49 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 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.

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 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.

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 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 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).

The invention relates to a magnetic force testing device, method, system and equipment for intelligent wearable equipment, the magnetic force testing device for the intelligent wearable equipment comprises a testing shell and a testing mechanism arranged in the testing shell, the testing mechanism comprises a rotary testing jig used for installing a to-be-tested component for magnetic force testing, and the rotary testing jig is arranged on the testing shell. The rotary test fixture comprises a rotary table, and a first clamp and a second clamp which are mounted on the rotary table and used for clamping a to-be-tested component, and scales are arranged on the rotary table; and the driving source is in transmission connection with the turntable and is used for driving the turntable to rotate so as to perform magnetic force testing on the to-be-tested component. According to the intelligent wearable magnetic force testing device, the magnetic force of the to-be-tested component is automatically tested through the driving source and the rotary testing jig, and the testing efficiency is high; the intelligent wearable magnetic force testing device is simple in structure and low in testing cost; the technical problems of manual operation, high cost and low test efficiency of the magnetic force test of the existing intelligent wearable device are solved.

A method for identifying indications in an object via non-destructive testing using inspection equipment comprising a probe is described. The method includes: recording test data corresponding to a signal measurement acquired by the probe; processing the test data using a first analysis machine learning algorithm trained to output a list of detected landmarks; processing the list of detected landmarks to identify regions in the object based on the landmarks; processing the test data and the identified regions using a second analysis machine learning algorithm to output a list of detected indications; processing the list of indications to automatically classify each indication according to one of a plurality of predefined indication types; and outputting the classified indications in a report specifying positions of the classified indications in the object. A corresponding system and non-transitory computer-readable medium are also described.

The invention discloses a carbonate rock gas reservoir water invasion simulation evaluation method and device. The water invasion simulation evaluation method comprises the steps that after the two ends of a rock core are plugged, nuclear magnetic testing is carried out under the preset temperature and pressure conditions, and a T2 spectrogram and a one-dimensional frequency coding signal in the initial state are obtained; removing the plugs at the two ends of the rock core, and carrying out nuclear magnetic test under the conditions of preset temperature and pressure to obtain a T2 spectrogram and a one-dimensional frequency coding signal measured in a saturated gas state; setting return pressure as the set core pressure, displacing displacement fluid in a high-pressure container to the core, and performing nuclear magnetic test according to a preset sampling interval to obtain T2 spectrograms and one-dimensional frequency coding signals measured at different water invasion moments until the outlet does not produce gas any more; and determining the intruding water quantity and water invasion proportion of pores with different sizes in the initial saturated gas state and different water invasion moments, the water invasion degrees in the initial saturated gas state and different water invasion moments, and the intruding water quantity and water invasion proportion of different rock core positions.

The invention discloses an antenna magnetic moment measurement method in a radiation state, and belongs to the technical field of spacecraft magnetic testing. According to the technical scheme, the magnetic field component of the antenna in the first state is measured; in the second state, the first magnetometer and the second magnetometer measure magnetic field components; when the antenna is powered up to enter a radiation state, the first magnetometer and the second magnetometer measure magnetic field components; calculating the magnetic moment variation in the third state; and calculating the total magnetic moment component of the antenna in the radiation state according to the magnetic moment component in the second state and the magnetic moment component in the third state. According to the antenna magnetic moment measurement method in the radiation state, environmental interference is eliminated by combining double magnetometers, a depolarization algorithm, a magnetic dipole algorithm and a gradient algorithm, and the distance attenuation effect is corrected through the cubic of the distance between the double magnetometers and the antenna. Therefore, the magnetic moment variable quantity of the antenna under the condition that the antenna is not electrified and the antenna is electrified and radiated and the total magnetic moment information of the antenna under the condition that the antenna is electrified and radiated can be efficiently and accurately obtained.

This invention relates to a satellite magnetic stability control method for on-orbit operating mode switching, belonging to the field of satellite magnetic stability control; it includes the following steps: Step 1, magnetic design of individual equipment; Step 2, measurement of magnetic moment change of individual equipment using the method of measuring the magnetic moment after demagnetization under zero magnetic field; Step 3, magnetic testing and magnetic compensation calibration of each individual equipment under each satellite operating mode; by reducing the magnetic moment change of individual equipment during satellite operating mode switching, the magnetic stability of the entire satellite is ensured during operating mode switching, so that the magnetic moment change of the entire satellite is minimized, thereby reducing the impact of satellite operating mode switching on in-situ magnetic field measurement tasks; this invention has the advantages of good control effect and high control accuracy for satellite magnetic control.

The utility model discloses an auxiliary device for a magnetic force test. The auxiliary device comprises a probe bracket, a plurality of probes, a carrier and a signal change-over switch, the output end of the signal change-over switch is used for being in signal connection with a magnetic signal acquisition end of a magnetic detector, and the input end of the signal change-over switch is used for being in signal connection with the probes respectively; the probe bracket is used for fixing the probe; the carrier is located above the probe support and used for placing a to-be-tested product, and the probe can penetrate through the carrier to test the to-be-tested product. The technical scheme of the utility model aims to improve the test efficiency and reduce the labor intensity of testers.

The invention discloses a device, a controller and a method for determining rock breakthrough pressure, and the device comprises a pressure difference generation device which is used for providing injection pressure difference for injection fluid; the core holder is used for placing a to-be-tested core with saturated formation water and heating the to-be-tested core to the formation temperature; the confining pressure pump is used for providing the required confining pressure for the clamping device to serve as formation pressure; the nuclear magnetic resonance testing device is used for performing nuclear magnetic testing on the core of the saturated formation water to obtain the water saturation of the core; and the controller is used for controlling each component to work so as to obtain the water saturation of the rock core when the operation of injecting the non-wetting phase fluid into the rock core to be measured is executed under the injection pressure difference of different periods. The rock breakthrough pressure can be efficiently and accurately determined based on the on-line fluid saturation test.