74 results about "Neutron scattering" patented technology

The utility model discloses a collimation system of neutron nondestructive testing equipment, and aims to overcome the defects of poor shielding effect on neutron beams and poor scattering limiting effect on neutrons in the conventional collimation system. The utility model comprises: a first collimation body; a plurality of shielding layers are stacked on the first collimation body and the second collimation body to form a multi-layer structure; the neutron channel penetrates through the first collimation body and the second collimation body; one end of the neutron channel is an incident end, the other end of the neutron channel is an emergent end, a first reflecting layer is arranged on the inner wall of the neutron channel, and the first reflecting layer extends from the emergent end to the incident end. According to the collimation system of the neutron nondestructive testing equipment, the shielding effect on neutron beams is improved, neutron scattering is limited, and influences on the environment and personnel of a nondestructive testing site are avoided.

The invention relates to a neutron magnetic focusing device control system, and the system comprises a front-end sensing unit which is used for collecting the angle, temperature and other data of a neutron magnetic focusing device; the core control unit is used for realizing synchronous control and temperature protection of a motor and a neutron source T0 signal based on data acquired by the front-end sensing unit; the feedback compensation unit feeds back the equipment state in real time and dynamically compensates the phase deviation; the man-machine interaction unit supports local and remote dual-mode control; through cooperative work of multiple units, the system can realize high-precision synchronous control, real-time state monitoring and fault alarm, the operation stability and efficiency of a neutron magnetic focusing device are effectively improved, and reliable technical support is provided for a neutron scattering experiment.

The invention discloses a method, a system, equipment and a medium for evaluating the gas-bearing property of a water-flooded area, and the method comprises the steps: confirming three pieces of quantitatively measured skeleton information and fluid medium information in a time domain through different minerals and fluid components, and calculating a fast neutron scattering cross section according to pulse neutron logging data; carrying out qualitative identification on the gas reservoir by combining the fast neutron scattering cross section and the stratum hydrogen-containing index; according to the fast neutron scattering cross section, the thermal neutron capture cross section, the hydrogen content index and the respective volume content, a linear equation set is established, and the simultaneous equation set is solved to obtain the content of different fluid components in the stratum. The gas reservoir evaluation method solves the problem that a conventional gas reservoir evaluation method is seriously influenced by detection depth, borehole environment, invasion, low contrast ratio and pore fluid properties, and does not depend on conventional logging curves and electrical characteristics.

A method and apparatus for producing radioisotopes. The method includes generating fast neutrons by irradiating a neutron producing target with a deuteron beam from a deuteron accelerator. These fast neutrons directly irradiate a first sample. The fast neutrons that pass through the first sample undergo multiple-scattering by a neutron scattering material made of a light element positioned around both the neutron producing target and the first sample. This arrangement generates various radioisotopes simultaneously in large amounts from both the first sample and a second sample through nuclear reactions. The method enables production of multiple radioisotopes in a single process for applications in medicine, research, education, agriculture, and industry.

The utility model relates to the technical field of neutron scattering experimental equipment, in particular to a high-temperature and high-pressure sample environment device and a gas-liquid control device which are applied to an in-situ catalysis system of a neutron scattering technology. Comprising a gas cylinder, the gas cylinder is sequentially connected with a pressure reducing valve, a first screwing valve, a ball valve, a gas purifier, a first check valve, a first pressure sensor, a mass flow controller, a second check valve, a second screwing valve, a second pressure sensor and a three-way valve through pipelines, the lower surface of the three-way valve is connected with a bubbling tank, and the three-way valve is further connected with a reactor. One end of the reactor is connected with a liquid tank through an infusion pump; according to the invention, accurate control of experimental conditions is facilitated, in-situ catalysis research is realized, experimental efficiency and accuracy are improved, research in the fields of new materials and new energy is promoted, and the design of a tail gas treatment and collection device not only protects the environment, but also ensures the safety of the experimental process. Meanwhile, an accurate gas-liquid control system is also beneficial to reducing waste and pollution in the experiment process.

