117 results about "Neutron generator" patented technology

The invention discloses a pulsed neutron generator control system based on LabVIEW, and the system comprises a neutron generator industrial personal computer which operates a virtual human-computer interaction interface developed based on LabVIEW; the console core board carries a DSP main control chip and is embedded into a real-time operating system; the driving sampling board is connected with the console core board and is integrated with a signal conditioning circuit; the neutron generator industrial personal computer communicates with the console core board through a Modbus protocol, and controls and drives the sampling board to output control signals of the three independent power supply ion sources, the storage and the acceleration pole to the neutron tube; wherein the console core board generates three paths of PWM signals with the PWM frequency of 2.5 kHz and the step length of 8191, and the three paths of PWM signals are converted into analog control signals through the driving sampling board. According to the control system, the PWM control precision is greatly improved, the voltage control precision is improved to 0.012% (100% higher than that of a conventional scheme) through the combination of the 8191 step length (13-bit resolution) and the 2.5 kHz frequency, and the neutron yield fluctuation is controlled within + / -1.5%.

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 yield control, in particular to a neutron generator yield control method and system. The method comprises the following steps: establishing a polynomial model by using historical yield data to predict a target efficiency attenuation factor; dynamically determining neutron event boundaries in the pulse integral value and the pulse width two-dimensional characteristics based on the attenuation factor, and counting the neutron event boundaries; the yield deviation and the change rate are calculated, and when the deviation exceeds a threshold value, feedforward compensation is carried out on the target yield; and selecting a three-dimensional lookup table, an input deviation, a change rate and a current high voltage according to the interval to which the attenuation factor belongs, and cooperatively determining the adjustment amount of the ion source current and the accelerator high voltage. According to the scheme, the measurement and control problems caused by aging of the target piece can be solved, and the precision, the response speed and the long-term stability of yield control are improved.

The invention relates to the technical field of data processing, and discloses a digital feedback dynamic adjustment method and system for a neutron generator control signal, and the method comprises the steps: calling a reconfigurable waveform parameter set corresponding to a target neutron from a mapping relation according to the yield and beam spot characteristic demands of the target neutron; generating a basic high-frequency pulse sequence of the neutron tube, and performing pre-distortion filtering on the basic high-frequency pulse sequence to obtain a high-frequency pulse sequence of the neutron tube; collecting an anode current and a target voltage signal of the neutron tube applied with the high-frequency pulse sequence during operation, and converting the anode current and the target voltage signal into a digital feedback current; comparing the digital feedback flow with a reference waveform in the reconfigurable waveform parameter set in real time to obtain an error correction amount of the high-frequency pulse sequence; dynamically adjusting the high-frequency pulse sequence according to the error correction; applying the dynamically adjusted high-frequency pulse sequence to a corresponding electrode in a neutron tube through power; the neutron tube control signal processing efficiency can be improved.

The invention relates to the technical field of communication, in particular to a neutron generator communication protocol optimization method and system. The method comprises the following steps: acquiring operation parameters and change rate of a neutron generator to construct a composite state vector; calculating the abnormal score of each parameter and carrying out weighted summation to obtain a comprehensive risk index; dynamically dividing core and non-core parameters according to the index, and adjusting an updating period of the non-core parameters; and for the high-correlation core parameters, only transmitting complete data of one reference parameter and differential values or prediction residual errors of other parameters, and constructing a communication data frame. According to the scheme, the risk can be dynamically evaluated, the data transmission strategy is intelligently adjusted, and the communication efficiency is remarkably optimized while the early warning reliability is improved.

The invention relates to the technical field of steel smelting scrap steel briquette treatment, and particularly provides a neutron generator-based scrap steel briquette component online detection device and method. Neutrons generated through nuclear reaction of a neutron generator are absorbed and activated with elements such as Fe in the scrap steel, gamma rays with characteristic energy are emitted, then the energy intensity of the gamma rays is observed, contrasted and calibrated from the response of a detector, and therefore the content composition and the content proportion of all the elements, mainly the Fe element, in the scrap steel briquette are calculated, analyzed and determined. The device effectively avoids the low-quality employment risk in the detection of the scrap steel briquettes, solves the problems that the detection of the internal quality of the scrap steel briquettes is difficult, time-consuming and labor-consuming, remarkably improves the working efficiency and effect, and has remarkable economic benefits and popularization prospects.

