46 results about "Multi detector" patented technology

The invention relates to the field of photoelectric detection and the technical field of simulation testing, and provides a laser short pulse echo simulation method, system and device for detection tracking. Comprising the following steps: acquiring spatial azimuth coordinates of a plurality of detectors and spatial azimuth coordinates of a laser galvanometer; according to the spatial azimuth coordinates of the detector and the spatial azimuth coordinates of the laser galvanometer, the spatial azimuth coordinates of the detector are converted into a local coordinate system with the laser galvanometer as the center, and the coordinates of the detector are obtained; calculating the azimuth deflection angle of the laser galvanometer according to the coordinates of the detector; galvanometer driving current parameters are calculated according to the azimuth deflection angle of the laser galvanometer; a step-by-step sequential circuit is adopted, a galvanometer driving current parameter is taken as a reference, and laser galvanometers are driven to deflect in sequence, so that laser pulses are captured by a plurality of detectors. According to the invention, through space coordinate dynamic solution and galvanometer accurate control, time division multiplexing of a single laser source to multiple detectors can be realized, and the resource utilization rate is obviously improved.

The invention relates to the field of post-accident gamma dose rate measurement, and provides a post-accident gamma dose rate dynamic measurement method and system based on multi-detector fusion, and the method comprises the steps: obtaining original signal data and environment parameter data; processing the original signal data, the environmental parameter data, the accumulated radiation dose and the displacement damage energy by adopting a deep learning network to obtain corrected signal data; processing the correction signal data and the environmental parameter data through a time sequence prediction network to obtain a dynamic weight distribution result of each detector; processing the correction signal data and the dynamic weight distribution result based on a self-calibration confidence evaluation network to obtain a confidence evaluation result; and processing the correction signal data, the dynamic weight distribution result and the confidence evaluation result through a weighted fusion algorithm to obtain a dynamic measurement result of the gamma dose rate after the accident. According to the invention, high-precision dynamic measurement, real-time damage compensation and nuclear safety level reliability evaluation of the gamma dose rate after an accident are realized.

The invention discloses an OCT-based light splitting frequency doubling method and a measuring system, and relates to the technical field of optical coherence tomography, and the method comprises the following steps: a light beam emitted by a light source is divided into a first light path and a second light path through an optical fiber coupler, the first light path is transmitted to a collimating lens group through a scanning detection part optical fiber interface, and is transmitted to a second light path through a two-dimensional scanning part; scanning an object to be measured through a focusing lens; a second light path enters the reference arm part, sequentially passes through the polarization regulator and the reference arm collimating mirror group and then is reflected by the reference arm reflecting mirror group; the first light path and the second light path interfere with each other in the optical fiber coupler, and interference light enters the light splitting path detection component after being generated. Interference light is dynamically distributed to multiple detector channels through the light splitting element, efficient multiplexing of a light path is achieved, and different sampling rate and resolution requirements are flexibly met under the control of the main control card through three modes of light splitting, optical switch switching and scanning light splitting.

In certain embodiments, an ophthalmic system for assessing a tear film of an eye comprises measuring devices and a computer. The measuring devices detect light reflected from the eye, where an ocular surface of the eye comprises the tear film, and generate data from the reflected light that describes the eye. The computer aligns the data corresponding to the same location for a plurality of locations, assesses the data at the locations to detect one or more abnormalities of the tear film, and determines a tear film description from the assessment of the data at the locations.

The invention relates to the technical field of combustible gas leakage detection, in particular to a multi-detector combustible gas distribution reconstruction device and method, and the device comprises a mobile carrier; the plurality of rotating platforms are arranged on the movable carrier; the detection assemblies are arranged on the rotating platforms and used for emitting light beams to the detection points of the target area and detecting current signals of diffuse reflection light of the detection points of the target area; the processing unit is arranged on the moving carrier and used for changing the orientation of the multiple rotating platforms to obtain concentration integral information of the different light paths and reconstructing combustible gas distribution of the target area according to the concentration integral information of the different light paths, and the concentration integral information comprises a concentration integral value calculated according to the current signal of each detection assembly. Therefore, the problems that leakage area information is difficult to grasp in the leakage detection and emergency process in the prior art, the system depends on advanced arrangement and cannot move, the number of detection light paths is small, and the detection process is neglected by only considering reconstruction and optimization algorithms are solved.

