89results about "Material analysis using neutrons" patented technology

Provided is an inspection robot that is self-propelled on piping, measures moisture contained in a lagging material using a mounted inspection device, for example, a neutron moisture meter, and detects risk of corrosion. The inspection robot includes a main frame 1 including a recessed part 17 fit onto an outer circumferential surface of piping P, a main frame drive mechanism (first drive mechanism) D1 that causes the main frame to advance / retract in an axis direction of the piping, a revolving member 32 supported in an advanceable / retractable manner along an arc-shaped locus in the recessed part of the main frame, a revolving member drive mechanism (second drive mechanism) D2 that moves the revolving member, and an inspection device mounted on the revolving member.

In one example, a radiation source comprises a housing and an acceleration chamber within the housing, with a peak acceleration energy greater than the lowest neutron production threshold of tantalum. A source of charged particles is supported by the housing to emit charged particles into the acceleration chamber. A target is supported by the housing downstream of the acceleration chamber. The target consists essentially of at least one isotope having a neutron production threshold greater than the peak acceleration energy. No neutrons are therefore generated. The source may also comprise a collimator, target shielding, and / or housing shielding comprising at least one isotope having a neutron production threshold greater than the peak acceleration energy, reducing or eliminating neutron generation as compared to the prior art, as well. Systems comprising the source, methods of operation of the source, and methods of manufacture of the source are also disclosed.

Provided is an inspection robot that is self-propelled on piping, measures moisture contained in a lagging material using a mounted inspection device, for example, a neutron moisture meter, and detects risk of corrosion. The inspection robot includes a main frame 1 including a recessed part 17 fit onto an outer circumferential surface of piping P, a main frame drive mechanism (first drive mechanism) D1 that causes the main frame to advance / retract in an axis direction of the piping, a revolving member 32 supported in an advanceable / retractable manner along an arc-shaped locus in the recessed part of the main frame, a revolving member drive mechanism (second drive mechanism) D2 that moves the revolving member, and an inspection device mounted on the revolving member.

A neutron imaging system detects both the phase shift and absorption of neutrons passing through an object. The neutron imaging system is based on either of two different neutron wavefront sensor techniques: 2-D shearing interferometry and Hartmann wavefront sensing. Both approaches measure an entire two-dimensional neutron complex field, including its amplitude and phase. Each measures the full-field, two-dimensional phase gradients and, concomitantly, the two-dimensional amplitude mapping, requiring only a single measurement.

The invention relates to a quantitative analysis method for the mixing uniformity of raw materials of a supercapacitor electrode. The method is characterized by comprising the following steps: marking the raw materials of a supercapacitor electrode by a tracer agent, mixing the raw materials into a slurry or dry mixture, quantitatively detecting the content of tracer agent in the mixed slurry or dry mixture, calculating the relative standard deviation (RSD) of the tracer agent content detected at different positions of mixing equipment after the mixing of electrode raw materials, and analyzing the mixing uniformity of the electrode raw materials. The technical scheme provided by the invention can fill in the blank of reasonable mixing uniformity detection means in a mixing stage of an electrode preparation process of existing supercapacitor, and effectively solves the problems of insufficient dispersing uniformity of slurry or low slurrying efficiency and low mixing uniformity or low mixing efficiency of dry carbon particles and dry binder.

A method for correcting data collected with a neutron emitting instrument, includes: obtaining characterization data for the instrument, the characterization data including inelastic background data of the instrument; and correcting the collected data according to the characterization data. A computer program product and an instrument are provided.

A detector signal processing circuit is composed of a current / voltage converting unit which converts the current value, which is converted by a neutron detector, to a voltage value which corresponds to the current value; a variable gain amplifying unit which includes an operating amplifier, in which a D / A converter is added, and amplifies the voltage value which is converted by the current / voltage converting unit; a regulation control means which regulates a gain of the D / A converter; and a comparator which automatically compares an output voltage, which is amplified by the variable gain amplifying unit, in accordance with a reference value which is previously set, so as to output the output voltage to the regulation control means.

A method and apparatus for inspecting an object is present. Radiation is emitted from a radiation source. A beam is formed from a portion of the radiation emitted by the radiation source using a collimator. The collimator is connected to the radiation source by a bearing system comprising a first structure associated with the radiation source and a second structure connected to the first structure. The second structure is configured to hold the collimator. The second structure of the bearing system is moved using a movement system such that the second structure rotates in one of a plurality of directions substantially about a center point in the radiation source while the radiation source remains stationary relative to the second structure. Rotation of the second structure substantially about the center point in the radiation source changes a direction in which the beam is directed.