A system and a method for a pulsed neutron logging tool. The pulsed neutron logging tool may include a pulsed neutron generator for generating one or more neutrons, one or more gamma ray scintillator detectors disposed in a detection area, a shielding block that separates the pulsed neutron generator from the one or more gamma ray scintillator detectors, and a shielding layer. The pulsed neutron logging tool may further comprise an information handling system communicatively connected at least in part to the pulsed neutron logging tool. The information handling system is configured to create a gamma ray spectrum from the one or more gamma rays detected by the one or more gamma ray scintillator detectors, remove a background from the gamma ray spectrum to form a peaks-only spectrum, and compare one or more peaks-only elemental standards to the peaks-only spectrum to determine an elemental weight and yield.

The invention relates to the technical field of data calibration, in particular to a neutron fluence response calibration method based on a neutron generator reference radiation field, and the method comprises the steps: collecting a counting rate and a neutron fluence rate at each moment in each monitoring period through a neutron detector and a neutron generator; data of each environmental parameter around the reference radiation field at each moment in each monitoring period are obtained; recording each monitoring period and a plurality of monitoring periods before the monitoring period as historical periods; determining the measurement error of each historical period; obtaining the measurement interference degree of each environmental parameter in each monitoring period; and calculating the scattering interference degree of each environmental parameter in each monitoring period to obtain a calibration counting rate, and carrying out real-time calibration on the neutron fluence response. According to the invention, the interference influence of different environmental factors on the measurement result of the neutron detector can be quantified through dynamic environmental changes, the measurement result of the neutron detector is calibrated in real time, and the measurement accuracy of neutron fluence response is improved.

This invention discloses a conveniently detachable, actively water-cooled solid-state deuterium target based on a compact neutron source, comprising a micron-sized solid titanium film, a titanium film carrier, and a water-cooled substrate. Deuterium is deposited in the solid titanium film by bombarding it with a deuterium ion beam, and neutrons are generated by collisions with the subsequent deuterium ion beam. Oxygen-free copper, with its high thermal conductivity, is used as the carrier for the titanium film. The threaded structure on the side of the titanium film carrier allows for convenient installation and removal from the water-cooled substrate. The oxygen-free copper substrate, with multiple annular water-cooling structures inside, enables rapid and effective removal of heat flux from the target, preventing deuterium particles deposited in the solid titanium film from desorbing due to excessive temperature, thus avoiding impact on neutron yield. This invention provides a conveniently detachable, actively water-cooled solid-state deuterium target suitable for compact deuterium-deuterium neutron generators, providing a sound technical foundation for the widespread application of compact accelerator neutron source systems in production and daily life.

A rotating target high yield compact D-D neutron generator disclosed by the present invention comprises an ion source unit, a vacuum main body unit and a target unit, the ion source unit generates a deuterium ion beam, the deuterium ion beam is introduced into a vacuum chamber and passes through a leading-out accelerating electrode for acceleration, and the accelerated deuterium ion beam bombards the circumferential target surface of a molybdenum target to generate a deuterium ion beam. And deuterium-deuterium fusion reaction with deuterium nuclei injected into the molybdenum target in advance is carried out, fast neutrons are released, and the neutron yield is improved. The rotating driver of the target unit drives the molybdenum target of the cylindrical structure to rotate through the insulating rotating shaft, the molybdenum target rotates to distribute beam power to the circumferential target surface of the molybdenum target, a cooling medium is conveyed to one side of the inner side wall of the molybdenum target in combination with the cooling channel, the molybdenum target is cooled, and the service life of the target unit can be effectively prolonged. The leading-out accelerating electrode is located in the vacuum cavity, operation of the vacuum main body unit is not affected by external humidity and temperature environment conditions, high-voltage ignition discharge can be effectively restrained, and the safety performance of a high-voltage electric field is improved.