The utility model discloses an air suspension laser heating furnace for neutron scattering, which comprises a furnace chamber, a mounting platform and a base, a positioning laser, a first CCD (charge coupled device) camera and an optical position sensor are arranged on the mounting platform, and the positioning laser and the optical position sensor are matched with each other and are used for monitoring the suspension height of a sample in real time; an upper cover is arranged between the furnace chamber and the mounting platform, a heating laser, an infrared thermometer and a second CCD camera which penetrate through the upper cover are arranged at the upper end of the upper cover, and the second CCD camera is used for observing the state change of the surface of the sample; a suspension platform, a nozzle arranged on the upper end face of the suspension platform and an airflow system connected with the nozzle are arranged in the furnace chamber, the nozzle comprises a nozzle opening, and a plurality of capillary grooves are formed in the peripheral side of the nozzle opening; the airflow system is used for conveying airflow for suspension; and the nozzle is used for spraying out gas and suspended materials. According to the utility model, suspension heating is realized, and the heating temperature of 3000K can be provided for different material samples with the diameter of 3mm.

Provided is a highly accurate method for evaluating the abrasion resistance of rubber compositions. The present disclosure relates to a method for evaluating abrasion resistance of a rubber composition by X-ray scattering measurement or neutron scattering measurement, the method including performing X-ray scattering measurement or neutron scattering measurement in a region q expressed by the following Formula 1 to obtain a scattering intensity curve I(q), fitting the following Formula 2 to the scattering intensity curve I(q) to obtain a mass fractal dimension D, and evaluating the abrasion resistance of the rubber composition based on the mass fractal dimension D,q=4⁢π⁢ sin⁢ (θ / 2)λ(Formula⁢ 1)(e: scattering⁢ angle,λ: wavelength⁢ of⁢ x-rays⁢ or⁢ neutrons)I(q)∝q-D(Formula⁢ 2)(D: mass⁢ fractal⁢ dimension).

The invention relates to the technical field of additive manufacturing, and particularly discloses a device for in-situ research of a laser powder bed machining process, which comprises a sealed cabin, a three-dimensional motion system, a heating platform, a sample groove and a powder feeding mechanism, the heating platform is arranged on the three-dimensional motion system; the sample tank is detachably arranged on the heating platform; the sealed cabin is provided with an incident window, an emergent window, an observation window and a laser beam passing window, and films cover the incident window and the emergent window; a camera and an infrared thermal imager are arranged outside the sealed cabin; the device for the in-situ research of the laser powder bed processing process can be combined with a synchrotron radiation technology and a neutron scattering technology to realize real-time recording of transient information such as an organization structure and temperature of a processed sample, and helps to understand phenomena such as molten pool evolution, material phase change and a defect forming process in the laser powder bed processing process; the influence of different process parameters on the tissue structure and performance of the sample can be clarified.

The present application relates to a kind of neutron magnetic focusing device control system, system includes front-end sensing unit, for the angle of neutron magnetic focusing device, temperature and so on Data acquisition;Core control unit, based on the data of front-end sensing unit acquisition realizes motor and neutron source T0 Signal synchronous control and temperature protection;Feedback compensation unit, real-time feedback equipment state and dynamically compensates phase deviation;Man-machine interaction unit, support local and remote dual-mode control;Through the collaborative work of multiple units, system can realize high-precision synchronous control, real-time state monitoring and fault alarm, effectively improve the operation stability and efficiency of neutron magnetic focusing device, provide reliable technical support for neutron scattering experiment.

