442 results about "Concentric ring" patented technology

An aerial vehicle configured for operation within indoor spaces has a meshed construction with a housing defined by upper and lower sections having meshes provided above and below propellers and motors of the aerial vehicle. The aerial vehicle also includes a suite of sensors such as LIDAR sensors, time-of-flight sensors, cameras, ultrasonic sensors, or others. Meshes of the upper and lower sections include central openings along with spokes and concentric rings provided about the central openings. Meshes of the lower section have substantially larger central openings than meshes of the upper section, but feature more dense spokes or concentric rings beneath tips of the rotating propellers, which may be hinged or foldable in nature. Data captured by sensors of the aerial vehicle may be utilized for any purpose, such as to generate environment maps of an indoor space, or to monitor the indoor space for adverse conditions or events.

The invention provides a metasurface structure and method for realizing transverse polarization focusing light splitting, and the metasurface structure comprises a substrate and a surface structure which is disposed on the substrate. The surface structure is composed of a plurality of sub-wavelength structure units which are arranged in a concentric circular ring mode. The sub-wavelength structure unit performs polarization-independent focusing of an incident beam through transmission phase regulation and control, and performs polarization-dependent light splitting of the incident beam through geometric phase regulation and control. The point diffraction plate can realize light beam splitting and focusing functions related to polarization, has the advantages of being simple in structure and high in integration level, solves the technical problems that an existing point diffraction plate does not support synchronous phase-shifting interference measurement and the contrast ratio of interference fringes is low, and enables the contrast ratio of the interference fringes of point diffraction interference measurement to be higher, the resolving precision to be higher and the resolving speed to be higher.

The invention discloses a peripheral visual area out-of-focus imaging system with variable out-of-focus amount. The peripheral visual area out-of-focus imaging system is composed of a zoom reflector and a spectroscope. The zoom reflector is located right above an observed object, and the side, provided with the microstructure array, of the zoom reflector faces the observed object; the spectroscope is positioned between the zoom reflector and an observed object, and is inclined at a certain angle relative to the vertical direction; the surface, provided with the microstructure array, of the zoom reflector comprises two regions, namely a central region S1 and a peripheral edge region S2, the S1 region is composed of a concentric ring microstructure array with the equivalent focal length F1, the S2 region is composed of concentric ring microstructures with the equivalent focal lengths F1 and Fv which are alternately arranged, the centers of concentric rings of the S1 region and the S2 region coincide, and the center of the concentric ring microstructures of the S1 region and the center of the concentric ring microstructures of the Fv region coincide with the center of the concentric ring microstructures of the S2 region. And the microstructure is an edge tooth structure in circular ring distribution. The micro-structure array is adopted, the defocusing amount can be freely controlled through the structure parameters of the micro-structure array capable of being flexibly regulated and controlled, a defocusing image with the variable defocusing amount and uniform brightness is achieved, and therefore the good myopia prevention and control effect is achieved.

The invention discloses a structure three-dimensional displacement monitoring method and device based on a monocular camera and a concentric annulus, and relates to the field of computer vision and structure health monitoring, a concentric annulus target is fixed at a to-be-monitored structure monitoring point, and the monocular camera carries out positioning and lens parameter adjustment; shooting a checkerboard image and calibrating the checkerboard image by adopting a camera calibration algorithm to obtain a distortion parameter and an internal reference matrix; collecting a video sequence containing a structure displacement process of the target; image distortion correction is carried out based on the distortion parameters and the internal reference matrix, a target is identified through a target detection algorithm, and target parameters are calculated through least square circle fitting; realizing multi-target tracking by a target point topology identification algorithm based on Y-X threshold sorting; calculating scale factors according to target parameters and actual physical sizes, and calculating in-plane orthogonal direction displacement and out-of-plane displacement to form three-dimensional displacement information of the structure; according to the invention, the monocular camera is adopted to realize the accurate measurement of the three-dimensional displacement of the structure and reduce the complexity and calibration difficulty of the system.