The invention discloses a detection control device, a detection control method and a petroleum logging neutron tube system. The detection control device comprises a radio frequency power supply, an impedance matching module, a filtering module, a current detection module and a control module, the radio frequency power supply is used for providing radio frequency energy for the radio frequency electrode, so that working gas in an ion source in the neutron generator generates plasma; the current detection module is used for providing direct current voltage for the radio frequency electrode and detecting information of direct current flowing through the radio frequency electrode; the filtering module is used for preventing radio frequency energy from entering the current detection module and preventing direct current from entering the radio frequency power supply; the control module is used for controlling the output power of the radio frequency power supply according to the direct current information. According to the detection control device, the detection control method and the petroleum logging neutron tube system, the density of plasma in the neutron generator can be obtained in real time, a stable and reliable feedback signal is provided for output power control of a radio frequency power supply, and the stability of neutron output is ensured.

The invention discloses a control method and device of a material moisture online monitoring system and a storage medium, and relates to the technical field of material moisture monitoring, and the method comprises the steps: starting a neutron generator assembly, and starting a neutron detector assembly and a gamma detector when the starting duration of the neutron generator assembly is greater than or equal to the preheating preset duration; based on a detection result of the neutron detector assembly, determining an accumulated scattering neutron share of the detected material, and obtaining a corresponding target hydrogen density matched with the accumulated scattering neutron share from a preset association library; based on a gamma detector, counting the monitored gamma rays in a classified manner according to the pulse amplitude, generating a gamma-ray energy spectrum, and extracting a water hydrogen characteristic peak area from the gamma-ray energy spectrum; according to the target hydrogen density, the water-hydrogen characteristic peak area and the energy spectrum calibration coefficient of the gamma-ray energy spectrum, the curing hydrogen ratio is determined; and determining the free water content of the detected material according to the cured hydrogen ratio. According to the invention, through dual-mode cooperative detection, the problem of low accuracy of moisture monitoring is solved.

The invention relates to the technical field of engineering logging, and discloses a low-power-consumption radio frequency ion source logging neutron tube and a working method, deuterium gas is ionized into deuterium ions through an ion source, the deuterium ions are accelerated under the action of a strong electric field to obtain energy, and the high-energy deuterium ions bombard a deuterium / tritium target to generate nuclear reaction to generate neutrons. The power requirement of the radio frequency source can be greatly reduced. Compared with an inductive coupling type radio frequency ion source neutron tube, the capacitive coupling type neutron tube has the advantages that D1 + 1 in plasma is increased to 50%, the required power is 25%-30% of that of the inductive coupling type neutron tube, the load of a neutron generator is greatly reduced, the D-D deuterium neutron tube is further applied to engineering practice, and powerful technical support is provided for green and environment-friendly well logging.

The invention relates to the technical field of nuclear, in particular to a device for detecting selenium content in fruits, which comprises a D-D neutron generator and a measuring chamber, the D-D neutron generator generates neutrons, the neutrons in the measuring chamber enter a sample to generate nuclear reaction with atomic nucleuses in the sample in the measuring chamber, and the neutrons in the measuring chamber are generated; after the atomic nucleus of the measuring chamber is activated, instant gamma rays and delayed gamma rays are released; the high-purity germanium detector in the measuring chamber receives delayed gamma rays of all elements in the sample in the measuring chamber and converts each gamma photon into an electric pulse signal; the multichannel analyzer is used for converting the electric pulse signals of the measuring chamber into digital signals, dividing channel addresses according to the size of the digital signals, counting the pulse number and forming a gamma ray energy spectrum; and the computer in the measuring chamber calculates the selenium content in the sample in the measuring chamber through the gamma ray energy spectrum in the measuring chamber. The method has the advantages of low detection limit, small error and high measurement result precision, and can quickly realize the detection of the selenium content in the fruits.

