39 results about "Neutron imaging" patented technology

The invention discloses an element analysis device based on a high-yield DD neutron generator. The device is composed of a neutron source item system, a neutron shielding collimation wall, a detector shielding protection system, a detected sample system, a signal acquisition system and a data analysis system. A neutron beam is generated through (D, D) nuclear reaction and irradiates a sample after passing through a neutron moderation layer and a shielding collimation wall, so that the sample generates instant characteristic gamma rays. A shielding protection system with unique design effectively reduces background gamma ray interference and electromagnetic interference, and ensures that the detector accurately collects sample signals. By matching with an advanced signal acquisition and analysis system, the element components and content of the sample can be analyzed at high precision. In addition, the device can be combined with a neutron imaging system to obtain sample structure information. The method has great application potential in the fields of industrial production, scientific research and detection and the like, and can meet the requirements of high-precision element analysis on small-size samples.

The invention relates to the technical field of nondestructive testing of element content and uniformity of fuel elements, and provides a fuel element detection method and system based on neutron imaging and activation analysis. The detection method comprises the following steps: S1, installing a to-be-detected sample, and adjusting an imaging collimation hole to be aligned with a neutron beam current of a neutron source; s2, the thermal neutrons are collimated by the imaging collimation hole and then transmit the to-be-detected sample, and spatial distribution of uranium and poison elements of the to-be-detected sample is obtained through detection of a neutron imaging detector; s3, selecting a specific target area, switching the activation analysis collimation hole to align to a neutron beam of the neutron source, and adjusting the position of the to-be-detected sample, so that the specific target area aligns to the neutron beam of the neutron source; thermal neutrons bombard a specific target area after being collimated by the activation collimation hole, and are received by the gamma ray detector so as to analyze and obtain the element content of the specific target area. According to the method, distribution and content of uranium and toxic elements in the fuel element can be rapidly and accurately determined on the premise of nondestructive testing.

The invention relates to a method for measuring dendritic crystal orientation deviation of a single crystal blade through monochromatic neutron diffraction imaging, which accurately captures crystal structure information through neutron diffraction, can clearly obtain diffraction signals of different areas of the single crystal blade, and can accurately measure the orientation deviation of defective crystal grains through the steps of defect position determination, bright spot matching and the like. By utilizing the deep penetrability and volatility of neutrons, the interior of the blade can be detected under the condition that the single crystal blade is not damaged. Meanwhile, the neutron imaging detection range is larger than that of a traditional X-ray method, overall imaging of the single crystal blade can be achieved, operation such as data cutting and splicing is not needed, the result is more visual and accurate, and consumed time is shorter.

The application discloses an image processing method and device, electronic equipment and storage medium, and relates to the field of neutron imaging. The method comprises the following steps: acquiring an original image, wherein the original image is a sample image collected based on a neutron imaging mode; inputting the original image into an image processing model to acquire a noise image output by the image processing model, wherein the image processing model is a conditional generative adversarial network trained by using a sample sample image and a noise sample image of a standard sample with prior information; and generating a target image according to the original image and the noise image, wherein the resolution of the target image is higher than that of the original image. The technical scheme of the application combines a deep learning denoising method to perform denoising processing on the image, improves the image contrast, realizes the improvement of the spatial resolution of the image while using a relatively thin scintillator screen, and has high practicability, short time consumption and low cost in the process of generating a high-resolution image.

The invention belongs to the technical field of nuclear reactor engineering tests, and particularly relates to a rod bundle fuel assembly testing device. The device comprises a pressure channel, a simulation rod bundle arranged in the pressure channel, and a neutron imaging system arranged outside the pressure channel. The cross section of the pressure channel is in a regular hexagon shape, a lengthened pipe assembly is designed on the upper portion of the pressure channel, the simulation rod bundle is composed of a plurality of electric heating rods, and an outlet pipeline and an inlet pipeline are arranged at the upper end and the lower end of the pressure channel respectively and used for being connected with an external liquid metal loop. According to the invention, high-heat-flux heating of the reactor core can be simulated under the condition of liquid metal cooling, so that the thermal hydraulic phenomenon in the reactor core channel can be accurately simulated.