A concentric circular microphone array (CCMA) may include a number of omnidirectional microphones and an equal number of directional microphones, wherein the omnidirectional microphones and the directional microphones form a plurality of concentric rings on a substantially planar platform. Each of the plurality of concentric rings includes a subset of the omnidirectional microphones and a subset of the directional microphones (e.g., arranged in mixed pairs of microphones). Responsive to a sound source, the omnidirectional microphones and the directional microphones may respectively generate first and second electronic signals. A target beampattern of Nth order may be specified for the CCMA. An Nth order beamformer for the CCMA, that is steerable in a three-dimensional space including the sound source, may be determined based on the specified target beampattern. The beamformer may be executed to calculate an estimate of the sound source based on the first electronic signals and the second electronic signals.

The CSRR-based quarter substrate integrated waveguide sensor comprises a dielectric substrate, a square ring metal layer is arranged on the upper surface of the dielectric substrate, a lower metal layer is arranged on the lower surface of the dielectric substrate, and a row of metal holes are uniformly distributed in the circumferential direction of the square ring metal layer; the upper surface of the dielectric substrate is also provided with four triangular metal patches with different sizes, and each edge of the square ring metal layer is connected with one triangular metal patch; two concentric annular CSRRs are etched on the vertex angle, far away from the square ring metal layer, of the triangular metal patch. The sensor is novel in design, four mutually independent poles are generated, simultaneous multiband operation is realized, efficiency is improved, errors and loss are reduced, the size of the sensor is reduced by about 75% by adopting the QMSIW, and the sensor has the advantages of being small in size, easy to integrate, high in flexibility, low in loss and high in sensitivity.

The invention provides a contact lens with peripheral defocus, and relates to the technical field of optical lenses, the lens comprises a contact optimization core area, a partitioned progressive microprism array area and a dynamic light scattering area, and the specific setting is as follows: the contact optimization core area is located at the geometric center of the lens, the outward extension radius is 1.8-2.2 mm, and the contact optimization core area provides clear central vision; according to the intelligent self-adaptive contact lens, the intelligent self-adaptive contact lens is characterized in that the intelligent self-adaptive contact lens comprises a contact optimization core area and a partition progressive microprism array area, the partition progressive microprism array area is located on the outer side of the contact optimization core area and surrounds the contact optimization core area in a concentric ring shape, and through collaborative design of the partition progressive microprism array area and the dynamic light scattering area, the real-time monitoring and dynamic adjusting capacity of a photoelectric feedback control module is combined; the problem that an optical structure of an existing product lacks dynamic adaptability is effectively solved, and the optical structure can be changed according to different illumination environments and wearing duration.

The invention discloses a torque sensor and an implementation method thereof, the torque sensor comprises a composite elastomer and a sensing strain gauge, the composite elastomer comprises an outer fixing ring, an inner fixing ring, a spoke strain beam and a Y-shaped strain beam, the outer fixing ring and the inner fixing ring are of a concentric ring structure, the spoke strain beam is radially connected with the outer fixing ring and the inner fixing ring, and the Y-shaped strain beam is connected with the outer fixing ring and the inner fixing ring. The Y-shaped strain beams are arranged between the adjacent spoke strain beams, and the sensing strain gauges are printed on the Y-shaped strain beams and are connected to form a Wheatstone bridge. The anti-interference capability of the torque sensor can be improved, and the torque sensor can be widely applied to the technical field of sensors.

The present disclosure relates to apparatuses for producing nanoparticles from a material mixed with a working liquid and optionally to produce hydrogen, and to top-down methods for producing nanoparticles and optionally hydrogen using such apparatuses. A core of such an apparatus comprises a first disc (11) and a second disc (12) including holes (7) arranged in concentric rings (16) and channel portions (18) between those rings. The first disc and the second disc are arranged such that the channels of each disc face the rings of the other disc.

