143 results about "Magnetic parameter" patented technology

Chargers which can be connected to batteries with different charging requirements and which have an identification device for identification of the different batteries are disclosed. With these chargers, the different types of batteries are recognized by a magnetic identification device. In a first exemplary embodiment, the identification device comprises at least one magnetic sensor, which is arranged in or on the charger and detects at least one magnetic parameter of a magnetic element, which is mounted in or on the battery. In a second exemplary embodiment, the identification device has at least one magnetic element and at least one magnetic sensor for detection of at least one magnetic parameter of the at least one magnetic element. The battery comprises a shielding and / or amplifying device, which alter(s) the at least one magnetic parameter of the at least one magnetic element.

The present invention, in various embodiments, is directed to a geophysical system and method in which a transmitter coil is oriented with its axis horizontally, and a sensor is positioned below the coil to measure an ambient electrical and / or magnetic parameter associated with a conductive medium surrounding the at least one transmitter coil.

High-frequency resonance method is used to measure magnetic parameters of magnetic thin film stacks that show magnetoresistance including MTJs and giant magnetoresistance spin valves. The thin film sample can be unpatterned. Probe tips are electrically connected to the surface of the film (or alternatively one probe tip can be punched into the thin film stack) and voltage measurements are taken while injecting high frequency oscillating current between them to cause a change in electrical resistance when one of the layers in the magnetic film stack changes direction. A measured resonance curve can be determined from voltages at different current frequencies. The damping, related to the width of the resonance curve peak, is determined through curve fitting. In embodiments of the invention a variable magnetic field is also applied to vary the resonance frequency and extract the magnetic anisotropy and / or magnetic saturation of the magnetic layers.

The invention provides a method for testing material electromagnetic parameters based on an artificial magnetic conductor rectangular waveguide, and belongs to the technical field of material electromagnetic parameter test methods. The method comprises: using a vector network analyzer to test S parameters of two input (output) ports of a rectangular waveguide based on artificial magnetic conductors, the rectangular waveguide being provided with a to-be-tested medium material, the S parameters comprising a first reflection characteristic S11 and second reflection characteristic S22, a first transmission characteristic S12 and a second transmission characteristic S21; and then using the following formula to calculate relative dielectric constant and relative permeability of the material. The rectangular waveguide based on the artificial magnetic conductors can transmit electromagnetic waves whose frequency is as low as frequency of DC. The method has at least two advantages when being used in tests of material electromagnetic parameters: first, electromagnetic parameters of the materials can be obtained in a very wide frequency range, and second, volume of a tested material can be greatly reduced.

The invention provides a magnetic target tracking method based on a magnetic anomaly gradient. Through carrying out matrix transformation on the magnetic anomaly gradient, a unit direction vector of a target magnetic moment is separated, an optimization problem is formulated to estimate the position and magnetic parameters of the target, and through constructing a special fitness function, a particle swarm optimization algorithm is used to solve the target parameters. According to the target tracking method based on the magnetic anomaly gradient, a new idea is provided for target positioning by using geomagnetic total field information, the method can solve the information of moving target velocity, and certain reference meaning is realized in positioning and tracking of the magnetic target.

The invention discloses a correction method of an electronic compass in an underwater vehicle, which comprises the following steps of: inquiring magnetic declination, and carrying out corrected navigation on the water surface of the vehicle; recording navigation data by a navigation sensor; exporting correction navigation data from a communication module; searching a hard magnetic interference parameter, solving the error surface plot between a correction track and a reference track under the condition of (2N+1)<2> disperse hard magnetic interference parameters, wherein the minimum point corresponding to the surface plot is the search result; according to the set correction precision requirement, repeating and reducing the search range and grid, and re-searching to obtain a more precise hard magnetic interference parameter evaluation value; and finally, applying the searched magnetic parameter evaluation value in the navigation of the underwater vehicle. The method disclosed by the invention has the advantages that the operation is simple, the influence of the outer magnetic interference to the electronic compass in the underwater vehicle can be effectively eliminated and thus, the corrected electronic compass can return back to the corrected attitude angle.

Sensors for outputting signals indicative of a rate of change of torque experienced by a magnetized member in response to a change in torque experienced by the member are described. Such sensors include at least one sense element capable of detecting a change in a magnetic parameter of a magnetized region of the member positioned proximate to the sense element in response to a change in torque applied to the member. Devices for detecting and / or measuring rates of changes in or of torque that employ one or more of these sensors are also described, as are various applications for such devices.