The application provides a pulse neutron element scanning and analyzing system for extraterrestrial exploration, which comprises a shell, a support, a neutron generator, a shielding body and a gamma spectrometer, the support is installed in the shell, the neutron generator, the shielding body and the gamma spectrometer are all installed on the support, and the shielding body is located between the neutron generator and the gamma spectrometer. The neutron generator, the shielding body and the gamma spectrometer are integrally installed on the support, the controllable neutron source is combined with the gamma spectrometer, the stratum is activated by the controllable pulse neutron generator, the element components are detected by gamma analysis, or the gamma generated by the natural radioactive nuclides and the cosmic background radiation is directly detected, element component analysis is carried out, the element measurement precision is improved, the detection time is shortened, more kinds of elements can be measured, and the application provides strong support for the measurement of more kinds of elements, and is suitable for lunar geology and resource exploration.

Methods and systems described herein may comprise a neutron generator tube; a gas replenisher; and a heat blanket applied to the neutron generator tube configured to insulate the gas replenisher. In addition, the heat blanket comprises an acrylic polymer-based elastomer. Further, the acrylic polymer-based elastomer is cross-linked with mineral fillers to form a composite material.

The application discloses a kind of based on pulse neutron technology's borehole in-situ lithium ore content measurement method and device, device includes pulse neutron generator, neutron detector, gamma detector and electronic processing equipment, measurement method includes: obtaining the time spectrum information of borehole in-situ place detection neutron, according to time spectrum information, neutron lifetime is calculated;According to the formation of different lithium ore grade under the macroscopic cross section of neutron lifetime calculation;According to the relationship equation of formation macroscopic cross section and lithium content, based on the calculation of formation macroscopic cross section, obtains scale lithium content;The calibration curve of lithium content is scaled based on the distribution of formation macroscopic cross section and scaled calculation, and the actual lithium ore grade distribution of formation is obtained.According to the change of time spectrum attenuation under different borehole size, wellbore correction equation is established, and the influence of wellbore is corrected.According to gamma energy spectrum, the content of hydrogen in water-containing wellbore is monitored, and the influence of water-containing wellbore is corrected according to hydrogen characteristic peak count.

The invention discloses a method for realizing an ultra-compact self-moderation neutron generator. The ultra-compact self-moderation neutron generator comprises an ion source system, a vacuum system and a target system, according to the method, a high-voltage base is introduced into the ultra-compact self-moderation neutron generator, and the high-voltage base is fixedly connected with a target base of the target system. According to the ultra-compact self-moderation neutron generator, by introducing the high-pressure base made of the polyethylene material, on one hand, the device has the neutron moderation capacity, and the requirement of the outside for neutron moderation is lowered; on the other hand, the high-pressure base directly participates in vacuum sealing, so that the device is more compact The shielding layer structure plays a role in preventing neutrons from diffusing all around. The device has the advantages of small overall size, high integration level, high moderation efficiency, high neutron utilization rate and the like.

Systems and techniques are provided for optimizing the performance of a target for a downhole neutron generator. An example method can include disposing a first source material and a first substrate in a vacuum chamber at an initial temperature, evaporating the first source material to be deposited onto a surface of the first substrate, monitoring a temperature of the first substrate during the evaporation of the first source material, and determining a thermal equilibrium process temperature at which the temperature of the first substrate is stabilized. The example method can further include disposing a second source material and a second substrate in the vacuum chamber at the thermal equilibrium process temperature, evaporating the second source material to be deposited onto a surface of the second substrate, and obtaining the second substrate deposited with the second source material for a target of a downhole neutron generator.

This application discloses a control method, device, and storage medium for an online material moisture monitoring system, relating to the field of material moisture monitoring technology. The method includes: starting a neutron generator assembly; when the start-up time of the neutron generator assembly is greater than or equal to a preset preheating time, activating a neutron detector assembly and a gamma detector; determining the cumulative scattered neutron share of the measured material based on the detection results of the neutron detector assembly, and obtaining the cumulative scattered neutron share to match the corresponding target hydrogen density from a preset correlation library; generating a gamma spectrum based on the gamma rays monitored by the gamma detector according to pulse amplitude classification and counting, and extracting the water hydrogen characteristic peak area from the gamma spectrum; determining the solidified hydrogen ratio based on the target hydrogen density, the water hydrogen characteristic peak area, and the energy spectrum calibration coefficient of the gamma spectrum; and determining the free water content of the measured material based on the solidified hydrogen ratio. This application solves the problem of low accuracy in moisture monitoring through dual-modal collaborative detection.

