34 results about "Position resolution" patented technology

The invention provides a high-gain 4H-SiC ultraviolet position sensitive detector and a preparation method thereof, and relates to the technical field of semiconductor photoelectric detection. A high-gain 4H-SiC ultraviolet position sensitive detector is realized through a first n-type 4H-SiC layer, a p-type 4H-SiC layer and a second n-type 4H-SiC layer, namely, an n +-p-n-structure, and a wide bandgap semiconductor material 4H-SiC is used as a device main body for migration of carriers irradiated by light. The material has the outstanding characteristics of large forbidden band width, high critical displacement energy, high thermal conductivity coefficient, good chemical stability and the like. According to the device structure, by introducing an internal gain mechanism, the photoelectric conversion efficiency and the position resolution ratio under the weak light condition are remarkably improved, and the limitations that an existing silicon-based PSD is large in background noise, and performance attenuation or damage is prone to occurring under the extreme environments of high temperature, intense radiation and the like are effectively overcome.

The application discloses a kind of muon track detector design and performance evaluation method, it is related to the field of detector structure design;Two kinds of scintillator array layout scheme for muon track detector structure design are presented, one is based on the staggered layout of right triangular prism μ The track detector structure of son, can reflect better position resolution performance, especially after combining μ Son energy screening, can significantly improve the position resolution performance of μ Son detector.And the position resolution performance of the μ The track detector structure based on the staggered layout of diamond column is better when the comprehensive performance of broad spectrum energy μ Son is incident, the detection area is larger, and the number of readout channels can be reduced to reduce cost.The present application is conducive to improving the comprehensive performance of μ Son track detector, increasing the detection area, reducing the position resolution error, reducing the number of channels, reducing the cost and the like.Through the present application, this scheme and performance evaluation method can be widely applied to the detector design and performance evaluation in the field of μ Son imaging, μ Son track detection.

The invention belongs to the field of aero-engine health monitoring and fault diagnosis, relates to a surge monitoring technology, and provides a multi-parameter-based aero-engine surge identification method, which comprises the following steps of: acquiring an asynchronous vibration amplitude of a blade tip of a fan blade, a pulsation coefficient of an outlet of a gas compressor and a dynamic change rate of a fan support axial load; the three parameters are compared with corresponding threshold values respectively, and the surge position is judged according to specific logic: when the compressor outlet pulsation coefficient is not lower than the threshold value, if the axial load change rate or the vibration amplitude exceeds the limit, the compressor end surge is judged; and when the pulsating pressure is lower than the threshold value, if the change rate of the axial load and the vibration amplitude exceed the limits at the same time, fan end surge is judged. According to the method, single signal misjudgment is effectively avoided through multi-parameter fusion and surge position judgment logic, the surge recognition accuracy and the position resolution capability are remarkably improved, and the method is particularly suitable for complete machine level real-time monitoring.

The invention relates to the technical field of semiconductor device photoelectric detection, in particular to a silicon carbide-based ultraviolet position sensitive detector based on a thin Schottky metal material and a preparation method thereof, and the silicon carbide-based ultraviolet position sensitive detector comprises an N-type ohmic contact lower electrode, an N-type silicon carbide substrate and an N-type silicon carbide low-doped epitaxial layer which are sequentially connected from bottom to top; the N-type silicon carbide low-doped epitaxial layer is provided with a Schottky metal film with the thickness lower than 4 nm, and the Schottky metal film is used for forming a photosensitive area. A plurality of metal conductive electrodes are arranged at the edge of the top of the Schottky metal film, are electrically connected with the Schottky metal film and are used for leading out position-related electric signals. The problems that an existing pn junction type position sensitive detector is limited in response speed and insufficient in time resolution are effectively solved, and the detection efficiency and the position resolution capacity of the detector in the vacuum ultraviolet band are effectively improved.

A wireless channel type detection method and apparatus. The type of a channel can be identified on the basis of at least one of carrier phase slope consistency, a ratio of phase differences of carrier phases at different times, and a carrier path loss, i.e., the type of the channel is determined to be LOS transmission or NLOS transmission. Thus, the precision of positioning resolution can be effectively improved.