The invention relates to a device for measuring internal stress of ferromagnetic material by pulse electromagnetic field. It is composed of detector, pulse electromagnetic field circuit and data acquisition and processing device, the detector part is composed of drive coil (7), heel piece (9) with one fieldpole and two measure poles and two groups of induction coil (8, 8'), weighing cell (4) is placed above the detector (5), the detector (5) is placed above the tested workpiece (6), which are clamped by jig; the pulse electromagnetic field circuit provides 1-3 Tesla strong incentive pulsed electromagnetic field for drive coil (7), the current signal in drive coil (7), the voltage signals of the two groups of drive coils (8, 8') are processed by data acquisition and processing device, then the magnetization curve and magnetic hysteresis loop of the tested workpiece (6) are obtained, after various kinds of magnetic parameters of the tested workpiece are determined, the rating curve between the internal stress and various kinds of magnetic parameters are established.

The invention discloses a spectrum magneto-optical ellipsometry analysis device of a rotary compensator as well as application thereof. The spectrum magneto-optical ellipsometry analysis device comprises a light source module, a light path module, a magnetic field module, a sample table, a motor control module and a detection and analysis module, the light path module comprises a collimating lens,a polarizer, a compensator and a polarization analyzer, the detection and analysis module comprises a computer and a detector, the collimating lens, the polarizer, the compensator, the sample table,the polarization analyzer and the detector are sequentially arranged along a light path direction, the polarizer and the compensator are located in an incidence light path, the polarization analyzer is located in an emergence light path, and the incidence light path and the emergence light path are located at the two sides of the sample table and respectively keep an included angle Phi with normalof the sample table. The device disclosed by the invention can represent optical and magnetic parameters of a magnetic film material under longitudinal or poloidal magneto-optical Kerr effect, can obtain thickness, optical parameters and magnetic parameters of a magnetic film sample during one test and is relatively high in automation degree.

The invention discloses a Barkhausen noise lossless measuring method and system for a ferromagnetic material local stress and strain field. A hard disc magnetic head is used for detecting a Barkhausennoise signal in a cyclic magnetization process of a ferromagnetic material, multiple extracted magnetic parameters are input to a pre-established force-magnetic parameter mapping relation neural network model, and a size of the stress or the strain is quantitatively forecasted. The hard disc magnetic head of which a magnetic core terminal air gap is smaller than 1 um is carried by a three-axis moving platform and used for scanning along a local area range of the measured material. A Barkhausen noise detecting device is capable of synchronously detecting the Barkhausen noise signal. The neuralnetwork model is capable of forecasting the size of the stress or the strain of a scanning point, and acquiring the stress field or the strain field within the local area range of the material afterscanning. So a relation of the Barkhausen noise signal in the ferromagnetic material and the stress and strain is calibrated, and rapid and lossless quantitative detection is performed on the local stress and strain field.

The invention discloses a method for testing the water content of foamed asphalt, and relates to material testing or analysis with nuclear magnetic resonance. The water content of the foamed asphalt is measured by a nuclear magnetic resonance device. The method comprises the following steps: preparing a foamed asphalt test sample of which the water content is to be tested; setting a nuclear magnetic parameter of the nuclear magnetic resonance device; acquiring a nuclear magnetic resonance semaphore of each gram of asphalt from which impurities are removed; determining a relationship between the water content of a standard test sample and a nuclear magnetic resonance semaphore; acquiring a total nuclear magnetic resonance semaphore of the foamed asphalt test sample of which the water content is to be tested; acquiring the mass of foamed asphalt evaporation residues in the foamed asphalt test sample of which the water content is to be tested; calculating the water content of the foamed asphalt test sample of which the water content is to be tested. According to the method, the defect of incapability of a method in the prior art to measurement of the water content of the foamed asphalt and the defects of an industrial CT method, disclosed in CN103558236A, for testing the water distribution of an asphalt mixture are overcome.