This invention belongs to the field of materials science and engineering, and relates to an NS-TNV40 neutron-transparent alloy for high-temperature neutron scattering experiments. The alloy's composition, by weight percentage, is 39.24% Ti, 39.24% Nb, and 21.52% V. Its preparation includes batching, melting, homogenization, and forging. The alloy has a theoretical melting point of 1716℃, exhibits no neutron diffraction peaks after holding at 1000℃ for 100 hours, and demonstrates excellent high-temperature stability. It maintains a single-phase structure without phase transformation after 100 hours of service at 1000℃. It also exhibits good high-temperature oxidation resistance, with oxidation weight gain lower than that of high-purity V and VNi alloys. Mechanically, it combines high strength and high plasticity. This alloy can avoid interference from the scattering signals of the sample container itself, improve the quality of neutron scattering data, meet the requirements of high-temperature in-situ experiments, and promote the development of high-temperature neutron scattering experimental technology.

The utility model provides a kind of neutron scattering can be realized internal probe high-precision switching system, including the scattering tank with cavity, first and second probe components;First probe component includes the first guide rail extending along first direction, first mobile platform, the first probe being arranged on first mobile platform, third guide rail and first drive component;Second probe component includes the second guide rail extending along second direction, second mobile platform, the second probe being arranged on second mobile platform and second drive component;First direction is consistent with the emission direction of particle beam and perpendicular to second direction;First drive component drives first probe to move along first direction;In first position, first probe is located at its working position;In second position, third, second guide rail is butt joint;Second drive component drives second probe to move along second direction;In third position, third, second guide rail is staggered;In fourth position, second probe is located at its working position, and probe switching can be realized.

The utility model provides an in-situ neutron scattering battery device suitable for electrode heating, which comprises a conductive shell, a heating element capable of heating an electrode and a temperature measuring element capable of monitoring the temperature of the electrode in real time are arranged in the conductive shell, one end of the conductive shell is provided with a fixed adapter, and the other end of the conductive shell is provided with a temperature measuring element. And a first shielding piece and a second shielding piece are respectively arranged at two ends of the conductive shell. According to the utility model, the heating element and the temperature measuring element are utilized to carry out heating temperature precision control on the electrode under the condition that an in-situ neutron scattering experiment is not influenced, so that the possible problem of temperature gradient in a traditional experiment is avoided; by arranging the first shielding piece and the second shielding piece, background signals in neutron scattering are isolated and reduced, and the test accuracy of the in-situ neutron scattering experiment of the electrode can be achieved.

The application relates to the technical field of neutron scattering experiments, and discloses a low-temperature coupling stretching device applied to neutron experiments and a testing method thereof. The low-temperature coupling stretching device applied to neutron experiments comprises a vacuum box, a clamping assembly, a cooling assembly, a loading assembly and a compensation assembly. The clamping assembly is arranged in the vacuum box, the clamping assembly comprises two oppositely arranged clamping heads, and the two clamping heads jointly clamp a sample to be measured. The cooling assembly is configured to cool the sample to be measured in the vacuum box. The output end of the loading assembly is connected with one of the clamping heads. The output end of the compensation assembly is connected with the vacuum box, so as to drive the vacuum box, the clamping assembly, the cooling assembly and the loading assembly to move in the direction away from the loading force applied to the sample to be measured by the loading assembly. The low-temperature coupling stretching device applied to neutron experiments can test the stretching performance of the sample in a low-temperature and vacuum environment, and can guarantee the accuracy of the test result.

A non-destructive inspection system includes: a neutron emission unit capable of emitting neutrons having a first neutron dose; a neutron detection unit capable of detecting a second neutron dose of neutrons scattered inside an inspection object A by the emission of the neutrons from the neutron emission unit; a gamma-ray detection unit capable of detecting a gamma dose of gamma rays released from the inspection object A by the emission of the neutrons from the neutron emission unit; and an analysis unit configured to calculate a content of a predetermined substance based on the gamma dose and correct the content of the predetermined substance based on the first neutron dose and the second neutron dose.