A downhole tool and method for performing a base log sigma measurement of a formation. The tool comprising a nuclear source for irradiating the formation and a detector for obtaining a sigma measurement of the irradiated formation. The tool is mounted close to a drill bit arranged to drill a borehole into the formation and is capable of determining a base log sigma measurement of the formation while drilling into the formation.

The present invention relates to the technical field of neutron reflection, particularly to a neutron reflection spectrometer optical path structure capable of performing rapid switching between a polarization mode and a non-polarization mode. The optical path structure mainly comprises an incident arm, a sample table and a reflection arm, wherein the incident arm comprises a first slit, a second slit, a third slit, a focusing conduction pipe, a polarizer, a first translation table, a second translation table, a first platform, a second platform and an incident arm base, the sample table comprises a vertical electromagnet, a sample, a cryostat, a third platform, a sample attitude adjustment mechanism and a sample table base, and the reflection arm comprises a fourth slit, a lifting table, a polarization analyzer, a detector, a third translation table, a reflection arm base, a fourth platform and a reflection arm rotation drive mechanism. According to the present invention, the rapid switching between the polarization mode and the non-polarization mode can be achieved by simply controlling and adjusting the movements of the three translation tables and the lifting table, such that the structure is easily achieved, and the precision of the experiment is high.

A neutron generator includes a fuel source configured to provide a neutron-producing fuel. The neutron generator includes a plasma confinement device coupled to the fuel source and configured to generate a z-pinch of the neutron-producing fuel.

A method and apparatus for inspecting an object is present. Radiation is emitted from a radiation source. A beam is formed from a portion of the radiation emitted by the radiation source using a collimator. The collimator is connected to the radiation source by a bearing system comprising a first structure associated with the radiation source and a second structure connected to the first structure. The second structure is configured to hold the collimator. The second structure of the bearing system is moved using a movement system such that the second structure rotates in one of a plurality of directions substantially about a center point in the radiation source while the radiation source remains stationary relative to the second structure. Rotation of the second structure substantially about the center point in the radiation source changes a direction in which the beam is directed.

A cosmogenic neutron sensor includes a hydrogen-sensitive neutron detector orientable above a measurement surface. A neutron shield is positionable on the hydrogen-sensitive neutron detector. The neutron shield is positioned to interact with at least a portion of cosmogenic neutrons propagating in a direction of the hydrogen-sensitive neutron detector.

The invention discloses a tight sandstone anhydrous gas reservoir gas-bearing capacity evaluation method, and solves the technical problem of low tight sandstone anhydrous gas reservoir gas-bearing capacity evaluation precision in the prior art. The method mainly comprises the following steps: sequentially calculating a shale content curve Vsh, an effective porosity curve phi e, a pure rock neutron curve CNL1, an apparent sandstone skeleton hydrogen content index curve CNL2 and a gas content evaluation index parameter GASFG curve, and finally carrying out gas content evaluation according to the gas content evaluation index parameter GASFG curve. According to the method, the excavation effect of the natural gas on the neutron logging curve is fully utilized to quantitatively characterize the gas-bearing index parameters, and the technical problem in the prior art that the tight sandstone anhydrous gas reservoir is difficult to accurately evaluate the gas-bearing property of the reservoir under the condition that stratum water and other data are lacked is effectively solved through classification evaluation. Practice proves that the technology not only can accurately evaluate the gasbearing capacity of the tight sandstone anhydrous gas reservoir, but also can effectively identify the high gamma reservoir, so that an accurate exploration method is provided for oil and gas exploration.

The invention discloses a method for detecting the hollow depth of concrete under a steel shell. The method comprises the steps as follows: step 1, establishing a hollow depth calibration curve library: by changing hollow depth 1 between a steel plate and a concrete simulation standard block, thickness h of the steel plate and water content omega of the concrete simulation standard block, calibrating the hollow depth 1 by a thermal neutron detector to obtain the hollow depth calibration curve library, wherein the hollow depth calibration curve library comprises multiple hollow depth calibration curve units with different water contents, and each hollow depth calibration curve unit comprises three hollow calibration curves with different steel plate thicknesses; step 2, arranging detectionpoints; step 3, selecting and determining hollow depth calibration curves; step 4, measuring and determining the hollow depth. The hollow depth calibration curves are established, effects of water content of concrete on the hollow depth are fully considered, and different calibration curves are adopted for different steel plate thicknesses and water content of concrete, so that the detection of the hollow depth is more accurate and rapid.