The invention discloses a metallographic sample preparation method and device based on rotating speed grading regulation and control, and belongs to the technical field of metallographic grinding sample preparation. In the rough grinding stage, the rotating speed is set to be Va, and the lasting time is Ta; in the fine grinding stage, the rotating speed is set to be Vb, and the lasting time is Tb; in the polishing stage, the rotating speed is set to be Vc, and the lasting time is Tc; an abrasive paper annular three-area reuse strategy is adopted; according to the abrasive paper partition design, an abrasive paper disc is divided into three concentric ring areas, and from an outer ring to an inner ring, the mesh number range of the abrasive paper on the outer ring is P80-P240; the mesh number range of the abrasive paper of the middle ring is P320-P600; the mesh number range of the abrasive paper of the inner ring is P800-P1500; identifying and replacing, and transferring the sample to middle ring abrasive paper to perform accurate grinding operation when the outer ring abrasive paper is worn to be incapable of meeting the rough grinding effect; when the middle ring abrasive paper is abraded until the fine grinding effect cannot be met, the sample is moved to the inner ring abrasive paper to be polished; and the energy consumption is optimized.

The invention belongs to the technical field of fluid machinery, and provides a variable guide vane radial subdivision single-stage double-support hydraulic turbine which comprises a shell, a pump cover, an impeller, a main shaft, a bearing body and a guide vane assembly. Wherein a liquid inlet flow channel is formed in the shell; the pump cover is detachably connected to the shell and matched with the shell to form a containing cavity. The impeller is arranged in the accommodating cavity and can rotate in the accommodating cavity; the main shaft is coaxially connected with the impeller and penetrates through the shell and the pump cover; the bearing bodies coaxially sleeve the head and tail ends of the main shaft and are used for supporting the main shaft; the guide vane assembly is arranged in the containing cavity and detachably connected with the shell, the guide vane assembly further forms a plurality of guide vane parts concentrically and annularly arranged on the periphery of the impeller, the guide vane parts are arranged at the same intervals, and the liquid inlet flow channel communicates with a liquid inlet of the impeller through the intervals between the adjacent guide vane parts.

The present disclosure relates to apparatuses for producing nanoparticles from a material in a working liquid and optionally to produce hydrogen, and to top-down methods for producing nanoparticles and optionally hydrogen using such apparatuses. A core of such an apparatus can include a first disc and a second disc including holes arranged in concentric rings and channel portions between those rings. The first disc and the second disc are arranged such that the channels of each disc face the rings of the other disc.

The invention discloses an athermalization intensive type multi-reflector cavity based on an off-axis mirror and a light spot control method, the multi-reflector cavity comprises a main reflector and a secondary reflector, a first off-axis reflector is nested in a local area of the main reflector, a second off-axis reflector is nested in a local area of the secondary reflector, and the first off-axis reflector and the second off-axis reflector are arranged in parallel. An incident hole or an emergent hole is formed in the primary reflector or the secondary reflector; a light beam enters from the incidence hole and is reflected back and forth between the primary reflector and the secondary reflector so as to form a plurality of light spots on the primary reflector and the secondary reflector, same-stage concentric rings are formed among the light spots, and the second off-axis reflector can reflect the light beam in the first-stage concentric ring to the second-stage concentric ring. The first off-axis reflector receives the light beam reflected by the second off-axis reflector and reflects the light beam to the second-stage concentric ring of the secondary reflector, and the light beam forms a multi-stage concentric ring after being reflected for multiple times and is emitted from the emitting hole. According to the invention, the utilization rate of the mirror surface can be improved, and the positions and number of light spots can be accurately controlled.

A wearable device, such as a wearable ring device, configured to transition between multiple discrete ring sizes is described. For example, the wearable ring device may include multiple rings coupled to one another (e.g., adjacent, parallel, or concentric rings), where a user may manipulate or adjust the rings relative to one another to transition between multiple discrete ring sizes. In some cases, the multiple rings may be oval or elliptical-shaped, where rotating the rings relative to one another may change the size of the ring. In some other cases, the multiple rings may be threaded such that they may be screwed into and out of one another. In some other cases, the wearable ring device may include a long housing that may coil into itself to form multiple concentric loops, where coiling or uncoiling the concentric loops adjusts the ring size.

A portable centrifuge comprising a base, which includes a rotational mechanism contained within. A sequester wheel having a plurality of concentric rings, forming at least one channel and a central container. The at least one channel comprising a second volume and the central container comprising a first volume. A first cover is disposed over the sequester wheel to create a seal. A second cover is disposed over the first cover and is rotatable to engage with the rotational mechanism to initiate rotation at a predetermined RPM. The whole blood and / or other tissue is separated into its constituent components and deposited into the at least one channel and the central container. Specific volumes of the constituent components may be calculated to match or substantially match the first and second volumes for predetermined volume control and ease of access.