The invention discloses a channel gain correction method and system for a multi-channel detector, and relates to the technical field of nuclear radiation detection. The method comprises the following steps: collecting original event data by using a multi-channel detector; energy of all channels triggered by the same event is obtained through action time judgment; calculating the total energy value of each event through the energy of each channel to which each event belongs, counting all events, constructing the total energy spectrum of the channel events, setting an energy screening window according to the position of a photoelectric peak in the total energy spectrum, and reserving the events in the energy screening window as an effective event set; performing channel gain coefficient correction by using an iterative algorithm, and monitoring the energy resolution in real time until convergence; and performing channel-level gain compensation on all original event data by using the finally obtained gain coefficient, and outputting and displaying a corrected energy spectrum and a gain distribution diagram. After gain correction, the energy resolution and the position resolution of the detector can be remarkably improved, and the imaging quality and the quantitative accuracy of the system are improved.

The invention provides a cesium iodide crystal detector packaging structure and method, and belongs to the technical field of high-energy physical detectors. The cesium iodide crystal detector packaging structure comprises two groups of optical fiber modules, two groups of optical fiber readout SiPM, two groups of crystal readout SiPM and cesium iodide crystals, the two groups of optical fiber modules are tightly attached to the upper surface and the lower surface of the cesium iodide crystal respectively and are orthogonally arranged; the two groups of optical fiber reading SiPMs are respectively arranged on the two groups of optical fiber modules and are used for reading photons propagating to the tail ends of the optical fibers; the two groups of crystal read-out SiPMs are respectively clung to the two side surfaces of the cesium iodide crystal, are orthogonally arranged and are used for reading out photons propagating to the side surfaces of the cesium iodide crystal. According to the invention, photon number measurement can be provided while position resolution is measured, and the energy resolution capability is improved; the structure optimization degree is high, and substance interference does not exist on an incident particle path; the structure is convenient to install, corresponding operation is adopted, and detector packaging can be effectively completed.

The application discloses a novel ray detector, characterized in that the novel ray detector comprises a Cerenkov radiation material window, a photocathode surface plated on a light exit surface of the Cerenkov radiation material window, a microchannel plate and a readout circuit board; wherein the Cerenkov radiation material window is a glass optical fiber panel, used for receiving incident gamma rays and inputting Cerenkov light generated by the incident gamma rays into a fiber core to the photocathode surface; the photocathode surface is used for converting the Cerenkov light into photoelectrons and transmitting the photoelectrons to the microchannel plate through a vacuum electric field; and the microchannel plate is used for inputting the received photoelectrons into the readout circuit board after amplification by multiplication. The application can realize better position resolution.

The invention provides a method for rapidly forming and processing a V-shaped channel micropore array optical element on a single transparent glass substrate and the prepared micropore array optical element, and the method comprises the following steps: carrying out synchronous laser drilling on a vertically placed glass sheet by adopting inclined double laser processing heads positioned on the same horizontal base line by utilizing a laser-induced etching technology; and then carrying out wet etching treatment, and rapidly forming and processing the V-shaped channel micropore array optical element on a single transparent glass substrate. The structure of the V-shaped channel is controlled by independently regulating and controlling the inclined angle, the wire length, the energy and the focus processing parameters of laser emitted by each laser processing head; the problems that a traditional straight-channel micro-channel plate is large in positive ion feedback noise, multiple stacked V-shaped and Z-shaped micro-channel plates are poor in position resolution time response performance, and a hot-melt pressure bending micro-channel plate is poor in curvature consistency are solved, and the micro-channel plate can be applied to the field of photoelectric detection imaging requiring low ion feedback, ultrahigh gain and fast time response.

The application relates to a method for processing muon detection data of a triangular prism scintillator. S1: obtaining uncorrected energy deposition information and uncorrected hit position of each muon event in each layer detection unit; S2: based on the actual structure parameters of the detector, performing geometric correction on the traditional centroid algorithm; S3: based on the statistical relationship between the energy deposition of the muon in the scintillator and the track length, establishing a signal channel gain coefficient model, and correcting the energy response of each detection channel; S4: based on the fitting results of the muon track length and the energy of each channel, determining the energy consistency standard, and performing rejection processing on the muon events determined as abnormal; S5: performing muon track reconstruction and imaging, evaluating the position resolution of the detector, and if the convergence condition is reached, ending, otherwise returning to S2 for iteration. The technical scheme can improve the muon track reconstruction accuracy and imaging quality through geometric structure correction, energy correction and abnormal energy event screening.

