53 results about "Neutron scattering" patented technology

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 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.

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 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 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 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.

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.

The invention relates to the field of neutron scattering experiment materials, and provides a neutron diffraction peak-free anti-oxidation zero-coherence scattering alloy material with a single-phase BCC structure and suitable for a high-temperature neutron scattering experiment and a preparation method of the neutron diffraction peak-free anti-oxidation zero-coherence scattering alloy material. The alloy contains 37.07% of Ti, 59.95% of Ta and 2.98% of Al, the theoretical melting point is 1867 DEG C, no neutron diffraction peak exists, and the alloy can be used for preparing a sample containing container and a neutron beam window. The TiTaAl alloy has no neutron diffraction peak in an X-ray and neutron diffraction pattern, data interference can be avoided, and the quality of experimental data is improved. The TiZr alloy keeps high strength and high plasticity at a high temperature, and is suitable for a high-temperature experiment environment of 800 DEG C or above. After the material is oxidized for 80 hours in an atmospheric environment of 1000 DEG C, the oxidation weight gain is only 43mg / cm < 2 >, the oxidation resistance is excellent, and the reusability and economical efficiency of the material are improved; according to the method, accurate component control and efficient manufacturing are achieved by optimizing the steps of burdening, smelting, alloying, homogenizing treatment, forging and the like, the problems that an existing process is inaccurate in component control, low in efficiency, high in cost and the like are solved, and the product quality and the production efficiency are improved.

The utility model provides a sample collimation adjusting device for a neutron scattering rheological experiment. The sample collimation adjusting device comprises a first movement assembly, a second movement assembly, a third movement assembly and a diaphragm assembly. The second movement assembly is arranged on the first movement assembly, and the first movement assembly can drive the second movement assembly to move in the first axial direction. The third movement assembly is arranged on the second movement assembly, and the second movement assembly can drive the third movement assembly to move in the second axial direction. The diaphragm assembly is arranged on the third movement assembly, the third movement assembly can drive the diaphragm assembly to move in the third axial direction, and every two of the first axial direction, the second axial direction and the third axial direction are perpendicular. The diaphragm assembly comprises a diaphragm positioning sight bead, the diaphragm positioning sight bead is provided with a cross-shaped slit, the cross-shaped slit is used for allowing neutrons to pass through so that the neutrons can be clustered, the clustered neutrons can hit on a rheological sample of the rheological table, high-precision alignment is achieved, and the experiment effect is improved.

The utility model relates to the technical field of neutron scattering experiments, in particular to a perforated thickened metal foil heating body for a neutron scattering experiment. Comprising a first electrode plate, a second electrode plate, a niobium tube cover, a ceramic tube sleeve, niobium foil, a niobium ring and a ceramic cover, wherein the niobium tube cover is in the shape of a vertical sleeve, and a first electrode plate is welded to the top of the niobium tube cover; the second electrode plate is arranged on the periphery of the niobium tube cover in a sleeving manner, is positioned below the first electrode plate and is connected with the first electrode plate through a bolt; a ceramic tube sleeve is arranged between the first electrode plate and the second electrode plate; a niobium foil is welded on the inner surface of the niobium tube cover, and a niobium ring is welded at the bottom of the niobium foil; the bottom of the niobium ring is connected with a ceramic cover through a bolt; the heating body aims to provide an ultrahigh-temperature sample environment, and meets the urgent demand of neutron scattering experiments on high-performance heat source equipment by optimizing the structural design, lowering the experimental background, improving the heating efficiency and prolonging the service life.

The present invention relates to the technical field of spallation neutron sources, and discloses a rotary switching mechanism for a neutron scattering spectrometer, comprising a main body seat, a rotating cylinder, and a drive assembly. The rotating cylinder is rotatably disposed in the mounting cavity of the main body seat, and the rotating cylinder is provided with three through holes that completely penetrate along its axial direction. The three through holes can respectively give the neutron beam different characteristics, one of which can allow the neutron beam to pass normally, the second through hole can polarize the neutron beam, and the third through hole is provided with a multi-slit aperture plate to cause the neutron beam to diffract. The drive assembly is used to drive the rotating cylinder to rotate so that one of the through holes rotates to a preset position. When the through hole rotates to the preset position, the neutron beam can pass through the through hole and have specific characteristics. The rotary switching mechanism can realize the switching of different working modes through a rotating action. Compared with the horizontal movement switching in the prior art, this method reduces the overall volume and weight of the equipment, saving costs.

The invention discloses an in-situ monitoring device and an in-situ monitoring method for a mineral precipitation behavior in a fluid mixing reaction process, and belongs to the technical field of mineralogy monitoring. The device comprises a fluid injection and control system, a fluid mixing reaction device, a movably mounted sample table and an in-situ detection system (a microscopic optical detection device, a Raman detection device or a neutron emission and detection device). Sapphire wafer windows are arranged in front of and behind the fluid mixing reaction device, so that optical signals and neutron signals can penetrate through the sapphire wafer windows; the upper end of the fluid mixing reaction device is connected with a fluid injection system, and continuous and stable injection of fluid is controlled through a high-precision high-pressure injection pump; and the lower end of the fluid mixing reaction device is connected with a vacuum pump and a liquid outlet, so that a vacuum environment condition in the reaction device can be realized before reaction. The optical imaging method and the neutron scattering method can be used for monitoring mineral crystal nucleation and growth changes in real time, and full-size change monitoring of mineral nucleation and growth in the fluid mixing reaction process can be achieved.

