60 results about "Magnetic testing" patented technology

The invention relates to a multi-pole magnetic field magnetizing test method and a spiral winding group thereof, and relates to the field of automatic magnetizing technology, and the method comprises the steps: constructing a test model, importing design parameters of a magnet to be tested, determining a multi-pole magnetic field distribution theoretical model, and defining a magnetic pole region and a key feature contour line; acquiring magnetic field data, scanning the surface of the magnetized magnet by using an array probe, and acquiring magnetic field intensity actual measurement data of a multi-dimensional coordinate; matching a magnetic pole contour, comparing an actually measured contour line with a theoretical contour line, and establishing sampling point mapping; correcting the deviation data, screening the deviation sampling points exceeding the threshold value, and determining magnetizing process adjustment parameters; and evaluating the magnetizing efficiency, carrying out iterative magnetizing based on the correction parameters, and generating an evaluation report containing indexes such as magnetic field uniformity and the like. The method has the effect of improving the magnetic field intensity and stability of the magnet during orientation magnetization.

The present invention relates to the field of magnetic detection technology, and discloses a nanocrystalline strip magnetic testing device, including a nanocrystalline strip detection box, wherein both sides of the inner wall of the nanocrystalline strip detection box are fixedly connected with brackets, the outer walls of the two brackets are rotatably connected with rotating bodies through a second rotating shaft, and the outer walls of the two rotating bodies are rotatably installed with limit members, wherein the limit members are composed of two clamping rollers that can be adjusted to be close or far away, and further include a bending assembly, wherein the bending assembly can bend the nanocrystalline strip located between the two groups of rotating bodies, and the bending has two states, one of which is static bending and the other is dynamic bending. The present invention cooperates with the friction wheel, the friction plate and the clamping roller, so that the clamping roller actively rotates to send the nanocrystalline strip to the middle, thereby reducing the pulling force on the nanocrystalline strip as much as possible, thereby reducing the influence of the pulling force on the magnetic performance result, and making the final test result more accurate.

The invention relates to the technical field of water flooding gas reservoirs, in particular to a rock core displacement fluid saturation testing method and a testing device thereof.The method comprises the steps that S1, the original formation pressure and temperature of a gas reservoir are obtained; s2, obtaining a rock core, and testing physical property data of the rock core; then carrying out nuclear magnetic testing on the rock core; s3, saturating the rock core with formation water, and then carrying out nuclear magnetic testing; s4, carrying out gas drive water seepage test on the rock core according to the data in the S1, and obtaining the drive water quantity; s5, performing nuclear magnetic test on the depleted rock core; s6, obtaining the irreducible water saturation of the depleted rock core according to the nuclear magnetic test results of the steps S2, S3 and S5; s7, the total irreducible water saturation of the rock core is obtained according to the rock core physical property data, the displacement water amount and the irreducible water saturation of the rock core after exhaustion; the device comprises a drying oven, a first container, a second container, a core holder, a confining pressure pump, a displacement pump, a back pressure assembly, a receiving container and an electronic balance. The accuracy of fluid saturation determination can be improved.

The invention discloses a high-performance layered nitride thermoelectric material screening method and system. The method comprises the following steps: acquiring a series of crystal structures of initial layered nitride; carrying out magnetic test on the material by utilizing first principle calculation, and selecting a non-magnetic material; carrying out structure optimization on the non-magnetic material, carrying out static calculation and electron energy band structure calculation after calculation convergence, and selecting a material with a band gap range of 0.1-3 eV and high energy band structure degeneracy; calculating partial charge density of the material, and judging whether two-dimensional electron gas exists or not, namely, alternate occurrence of a conductive layer and an insulating layer; stability judgment: carrying out phonon spectrum and molecular dynamics simulation calculation on the material, and selecting the material with phonon spectrum without imaginary frequency and stable dynamics; the heat transport performance of the material is calculated, the lattice heat conductivity and Green Ehson parameters are obtained, and the material with high non-harmony is found; and finally, carrying out electric transport calculation to obtain the ZT value of the material.