This invention discloses a UAV 3D coverage path planning method based on Monte Carlo tree search. The method uniformly samples the search space and angles according to positional and angular resolutions, eliminating viewpoints located inside the model. Viewpoints that are too close or too far from the model are eliminated based on safe distance and sensor detection distance. The visible point cloud sequence of the viewpoint is calculated based on the angle between the viewpoint camera's line of sight and the point cloud point normal vector, and unqualified viewpoints are then eliminated accordingly. A sub-viewpoint sequence is generated for each viewpoint based on distance relationships. Then, for the current viewpoint, expansion, simulation, backtracking, and selection are performed according to the Monte Carlo tree search concept until the coverage meets the requirements. This invention ensures the detection quality of UAVs when detecting large 3D structures, while reducing redundancy in the full-coverage path, improving the detection efficiency and energy utilization of the UAV detection process. Furthermore, its viewpoint generation process ensures good algorithm flexibility and robustness.

The invention is entitled "Systems and methods for assisted navigation using distributed avionics processing." The invention discloses methods, systems, and non-transitory computer-readable media for distributed vehicle navigation processing for a vehicle. For example, the method can include, by the vehicle: obtaining reference data from one or a combination of an imaging system, an antenna system, and / or a radar system of the vehicle; in response to obtaining the reference data, determining whether a GNSS signal is below a threshold; and in response to determining that the GNSS signal is below the threshold, transmitting a navigation assistance request message including the reference data to an edge node or a cloud node. By the edge node or the cloud node: in response to receiving the navigation assistance request message from the vehicle, performing a position resolution process to determine and transmit a position of the vehicle by one or more functions. By the vehicle: performing a navigation control process based on the determined position.

The application relates to a positioning system, a positioning method, a navigation method, a storage medium and a computer program product. The positioning system comprises a base station, a core network, a navigation relay server and a position resolution calculation server; the base station is in communication connection with the core network; the navigation relay server is in communication connection with the base station, the base station is in communication connection with the position resolution calculation server, the position resolution calculation server is in communication connection with the navigation relay server; when a user equipment is attached to a communication network, the core network allocates a first IP address for the user equipment through the base station, the base station sends orthogonal data of a reference signal and a user identifier to the position resolution calculation server, the reference signal is used for positioning the position of the user equipment, and the user identifier comprises the first IP address; and the position resolution calculation server obtains coordinate information corresponding to the first IP address based on the orthogonal data. The technical scheme of the application can realize universal and accurate positioning and navigation in an indoor scene, and can avoid invading the privacy of customers.

This invention discloses a channel gain correction method and system for a multi-channel detector, relating to the field of nuclear radiation detection technology. The method includes: acquiring raw event data using a multi-channel detector; determining the energy of all channels triggered by the same event based on the action time; calculating the total energy value for each event using the energy of its respective channels, statistically analyzing all events to construct the total energy spectrum of the channel events, and setting an energy filtering window based on the position of the photoelectric peak in the total energy spectrum, retaining events within the energy filtering window as the valid event set; using an iterative algorithm to correct the channel gain coefficients, and monitoring the energy resolution in real time until convergence; applying the finally obtained gain coefficients to perform channel-level gain compensation on all raw event data, and outputting and displaying the corrected energy spectrum and gain distribution map. Gain correction can significantly improve the energy resolution and position resolution of the detector, enhancing the system's imaging quality and quantitative accuracy.

The application discloses a towed array passive positioning method based on wideband matrix filtering, calculates a sound field propagation matrix by using a two-dimensional parabolic equation model, obtains different distance sound source-receiver system propagation matrices through matrix multiplication operation, extracts matrix coefficients from different distance system propagation matrices according to sound source depth and horizontal array element positions, and forms a new sparse system propagation matrix. The sparse system propagation matrix is processed to form a wideband matrix filter set, finally, the horizontal array receiving signal is processed by using the wideband matrix filter set, energy normalization is performed on different distance processing results, a wideband distance-depth ambiguity diagram is formed, and target depth and distance estimation results are obtained. The application can effectively improve the target position resolution of the towed array wideband signal passive positioning, reduce the sidelobe intensity in the two-dimensional ambiguity diagram, and greatly reduce the energy outside the main lobe, and has important value for improving the target positioning performance in the actual environment.