The utility model discloses a thermal neutron imaging detector based on a TFT area array detector, comprising a housing, a TFT substrate and a scintillator layer, the TFT substrate and the scintillator layer are both arranged in the housing, the TFT substrate comprises a substrate layer and an optical adhesive layer, the scintillator layer is arranged on the optical adhesive layer, and the scintillator layer is arranged on the substrate layer. The optical adhesive layer is matched with the scintillator layer to optimize optical signal transmission and improve imaging resolution; according to the TFT area array detector, the optical adhesive layer is arranged on the surface of the substrate layer of the TFT area array detector, and the optical adhesive layer is combined with the scintillator layer, so that optical signal transmission is optimized, and the imaging resolution is improved.

The invention relates to the technical field of neutron material shielding, in particular to a neutron shielding material and a preparation method thereof. Specifically, the composite material is prepared from the following components in parts by weight: 64 parts of AFG-90H, 36 parts of DDS, 0.3 part of functionalized MXene, 5 to 20 parts of Sm2O3 / RGO nano compound and 5 to 20 parts of APTES modified Sm2O3. According to the neutron shielding material disclosed by the invention, the components such as AFG-90H, DDS, functionalized MXene, the Sm2O3 / RGO nano-composite and APTES modified Sm2O3 are adopted by optimizing a formula, and an efficient preparation process is combined, so that efficient neutron shielding performance and good mechanical and thermal stability are realized. The simple and feasible preparation method and optimized formula parameters not only reduce the production cost, but also improve the performance of the material, so that the material has wide application prospects in the fields of nuclear facilities, neutron imaging equipment and the like, and has remarkable economic benefits and social benefits.

The application discloses a micron-resolved boron nitride neutron scintillator and a preparation method thereof. The preparation method comprises the following steps: taking an inch-level sapphire single crystal as a substrate, and selecting an aluminum polar surface as a growth surface; using a graphite clamp to fix the substrate, and putting the substrate into a chemical vapor deposition furnace; after vacuumizing, using a graphite heater to heat the furnace body to a reaction temperature; then, feeding raw gas and carrier gas N2 into the furnace, and decomposing the graphite clamp and the graphite heater at high temperature to provide a proper amount of carbon source, so that the gas mixture is reacted to deposit a crystalline boron nitride film on the substrate; using alcohol immersion to separate the boron nitride film from the substrate, fixing the boron nitride film on an aluminum plate after cutting, and manufacturing a neutron scintillator. The boron nitride film is dense and transparent, and exhibits strong blue light emission characteristics due to carbon defects, and can be used as a micron-resolved neutron scintillator. The micron-resolved boron nitride neutron scintillator is successfully realized, and the potential of the boron nitride neutron scintillator in high-resolution neutron imaging is verified.

The present invention discloses a method for quickly finding the position of fusion neutron incident points in the field of pulsed fast neutron imaging with high precision. All measured signals are classified into several sets, and the mapping relationship of the Hough transform is used to reconstruct the tracks of all signals in each set, and the positions of all neutron incident points are found. The present invention first classifies and segments the signals, so that the amount of data required for analysis is greatly reduced. All signals in each signal set can be cyclically exhausted and their tracks can be extracted, so that the operating speed of the system is greatly improved. In addition, the present invention adopts an optimized Hough transform algorithm in the process of realizing track finding, and finally obtains the neutron incident point, which can realize efficient and high-precision neutron incident point finding.

The invention discloses an imaging device based on a hexagonal boron nitride neutron imaging plate and a preparation method thereof, and the device comprises a neutron source, a collimator, a neutron imaging plate, a first reflector and an imaging device, and also comprises an excitation source which is used for emitting laser; the neutron imaging plate is an h-BN imaging plate and comprises a substrate and an h-BN film covering the substrate. The imaging device is a CCD (Charge Coupled Device) fluorescence imaging device; thermal neutrons emitted by the neutron source irradiate a to-be-detected sample, part of the thermal neutrons penetrate through the to-be-detected sample and then irradiate the h-BN imaging plate, thermal neutron irradiation damage defects occur, photoluminescence is generated under excitation of laser emitted by the laser source, and the photoluminescence is reflected to the CCD fluorescence imaging device through the first reflector to complete imaging of the to-be-detected sample. According to the invention, neutron current detection can be realized according to the boron vacancy defect of h-10BN and by utilizing the photoluminescence characteristic of h-10BN, the gamma sensitivity is low, the device process is simple, and the neutron measurement cost is reduced.