A high and low temperature test device used in a non-magnetic environment comprises an intelligent temperature controller and is characterized in that the intelligent temperature controller is connected with a liquid inlet and a liquid outlet of a non-magnetic test box through non-magnetic rubber pipes; a temperature sensor is arranged in the non-magnetic test box; the temperature sensor is in signal connection with the intelligent temperature controller; a heat-conducting medium circulates in a closed circulating system, and heating / cooling is performed in a heat conduction manner, so that accurate temperature control on a tested product in a non-magnetic environment is realized, a temperature change rule in an atmospheric environment or other specific scenes is accurately simulated, and uniformity, stability and quick response of temperature control are ensured; and the high and low temperature test device has the advantages of fast temperature change response speed and high temperature zone uniformity, does not generate an interference magnetic field in a working area in the working process, and ensures the normal work of a magnetic test instrument.

The invention relates to a radial shimming coil of a hollow cylindrical working area, which is characterized in that decoupling is carried out through a coupling effect of a magnetic shielding barrel and a coil magnetic field, a radial magnetic field component analytic function of the coil at any point in space is obtained through derivation based on a magnetic field superposition principle, and iterative solution is carried out by adopting a particle swarm optimization algorithm; the optimal coil design parameters meeting the target magnetic field distribution are obtained; a magnetic field with magnetic lines in a radial diverging shape and uniform size is formed in a hollow cylindrical working area and is used for magnetic compensation and probe calibration of magnetometers distributed in an annular array in the muscle magnetism and leg magnetism testing process, and the matching degree of the shimming effect and the sensitive direction of a sensor is improved.

The invention discloses a magnetic field sensor chip, and relates to the field of magnetic field sensors, and the magnetic field sensor chip comprises a plastic package floor layer. The magnetic conductive structure layer is arranged on the upper side of the plastic package floor layer; the magnetic sensitive thin film device is arranged on the upper side of the magnetic conductive structure layer, and the magnetic sensitive thin film device comprises a substrate, a bottom electrode layer, a TMR functional layer, a top electrode layer, a passivation layer, a seed layer and a sputtering magnetic conductive layer from bottom to top; and the packaging shell layer is arranged on the upper side of the magnetic conductive structure layer, and a protection object is filled between the packaging shell layer and the magnetic conductive structure layer. The wide-range magnetic sensitive film structure is adopted, the linear interval of the device is further widened under the action of the double magnetic conductive layers, the magnetic linear measurement interval superior to 0.5% within the linearity degree of 2000 Gs and the magnetic test precision superior to 0.1 Gs are achieved, the measurement range of the tunneling magnetoresistance TMR magnetic sensitive device is greatly widened, and the measurement precision of the device is improved. And the magnetic field measurement precision of similar products in the same interval is improved by utilizing the characteristic of high precision.

The application discloses a kind of based on bevel gear's non-magnetic testing device and testing method, including driving mechanism, first rotating shaft, first bevel gear, second bevel gear, second rotating shaft, first bevel gear is fixedly connected with first rotating shaft, driving mechanism drives first rotating shaft to drive first bevel gear rotation, first bevel gear is rotated to second bevel gear, so that second bevel gear rotates around second rotating shaft;Second bevel gear is used as object platform, for carrying measured object, by setting the tooth engagement angle of first bevel gear, second bevel gear, in the case where first rotating shaft is fixed, so that measured object carried on second rotating shaft obtains the measurement angle of space arbitrary direction.The application uses a bevel gear to carry measured object, so that the rotating shaft of rotary table and the rotating shaft of driving mechanism are at any angle, and the structure is compact, improves use flexibility, and is suitable for only a small amount of opening exists closed magnetic shielding space use.

The invention discloses a ferromagnetic metal material average grain size characterization method based on magnetic domain motion characteristics, which comprises the following steps: firstly, preparing a sample for EBSD method material characterization and multi-magnetic detection equipment detection; secondly, carrying out quantitative characterization on the average grain size of the sample based on EBSD method material characterization; then, performing electromagnetic nondestructive testing on the ferromagnetic metal material based on a multi-magnetic testing device to obtain electromagnetic signals representing reversible and irreversible motion of a magnetic domain, and defining and extracting corresponding electromagnetic characteristic parameters of the ferromagnetic metal material at the same time; and finally, by analyzing the relationship between the electromagnetic characteristic parameters and the characteristic microstructure, screening out the electromagnetic characteristic parameters as input, and establishing and adjusting a deep neural network representation model of the characteristic microstructure based on the electromagnetic characteristic parameters of the magnetic domain reversible and irreversible motion. According to the invention, nondestructive testing of the average grain size of the ferromagnetic metal material is realized.

