problem that conformal, broadband, high-gain and end-direction two-dimensional scanning cannot be considered in the prior art. The antenna comprises a plurality of basic units selecting low-profile broadband oblique antennas, each basic unit comprises an upper dielectric substrate (1), a lower dielectric substrate (2), an upper metal bottom plate (4), a lower metal bottom plate (5) and a coaxial probe (6), and the upper surface of the upper dielectric substrate is printed with a plurality of radiation units (3) and rectangular metal strips (7) which have the same structure and characteristics; each radiation unit comprises two circular radiation patches, and the connecting line of the circle centers of the two circular radiation patches is parallel to the rectangular metal strip. The radiation units are arranged on the curved surface conformal carrier in a coplanar mode according to a set mode so as to form a broadband high-gain two-dimensional scanning wave beam along the end direction of the conformal carrier through adjustment of an excitation phase. The antenna is small in size and low in profile, can improve the end radiation gain and broadband characteristics, guarantees the two-dimensional scanning function of the array, and can be used at the front end of an aircraft to improve the detection performance of the aircraft.

A scanning imaging system has a scanning component that receives light from a light source and generates a scanning beam that is directed by an optical system to a sample to be imaged. A camera captures light returned from the sample to construct an image. Reflections on a target lens within the optical system are prevented by one or more light blocks. A first light block that is imaged onto the target lens is positioned in the optical path from the light source to the scanning component to generate a first moving dark area on the target lens through which the scanning beam from the scanning component to the sample cannot pass. A second light block that is also imaged onto the target lens is positioned in the optical path from the sample to the collector to generate a second moving dark area on the target lens through which the light returned from the sample cannot pass. The moving dark area keeps the scanning beam separated from the return light on the target lens.

The application discloses a kind of based on local fine scanning and power complement millimeter wave array two-dimensional DOA estimation method and system, method includes: using first beam set to carry out coarse scanning to full angle domain, determine the region of interest where target is located;In azimuth dimension, only local high-resolution fine scanning is carried out to the region of interest, keep full angle domain scanning in elevation dimension, obtain local fine scanning power observation;Power complement is carried out to azimuth angle region that is not scanned, and complete power observation vector is constructed;Least square method is used to reconstruct array element domain covariance matrix;Eigenvalue decomposition is carried out to reconstructed covariance matrix, extract noise subspace, and the two-dimensional arrival angle of signal source is estimated.The application is under single radio frequency chain analog beamforming architecture, through azimuth local scanning and power complement, scanning beam quantity is greatly reduced, while maintaining close to global fine scanning super-resolution DOA estimation precision, applicable to mobile scene low overhead, high-precision direction of arrival estimation.

Embodiments of the present application provide a laser scanning method and device, laser communication equipment and laser communication system, comprising: determining a pointing center point where a target object is located according to ephemeris information of the target object; controlling rotation angles of a plurality of array elements in a transceiving array to make light beams emitted by the plurality of array elements incoherently superimposed to form a scanning spot, wherein the light beams emitted by the plurality of array elements are obtained by deflection of incident light of the transceiving array; and using the scanning spot to scan within a preset range around the pointing center point, and in a case where a first position of the target object is scanned, controlling the rotation angles of the plurality of array elements in the transceiving array to make the light beams emitted by the plurality of array elements coherently superimposed to form a scanning beam; and using the scanning beam to scan the first position to capture the target object. Through first coarse positioning using the incoherently superimposed scanning spot and then fine positioning using the coherently superimposed scanning beam, efficient, fast and accurate capture of a fast-moving target is achieved.

The invention provides a target detection method, device and equipment and a readable storage medium. The method is applied to a sensing sending node, and comprises the following steps: obtaining at least one piece of scanning beam list information, the beam scanning beam list information being used for indicating a plurality of scanning beam resources and / or a scanning time sequence of the plurality of scanning beam resources, and the plurality of scanning beam resources being used for determining position information of a target object; and sending the scanning beam according to the scanning beam list information. Through the scheme, the duration of the beam scanning period can be reduced.