A rolling-element bearing includes first and second concentric ring assemblies and rolling elements supporting the ring assemblies for relative rotation. The first ring assembly includes a first rolling ring and a first sealing ring mounted axially to the first rolling ring and supporting a first seal element and a second seal element, and the second ring assembly includes a second rolling ring and a second sealing ring mounted axially to the second rolling ring. The first seal element includes a first lip in contact with the second sealing ring and the second seal element includes a second lip in contact with the second sealing ring, the first and second lips delimiting a first chamber between the first and second sealing rings, A first purging channel extends from an inlet at the first chamber to at least one outlet in at least one external surface of the second rolling ring.

An ultra-high flux quantitative phase imaging (QPI) system incorporates a real-time rotating cell detection based platform with concentric annular cell chambers (20). Each chamber (20) has a detection region (22) and a pair of access channels (24) with openings (25) between the ends. The access channel (24) serves to deliver a fluid containing the cell sample introduced into the opening (25) to the detection region (22). The opening (25) faces an inner radial position of the rotating platform compared to the detection area (22) so as to prevent liquid within the detection area (22) from being squeezed out by centrifugal force when the platform rotates, while communicating with the external environment before, during and after rotation.

A rolling-element bearing includes first and second concentric ring assemblies mounted for relative rotation. The first ring assembly includes a first rolling ring and a first sealing ring supporting first and second seal elements each having a lip. The second ring assembly includes a second rolling ring and a second sealing ring contacted by the lips of the first and second seal elements. The first sealing ring includes a first sealing member radially spaced from the first seal element and a first leakage test channel having an inlet between the first sealing member and the first seal element and an outlet at an external surface of the first sealing ring, and / or the second sealing ring includes second and third sealing members and a second leakage test channel having an inlet between the second and third sealing members and an outlet at an external surface of the second sealing ring.

A concentric circular microphone array (CCMA) may include a number of omnidirectional microphones and an equal number of directional microphones, wherein the omnidirectional microphones and the directional microphones form a plurality of concentric rings on a substantially planar platform. Each of the plurality of concentric rings includes a subset of the omnidirectional microphones and a subset of the directional microphones (e.g., arranged in mixed pairs of microphones). Responsive to a sound source, the omnidirectional microphones and the directional microphones may respectively generate first and second electronic signals. A target beampattern of Nth order may be specified for the CCMA. An Nth order beamformer for the CCMA, that is steerable in a three-dimensional space including the sound source, may be determined based on the specified target beampattern. The beamformer may be executed to calculate an estimate of the sound source based on the first electronic signals and the second electronic signals.

The invention relates to a planar active focusing air coupling ultrasonic transducer, and belongs to the technical field of piezoelectric ultrasonic transducers, and the planar active focusing air coupling ultrasonic transducer is characterized in that a piezoelectric plate and a matching layer are arranged in a shell; the rear cover plate covers the tail end of the shell; the interface is arranged on the shell; a plurality of concentric annular structure electrodes are arranged on the first surface of the piezoelectric plate; the width of each concentric ring in the plurality of concentric ring structure electrodes is gradually increased from outside to inside; a second surface of the piezoelectric plate is provided with a second electrode; and the piezoelectric plate is connected with the interface through leads led out from the plurality of concentric ring-shaped structure electrodes and the whole-surface electrode. According to the plane active focusing air coupling ultrasonic transducer provided by the invention, active focusing of a plane acoustic beam is realized by changing the electrode structure of the piezoelectric plate and arranging a plurality of concentric annular electrode structures on the single surface of the piezoelectric plate, and the plane acoustic impedance matching layer with uniform thickness is matched; and the sensitivity of the focusing air coupling transducer is improved under the condition that the transverse resolution of the transducer is not influenced.