The present invention discloses a device and a method for inspecting furnace catalyst tubes. The device comprises two eddy current sensors consisting of an eddy current excitation coil and a Hall effect sensor, wherein the second of these sensors also includes a yoke where permanent magnets are positioned on its sides. The permanent magnets cause an external surface layer of oxides on the surface of the tubes to be magnetically saturated, allowing the eddy currents generated by the second sensor to penetrate the interior of the tube wall. In this way, eddy current data are obtained from the interior of the tube wall by the second sensor and from the tube surface by the first sensor. These data are processed by an analyzing element that incorporates an artificial intelligence previously trained to determine the aging state of the tube based on the data obtained by the sensors. In this way, a non-destructive and real-time analysis of the aging state of the tube is achieved. The hybrid probe can be used manually to determine the aging state of a specific point on a tube or in automated inspection, in which an autonomous mobile device guides the probe along the tube, allowing real-time determination of the longitudinal profile of the aging states.

The invention relates to a direct-current excitation test method for a high-temperature superconducting synchronous phase modifier, which comprises the following steps of: connecting an adjustable direct-current power supply with a rotor coil of the high-temperature superconducting synchronous phase modifier to be tested, putting the rotor coil into a low-temperature container, and installing a magnetic field probe in a magnetic field area of the rotor coil; injecting a low-temperature medium into the low-temperature container to enable the rotor coil to reach a superconducting state; the adjustable direct-current power supply excites the rotor coil with gradually increased current until the rotor coil is quenched; and acquiring a voltage signal of the magnetic field probe and a voltage signal of the rotor coil, calculating the magnetic field intensity according to the voltage signal of the magnetic field probe, and recording the magnetic field intensity and the voltage of the rotor coil. According to the invention, the low-temperature condition of the actual use environment of the rotor coil can be simulated, the direct-current excitation test is continuously carried out through simple operation, and key performance tests of various synchronous phase modifiers such as rapid excitation test, excitation magnetic field test and critical current-carrying characteristic test are completed.

This invention relates to the technical field of magnetic testing and analysis of boiler water-cooled tube sidewalls, specifically providing a boiler water-cooled tube sidewall inspection device. The device includes a housing assembly, a magnetic module, an image acquisition module, a magnetic powder circulation mechanism, and a drive mechanism. The magnetic powder circulation mechanism includes an upper pulley, a lower pulley, and a rear guide pulley, each mounted on a wire-threading tube. An annular magnetic tape is mounted on the outer side, and the tape circulates. An internal upper powder-removing mechanism is located inside, and a lower front powder-applying mechanism is located at the bottom. The bottom of the powder-removing mechanism and the top of the powder-applying mechanism are connected by a powder-guiding tube. The upper part of the annular magnetic tape passes through the powder-removing mechanism for powder removal, and the front part of the tape adheres to the front of the powder-applying mechanism for powder application. The image acquisition module faces the inner surface of the annular magnetic tape. This invention can adaptively adjust the machine's movement speed, quickly inspecting non-critical areas and repeatedly testing at low speeds in critical areas, improving work efficiency and inspection accuracy.

The present invention discloses a nuclear magnetic resonance-based coal reservoir structure testing while-drilling probe and testing method. During the drilling process, nuclear magnetic resonance detection is performed on the coal body around the borehole in real time through the nuclear magnetic resonance probe. After the drilling construction is completed, a nuclear magnetic resonance detection process is realized, and then the borehole can be used for subsequent gas extraction. This one-time drilling has multiple functions. On the one hand, it reduces the need to drill multiple boreholes additionally. On the other hand, nuclear magnetic resonance detection can be performed during the drilling and drilling withdrawal processes respectively through nuclear magnetic resonance testing means, so as to realize real-time in-situ non-destructive monitoring of coal seams and greatly improve the validity and credibility of data. Finally, a plurality of nuclear magnetic relaxation information obtained during drilling and a plurality of nuclear magnetic relaxation information obtained during drilling withdrawal are respectively formed into a set, and judged by set standards, so as to finally determine whether the pore structure of the coal seam around the borehole has changed due to the borehole pressure relief, and then corresponding measures are taken in time according to the changes to ensure the safety of subsequent coal seam mining.