The invention relates to a joint inversion method of gravity and magnetic data based on correlation constraints of a sinusoidal function. A method using the square of a density parameter and the square of a magnetic parameter to replace the density parameter and the magnetic parameter is put forward. The sinusoidal function is related to the cross-multiplication of two parameter vectors and the expression and the derivative become simple and visual, so that the stability of the joint inversion is improved effectively. Compared with the prior art, the method has the following advantages: the correlation constraint of the sinusoidal function is applied to the joint inversion method of the gravity and magnetic data and the occurrence of the singularity is avoided effectively when the conjugate gradient algorithm is used for solving the optimal solution of the objective function, so that the joint inversion stability is improved. When the new correlation constraint condition is calculated,the method using the square of a density parameter and the square of a magnetic parameter to replace the density parameter and the magnetic parameter is employed and thus the method is also suitablefor the condition of local correlation but global un-correlation caused by non-same-number changing of the density parameter and the magnetic parameter of the global geologic body, so that the methodhas a wide application range.

The invention relates to a plane measurement method and an apparatus for a total field magnetometer measuring rock and a magnetic parameter of ore specimen. The employed plane measurement apparatus comprises a total field magnetometer, a specimen box with specimen in the box, a flat and flat supports. The total field magnetometer includes probes and probe supports. According to the invention, parameters measured by the total field magnetometer are inserted into formulas so as to obtain a magnetic susceptibility K and a residual magnetization Mr of specimen parameters. According to an appendix C of Technical Regulations on Ground High-precision Magnetic Survey in China, an apparatus of the total field magnetometer measuring rock and the magnetic parameter of the ore specimen is an oblique measurement apparatus. According to the invention, the oblique measurement is modified into plane measurement. Therefore, with utilization of the plane measurement apparatus, errors caused by inaccurate slope adjustment can be avoided. Moreover, with utilization of the oblique measurement apparatus, the rock and ore specimens are overturned and vibrated on the oblique surface, so that inclined displacement is caused and thus a maximum error of deviation in range is caused; however, the above-mentioned problem can be solved according to the invention. the plane measurement apparatus provided in the invention has advantages of simple structure and firmness; besides, the precision of the magnetic parameter measurement of the rock and ore specimens can be improved.

The invention discloses a multifunctional soft magnetic material measuring device which comprises an instrument main frame with a hollow channel, and an instrument main panel arranged on the instrument main frame, wherein, a through hole corresponding to the hollow channel of the instrument main frame is formed in the middle of the instrument main panel; the through hole passing through the instrument main panel is inserted into a central device in the hollow channel of the instrument main frame; a measured sample is positioned in the central device; and the instrument main panel is used for fixing the central device and the measured sample in the central device. The invention has the advantages of simple structure, convenient operation, fast measurement and exact results, and realizes the measurement to the four magnetic parameters (i.e. the initial permeability, the saturation magnetic induction, the magnetic anisotropy constant and the magnetostriction constant) of the same zonal soft magnetic material by using one instrument.

In a method and apparatus for magnetic resonance (MR) imaging, a result image is provided based on multiple MR contrasts. The result image is indicative of a value of a magnetic parameter. MR data are acquired for the multiple contrasts at different time points, in each case following preparation of a magnetization. During the acquisition of the MR data, k-space is undersampled according to a respective undersampling scheme. The undersampling schemes of the different MR contrasts are different from one another.

Embodiments of the invention provide a method and a device for measuring the complex magnetic permeability of a sheet material. The method comprises the following steps: a first air region, a to-be-measured sample placing area and a second air area are sequentially arranged in a dielectric layer between a grounding plate of a microstrip line and a conduction band, and the to-be-measured sample placing area is filled with a to-be-measured thin film material; and characteristic impedance and propagation constants of two ports of the microstrip line are obtained on the basis of a transmission reflection method, relative dielectric constants of the two ports of the microstrip line are obtained on the basis of relations between electromagnetic parameters of the material and the characteristic impedance and between the electromagnetic parameters of the material and the propagation constants, and the complex magnetic conductivity of the to-be-measured thin film material is obtained on the basis of the relative dielectric constants. Based on the measurement of an S parameter after a sample is added in a broadband test process, the characteristic impedance of the microstrip line filled withthe to-be-measured thin film material is calculated by utilizing the transmission reflection method; the relative dielectric constants of the two ports of the microstrip line are calculated accordingto the relations between the electromagnetic parameters and the characteristic impedance; and then the complex magnetic conductivity in a test frequency band range is calculated. The method and the device have the characteristics of wide test frequency band, high repeatability, simple structure and the like.