The invention relates to a multi-pixel point liquid scintillation neutron detector for marking neutron beam imaging, which comprises a detector shell, and a liquid scintillator array, a light guide, a photomultiplier tube assembly and a fixed support which are sequentially arranged in the shell, a plurality of groups of light splitting grooves are formed in one surface, coupled with the liquid scintillator array, of the light guide, and a plurality of groups of light splitting grooves are formed in the other surface of the light guide; the structure of the light splitting groove is specially designed to improve the light collection capability and the resolution capability of edge points of the scintillator array, the resolution of 100 pixel points is realized by adopting four photomultipliers, the parallelism and the pressure of a single photomultiplier can be independently adjusted by a fixed bracket, and the resolution efficiency of the scintillator array is improved. And each photomultiplier can be ensured to be attached to the light guide to the greatest extent. The device is compact in structure and easy to assemble, and the marked neutron position resolution capability and background interference resistance of the detector can be improved.

The utility model provides a camera lens device based on wavefront coding, and belongs to the technical field of optical detection. The camera lens device based on wavefront coding comprises a lens barrel and an industrial camera, the rear end of the lens barrel is connected with the industrial camera, an original infrared lens is installed in the lens barrel, a phase plate is fixed at the front end of the lens barrel, and a diaphragm is arranged between the phase plate and the original infrared lens. A phase plate is added, and the depth of field of the camera is expanded by using an encoding-decoding method, so that the measurement precision of the infrared deflection technology is improved; a wavefront coding method is adopted, so that the system is insensitive to defocus, and coding is realized by adding a phase plate into a camera lens; the phase plate is added, and the depth of field of the lens is expanded, so that in infrared deflection measurement, the camera can clearly image the measured lens and the light source, the position resolution and the angle resolution are improved, and the surface type reconstruction precision is improved.

The utility model relates to the technical field of reactor detection, in particular to a device for neutron flux distribution detection, which comprises a supporting plate, a plurality of detector fixing grooves arranged in a multi-row matrix are uniformly arranged on the supporting plate, one end of each detector fixing groove is provided with a cable groove, and the other end of each detector fixing groove is provided with a cable. According to the utility model, the housing of the collection body is cylindrical, so that external pressure can be uniformly dispersed to each position, and the detection body is arranged in each detector fixing groove through braze welding, and the transmission cable is arranged at the rear end of each detector body, and is fixed in the cable groove through braze welding. According to the neutron flux distribution detector, the pressure resistance of the detectors is improved, the multiple detectors are fixed to the supporting plate in a multi-row matrix mode to form a whole, online measurement of neutron flux distribution in a fuel element can be more accurately carried out, the installation positions of the detectors are fixed, the detection positions are accurate, and therefore the position resolution precision of flux distribution detection is improved.

The present application relates to the technical field of detector, and provides a preparation method of a radiation-resistant silicon carbide detector chip containing a transparent electrode and application thereof, the chip is a vertically incident detector chip from the top surface, and from top to bottom includes a first electrode, a transparent electrode, an ohmic contact layer, an intrinsic layer, a silicon carbide substrate and a second electrode; the first electrode is in a whole annular structure, the annular part of the first electrode is located at the edge of the transparent electrode and is in ohmic contact with the first electrode; an electric dipole layer is formed between the transparent electrode and the ohmic contact layer, for receiving photons or high-energy particles and performing carrier transport. The silicon carbide detector chip prepared in the present application can not only meet the application requirements of heavy ion detection, nuclear reactor detection and performance test of silicon carbide detector based on transient current technology (TCT) of ultraviolet laser, but also significantly improve the time resolution performance and position resolution performance of the silicon carbide detector to the passing particles.