The invention discloses a device and a method for evaluating tight core imbibition and ion diffusion, and relates to the technical field of oil-gas field development. The nuclear magnetic tester can perform nuclear magnetic detection on a rock core, the nuclear magnetic tester and the holder are both arranged in the first heating box, and the first heating box is provided with a medium inlet pressure gauge, a medium outlet pressure gauge, a ring pressure gauge, a first reversing valve, a second reversing valve and a flow meter. The first temporary storage container stores fluorocarbon oil, the second temporary storage container and the first temporary storage container are connected in parallel to store an imbibition solution, and the sample container and the second temporary storage container are connected in parallel to perform drying, vacuum diffusion and constant-pressure imbibition treatment on a to-be-detected rock core; the submersible driving pump can pump media in the first temporary storage container and the second temporary storage container into the first heating box, actual high-temperature and high-pressure oil and gas reservoir conditions can be simulated, nuclear magnetic detection is conducted on a rock core at the same time, and therefore the permeability damage characteristics in the imbibition process and the occurrence and migration law of fluid in a rock sample are accurately analyzed.

The invention discloses a stack type auto-encoder-based cold rolled steel hardness electromagnetic nondestructive testing method, which comprises the following steps of: firstly, acquiring the content of martensite in a material based on electron backscatter diffraction (EBSD), and acquiring the hardness of the material based on a Vickers hardness tester; the method comprises the following steps: carrying out electromagnetic nondestructive testing on a ferromagnetic material based on a multi-magnetic testing device to obtain electromagnetic parameters representing the magnetic characteristics of the material, then analyzing the relationship between hardness and martensite content, explaining the principle that the electromagnetic characteristics represent the hardness, and then extracting deep characteristics of electromagnetic signals by using a stack type auto-encoder; the material surface hardness is classified by taking the electromagnetic characteristic parameters of the material as input and the material surface hardness as output, so that the online nondestructive testing of the hardness of the cold rolled steel is realized. The invention provides a digital and rapid evaluation means for detecting the surface hardness of the ferromagnetic steel and iron material, so that the detection efficiency is improved, and the detection cost is reduced.

The utility model relates to the technical field of unsaturated soil strength and deformation characteristic testing, and discloses a soil triaxial nuclear magnetic combined testing device which comprises a base frame, a pressure chamber structure, a pressurizing structure and a nuclear magnetic tester, the pressure chamber structure is installed on the base frame, and a pressure chamber used for containing a soil sample to be detected is formed in the pressure chamber structure; the pressurizing structure is mounted on the base frame, and the output end of the pressurizing structure is inserted into the pressure chamber to apply axial pressure to the to-be-detected soil sample; the pressure chamber structure is sleeved with the nuclear magnetic tester, and the detection end of the nuclear magnetic tester right faces the pressure chamber. According to the structure, the nuclear magnetic tester, the pressure chamber structure, the pressurization structure and the nuclear magnetic tester are integrated, the sealing performance is better, real-time online detection is facilitated, and the influence of the pressurization structure on nuclear magnetic detection is reduced. And the diameter of the pressure chamber structure is reduced, so that the pressure chamber structure can be placed in a nuclear magnetism tester, and both nuclear magnetism test and triaxial experiment are met.

The invention provides a machine for rotor magnetism testing and magnetic ring pressing. A rotor is automatically grabbed and placed on a rotor detection device through a manipulator; the rotor which is detected to be qualified by the rotor detection device is grabbed by the manipulator and moved to the magnetic detection table; the magnetic detection table driven by the lifting mechanism firstly drives the rotor to rise to a magnetic flux measuring position, and magnetic flux detection of the rotor is completed through the magnetic flux testing mechanism; the magnetic detection table drives the rotor to descend to a meter magnetic measurement position, and the meter magnetic quantity detection of the rotor is completed through a meter magnetic measurement mechanism; the rotor detected to be qualified by the magnetism testing device is grabbed by the transverse moving mechanism from the magnetism detecting table and placed on the pressing ring loading table, and the pressing mechanism presses the magnetic ring downwards so that the magnetic ring can be connected to the rotor in a sleeved mode. According to the technical scheme provided by the invention, the automatic technological process of rotor detection, magnetic test and magnetic ring press fitting can be realized, and the production detection efficiency is greatly improved.