Disadvantages associated with present day instrument probes, e.g., active probes used with oscilloscopes, may be overcome by implementing an active probe entirely as a packaged integrated circuit (IC). The probe IC may be implemented in a small, low pin-count package to facilitate the mounting of many probe ICs in a small area. The probe IC may include an interface for configuration as well as customized software to control the probe IC and measurement instrumentation, for example, an oscilloscope, for a variety of applications. The probe IC may be implemented as any one of different types of probes, including active probes and passive probes, voltage probes and current probes, or single ended probes and differential probes.

The invention discloses a response non-consistency correction method for a multi-lens multi-detector spliced imaging system, and the method comprises the steps: constructing an initial compensation model of response differences between lenses according to optical design parameters and a ray tracing simulation result; carrying out on-satellite two-point calibration on each lens, and establishing a pixel-level initial linear response relationship; in an in-orbit imaging process, extracting each pixel coordinate in an image overlapping region between adjacent lenses and a corresponding gray scale response difference; performing on-orbit optimization fitting by taking the pixel coordinate as an independent variable and the gray scale response difference as a dependent variable to generate a dynamic compensation item for correcting on-orbit response drift; the adjacent lenses are divided into a reference lens and a target lens, and the dynamic compensation item is applied to the response of the whole image after the target lens is spliced, so that the response consistency correction of the target lens relative to the reference lens is realized. According to the invention, the gray continuity and the system-level radiation consistency of the image splicing area can be obviously improved.

The utility model relates to the technical field of nondestructive detection equipment, in particular to a multi-detector mounting rack. Comprising a base and a power mechanism, a supporting column is rotationally arranged on the base, the power mechanism drives the supporting column to rotate on the base, a supporting plate is fixed to the supporting column, detectors are arranged on the two sides of the supporting plate, and the positions of the detectors relative to the supporting plate can be adjusted up and down. The multiple detectors can be conveniently and rapidly switched, the detection device can conveniently cope with various different use scenes such as detection objects of different sizes and different materials, and therefore the detection efficiency is effectively improved.

The invention provides a multi-detector PGNAA element interested interval analysis method, and relates to the technical field of gamma-ray spectrum analysis, and the method comprises the following steps: irradiating a sample by using a neutron source, and obtaining gamma-ray spectrum and neutron flux by using multiple detectors; analyzing the reference characteristic elements of the characteristic peaks, and determining the uniform or non-uniform state of the sample according to the counting standard deviation of the characteristic peaks; and subdividing types in a non-uniform state, dividing interested intervals, adjusting the position of a detector, correcting an energy spectrum, calculating a weighted count, and finally calculating an element detection lower limit. By means of multi-detector state judgment, interval division, energy spectrum correction and the like, accurate analysis of the element interested interval of the non-uniform sample is realized, the detection accuracy is improved, and the element detection lower limit is reduced.

Systems and methods are described for transmitting information optically in free space. For instance, a system may include an optical signal generator to generate an amplified beam of light. A telescope transmits the amplified beam through the medium and receives an inbound beam of light. A detector system may include one or more (or multiple) detectors and a routing system that transmits the inbound beam to a selected set of detectors. In some cases, the system can determine a re-configuration condition based on control parameters and perform a system re-configuration to direct the inbound beam to a different set of detectors. In some cases, the system includes a remote fiber head or wavelength division multiplexing.