The invention discloses a boron neutron capture therapy device based on a compact deuterium-deuterium neutron generator. The device comprises a shielding shell, a neutron source part and a support frame part, the support frame part comprises a support base and a support frame, and the end part of the support frame is fixed on the support base; the supporting base and the supporting frame form an accommodating space; the neutron source part is used for emitting neutrons, and the shielding shell is used for shielding all neutrons in a non-0-degree direction; when the boron neutron capture therapy device is started, the accommodating space forms a neutron field only retaining the 0-degree direction. The device is formed by closely splicing a plurality of compact deuterium-deuterium neutron generators, a traditional nuclear reactor or a large accelerator is replaced, miniaturization of the BNCT technology is successfully achieved, the construction and use cost is remarkably reduced, and the clinical accessibility and practicability of the technology are improved.

This invention discloses a neutron analysis physics testing system and method, belonging to the field of nuclear physics testing technology. The system includes: a high-speed synchronous pulse generator for generating pulse signals with multiple modulation sequences; an ultrashort pulse neutron generator for emitting short pulse neutron rays with specified parameters onto a sample; a neutron detector for acquiring secondary neutron signals; a gamma detector for acquiring characteristic gamma signals generated by neutron-excited probes of the sample; a safety control module for controlling the operating state of the ultrashort pulse neutron generator; and a data processing device for real-time collection and summarization of neutron signals and characteristic gamma signals based on the timing of the pulse signals with multiple modulation sequences. This system reduces time window drift and measurement errors, and activates the ultrashort pulse neutron generator only when a gate signal allows, improving the accuracy, safety, and stability of geological physics parameter measurements.

A controllable source neutron generator mechanical structure disclosed by the present invention comprises a high-voltage transmission line, a high-voltage screw plug, a multiplying short section, an insulating shell and a transformer seat, the high-voltage transmission line is connected with a voltage multiplying short section through the high-voltage screw plug, the insulating shell is sleeved outside the high-voltage transmission line, and the insulating shell is connected with the transformer seat through a screw. The high-voltage transmission line is connected with the high-voltage screw plug connecting hole in a matched mode and is compressed through threads in the radial direction to form a small assembly. The high-pressure plug screw and the upper end of the multiplying nipple are positioned through a special-shaped shaft shoulder, the end faces are aligned, a radial screw is fixed to form a high-pressure transmission line, and the high-pressure plug screw and the multiplying nipple are consistent in axial direction. Then, a large assembly composed of the high-voltage transmission line, the high-voltage plug screw and the multiplication short section is positioned and connected with a center special-shaped hole of the transformer in a matched mode through a special-shaped shaft shoulder at the lower end of the multiplication short section, end faces are aligned, and the neutron generator core shaft core is formed through radial fixing by screws. In the whole assembling process, all components only move in the axial direction in one direction, rotation and reciprocating are avoided, and the assembling process is simplified.

A logging tool is used to measure formation porosity. The tool has a pulsed neutron generator and multiple dual-function detectors that can detect neutrons and gamma rays. The ratios of thermal neutrons, epithermal neutrons, and captured gamma rays from multiple detectors are used to obtain multiple neutron porosities and multiple gamma-ray porosities at different exploration depths. The neutron porosity and gamma-ray porosity can be further corrected by excluding peak regions attributed to hydrogen and / or chlorine to reduce shale effects and / or chlorine effects. The neutron porosity and gamma-ray porosity can be combined to provide a better porosity assessment at different exploration depths in the formation over the entire porosity measurement range (0-100 p.u.).