The application discloses a polarized neutron radio frequency flipper, and relates to the technical field of polarized neutron scattering. The polarized neutron radio frequency flipper comprises a shell, a first opening and a second opening are oppositely arranged along the length direction of the shell, a magnetic field generating device is arranged in the shell, the magnetic field generating device comprises a radio frequency magnetic field generating device for generating a radio frequency alternating magnetic field and a gradient magnetic field generating device for generating a gradient magnetic field. The radio frequency magnetic field generating device comprises a solenoid, the axis of the solenoid is arranged in line with the connecting line of the first opening and the second opening; the gradient magnetic field generating device comprises a first metal plate and a second metal plate, the first metal plate and the second metal plate are arranged on the two sides of the solenoid and are symmetrically arranged along the axis of the solenoid; the distance between the first metal plate and the second metal plate and the axis of the solenoid gradually decreases in the direction from the first opening to the second opening.

The present invention discloses a high-pressure container experimental device for neutron scattering, comprising: a cylinder, a sealing unit, a locking unit, a heating unit, a neutron absorption layer and a four-knife diaphragm. A window for neutron incidence and scattering is arranged on the side wall of the cylinder, a cavity for placing a sample tube is arranged in the cylinder, the sealing unit is used to seal the sample tube in the cavity, the locking unit is used to lock the sample tube in the cylinder, the neutron absorption layer is arranged on the outside of the heating unit, and the four-knife diaphragm is arranged on the side of the neutron absorption layer. In the above scheme provided by the present application, the setting on the locking device can ensure the loading and constant maintenance of the loading force; the setting of the window ensures the unimpeded passage of neutron incidence and scattering, and improves the neutron transmittance; the setting of the heating unit ensures that the sample reaches the required high temperature environment; the setting of the four-knife diaphragm and the neutron absorption layer respectively reduces the neutron beam spot and absorbs stray neutrons, and reduces the background of the sample diffraction spectrum.

The utility model relates to the technical field of neutron scattering, in particular to a neutron scattering sample environment device. The neutron scattering sample environment device comprises a first container, a second container and a connecting piece, the first container and the second container are provided with inner cavities, the inner cavities are used for being filled with paramagnetic materials, and the first container and the second container are used for being arranged at the first end and the second end of a sample tube respectively and are provided with heat conduction faces making contact with the sample tube to conduct heat. The connecting piece is connected between the first container and the second container so as to clamp and fix the sample tube. According to the neutron scattering sample environment device, the containers are provided with the inner cavities for containing the paramagnetic materials, the two containers are located at the two ends of the sample tube respectively and clamp and fix the sample tube, and the containers make full contact with the sample tube, so that heat conduction is facilitated; the whole device is put into a superconducting magnet, and the paramagnetic material is magnetized and demagnetized, so that an ultralow-temperature environment can be provided for a sample in the sample tube.

The present invention belongs to the technical field of oil and gas geological exploration, and specifically relates to a method for quantitatively dividing pore wettability in different pore size intervals of shale. The method is based on nitrogen physical adsorption and contrast-transformed small-angle neutron scattering technology. First, the pore volume of connected pores in the rock is determined by nitrogen physical adsorption. Then, the total pore volume, the pore volume of water-accessible pores, and the pore volume of oil-accessible pores are determined by contrast-transformed small-angle neutron scattering technology. Finally, a calculation model for the wettability of shale pores in different pore size intervals is established to quantitatively divide pores with different wettabilities, evaluate the wettability of shale reservoirs, accurately predict the volume proportions of pores with different wettabilities, and determine the wettability of pores in any pore size interval. This method solves the problem that the existing technology can only qualitatively and semi-quantitatively evaluate the overall wettability of shale, quantifies the heterogeneity of the wettability of shale reservoirs, provides a basis for predicting the flow patterns and occurrence locations of shale oil and formation water, and effectively improves the success rate of shale oil exploration and development.