The invention relates to the technical field of detectors, and discloses a muon momentum reconstruction method based on particle tracks, which comprises the following steps of: 1, researching and developing an efficient energy detector, and processing position information of muons by adopting Kalman filtering and a REST framework in a gas time projection chamber so as to improve the energy measurement accuracy; 2, introducing a dynamic energy measurement algorithm, developing a self-adaptive algorithm, adjusting energy measurement parameters according to real-time feedback, optimizing muon energy estimation by using Kalman filtering, and reducing background noise influence at the same time; 3, realizing multi-detector array integration, designing a multi-detector array with reasonable layout, ensuring synchronous data acquisition, and enhancing the reliability of a measurement result by using cross validation; 4, data analysis is conducted through the machine learning technology, and a machine learning model is constructed and trained. According to the method, the energy of incident muons is estimated through Kalman filtering, the energy of the muons is screened when the muon scattering imaging technology is applied, and the imaging precision is improved.

The invention provides a multi-detector radioactive source positioning method and system based on a particle filter algorithm, and the method comprises the following steps: defining a to-be-monitored physical space as a search region, and building a radiation measurement model; randomly generating a particle set in the search area, wherein each particle comprises assumed radioactive source position coordinates and estimated activity parameters; a mobile platform carrying a plurality of radiation detectors is controlled to move in the area, the total count value of actual measurement of each detector is obtained, and the weight of each particle in the particle set is calculated by using the radiation measurement model and the actual measurement values; acquiring an environment background count value, calculating a ratio of an actual measurement value to a background value, and only when the ratio exceeds a preset signal-to-noise ratio threshold value, performing resampling on the particle set; judging whether the particle set meets a positioning ending condition or not, and if yes, determining a radioactive source positioning result by using the particle parameter with the highest weight and outputting the radioactive source positioning result; and if not, taking the weight gathering center as the next target position, and controlling the mobile platform to move towards the next target position.

This invention relates to a dual-embedded composite detection system, belonging to the field of electron microscopy technology. It effectively combines electron detection, EDS detection, and fluorescence detection, achieving simultaneous detection of the same location on the sample by multiple detectors, and efficiently collecting signals to obtain high-quality image information. The system includes: an electron source, an electron accelerating electrode, an objective lens, an EDS detector, a direct electron detector, a sample, a sample stage, and a control unit. Both the EDS detector and the direct electron detector are obliquely inserted inside the objective lens, with their probes close to the objective lens's detection port. The sample stage, the EDS detector, the direct electron detector, the electron source, and the objective lens are all connected to the control unit. The objective lens has a daguerreotype on its internal pole piece, and reflective cones are located at the bottom ends of both the inner and outer annular walls of the objective lens's detection port.

A multi-detector-based infrared detection system and method for multi-component insulating gas leakage belongs to the technical field of insulating gas leakage detection. It solves the problems of large size, high cost, low cost-effectiveness of existing devices and how to improve the infrared imaging detection effect. The present invention adopts a low-cost multivariate filter + infrared focal plane detector combination design for spectrometry and data processing to achieve simultaneous imaging detection of multi-component insulating gas, reduce equipment costs, and realize portable detection. The grayscale value obtained by the pixel point is matched with the current Gaussian mixture model, the weight parameter is updated, and the mean and variance of the model corresponding to the pixel point are updated. All models are re-sorted in order, and the model that meets the weight threshold is selected as the background. The current pixel point value is matched with the background model to determine whether it is the background or foreground. The gas diffusion display is enhanced by subtracting the complex dynamic background, improving the detection accuracy and automatically identifying the gas diffusion form.

The present invention provides a method for acquiring downhole acoustic signal by compressive sensing, which includes: obtaining a measurement matrix for sparse sampling of acoustic wave train signals of multiple detectors; performing data acquisition on the original signal through the sampling points determined by the measurement matrix to obtain sparse sampling data; and solving for the original signal based on the compressive sensing principle by combining the measurement matrix and the sparse sampling data. The sampling interval of the present invention is random and does not need to follow the Nyquist sampling theorem, greatly reducing the amount of data acquisition; moreover, sampling and compression can be regarded as being carried out simultaneously, and the Nyquist sampling theorem does not need to be followed during sampling and compression, and the original signal can be restored at the receiving end through a suitable reconstruction algorithm. Therefore, the present invention can avoid many problems in the existing signal processing mode; the present invention can greatly reduce the signal acquisition time and the amount of acquired data without loss of information, improving the efficiency of acoustic logging.