A control system for laser pointing, the exemplary embodiment adopts an analog voltage signal based on a PSD sensor to obtain two-dimensional position information for calculating a laser spot, through the high position resolution and fast response characteristics of the PSD sensor, the laser acting on the target surface of the PSD sensor is captured in real time and accurately, the micron-level deviation is quickly identified, and the signal acquisition with high precision, high speed and low noise is realized at the hardware level, providing high-fidelity position feedback data for the closed-loop control of laser pointing; the host computer obtains the operation feedback signal by comparing and analyzing the captured two-dimensional position signal; the data acquisition card and the piezoelectric ceramic fast mirror with a collection frequency greater than the preset frequency threshold are selected, which matches the high-speed characteristics of the PSD sensor, and solves the bottleneck problem of response delay at the system architecture level, through the high-frequency collection of the analog voltage signal by the data acquisition card and the output of the operation feedback signal, the high-speed processing closed loop of the collection and processing process is realized.

The invention discloses a dual-motor windshield wiper position estimation and synchronous control system and method and a windshield wiper system, and the system comprises a sampling processing layer which is configured to be used for collecting current signals and PARK switching signals of dual motors; the fusion estimation layer is connected with the sampling processing layer and is configured to be used for executing current signal processing, position pulse extraction, periodic learning and fusion position estimation and outputting normalized phase values of the double motors; and the synchronous control layer is connected with the fusion estimation module, and is configured to calculate the phase error of the double motors, execute PI adjustment and feedforward collision avoidance control according to the error size and a risk window, and generate a PWM control signal for driving the double motors. According to the dual-motor windshield wiper system adopting the system, the position resolution is greatly improved, fusion positioning is stable and reliable, synchronous control is rapid and accurate, cost is low, adaptability is high, and meanwhile fault diagnosis and safety protection are enhanced.

The application provides a point positioning method based on 3-D Moire effect, and a point positioning system based on 3-D Moire effect, which utilizes 3-D Moire effect caused by a shadow of a serial mask fixed in front of a bare camera sensor to perform accurate spatial point positioning, and a beacon marked on a target point is illuminated; the beacon is the target point to be positioned; the method adopts a positioning spectrum method to deduce a geometric relationship between the beacon and a Moire pattern; a positioning model of the positioning spectrum method is equivalent to a pinhole model with a periodic extended range, and a frequency of a mask pattern of the positioning model determines an analog focal length; the application is easy to implement, the algorithm is intuitive and simple, and positioning resolution and accuracy are about one order of magnitude higher than those of a benchmark model (including a pinhole model and a single mask model).

The invention discloses a positron annihilation lifetime spectrometer system with three-dimensional position resolution capability, which belongs to the technical field of nuclear detection and comprises a positron annihilation lifetime measuring device and a high-precision X-Y plane moving device. The positron annihilation life measuring device is used for acquiring annihilation characteristics of positron in different depth intervals within a millimeter depth range from the surface of a material, and comprises a life starting module and a life ending module which are respectively connected with an information acquisition module, and the information acquisition module is connected to a control and processing module; the high-precision X-Y plane moving device is used for moving the detector part of the positron annihilation life measuring device so as to realize scanning test of an X-Y plane, and comprises three servo motors and three sliding rails respectively controlled by the servo motors. According to the invention, three-dimensional space characterization can be carried out on microstructure characteristics of different depth intervals in a millimeter-level depth range from different areas of the surface of the material to the surface.

The present invention provides an astronomical positioning and navigation method based on optical observation, comprising: screening and sorting observation targets to be observed based on the platform's initial conditions and the ephemeris of the observation targets to form an observation task list; driving the optical telescope to steer and collect observation images based on the observation task list; matching the constellations in the observation images with a star catalog to calculate the observed celestial coordinates of each constellation; extracting moving targets as observation targets by changes in the constellations in multiple frames of observation images to obtain the motion trajectory of the observation targets; and performing platform position resolution. The astronomical positioning and navigation method of the present invention integrates optical observation data of stars and observation targets to complete platform attitude and position resolution, enabling autonomous navigation and positioning of the platform in the absence of GNSS signals.