The invention discloses a steel shell-concrete stripping detection device which comprises a thermal neutron detector, a steel plate and a concrete simulation marking block, wherein the steel plate isarranged above the concrete simulation marking block; a gap of which the size can be adjusted is formed between the steel plate and the concrete simulation marking block; the concrete simulation marking block comprises clamping plates, metal standard plates and organic material standard plates; the metal standard plates and the organic material standard plates are in identical lengths and widths;the metal standard plates and the organic material standard plates are vertically or transversely clamped and overlapped between the clamping plates in an alternative manner; the ratio of the metal standard plates to the organic material standard plates is adjusted according to expected concrete water contents and densities. The principle that the retarding and speed reduction action of fast neutrons is determined by the content of hydrogen atoms in concrete is smartly utilized, the detachable concrete simulation marking block is creatively manufactured, concrete of different water contents israpidly simulated, the manufacturing cycle is short, furthermore the indoor calibration cycle is short, and stripping depths of concrete of different water contents under steel shells can be calibrated.

The invention discloses a method for quickly identifying the mineral volume content of a shale formation, which comprises the following steps: 1. Obtaining the mineral content of the target shale formation; 2. Establishing a volume model of the target shale formation and constructing the described The logging response equation of the objective shale formation under different volume content parameters, and determine the error and measurement error of the logging response equation; 3. Based on the actual logging curve, logging response equation, error and measurement error of the response equation, establish a log The objective function of well interpretation; 4. Obtain the optimal volume content parameter corresponding to the minimum value, and draw the logging response forward modeling result curve and the confidence interval of the forward modeling curve corresponding to the optimal volume content parameter; 5. Check the measured Whether the well response forward modeling result curve matches the actual logging curve, the mineral volume content in the volume content parameter corresponding to the matching forward modeling result curve is taken as the determination result.

Embodiments of the present invention disclose a nuclide identification method, a nuclide identification system, and a photoneutron emitter. The photoneutron emitter comprises: a pulsed electron accelerator configured for emitting electrons; and a photoneutron converting target configured to receive the electrons emitted by the pulsed electron accelerator and convert the electrons into photoneutrons. The photoneutron converting target has a volume of about 100 to about 8000 cm3, of about 100 to about 2500 cm3, or of about 785 cm3. These embodiments of the present invention can improve an accuracy of identification of a nuclide, and provide a practical photoneutron emitter, method and system for identifying a nuclide. Especially, these embodiments of the present invention can improve an accuracy of identification of a fissile nuclide such as 233U, 235U, and 239Pu, and provide a practical photoneutron emitter, method and system for identifying a fissile nuclide such as 233U, 235U, and 239Pu.

A cosmogenic neutron sensor includes a hydrogen-sensitive neutron detector orientable above a measurement surface. A neutron shield is positionable on the hydrogen-sensitive neutron detector. The neutron shield is positioned to interact with at least a portion of cosmogenic neutrons propagating in a direction of the hydrogen-sensitive neutron detector.

The invention provides an irradiation sample automatic adjusting and detecting device. A worktable of the device is provided with a sample table adjusting rack used for adjusting positions of samples and a detector adjusting rack used for monitoring radiation conditions of the samples. By means of the adjusting and detecting device, the positions of the samples in the radiation environment can be automatically adjusted, the radiation conditions of the samples can be detected, and the adjusting and detecting process is completely automatic. The device has the function of controlling the sizes and the positions of the samples and the detection angle and a path of a detector, the samples can be irradiated and detected at a time, and multi-angle multi-position irradiation and detection of the same sample can be completed for many times.

The invention provides an automatic time calibration method along with particle neutron detection. The time calibration method comprises the following steps: placing a graphite block at a certain distance in front of a neutron generator; controlling the neutron generator to emit neutron beams to the graphite block; measuring an alpha-gamma conformance flight time spectrum based on an associated particle detection technology; determining a spectrum peak formed by directly acting neutrons on the graphite block according to the measured alpha-gamma conformance flight time spectrum, and taking theconformance time corresponding to the spectrum peak as measurement reference time; and carrying out neutron detection on a detection object to determine content characteristics of related elements inthe detection object. According to the method, the problem that the calibration time of a Si semiconductor detector used for measuring the accompanying particles along with temperature and time changes is unstable is solved, the detection positioning precision of the to-be-detected object is ensured, and accurate analysis of element characteristics in a detection area is realized.