The present invention provides a CT-type spectrometer, comprising: a spectrometer housing for introducing reference light into the inside of the spectrometer; the light path assembly is arranged on the spectrograph shell and is used for guiding the reference light to the area array detector; the surface of the area array detector is divided into a reference light area and a signal light area, and the area array detector is used for synchronously receiving the reference light and the signal light emitted from the light path assembly; wherein after being adjusted by the light path assembly, the reference light enters the spectrograph through the hole and is incident to the reference light area, and the reference light and the signal light incident through the signal light path realize time and intensity synchronous detection on the area array detector. According to the embodiment, the same area array detector is used, the reference light and the signal light are collected on the same area array, and time and amplitude error steps among multiple detectors are greatly eliminated. Particularly, through the reconstruction of the spectrograph shell and the optimization of the light path, the complicated design of a time delayer is avoided, and a simple and low-cost synchronous triggering and noise reduction scheme is provided.

The present invention provides a rotary radar device and an identification method thereof, belonging to the technical field of sonar radar. The rotary radar device includes a floating box, a floating ring is fixedly installed on the bottom surface of the floating box, and a first equipment box is fixedly installed on the top surface of the floating ring. In the present invention, the low-frequency sonar detector is rotated by a motor to the optimal detection angle parallel to the water surface, so as to make full use of the penetration advantage of low-frequency sound waves in deep water areas and achieve effective identification of deep targets. When the whole device moves in water, the system precisely controls the angles of each detector through the motor, and sequentially activates the high-frequency, medium-frequency, and low-frequency sonar detectors to detect the shallow water, middle layer, and deep water areas respectively. Compared with traditional frequency-adjustable sonar, the present invention adopts a multi-detector configuration with fixed frequencies, and each independently transmits detection data back, effectively improving the identification accuracy of targets at different water depths and the data processing efficiency.

The invention discloses a multi-detector compatible high-integration SNSPD automatic control system, which is characterized in that an ultra-low-temperature part SNSPD receives an optical signal and outputs an electric signal pulse to a pulse preprocessing circuit, a low-temperature part is provided with a low-temperature amplifier, and the input end of the low-temperature amplifier is connected with the pulse preprocessing circuit; the room temperature part is provided with an SNSPD signal reading and processing module based on a single-chip microcomputer, the SNSPD signal reading and processing module amplifies signals transmitted in a low-temperature area, the signals pass through a comparator and then are connected to a counter, the single-chip microcomputer synchronously transmits data of the counter to an upper computer and a lower computer, meanwhile, the single-chip microcomputer controls a DAC to output SNSPD bias voltage, terminal voltage signals are read through an ADC, current flowing through the SNSPD is obtained through calculation, and the current is transmitted to the lower computer. The optimal working point of the SNSPD is dynamically and automatically maintained by detecting a critical current and an optical count value from a superconducting state to a normal state. The system has the advantages of multi-detector compatibility, high integration level, automatic control and the like.

Aspects of the disclosure relate to a method for understanding the response of any multi-detector device to activated oxygen. The method relies on an expression of a three-dimensional distribution of activated oxygen from fast neutron, and on the expression of three-dimensional gamma ray detection efficiency. A realistic model is derived for the signals measured in the detectors as function of the device-to-oxygen differential velocity.