The invention relates to a neutron imaging data reconstruction system and method, efficient data acquisition, processing and image reconstruction are realized by integrating multiple functional modules and a data processing technology, each functional module of the system is effectively separated through modular design, and meanwhile, the functional modules can be highly integrated; and automation and high efficiency of the whole process from data acquisition to image reconstruction are realized. According to the method, the processing flow of the neutron imaging data is optimized, and the data processing time is remarkably shortened. Through standardized design of software and hardware interfaces, seamless integration between different hardware devices and software modules is realized. A user can efficiently use the system to collect, process and analyze experimental data, and a high-quality neutron imaging image is generated.

The invention discloses a neutron grating, a preparation method thereof and imaging equipment, and belongs to the technical field of neutron imaging. The method comprises the following steps: obtaining a composite structure containing a silicon substrate, a chromium layer and a photoresist layer which are sequentially laminated, exposing and developing the photoresist layer to form a photoresist pattern, soaking the exposed and developed composite structure in an etching solution to etch the chromium layer to form a chromium mask layer, and carrying out plasma etching on the silicon substrate to form a silicon-based grating structure. Multistage line width reduction is carried out through exposure development, etching liquid etching and plasma etching, and a silicon-based grating structure with a high aspect ratio can be obtained. Inclined evaporation is carried out on the silicon-based grating structure, the neutron absorbing material can be directly deposited on the side walls of the grooves, the probability of forming holes in the side walls of the grooves is reduced, the silicon-based grating structure does not need to be pressed and placed in a high-temperature environment, and finally the neutron grating which is good in structural stability and compactness and high in depth-to-width ratio is obtained. And the imaging precision of the imaging equipment can be improved.

The invention relates to the field of nuclear technology and automatic detection, and provides a high-precision automatic sample change detection device for mass neutron imaging experiments and an experiment method. The device comprises a sample library system and an automatic sample switching system, the sample library system can store and manage at least 200 sample boxes, and the automatic sample switching system adjusts the sample boxes to an experiment area and returns the sample boxes; the two systems work cooperatively, batch parallel processing of hundreds of samples is achieved, the problem of difficulty in automatic sample replacement of a large-batch sample experiment is solved, the experiment efficiency is improved, and the consistency and reliability of experiment data are ensured; the device runs fully automatically, experimenters are liberated, and the utilization efficiency of human resources is improved; and the device is suitable for samples of different sizes, wide in applicability, capable of improving the experiment efficiency by 70%, convenient for classified storage and management of the samples, suitable for various neutron line stations, and high in universality and economical efficiency.

[Problem] To provide a technique capable of visualizing, with high spatial resolution in neutron imaging, the internal structure of an object to be inspected, without performing chemical treatment that is required when a nuclear emulsion is used. [Solution] A neutron position recording device 10 is provided with a conversion film 1 and a fluorescent nuclear track detector 2 in order to generate an image representing the fine structure of an object T to be inspected. When each neutron that has passed through the object T to be inspected is incident, the conversion film 1 converts each neutron into a charged particle. The fluorescent nuclear track detector 2 has a surface 2a facing the conversion film 1, and records, due to the incidence of the charged particle from the conversion film 1, the track of the charged particle corresponding to the position of the neutron.