The application discloses a kind of dispersion type fuel's thermal neutron scattering cross section calculation method and related device, belong to reactor material reaction cross section calculation technical field;The method first constructs the supercell of dispersion type fuel, calculates the Hellmann-Feynman force between each atom of supercell;And according to Hellmann-Feynman force, calculate phonon state density, mean square displacement matrix, dispersion relation and polarization vector;For the thermal neutron scattering law data calculation of fuel material, it can improve the accuracy of thermal neutron scattering law calculation, and then the theoretical value of thermal neutron scattering cross section is calculated;Finally, the actual experimental measurement value is compared with the aforementioned thermal neutron scattering cross section theoretical value, and the input parameters of thermal neutron scattering calculation are corrected according to the error of the two, and then the dispersion type fuel thermal neutron scattering cross section library with higher accuracy is obtained again by the corrected input parameters, and the calculation result is more accurate compared with the prior art.

The utility model belongs to the technical field of neutron scattering catalysis, and particularly relates to a neutron scattering high-temperature sample environment and gas control device. Comprising a gas control device, a pressurization control device, a high-temperature and high-pressure reactor and a tail gas treatment device, wherein the gas control device is sequentially connected with the pressurization device, the high-temperature and high-pressure reactor and the tail gas treatment device through pipelines in the gas flowing direction; the neutron scattering high-temperature and high-pressure sample environment and gas control device is comprehensive in function, flexible to operate, safe and reliable, and provides powerful tool support for research of an in-situ catalytic system.

Provided is a method of evaluating a concentration of sulfur in a polymer composite material. The present disclosure relates to a method of evaluating a concentration of sulfur in a polymer composite material by small-angle neutron scattering with 1H dynamic nuclear spin polarization.

The present invention discloses a collimation device and method for a multi-slit aperture in a neutron scattering spectrometer. The device includes an optical input end, an optical output end, a motion component connected to the multi-slit aperture, and a computer. The optical input end is used to output a laser beam, and the laser beam passes through one of the multi-slit apertures to the optical output end. The optical output end is used to form an image based on the laser beam. The computer is used to obtain the actual center position of the multi-slit aperture corresponding to each image according to each image, and control the movement of multiple motion components according to multiple actual center positions to adjust multiple multi-slit apertures to align with the actual center position of one of the multi-slit apertures as a reference. Thereby improving the relative position accuracy of multiple multi-slit apertures of the neutron scattering spectrometer, and further improving the measurement accuracy of the neutron scattering spectrometer.

The present invention relates to a method and system for detecting hollowing of heterogeneous space under steel plates based on a joint detection model. The method comprises the following steps: arranging a survey line on a steel-lined concrete structure, dividing the survey points at equal intervals along the survey line to form a grid, using an echo method to perform full-domain detection on each survey line, and collecting full-domain echo signals; obtaining a spectrum curve using fast Fourier transform according to the echo signal result, and screening the potential concrete hollowing defect area and hollowing area under the detection surface according to the spectrum curve; detecting the concrete hollowing defect area using a neutron scattering method, and collecting the thermal neutron count rate of each survey point on the survey line where the hollowing defect area is located; calculating the equivalent hollowing height value of each survey point according to the thermal neutron count rate result; and calculating the average hollowing height value by combining the hollowing area measured by the echo method and the equivalent hollowing height value measured by the neutron scattering method. The present invention can solve the problem that the accuracy and efficiency of hollowing detection of multi-layer heterogeneous space under steel plates in engineering cannot be taken into account at the same time.

The present application relates to a kind of based on graph neural network's neutron scattering experimental sample temperature field monitoring method, comprising the following steps: step one, research the attenuation law of high-energy particle environment to sample surface radiation energy, step two, construct the hyperspectral imaging model of sample surface radiation, step three, using multispectral radiation thermometry theory, complete the numerical reconstruction of sample surface temperature field under high-energy particle environment;Step four, combined with hyperspectral numerical image data, construct the surface temperature field measurement proxy model based on graph neural network;The purpose of the present application is to provide a kind of based on graph neural network proxy model's neutron scattering experimental sample surface temperature field monitoring method, realize the accurate measurement of sample surface temperature field under high-energy particle environment.