The invention relates to an uncertainty-driven asteroid visual full-coverage intelligent decision planning method. The method comprises the following steps: initializing a multi-detector state and asteroid surface Fisher information conditional probability distribution; multiple constraints are considered, and a Fisher environment information gain is used for guiding multiple detectors to carry out trajectory planning and environment information acquisition; the Fisher information of the asteroid surface and the uncertainty distribution of the surface environment are continuously updated by utilizing the environment perception information; calculating rewards according to environment feedback, and performing detector detection path decision planning learning and decision model updating by using a reinforcement learning model; evaluating that the Fisher information entropy on the surface of the asteroid is wholly lower than a threshold value or the fuel budget is about to be exhausted, determining that the training process is ended, and storing a decision planning model; and testing an asteroid full-coverage decision planning model which is generated by training and is defined based on a Fisher information model and is driven by environmental uncertainty. According to the invention, the multi-detector based on Fisher information model uncertainty feedback carries out surface visual full-coverage path planning on the asteroid.

The application provides a self-adaptive smoke fire detection method suitable for ancient building environment, and relates to the technical field of fire detection, and comprises the following steps: collecting smoke concentration data of a smoke detector in an ancient building environment, removing invalid data by using an SPC statistical process control method to obtain an optimal data set; based on the optimal data set, calculating the correlation support degree between each smoke detector, and constructing a support matrix; the application effectively removes invalid data by using an SPC control chart, objectively evaluates the reliability of the detector based on the correlation support degree, dynamically integrates multi-sensor information by using a self-adaptive weighted fusion algorithm, and designs a trend threshold algorithm and a field model analysis algorithm for single detector and multi-detector scenes respectively, so that the fire determination strategy and the alarm threshold can be adaptively adjusted according to real-time environmental parameters and interference characteristics, the high sensitivity to real fire is retained, and frequent false alarms caused by traditional use of fire, ventilation airflow and humidity change are effectively inhibited.

Methods and systems are provided for a sample holder for a multi-detector quantitative microscopy system. In one example, the sample holder includes a frame with a central opening, a pivotable arm positioned adjacent to the central opening and having a whippletree assembly at a first end of the pivotable arm, and a movable ram, in contact with a second end of the pivotable arm, the movable ram configured to pivot the pivotable arm.

This invention discloses a violet-infrared flame detector system and its fault detection method based on multi-source information fusion and mutual verification, belonging to the field of fire alarm technology. The system includes multiple violet-infrared flame detectors and a system controller. Each detector stores orientation identification information and a list of adjacent orientations. The detectors form a verification network with detectors of the same orientation through a communication module and establish data exchange links with detectors of adjacent orientations. The data processing module uses statistical methods to calculate the mean and standard deviation of UV pulses in a reference group, constructs a dynamic confidence interval, and compares its own pulse count with the dynamic confidence interval. This invention effectively solves the problem of false alarms caused by interference from a single detector through multi-detector mutual verification, multi-spectral information fusion, and a system self-healing mechanism, significantly improving the reliability and safety of the flame detection system.

The invention provides an in-situ three-dimensional surface reconstruction method based on a scanning electron microscope, and relates to the technical field of material microscopic characterization analysis, and the method comprises the following steps: preparing a metal sample suitable for an in-situ mechanical test, fixing the metal sample on an in-situ test bed, and fixing the whole metal sample in a scanning electron microscope chamber; carrying out an in-situ mechanical test, and continuously collecting symmetrical four-region images of the surface of the sample at different deformation stages by using a four-region back scattering electron detector; extracting direction gradient information through a gradient calculation formula, and calculating a surface X / Y direction gradient matrix; and solving a three-dimensional height field sequence by adopting a regularization method to realize three-dimensional surface reconstruction in a dynamic deformation process. The invention innovatively provides a three-dimensional surface reconstruction algorithm based on multi-detector image fusion, solves the problem that the high-precision three-dimensional shape of any deformation area cannot be obtained in real time in an in-situ scanning electron microscope test, and supports cross-scale characterization. And the analysis capability of a surface microscopic deformation mechanism of the metal material under complex stress conditions such as stretching and fatigue is obviously improved.