The present invention provides a moderator and collimator for thermal neutron imaging, capable of providing high-flux, well-directional thermal neutrons for neutron imaging equipment such as mobile neutron radiography systems and neutron therapy devices. The moderator and collimator comprises a uniform moderator, a hole array moderator, and a hole array collimator, which are sequentially connected in a first direction; and a neutron reflector surrounding the uniform moderator, the hole array moderator, and the hole array collimator. The uniform moderator comprises at least one neutron moderating material. The hole array moderator comprises a plurality of first holes extending in a two-dimensionally closely spaced arrangement along the first direction, the hole array moderator having hole walls made of neutron moderating material. The hole array collimator comprises a plurality of second holes extending in a two-dimensionally closely spaced arrangement along the first direction, the hole array collimator having hole walls made of neutron absorbing material. The neutron reflector extends in the first direction and is attached to and wrapped around the uniform moderator, the hole array moderator, and the hole array collimator. The neutron reflector comprises at least one neutron reflecting material.

The present invention discloses a fast neutron imaging detector and an imaging method based on a chlorine-containing halide scintillation screen. The fast neutron imaging detector includes a fast neutron scintillator conversion screen, an optical path system for collecting and reflecting the scintillation fluorescence emitted by the fast neutron scintillator conversion screen, and a detection imaging system. The imaging object is located in front of the fast neutron scintillator conversion screen, the optical path system is located behind the fast neutron scintillator conversion screen, and the detection imaging system is located on the side of the optical path system. The fast neutron scintillator conversion screen of the present invention comprises a chlorine-containing copper-based halide perovskite Cs5Cu3Cl 8‑x I x , and the fast neutron scintillator conversion screen is based on 35 the Cl(n,p) nuclear reaction to detect fast neutrons. Compared with the nuclear recoil method, 35 the Cl(n,p) nuclear reaction generates secondary protons with a smaller average energy and better monochromaticity for fast neutrons with the same incident energy, resulting in a smaller fluorescence diffusion distribution, and thus a better imaging spatial resolution is obtained.

The invention discloses a neutron image restoration method and system based on conditional DDPM, and the method comprises the following steps: designing a neutron image multi-channel degradation strategy according to an image degradation source in a neutron imaging process; constructing a neutron image degradation model according to the neutron image multi-channel degradation strategy; obtaining a plurality of reference neutron images, and generating corresponding degraded neutron images by using the neutron image degradation model to obtain an image training data set; performing model training based on a conditional DDPM model by using the image training data set to obtain a sub-image restoration model; acquiring an original neutron image, and inputting the original neutron image into the neutron image restoration model to obtain a neutron image restoration result; the device can be applied to the technical field of neutron photography, and solves the technical problem that the neutron flux and the collimation ratio are limited when the compact neutron photography technical field is applied, so that the quality of a neutron photography image is reduced.

A neutron imaging system that includes a central neutron source configured to produce source neutrons, wherein the central neutron source comprises a beam target, a moderator chamber surrounding at least a portion of the beam target, the moderator chamber housing a moderator, and a re-entrant cone extending into the moderator chamber. The re-entrant cone includes an entrance surface facing the beam target. The entrance surface encloses a cone chamber, isolating the cone chamber from the moderator. Furthermore, the entrance surface is shaped such that source neutrons produced at the beam target impinge the entrance surface with a neutron flux that varies by 10% or less along the entrance surface.

The present application relates to the technical field of neutron imaging, and discloses a gamma ray suppression neutron imaging system based on a boron nitride scintillation screen and application thereof, the neutron imaging system comprising a boron nitride scintillation screen, an optical path system, and a camera, the boron nitride scintillation screen being located in front of the optical path system and installed at the position of a neutron incident window, the optical path system being connected with the camera, the optical path system being provided with different optical path units according to a high-flux neutron beam source, a low-flux neutron beam source, and a long-distance neutron imaging, and the camera being used for receiving scintillation light processed by the optical path system and recording photon information. The neutron imaging system can reduce background signals caused by gamma rays, thereby improving the signal-to-noise ratio, making the obtained image clearer, reducing noise and artifacts, improving the imaging quality and detection accuracy of the image, and having important application potential in the fields of high-energy physics experiments and industrial detection.