In the present invention, a target object is irradiated with a pulsed charged particle beam to generate neutrons with which a subject is irradiated, and as a result, the neutrons scattered at the subject are detected to determine the time of flight of each of the neutrons (step S5). The determined time of flight is corrected on the basis of delay time data for estimating a delay time related to the flight of each of the neutrons (step S6). The delay time data is obtained in advance on the basis of one or both of the pulse width of the pulsed charged particle beam and the deceleration characteristic of a moderator that decelerates the neutrons toward the subject (steps S1-S4).

This invention discloses a multi-channel collimation device for neutron diffraction, belonging to the technical field of neutron scattering spectrometers. The device includes a base, separating aluminum plates, and a detector. The base has an arc-shaped structure, with two bases arranged opposite each other. Each base has multiple mounting cavities spaced circumferentially on it. Each mounting cavity contains multiple separating aluminum plates spaced vertically, with a channel for the neutron beam to pass between adjacent separating aluminum plates. The detector is configured in a one-to-one correspondence with each channel. This multi-channel collimation device can optimize the neutron signal and reduce stray background signals, thereby ensuring the accuracy of experimental results.

Provided is a method for evaluating the wear resistance of a rubber composition with high accuracy. The present invention relates to a method for evaluating the wear resistance of a rubber composition by means of X-ray scattering measurement or neutron scattering measurement, said method being a method for evaluating the wear resistance of a rubber composition on the basis of a mass fractal dimension D, the mass fractal dimension D is obtained by curve-fitting a scattering intensity curve I (q), which is obtained by performing X-ray scattering measurement or neutron scattering measurement in a q region represented by formula (1), by formula (2). [Number 1] (Formula 1) # imgabs0 # [theta] is the scattering angle, and [lambda] is the wavelength of an X-ray or a neutron ray. [Number 2] (Formula 2) I (q) < q-DD: mass fractal dimension.

To provide a method for accurately evaluating the abrasion resistance of a rubber composition.SOLUTION: In a method for evaluating the abrasion resistance of a rubber composition by an X-ray scattering measurement or a neutron scattering measurement, the abrasion resistance of a rubber composition is evaluated on the basis of a mass fractal dimension D obtained by performing curve fitting using Formula 2 below on the scattering strength curve I(q) obtained by executing one of an X-ray scattering measurement and a neutron scattering measurement in a region q expressed by Formula 1 as below.SELECTED DRAWING: None

The invention provides an amorphous alloy deep supercooling in-situ online neutron scattering measurement method. The method comprises the following steps: adding a heterogeneous material for triggering nucleation of a sample into the sample in a suspended and deep supercooling state; performing neutron scattering measurement on the sample in the process; according to the method, the molten metal material can trigger nucleation at any deep supercooling degree, so that the amorphous alloy with different supercooling degrees is obtained, the microstructure and the dynamic behavior of the amorphous alloy in different deep supercooling states are accurately measured, the rapid solidification mechanism of the amorphous alloy is explored, and the method has the advantages of being simple in structure, convenient to operate and the like. In addition, in the process from nucleation triggering to measurement, the sample does not need to be moved, the influence on the sample in the transferring process can be eliminated, and in-situ online measurement of the amorphous alloy is achieved.

The invention discloses a fine collimator debugging method for a neutron time-of-flight spectrometer, which is applied to the field of neutron scattering science and technology, and comprises the following steps: acquiring diffraction intensity corresponding to left and right fine collimators at different positions when a first diffraction sample moves along a beam direction at a first preset step length, coarse debugging is carried out based on the deviation between the peak value corresponding position and the beam center position; obtaining diffraction intensity corresponding to the left fine collimator and the right fine collimator at different positions when the second diffraction sample moves at a second preset step length along the beam direction, and performing fine debugging based on the deviation between the peak value corresponding position and the beam center position; and acquiring the diffraction intensity of the third diffraction sample moving at a third preset step length along the beam direction and corresponding to the left and right fine collimators at different positions, and performing rotation debugging and synchronously correcting the residual tiny translation deviation based on the symmetrical distribution condition of the diffraction intensity relative to the beam center. According to the invention, the debugging precision of the fine collimator is effectively improved.