The invention discloses a discontinuous distortion correction method based on data driving, and the method comprises the steps: collecting uniformly-distributed training data in a view field range through employing a precise angle measurement method, and enabling the training data to comprise image point distortion coordinates of a multi-detector splicing imaging system and corresponding ideal coordinates; constructing a multi-branch deep learning network model, wherein the multi-branch deep learning network model comprises a plurality of special branches, a fusion layer, a sharing layer and an output layer; preprocessing training data obtained by precise angle measurement, and training the multi-branch deep learning network model by using the preprocessed training data; and using the trained multi-branch deep learning network model to obtain the corrected coordinates of any input actual measurement coordinate point. According to the invention, the problem of difficulty in accurate representation of holographic distortion caused by optical distortion discontinuity and nonlinearity in a current multi-lens multi-detector splicing imaging system can be solved.

The invention relates to the technical field of data processing, in particular to a clock synchronization method and system for a multi-detector system. According to the scheme, after the detector receives the system clock signal, the synchronous signal in the system clock signal is detected, after the synchronous signal is detected, the synchronous counter in the detector stops timing, and after the periodic clock signal is detected, a new round of synchronous timing is restarted with the periodic clock signal as the reference. According to the scheme, only one cable is needed to transmit the system clock signal, then the synchronizing signal in the system clock signal is detected, clock synchronization of the multiple detectors can be achieved, finally the periodic clock signal is recovered, and the multiple detectors conduct time synchronization through the same periodic clock signal. Therefore, the cost and the pressure of cable arrangement are reduced, delay is avoided, and the measurement precision of the detector is further improved.

The present invention relates to the field of photoelectric detection and simulation test technology, and provides a method, system and device for simulating laser short pulse echoes for detection and tracking. The method comprises the following steps: obtaining the spatial orientation coordinates of several detectors and the spatial orientation coordinates of a laser galvanometer; according to the spatial orientation coordinates of the detector and the spatial orientation coordinates of the laser galvanometer, converting the spatial orientation coordinates of the detector into a local coordinate system centered on the laser galvanometer to obtain the detector coordinates; calculating the azimuth deflection angle of the laser galvanometer according to the azimuth deflection angle of the laser galvanometer; using a step-by-step timing circuit, with the galvanometer driving current parameters as a reference, sequentially driving the laser galvanometer to deflect, so that the laser pulse is captured by several detectors. The present invention can realize time-sharing multiplexing of a single laser source to multiple detectors through dynamic solution of spatial coordinates and precise control of the galvanometer, significantly improving resource utilization.

The invention discloses a cantilever beam photoacoustic gas detection device, and relates to the technical field of photoacoustic spectrum detection. The detection device comprises a multi-wavelength laser, a beam combining assembly, a lens, a roof-shaped prism, a photoacoustic cell with a built-in cantilever beam, a light splitting assembly and a plurality of detectors. Multi-wavelength laser beams are combined, converged through the lens and divided into two beams through the prism, the two beams irradiate the suspended detection end and the fixed frame of the cantilever beam respectively, gas absorbs laser energy to generate sound waves to drive the detection end to vibrate, dynamic interference fringes are formed, the light splitting assembly separates all wavelength fringes, and the multiple detectors collect signals synchronously. The cantilever beam photoacoustic gas detection device provided by the invention is used for improving the detection sensitivity.

The invention discloses a multi-detector data acquisition method, a coincidence processing method, a reconstruction method, a system, imaging equipment, electronic equipment and a storage medium. The multi-detector data acquisition method comprises the following steps: providing a unified memory pool for a plurality of detectors of imaging equipment; continuously receiving detection event data from the plurality of detectors; and writing the detection event data from the plurality of detectors into the unified memory pool according to the arrival time sequence. According to the scheme provided by the invention, time serialization writing and physical continuous storage of the data to the unified memory pool are realized, the calculation overhead of multi-path merging sorting is eliminated, the time complexity of data reading is remarkably reduced, and thus the data acquisition efficiency of a multi-detector system is remarkably improved.