A rolling-element bearing includes first and second concentric ring assemblies. The first ring assembly has a first rolling ring and a first sealing ring abutting axially at a joint, and the first sealing ring supports a first seal element and a second seal element located axially between the first sealing element and the first rolling ring. The second ring assembly has a second rolling ring and a second sealing ring mounted axially at a joint, and rolling elements support the ring assemblies for relative rotation. The first and second seal elements have lips in contact with the second sealing ring, and the lips delimit a first chamber between the first and second sealing rings. The first lip and the second lip extend obliquely toward each other, and a first purging channel extends from the first chamber to an external surface of the first ring assembly.

Some implementations herein provide a semiconductor substrate including a multi-layer alignment mark structure and methods of formation. The multi-layer alignment mark structure may include concentric rings (e.g., a multi-ring bond mark structure) and a dummy pad structure below the concentric rings. For a light source of a given wavelength, the dummy pad structure may create an optical contrast between the concentric rings and annular regions of a dielectric region in which the concentric rings are formed. The optical contrast may improve a detectability of the multi-layer alignment mark structure by an automated optical inspection system relative to another alignment mark structure not including the dummy pad structure. The improved detectability, may in turn, reduce an amount of recognition errors by the automated optical inspection system detecting the multi-layer alignment mark structure to improve an efficiency of a semiconductor processing tool including the automated optical inspection system.

The application provides a wafer double-side grinding device and method using a special-shaped grinding wheel. The device comprises: a carrier ring for loading and positioning a wafer; a driving assembly connected with the carrier ring for driving the carrier ring to rotate; a first static pressure plate arranged on one side of the carrier ring, the first static pressure plate being provided with air holes and water holes, the air holes being used for adsorbing and fixing the wafer when the wafer is positioned on the carrier ring; a second static pressure plate arranged on the other side of the carrier ring, the second static pressure plate also being provided with air holes and water holes, the air holes and water holes on the first static pressure plate and the second static pressure plate being used for spraying water and air on the wafer at the same time when the wafer is ground; and two elliptical grinding wheels symmetrically arranged on two sides of the wafer, the two elliptical grinding wheels being used for rotating in different directions to grind the wafer, wherein the minor axis of the elliptical grinding wheel passes through the center of the wafer, and the major axis of the elliptical grinding wheel covers the end face of the wafer. The device can disperse periodic stress and solve the problem of concentric ring lines.

The present invention discloses a method and device for predicting well-controlled reserves of a heterogeneous buried-hill gas reservoir, the method comprising: dividing the gas reservoir into N seepage areas along the radial direction of the wellbore according to the heterogeneity, the N seepage areas are distributed in concentric rings, and obtaining basic parameters of the N seepage areas; establishing a pressure propagation equation of the gas reservoir along the radial direction from the center of the concentric circles, and obtaining the well-controlled radius of the gas reservoir through the pressure propagation equation; and predicting well-controlled reserves using the well-controlled radius of the gas reservoir. The present application can take into account the characteristics of heterogeneous distribution of buried-hill gas reservoirs, is more consistent with the actual situation, and realizes accurate prediction of well-controlled reserves.

An aerial vehicle configured for operation within indoor spaces has a meshed construction with a housing defined by upper and lower sections having meshes provided above and below propellers and motors of the aerial vehicle. The aerial vehicle also includes a suite of sensors such as LIDAR sensors, time-of-flight sensors, cameras, ultrasonic sensors, or others. Meshes of the upper and lower sections include central openings along with spokes and concentric rings provided about the central openings. Meshes of the lower section have substantially larger central openings than meshes of the upper section, but feature more dense spokes or concentric rings beneath tips of the rotating propellers, which may be hinged or foldable in nature. Data captured by sensors of the aerial vehicle may be utilized for any purpose, such as to generate environment maps of an indoor space, or to monitor the indoor space for adverse conditions or events.