This invention provides a magnetic testing device. The device includes: a mounting frame; and a sample fixing structure mounted on the mounting frame. The sample fixing structure includes a sample rod and a sample holder, connected to the sample rod. The sample holder includes a main body and a clamping structure mounted on the main body. The clamping structure includes at least two clamping members arranged opposite each other along a first direction, forming a sample clamping space between the at least two clamping members. This invention solves the problem that when using existing sample fixing structures for magnetic testing, the sample easily slips off the glass slide when the sample holder resonates with the sample fixing structure.

Device (1) for non-invasive measurement of the position of Hall sensors installed in a component (9), comprising - a positioning device (3) for the fixable mounting of the component (9) with at least one sensor (2) to be measured, - a rotary encoder wheel (5) mounted about an axis (4) for generating a temporally and spatially defined magnetic test signal and - at least one reference sensor (6) for determining a reference position of the encoder wheel (5), - wherein at least one magnet (27) with a predetermined polarity is arranged on the encoder wheel (5) to generate the test signal, and wherein the component (9) is fixed in a predetermined position in the device (1) by means of a reference mounting surface (14) and / or a reference pin (15).

The embodiment of the invention discloses a fracturing fluid intrusion detection method and device, electronic equipment and a storage medium. The method comprises the following steps: configuring a target rock core in a high-temperature and high-pressure nuclear magnetic resonance tester in a nuclear magnetic resonance testing system, and performing a fracturing fluid injection test on the target rock core in a uniform nuclear magnetic field corresponding to the nuclear magnetic resonance tester to obtain first nuclear magnetic resonance signal change information along with time; performing a fracturing fluid injection test on the target rock core in a gradient nuclear magnetic field corresponding to the nuclear magnetic resonance tester to obtain multiple pieces of second nuclear magnetic resonance signal change information along with time; and based on the first nuclear magnetic resonance signal change information and the multiple pieces of second nuclear magnetic resonance signal change information, the invasion depth and invasion amount of the fracturing fluid in the shale reservoir are determined. According to the technical scheme of the embodiment of the invention, the invasion depth and invasion amount of the fracturing fluid are calculated according to the uniform nuclear magnetic test and gradient nuclear magnetic test signal change information, and the efficiency and accuracy of calculating the consumption of the fracturing fluid and predicting the flowback rate during drilling operation are improved.

The invention discloses a bevel gear-based non-magnetic testing device and method, and the device comprises a driving mechanism, a first rotating shaft, a first bevel gear, a second bevel gear, and a second rotating shaft, the first bevel gear is fixedly connected with the first rotating shaft, the driving mechanism drives the first rotating shaft to drive the first bevel gear to rotate, the first bevel gear transmits the rotation to the second bevel gear, and the second bevel gear is connected with the second rotating shaft. Rotating the second bevel gear around the second rotating shaft; the second bevel gear serves as a carrying platform and is used for carrying an object to be measured, and by setting the tooth meshing angle of the first bevel gear and the second bevel gear, under the condition that the direction of the first rotating shaft is fixed, the object to be measured carried on the second rotating shaft obtains the measurement angle in any direction of the space. The bevel gear is used for carrying the to-be-measured object, the rotating shaft of the rotary table and the rotating shaft of the driving mechanism form any angle, the structure is compact, the use flexibility is improved, and the device is suitable for being used in a closed magnetic shielding space with a small number of openings.

The invention discloses a coal body fissure channel water and methane flow visualization system and a coal body fissure channel water and methane flow visualization method. Comprising a methane gas cylinder, a fluorescent powder injection device, a fluorescent aerosol preparation device, a fluorescent aerosol pressurizing injection device, a hydraulic injection device, a water tank, a visual coal sample coating device, a nuclear magnetism testing device, a computer data acquisition device, an oil pump, a back pressure valve and a vacuum pump, the visual coal sample coating device comprises a visual top cover, a visual base, a visual pressure head, a fluorescence imaging camera, a rotary gasket, a rotary valve and a coal sample; according to the device, the defects in the prior art are overcome, fluorescent powder and methane gas can be mixed to form fluorescent aerosol, and after the fluorescent aerosol is injected into coal sample cracks, flowing and distribution visualization of the methane gas is achieved through the fluorescent imaging camera; the flowing process of water in the coal sample fracture channel is observed in combination with a nuclear magnetic testing device, so that the two-phase flow dynamic migration process of the water and the methane gas in the coal sample fracture channel is visualized.