The invention provides a natural gas hydrate reservoir true triaxial hydraulic fracturing simulation test device and method, belongs to the technical field of geotechnical engineering and testing, and aims to realize monitoring of a hydrate-containing sediment fracture process and a fracturing fluid flowing process. According to the device, a true triaxial hydraulic fracturing system provides a high sealing condition for a test piece, applies principal stress in three directions, and can also inject fracturing fluid to simulate a hydraulic fracturing process; a temperature control system controls test temperature and maintains the state of a hydrate during the fracturing test; a gas-liquid collecting system is used for collecting and measuring gas and water produced in the test; a neutron image pickup monitoring system monitors the contents of carbon, hydrogen and oxygen elements in the hydrate, analyzes the disordered distribution of guest molecules in a water cage, and monitors the evolution condition of the water content in the test piece during true triaxial hydraulic fracturing and the thermodynamic and dynamic processes of the phase change process of the hydrate in a pore medium; and a fracturing control and data acquisition system is used for adjusting three-way pressure and acquiring data. Test operation is simple and convenient.

A gamma ray scintillation spectrometer is disclosed in which an inorganic scintillation crystal has a channel extending therethrough for receiving a sample into, and disposing a sample out of, the scintillation crystal. The spectrometer further includes a photomultiplier tube optically coupled to the scintillation crystal to detect photons generated by the scintillation crystal. A system and a method for using the gamma ray scintillation spectrometer are also provided.

The systems for determining and imaging wax deposition and simultaneous corrosion and wax deposit determination in pipelines relate to systems for determining wax deposition and corrosion by one or both of two techniques. In both techniques, a source of neutron radiation is directed at the pipeline. In one technique, a neutron detector surrounded by an absorption shield defining a collimation window counts neutrons reflected back to the detector by back diffusion or backscatter radiation. In the other technique, a gamma ray detector measures gamma rays emitted when the emitted neutrons are absorbed in the pipeline. A neutron moderator-reflector is placed around three sides of the pipeline to increase the likelihood of neutron capture.

A neutron generator includes a fuel source configured to provide a neutron-producing fuel. The neutron generator includes a plasma confinement device coupled to the fuel source and configured to generate a z-pinch of the neutron-producing fuel.

The invention is suitable for the technical field of neutron detection, and provides a concrete disengaging detection system. The system includes a measuring instrument and a host, the measuring instrument comprises a neutron source; the neutron source is placed on a steel plate covering the surface of the concrete and is used for emitting fast neutron to the concrete; the measuring instrument isused for measuring the thermal neutron counting rate at two different positions far from the neutron source on the steel plate, and sending the counting rate ratios of the thermal neutron counting rates at the two positions obtained by calculation to the host; the host is used for acquiring the thickness of the steel plate, and finding the corresponding relation between the received counting rateratio and the concrete disengaging depth according to the thickness; and determining the concrete disengaging depth corresponding to the counting rate ratio according to the corresponding relation. According to the embodiment of the invention, a lot of tedious operations are saved, and the actual efficiency of the concrete disengaging depth measurement is greatly improved.

The invention discloses a medium-and-small-scale soil water monitoring system based on a cosmic ray neutron method and UAV (unmanned aerial vehicle) remote sensing. The system comprises a cosmic ray fast neutron monitoring system consisting of a CRNP, a solar power supply system and a support; an automatic meteorological station, which is arranged at the periphery of the CRNP and is used for measuring related meteorological data such as air pressure and atmospheric relative humidity; a UAV remote sensing system, which is an unmanned aerial vehicle which carries visible light, near infrared, thermal infrared imaging and / or laser ranging radar (LiDAR) devices and has an aerial photography function; a remote data transmission system; and a data processing center. The invention further provides a corresponding medium-and-small-scale soil water monitoring method. The invention fuses the advantages of accurate macroscopic soil water quantity monitoring of the cosmic ray neutron method and high spatial resolution of UAV (unmanned aerial vehicle) remote sensing and establishes a new medium-small-scale soil water monitoring method and device, and fills the technical blank between point-scale and remote sensing large-scale soil water monitoring.

A method for correcting data collected with a neutron emitting instrument, includes: obtaining characterization data for the instrument, the characterization data including inelastic background data of the instrument; and correcting the collected data according to the characterization data. A computer program product and an instrument are provided.

The invention discloses a photoneutron source and a neutron inspection system. The photoneutron source comprises an electron accelerating tube, an X-ray converting target, a photoneutron target and aneutron modulating housing, wherein the electron accelerating tube is used for accelerating an electron beam current; the electron beam current accelerated by the electron accelerating tube impacts the X-ray converting target to generate X rays; the X rays enter the photoneutron target and generate photoneutrons; the neutron modulating housing houses the outside of the photoneutron target, and comprises a neutron collimating opening for outputting the photoneutrons. According to the photoneutron source and the neutron inspection system, a required electron beam current can be directly output from the neutron collimating opening of the photoneutron source.