The invention relates to a high-resolution crystal imaging detector signal processing method and system. The method comprises the following steps: acquiring a plurality of high-sampling-rate crystal signal waveforms; integral value calculation is carried out on the multiple crystal signal waveforms, and the multiple crystal signal waveforms are converted into corresponding position signals; mapping the plurality of position signals to the same image to obtain a crystal image; based on a neural network algorithm, multilayer convolution and pooling operation are carried out on crystal imaging, region boundary and structure information in the crystal imaging is extracted, pixel-level segmentation is carried out on the crystal imaging, a crystal array is obtained, and the neural network algorithm is obtained based on machine learning. The method obtains the crystal signal waveform with a high sampling rate to obtain the crystal image containing position information, improves the completeness of the signal waveform, effectively avoids information loss, carries out the pixel-level segmentation of the crystal image through employing a neural network algorithm, improves the position resolution, reduces the edge crystal adhesion, and improves the position definition of a crystal array.

This invention belongs to the field of sensor technology and is a self-powered vector displacement-vibration threshold monitoring sensor for mining applications. It solves the technical problems of insufficient spatial position resolution, accuracy, and real-time performance in existing vibration sensors. The top surface of the acrylic substrate fixing plate is covered with interdigitated electrodes and a P-type silicon layer. A polymer film is attached to the top surface of the interdigitated electrodes, and a gold back electrode is attached to the bottom of the P-type silicon layer. A collecting electrode is attached to the side wall of the acrylic substrate moving plate, and a friction electrode is attached to the bottom surface of the acrylic substrate moving plate. An AC circuit is connected between the two poles of the interdigitated electrodes, a first DC circuit is connected between the collecting electrode and the friction electrode, and a second DC circuit is connected between the friction electrode and the gold back electrode. This invention can monitor the direction of vibration and determine the spatial position by judging the forward and reverse displacement within a safe area. It responds promptly and sensitively to sudden signal changes, thus achieving highly sensitive vibration threshold monitoring.

The invention provides a muon imaging technology-based detection device and method using muon momentum. Relates to the fields of customs and frontier freight detection technology, safety and nuclear energy and nuclear technology. The detection device comprises a muon track acquisition module, a time-of-flight spectrometer, an electronics acquisition sub-device and a data analysis system, the muon track acquisition module comprises a muon incident track acquisition sub-module and a muon emergent track acquisition sub-module; the muon incident track acquisition sub-module and the muon emergent track acquisition sub-module are at least three high-position-resolution multi-air-gap resistive plate chambers which are arranged in parallel in a sealed cavity respectively; the time-of-flight spectrometer comprises a muon incidence time detection module and a muon emergence time detection module, and the muon incidence time detection module and the muon emergence time detection module are respectively at least one high-time-resolution multi-air-gap resistive plate chamber in the sealed cavity; the detection device is good in imaging performance, short in imaging time and high in robustness.

The application discloses a micro-channel plate detector reading system, and relates to the field of nuclear and particle detection. The detector system comprises a micro-channel plate combination, a resistive layer, a bias voltage electrode layer, a sensing reading layer and multi-channel reading electronics arranged in sequence. The sensing reading layer comprises an insulating layer and a sensing reading electrode layer. The sensing reading electrode layer is arranged in the insulating layer. The resistive layer is a diamond-like carbon film. The application can improve the working life and position resolution of the MCP detector.

The application discloses a double-particle time sequence coding ray camera and a use method thereof, and the double-particle time sequence coding ray camera comprises a central detector, a ring-shaped double-mode coding aperture plate, a signal processing and analysis system, a rotating platform control system, a supporting platform and a rotating platform. The application solves the contradiction between the sensitivity and the spatial resolution of the traditional time sequence coding camera design to a great extent, realizes one-dimensional position resolution of particle reaction by using double-end signal reading of the detector, improves the sensitivity of the device by increasing the volume of the detector, and ensures the spatial resolution, and the application can be applied to detection and positioning imaging of out-of-control radioactive sources.

The invention provides a block-type irresistible cathode silicon drift detector, which adopts a block-type irresistible cathode, expands outwards in a spiral irresistible manner, increases the length of each circle and widens the width at the same time, and retains the autonomous voltage division characteristic of the whole spiral ring, so that the whole detector is formed by combining a plurality of blocks. Each block can independently regulate and control the cathode potential, so that uniform and non-interfering independent transverse electric field distribution is formed, electron drift path distortion is effectively reduced, a variant is designed, a center collection anode is optimized into a distributed anode array surrounding the whole perimeter of the detector, and the detection efficiency is improved. According to the design, the large-area SDD can provide accurate position resolution through multi-channel signal acquisition reading and position analysis.