The invention discloses a magnetic material soft magnetic performance measuring device and method, relates to the technical field of magnetic material soft magnetic performance measurement, and aims to solve the problem that the soft magnetic performance of a magnetic material under different stresses in a weak magnetic environment cannot be accurately measured in the prior art. The device comprises a permalloy magnetic shielding cylinder for providing a weak magnetic environment for a magnetic ring and a small tension-compression stress machine for applying stress to the magnetic ring, wherein a coil group is arranged on the surface of the magnetic ring; a magnetic ring non-magnetic testing mold is arranged in the permalloy magnetic shielding cylinder, the small tension and compression stress machine is connected with a first upper computer, a soft magnetic material measuring device is arranged on the outer side of the permalloy magnetic shielding cylinder, and the soft magnetic material measuring device is respectively connected with a second upper computer and a coil group; the invention further comprises a corresponding measuring method. The soft magnetic performance of the magnetic material under different stresses in the weak magnetic environment can be accurately measured, the stress characteristic of the soft magnetic performance of the magnetic material can be explored, and the method has important significance for guiding the design of an inner magnetic shielding layer of a high-performance magnetic shielding system.

The invention discloses a CO2 flooding asphaltene blocking degree quantitative calculation method, and relates to the technical field of oil and gas field development. According to the technical scheme, the method comprises the following steps: executing on-line core in-situ condition nuclear magnetic testing: preparing a solution for saturating a core, preparing a saturated rock sample, determining a static pore throat nuclear magnetic T2 spectrum, determining a CO2 displacement process nuclear magnetic T2 spectrum, and determining a CO2 displacement post-nuclear magnetic T2 spectrum; the permeability damage rate and the porosity damage rate of the rock core are calculated by respectively obtaining static pore throat nuclear magnetic T2 spectrums and CO2 displacement process nuclear magnetic T2 spectrums of different rock cores, so that the CO2 displacement asphaltene blockage index is obtained. The method has the beneficial effects that the core in-situ condition on-line nuclear magnetic experiment is adopted, the micro-pore structure characteristics of the reservoir core are classified and researched, the CO2 displacement micro-dynamic process is observed by using the representative real core, the asphaltene and wax blocking degree of each stage can be quantitatively analyzed, the observation and operation are simple, the cost is low, and the method is suitable for large-scale popularization and application. And the support is provided for improving the recovery efficiency and reducing the residual oil distribution in the later-stage work of the oil field.

The invention discloses a non-magnetic compression load loading device and a non-magnetic compression load loading method suitable for a magnetic shielding cylinder, and provides a completely non-magnetic compression loading device, which can reduce the interference of loading on a magnetic test, realize load control through a mechanical structure, prevent an external sensor from introducing magnetic pollution, and improve the reliability of the magnetic shielding cylinder. The loading device is miniaturized and non-magnetized, so that the defects of a conventional method can be effectively avoided, and the sealing property of the magnetic shielding cylinder can be maintained. According to the embodiment of the invention, the test sample is loaded by using the bolt according to the relation between the bolt torque and the axial force, so that the miniaturization of the loading device is realized.

The invention relates to the technical field of total iron content detection, in particular to a total iron content detection method for iron ore, which comprises the following steps: acquiring the ore body form of the iron ore to be surveyed to determine a plurality of sampling points, and collecting samples; respectively carrying out magnetic testing on each ore sample to determine the magnetic characteristics of the corresponding ore; according to the magnetic characteristics, determining whether sample preliminary detection is performed on the ore sample so as to determine the ore type of the position where the ore sample is located; and determining a corresponding total iron content detection method in response to the ore type. Through scientific sampling, accurate determination of ore types and matching of a detection method, sample representativeness and analysis accuracy are improved, and errors are reduced; the process is simplified to adapt to field exploration, the cost is reduced, and a reliable basis is provided for iron ore exploration and subsequent development.