This invention relates to the field of semiconductor lasers, and more particularly to a multi-chip ring array vertical cavity surface-emitting laser (VCSEL), comprising: a gain chip array, a beam-splitting axial conical lens group, a beam-combining axial conical lens group, and an output coupling mirror arranged coaxially. The gain chip array includes N (N>1) VECSEL gain chips arranged in M ​​concentric rings (M>1). The beam-splitting axial conical lens group includes M beam-splitting axial conical lenses. The beam-combining axial conical lens group includes M beam-combining axial conical lenses. The N laser beams first pass through the beam-splitting axial conical lens group to generate M-order Bessel beams, and then pass through the beam-combining axial conical lens group to combine into a resonant beam. This resonant beam resonates within the coaxial resonant cavity formed by the output coupling mirror and the gain chip array, resulting in the output laser beam. This invention employs a modular cascaded structure of axial conical lenses, realizing the parallel superposition of multiple rings of chips, fully utilizing the radial spatial dimension, and improving chip integration density.

The invention discloses a spacecraft ground full-physical simulation system attitude measurement calibration method and device, and belongs to the technical field of spacecraft measurement. The objective of the invention is to solve the problem of real-time measurement of the attitude of a spacecraft ground full-physical simulation system. A cross laser generator, a concentric circular ring coding target, a monocular camera and a processing unit are fixedly installed on a three-axis air bearing table, the monocular camera is fixedly arranged on one side of the cross laser generator, and the monocular camera is connected with the processing unit. Laser emitted by the cross laser generator vertically irradiates the plane of the concentric circular ring coding target, the concentric circular ring coding target adopts a concentric circular ring coding array design, and each group of concentric circular ring coding units is composed of a plurality of hollow circular rings which are concentrically arranged. And generating a code ID of each group of concentric circular ring coding units through radius proportion combination of the adjacent hollow circular rings. The method is stable in long-term operation precision, greatly reduces the workload of element installation and calibration, does not need a complex field calibration process, and is flexible in installation and deployment.

The invention discloses a large-view-field compound eye telescopic system suitable for daytime observation, and belongs to the technical field of optical system design. The system comprises a primary mirror, a compound eye optical unit, a refraction correction mirror group unit and a photoelectric detector unit which are sequentially arranged along an optical axis. The compound eye optical unit adopts a light splitting reflection cube-corner prism structure, and divides a focal plane of a primary lens into X paths of sub-view fields; the refraction correction lens group unit comprises n correction lens groups with built-in field diaphragms; a concentric annular light barrier group is arranged on the inner wall of the primary mirror chamber. Large-view-field observation is realized through optical splicing of a compound eye structure, strong background stray light in the daytime is remarkably inhibited by utilizing a built-in view field diaphragm and combining multiple scattering absorption of a light barrier group, and the stray light coefficient of the system is lower than 1.11 * 10 <-7 >. The technical problem that an existing optical telescope cannot carry out high-contrast large-view-field observation in the daytime is solved, and all-weather monitoring of near-earth celestial bodies is achieved.

A collapsible camping stove is described that is lightweight and quick to assemble for cooking and putting away for storage. The collapsible camping stove includes telescoping rings with tabs of concentric rings inserted into slots of adjacent rings. The slots include horizontal and vertical portions so that the rings can be fastened in an expanded position by moving the tabs to the horizontal portions of the slots. A cooking grate is placed on top of an innermost telescoping ring. The outside cover covers the collapsible camping stove while fully collapsed. Methods of constructing the collapsible camping stove and methods of using the collapsible camping stove are also described.

The present invention belongs to the field of polishing equipment, and specifically provides a polishing equipment for diamond crystals and a polishing method thereof, wherein the polishing equipment for diamond crystals comprises: a support frame; a rotating table, which is rotatably arranged on the support frame, and a plurality of concentrically arranged annular liquid storage tanks are provided on the top surface of the rotating table; a driving mechanism, which is arranged on the support frame and used to drive the rotating table to rotate; and a polishing cloth, which is arranged on the rotating table and used for chamfering and polishing the diamond crystal. By arranging a plurality of concentrically arranged annular liquid storage tanks on the top surface of the rotating table, when the rotating table rotates, the polishing liquid in the annular liquid storage tanks splashes outward under the action of centrifugal force, thereby continuously infiltrating the polishing cloth facing the annular liquid storage tanks, maintaining sufficient water in the polishing cloth, thereby avoiding the phenomenon of crystallization of the polishing liquid in the polishing cloth. At the same time, the utilization efficiency of the polishing liquid is improved, the waste of the polishing liquid is reduced, and the cost of polishing is reduced.