The invention relates to the technical field of neutron imaging, and discloses a system and a method for researching a concrete pouring process by using a neutron imaging technology.The concrete pouring simulation device comprises a support, a concrete container is supported on the support, a pouring opening is formed in the top of the concrete container, and a funnel is further supported on the top of the support; an electric two-way ball valve is arranged at an opening in the bottom of the funnel, the opening and the pouring opening are coaxially arranged, the electric two-way ball valve is connected with a controller through a wire, and the controller is carried to leave the neutron imaging detection chamber to control concrete pouring; the neutron imaging device comprises a device base used for supporting the support, a neutron source on the neutron imaging device is opened, neutrons can be emitted in the direction of the concrete container, and the neutron imaging device can obtain neutron images in the concrete pouring process. The remote control type concrete pouring device is used for a neutron imaging test, the spatial and temporal distribution of moisture in concrete can be synchronously detected, the observation efficiency of neutron imaging can be remarkably improved, and the remote control type concrete pouring device has high practicability.

This invention relates to the field of well logging technology, specifically to a thermal neutron imaging well logging method and apparatus. The method includes: generating a neutron count rate curve; determining the neutron lifetime at which the neutron count rate curve cuts off based on the curve; and determining the formation boundary based on the neutron lifetime. This application improves the accuracy of formation detection.

The invention relates to an industrial part defect detection method fused with a neutron imaging technology. The method comprises the following steps: acquiring an original neutron image based on low-dose neutron source imaging and preprocessing the original neutron image; carrying out preliminary restoration by using an image reentry network; extracting a structure edge graph; generating a high-quality restored sub-image based on the intermediate restored image, the text prompt and the structure edge graph by adopting a condition-guided diffusion model with a VAE encoder; and based on the obtained high-quality restored sub-image, a defect detection algorithm based on deep learning is used to realize automatic identification and positioning of key defects such as cracks, pores, inclusions and the like. According to the method, high-quality images and detection result support can be provided for the subsequent automatic defect detection process of industrial parts under the low-dose and low-cost imaging conditions.

The application relates to a neutron radiography device and method applied to the detection of damaged nuclear fuel assemblies, wherein the neutron radiography device comprises a neutron source, a shielding cover and a neutron imaging system arranged in a shielding environment respectively, the upper parts of the two sides of the shielding cover are respectively provided with a neutron beam inflow port and a neutron beam outflow port, the neutron source is close to the neutron beam inflow port, and the neutron imaging system is close to the neutron beam outflow port. Advantages: under the condition that the fuel assembly is not disassembled, the damaged fuel rods in the fuel assembly can be quickly and accurately identified, the operation is simple, and the detection is fast; whether the fuel rods are damaged can be identified by analyzing whether an image of water vapor is formed at the air cavity part, all the damaged fuel rods in the assembly can be detected through the images of two visual angles, and the detection time is greatly shortened.

The utility model discloses a neutron generation system, a neutron imaging integrated device and a neutron imaging integrated system. The neutron imaging integrated system comprises a neutron imaging integrated device and at least one CCD camera, and the neutron imaging integrated device comprises a neutron generation system used for generating neutrons, a first detector and a second detector. The neutron generation system comprises a first beam outlet along a first direction and a second beam outlet along a second direction; the first detector and the first beam outlet are oppositely arranged, and a first to-be-detected position is formed between the first beam outlet and the first detector; and the second detector is opposite to the second beam outlet. The neutron imaging integrated system has use scenes and advantages of a thermal neutron imaging system and / or a fast neutron imaging system and a neutron back scattering imaging technology, is wider in application field, can be selectively switched according to a detection object and a detection scene in an outdoor nondestructive detection operation process, and is higher in working efficiency.