The invention provides a method and a device for quantitatively calculating the total organic carbon content of an oil reservoir and identifying a dessert section of the oil reservoir. The method comprises the following steps: taking a plunger rock sample and parallel samples with the same depth; carrying out T1-T2 two-dimensional nuclear magnetic testing on the sample feeding state and different drying states of the plunger rock sample; determining a distribution range of the organic holes in the target block in the T1-T2 two-dimensional spectrum and a corresponding identification standard; according to the standard, the organic pore volume of all plunger samples in the optimal state two-dimensional nuclear magnetic experiment data is counted, and an empirical equation between the two is determined by combining TOC experiment results of parallel samples; and for two-dimensional nuclear magnetic logging of a new well in a target block, calculating the organic pore volume by adopting the standard, and further calculating the total organic carbon content TOC of the shale oil reservoir by adopting the empirical equation. The curve and a geometric mean curve of a transverse relaxation T2 spectrum of two-dimensional nuclear magnetic logging are comprehensively analyzed, sweet spot sections which are good in oiliness and beneficial to output can be rapidly recognized, and a decision basis is provided for optimization of an oil testing scheme.

The application provides a satellite dynamic magnetic compensation method and system, which comprises the following steps: performing magnetic test on the satellite to obtain the magnetic moment of the satellite under each working condition; determining the dynamic magnetic compensation magnetic moment required by the working condition of the load, so that the magnetic moment of the working condition of the load after compensation is within the interval formed by the magnetic moments under other working conditions; calculating the dynamic magnetic compensation loop area according to the dynamic magnetic compensation magnetic moment and the load power supply current under the working condition of the load, and determining the loop current direction; winding the current loop according to the loop area and the current direction requirement according to the positive line or the negative line of the load power supply cable to form the dynamic magnetic compensation loop; performing magnetic test on the satellite to confirm the dynamic magnetic compensation effect. The application solves the problem that the dynamic magnetic moment of the satellite during the intermittent work of the load cannot be effectively compensated when the satellite is statically compensated by using permanent magnetic material. The application does not need to additionally configure active magnetic compensation equipment on the satellite, and has the advantages of simplicity, economy and effective dynamic compensation of the magnetic moment during the work of the load.

The invention provides a three-dimensional magnetic field coil design method suitable for magnetic compensation of a brain magnetic test area. The method comprises the following steps: S1, constructing an analytical model cylindrical coordinate system in the brain magnetic test area; s2, constructing a magnetic field analytical equation; s3, linearly superposing the barrel bottom fan-shaped coil pair and the barrel side saddle-shaped coil to form a radial coil based on a magnetic field analytical equation, and superposing the barrel side annular coil pair to form an axial coil, then optimizing the structural parameters of the radial coil and the axial coil based on an intelligent optimization algorithm, and constructing to obtain three groups of shimming coils and five groups of mutually independent linear gradient coils; and S4, describing interference magnetic field distribution in the brain magnetic test area through a vector spherical harmonic function, and adjusting the magnitude of current flowing in the coil so as to be matched with the interference magnetic field distribution. The method has the beneficial effects that the compensation coil capable of being highly matched with the magnetic field distribution trend of the brain magnetic test area under the interference condition can be designed, and the residual magnetic field in the single-end-opened cylindrical alloy barrel is accurately compensated.

Device (10) for magnetically testing a chain (11) with several chain links (12), wherein the device (10) can be arranged on an axial section (21) of the chain (11) and is movable relative to the chain (11) or conversely the chain (11) is movable relative to the device (10) in the longitudinal direction (45a) of the chain (11), comprising: - a magnet arrangement (20) with several magnets which are configured to form a magnetic field (22) in the axial section (21), preferably in the longitudinal direction (45a) of the chain (11); - a guide device (19) for guiding the chain (11); - a sensor arrangement (24) with a plurality of magnetic field sensors (25) which are arranged in a sensor area (43) in the axial section (21) on a line (26) encircling the chain (11);- a length measuring device (27) configured to determine the relative path length (33) between the sensor arrangement (24) and the chain (11), wherein the length measuring device (27) has several magnetic field sensors (53) arranged longitudinally (45a) to the chain (11), which are configured to detect relative movements between the device (10) and the chain (11); and - an evaluation unit (30) configured to receive measurement data (31) from the magnetic field sensors (25), to assign these data to a circumferential position (32) and the detected path length (33) with spatial resolution, and to detect defects (34) in the chain (11) in the spatially resolved measurement data (31).