The invention discloses a uranium mine logging instrument based on ultrashort pulse neutrons and a working method thereof, and relates to the field of uranium mine exploration logging. The logging instrument comprises a control communication short section, an ultrashort pulse neutron generator used for emitting fast neutron pulses with the pulse width smaller than 1 microsecond to a stratum, a shielding body and a double-thermal-neutron detection assembly used for detecting thermal neutrons and epithermal neutrons on measuring points consistent in space, all of which are sequentially arranged in the axial direction of the logging instrument. The gamma detector is used for detecting inelastic scattering gamma rays emitted by stratum elements and capturing gamma rays, and the fast neutron detector is used for detecting and outputting source intensity monitoring signals of fast neutron pulses in real time. According to the logging instrument, the ultra-short fast neutron pulse is emitted, the neutron yield is detected in real time, the neutron time spectrum and gamma-ray energy spectrum multi-dimensional information with an accurate timestamp are obtained in a combined mode, high-precision and anti-interference inversion is conducted on the stratum uranium content, and stratum information is obtained efficiently and accurately.

A variety of methods and apparatus are disclosed, including, in one embodiment, a pulsed neutron logging tool for a borehole in a subterranean formation, including: a pulsed neutron generator to broadcast neutrons into the subterranean formation; and a gamma ray scintillator detector comprising cerium bromide (CeBr3), wherein the pulsed neutron logging tool (e.g., as lowered into the borehole) is configured to detect neutron-induced gamma rays from the subterranean formation and natural gamma rays from the subterranean formation.

The invention discloses a trigger pulse circuit and system, and relates to the field of measurement, and a time-delay controllable trigger circuit arranged in the trigger pulse circuit can convert a received CMOS level trigger signal into a CMOS level trigger pulse signal which can be recognized by a neutron generator high-voltage circuit when a first preset time after power-on is reached. And the neutron generator high-voltage circuit generates a neutron targeting pulse signal after receiving the CMOS level trigger pulse signal and transmits the neutron targeting pulse signal to the neutron tube, so that the neutron targeting operation can be carried out only when the storage type logging instrument is electrified for a first preset time. Neutron targeting caused by abnormal work of the storage type PNN logging instrument on the ground can be prevented, personal injury is completely eradicated, and the safety of the scheme is improved.

The application provides a direct-current high-voltage pulse strong-current pulse neutron generator, and relates to the technical field of neutron generators, comprising a main arc power module (3), a high-voltage accelerating power module (9) and a neutron tube (12). The neutron generator of the application is a strong-current pulse neutron generator working and driven in a direct-current high-voltage accelerating and pulse mode, can realize adjustable pulse parameters, is simpler to realize, widens the neutron pulse width from sub-microsecond to several milliseconds, and is helpful to widen the application field of the strong-current pulse neutron generator. For example, the ms-level strong-current pulse neutron source can be applied to the mass flow rate and component measurement based on neutron activation.

The invention discloses a neutron analysis physical testing system and method, and belongs to the technical field of nuclear physical testing. The system comprises a high-speed synchronous pulse generator used for generating pulse signals of various modulation sequences; the ultrashort pulse neutron generator is used for emitting short pulse neutron rays with specified parameters to the sample; the neutron detector is used for acquiring a secondary neutron signal; the gamma detector is used for acquiring a characteristic gamma signal generated by the neutron excitation detection sample; the safety control module is used for controlling the working state of the ultrashort pulse neutron generator; and the data processing device is used for collecting and gathering neutron signals and characteristic gamma signals in real time according to the time sequence of the pulse signals of the multiple modulation sequences. According to the system, time window drift and measurement errors are reduced, the ultra-short pulse neutron generator is started only under the condition that access control signals allow, and the accuracy, safety and stability of stratum physical parameter measurement are improved.

A neutron porosity tool having an electronic neutron generator arrangement and a control mechanism used to provide voltage and pulses to an electronic neutron tube is provided, the neutron generator arrangement including: at least one vacuum tube; at least one ion target; at least one radio-frequency cavity; at least one high-voltage generator; at least two neutron detectors; at least one pulser circuit; and at least one control circuit. A method of controlling a neutron porosity tool having an electronic neutron generator arrangement and a control mechanism that provides voltage, and pulses to an electronic neutron tube, the method including at least: controlling a bipolar neutron tube to produce two distinct neutron reactions; using a control circuit to modify the output of a pulser circuit; and using a plurality of neutron detectors to determine formation response offsets.