The utility model discloses a neutron imaging detector with gamma compensation based on a linear array detector, which comprises a PCB (printed circuit board), a fixing plate and a scintillator layer, and is characterized in that the fixing plate is positioned on the PCB and is used for fixing the scintillator layer; a pixel acquisition layer is arranged between the scintillator layer and the mounting part of the fixed plate; high-precision signal acquisition is realized by taking linear array photodiodes in one-dimensional arrangement as a pixel acquisition layer, a scintillator layer is formed by alternately distributing and mutually fitting a plurality of pieces of 6LiF glass and 7LiF glass, one photodiode is arranged below each of the 6LiF glass and the 7LiF glass, and a shading layer is arranged between the 6LiF glass and the 7LiF glass; as the 6LiF glass and the 7LiF glass are the same in area and thickness, the intensity of X-rays and gamma-rays in the 6LiF glass and the 7LiF glass is the same, neutrons, the X-rays and the gamma-rays can be detected by matching the 6LiF glass with the photodiode, and only the X-rays and the gamma-rays can be detected by matching the 7LiF glass with the photodiode, so that the X-rays and the gamma-rays can be deducted by subtracting detection data of the 6LiF glass and the 7LiF glass. The purpose of neutron detection imaging is achieved.

The present application relates to the technical field of neutron imaging and tomographic reconstruction, and particularly relates to a three-dimensional reconstruction method, system and device for low-yield and few-angle neutron imaging and a storage medium. The technical scheme comprises obtaining neutron imaging projection data of a sample to be measured at multiple rotation angles to form a projection sequence; preprocessing the projection sequence, wherein the preprocessing comprises normalization, angle uniform sampling, spatial clipping and resolution uniform resampling to obtain standardized projection data; calculating an artifact evaluation index based on the standardized projection data, and adaptively suppressing artifacts of the standardized projection data according to the artifact evaluation index to obtain corrected projection data. Through the organic combination of preprocessing, adaptive artifact suppression, DiffNeuVox voxel optimization reconstruction, ROI constraint and post-processing, the structural clarity, noise resistance and usability of the three-dimensional reconstruction result of low-yield and few-angle neutron imaging are significantly improved.

The invention provides an internal emission neutron imaging method based on a photo-nuclear reaction, and belongs to the field of neutron imaging. The method comprises the following steps: directionally irradiating a sample with photons of which the energy is higher than a sample nuclide reaction threshold value, triggering a photo-nuclear reaction, and detecting neutron signals at different penetration depths of the sample; adjusting photon energy, detecting neutron signals at different penetration depths of the sample again, calculating a neutron signal difference value at different penetration depths, and calculating a ratio of the neutron signal difference value at different penetration depths to the neutron signals; imaging the sample according to the ratio of the difference value of the neutron signals at different penetration depths to the neutron signals; the invention further provides an internal emission neutron imaging system based on the photo-nuclear reaction. The problems that existing neutron imaging is low in neutron utilization rate and low in imaging sensitivity due to interference of scattered neutrons are solved.

The present application relates to the technical field of neutron imaging and detection, in particular to a data processing method for a neutron imaging detector based on microchannel plates (MCP), and more particularly to a waveform analysis and event reconstruction algorithm for white-light neutron resonance imaging; comprising a waveform analysis step and an event reconstruction step, wherein the waveform analysis step uses advanced waveform recognition technology to perform offline analysis on the signal waveforms on the anode plate of the neutron imaging detector, accurately identifying the signal waveform of each electron group; the event reconstruction step is based on the waveform analysis results, grouping and pairing the signals, and constructing an accurate position reconstruction model to obtain the accurate coordinates of the electron group hit position; not only improves the imaging accuracy and count rate, but also optimizes the data processing flow, adapts to high count rate conditions, improves the overall performance of the system, and expands the application field, which will provide strong support for the development and application of neutron imaging technology.

The utility model provides a fast neutron imaging detector and a detection system, and belongs to the technical field of nuclear imaging detectors. The fast neutron imaging detector comprises a substrate, a scintillator assembly and a photomultiplier. Wherein the substrate is provided with a plurality of through holes, and the plurality of through holes form an array. The scintillator assemblies are arranged in the through holes in a one-to-one correspondence mode, and each scintillator assembly comprises a scintillator and a light guide piece which are arranged in a stacked mode. And the photomultiplier is electrically connected with the light guide sheet in the scintillator assembly. The detector is flexible in design of the area and the spatial resolution, resistant to mechanical impact, high in reliability, stable in performance, low in cost and convenient to debug and overhaul, and the maintenance cost of equipment is reduced.