The application provides a sample collimation method and device for neutron scattering rheological experiment. The adjusting table comprises a movement module and a diaphragm assembly. The diaphragm assembly is arranged on the movement module. The movement module can adjust the position of the diaphragm assembly in space, so that the neutrons or laser passing through the diaphragm assembly can accurately hit the sample on the sample table. The sample collimation assembly comprises a collimator. The center of the collimator is provided with a cross slit. One slit is arranged on each side of the cross slit on the collimator. The slits on the two sides of the cross slit are parallel to one of the slits of the cross slit. The intersection of the cross slit is used to determine the center height of the sample and the middle position of the sample cylinder. The slits on the two sides of the cross slit are used to determine the installation position of the rheometer. The device of the application can accurately collimate the sample position and the emission angle of the neutron beam, so that as many neutrons as possible hit the sample, and the experimental effect is improved.

The invention discloses a sample positioning method applied to a neutron diffraction spectrometer for measuring residual stress of a material or a workpiece, which is applied to the field of neutron scattering science and technology and comprises the following steps: aligning a to-be-measured point of a to-be-measured sample with cross laser by using an electric displacement table to finish coarse positioning of the to-be-measured sample; measuring equipment is adopted to detect the surface coordinates of the point to be measured, the surface coordinates of the point to be measured are aligned with the beam center coordinates through an electric displacement table, and fine positioning of the sample to be measured is completed; driving the to-be-tested sample to move along the beam direction at a preset step length by using an electric displacement table, recording diffraction intensities of the to-be-tested sample at different positions, and performing deviation compensation through the electric displacement table according to a deviation between a corresponding position of a diffraction intensity peak value and a theoretical position; and repeating the measurement and deviation compensation of the diffracted intensity until the to-be-measured point completely coincides with the beam center and the diffraction centroid. The method effectively improves the positioning accuracy of the to-be-measured sample when the residual stress is measured.

An automatic sample changing sample rod for a neutron scattering experiment comprises: a support rod, a first end of which is inserted into a sample tube from an opening of the sample tube and a second end of which is located outside the sample tube; the heat insulation part is arranged on the supporting rod in a sleeving manner; the sample seat is fixedly arranged at the first end; the sample seat is used for placing at least two samples, and the samples are arranged at intervals along the length direction; the fixing part is used for being connected with the cryostat and sealing the sample tube; the fixing piece is arranged on the supporting rod in a sleeving mode, the fixing piece and the supporting rod are mutually sealed at the connecting position, and the fixing piece and the supporting rod can relatively move in the length direction. The sample seat is provided with at least two samples which are arranged at intervals along the length direction, and the supporting rod and the fixing piece are in sealed movable connection, so that the sample corresponding to the neutron beam window in position can be changed by adjusting the relative position between the supporting rod and the fixing piece, the sample changing process is simplified, and the detection efficiency is improved.

The application discloses a frozen soil moisture-ice crystal distributed monitoring system based on neutron scattering and TDR combination. A synchronous trigger response module, optical fiber transmission and hierarchical sampling mode are adopted to realize accurate alignment in time dimension, and trigger delay is controlled within plus or minus 10 mu s. Through low-temperature modification, constant temperature control and lightweight shielding design, the adaptability of the system to special working conditions of frozen soil is improved, and long-term monitoring stability is ensured. The phase state of the application is clear, and the data dimension is complete. Total water is measured by neutron scattering, and unfrozen water is measured by TDR. The ice content is obtained by the difference between the two. Combined with the double calibration framework and error compensation algorithm, the quantitative measurement of the three elements of total water, unfrozen water and ice is realized. The application accurately solves the technical combination difficulty, realizes deep cooperation, solves the volume matching problem of two kinds of technical measurement through rigid positioning components, space calibration mechanism and deformation compensation design, and reduces the space correspondence error to less than 5%.

The invention discloses a sample temperature and humidity control experiment device of a small-angle neutron scattering spectrometer, which comprises a shell assembly, a heat preservation medium conveying mechanism and a reaction medium conveying mechanism, and is characterized in that the shell assembly comprises a shell, an incident window and an emergent window, the shell is provided with an incident port, an emergent port, an incident channel and a scattering channel, the incident window is installed at the incident port, and the scattering channel is installed at the emergent port; the emergent window is mounted at the emergent opening, the incident window, the emergent window and the shell jointly define a sample cavity, and a heat preservation space is further formed between the inner wall and the outer wall of the shell; the heat-insulating medium conveying mechanism circularly conveys a heat-insulating medium to the heat-insulating space; and the reaction medium conveying mechanism circularly conveys a reaction medium with preset temperature and humidity to the sample cavity. The heat preservation medium circularly flowing in the heat preservation space arranged around the sample cavity can avoid fluctuation of temperature and humidity in the sample cavity, ensure uniformity of the temperature and humidity in the sample cavity, avoid water vapor generated by condensation of the reaction medium due to temperature change, further avoid interference of humidity and improve accuracy of neutron scattering experiment results.