The invention provides an underground target magnetic positioning and tracking method and a system corresponding to the method. The method comprises the following steps: modeling magnetic equipment carried by a target as a magnetic dipole; acquiring magnetic parameters of the equivalent magnetic dipole; arranging magnetic sensor arrays and performing data acquisition; performing solution and inversion by utilizing a non-linear minimum partial least square through building a measuring equation between of a magnetic dipole equivalent target and the sensor data so as to acquire magnetic dipole equivalent target model parameters; and modeling an effective evidence of a model solution result by utilizing the magnetic dipole equivalent target model parameters so as to acquire point tracks of thetarget by adopting effective tracking points of the magnetic dipole equivalent target. According to the underground target magnetic positioning and tracking method disclosed by the invention and themodel solution result effective evidence as well as a built system, interference caused by an environment is reduced, the method and the system have higher probing precision, and a real-time requirement of a probing positioning system is met.

The present invention discloses a high-resolution Barkhausen noise and incremental permeability scanning imaging system. An upper computer controls a multi-functional electromagnetic detection deviceto perform detection of feature magnetic signals such as localization Barkhausen noise, the eddy and the incremental permeability for a ferromagnetic block or magnetic film materials, software in theupper computer can extract at least 14 items of magnetic parameters from the detected feature magnetic signals; a triaxial movement platform is employed to carry a magnetic head in the electromagneticdetection device to perform plane scanning of the ferromagnetic block or the magnetic film materials to obtain a magnetic parameter space distribution imaging result; and the air gap width of a tailend of a magnetic core employed by the magnetic head is changed about 0.2-10[Mu]m, and the lateral resolution of the magnetic head can be regulated in the range of 10-100 [Mu]m. The distribution stateof a plurality of magnetic parameters at the surface of a testpiece is measured to achieve magnetic property imaging so as to reflect the distribution state of the microstructures and the residual stresses in the materials.

Sensors for outputting signals indicative of a rate of change of torque experienced by a magnetized member in response to a change in torque experienced by the member are described. Such sensors include at least one sense element capable of detecting a change in a magnetic parameter of a magnetized region of the member positioned proximate to the sense element in response to a change in torque applied to the member. Devices for detecting and / or measuring rates of changes in or of torque that employ one or more of these sensors are also described, as are various applications for such devices.

A detector unit apparatus and method for operating and producing a detector unit to be adapted to varying environmental influences or to its own, in particular mechanical, electrical or magnetic parameters of the detector unit, which are dependent on measuring lengths. An inventive positional sensor operating according to the running time principle of a mechanically elastic shaft and comprising a waveguide, a positional element, e.g. a positional magnet, which can be displaced in particular along the waveguide, in addition to a detector assembly that is located on the waveguide and comprises a detector coil wherein the detector assembly has a current source so that a current can flow through the detector coil.

The invention discloses BaTiO3 / Co3O4 oxide complex-phase millimeter wave absorbing powder having multi-stage microstructure distribution and a preparation method. The complex-phase millimeter wave absorbing powder having multi-stage microstructure distribution is obtained by firstly preparing precursor powder through a sol-gel method, performing ball milling, then executing the multi-step regulation and control heat treatment process including decomposition, control nucleation, dense growth and the like in a high temperature furnace to obtain a complex-phase sintering sample and finally controlling ball milling. The electric and magnetic parameter resonance phenomena of the BaTiO3 / Co3O4 oxide complex-phase millimeter wave absorbing powder under the millimeter wave characteristic frequencybands are successively achieved, the frequency of their wave absorbing frequency bands is 35GHz in a typical millimeter wave window, the frequency band width can be up to 5 GHz, an RL value reaches -40 dB. The preparation method of the complex-phase millimeter wave absorbing powder is simple in preparation process and low in cost, and can be widely used in the fields of millimeter wave electromagnetic shielding and invisibility.

The invention relates to a gravel pack filling monitoring system and method. The gravel pack filling monitoring system comprises a magnetic particle container, a gravel pack container, a gravel pack mixer, a sand-carrying fluid container, a sand mixing truck, a high-pressure pumping set, a data acquisition and processing center, a ground magnetometer, a magnetic particle conveying pipeline, a gravel pack conveying pipeline, a evenly-mixing gravel pack conveying pipeline, a sand-carrying fluid conveying pipeline, a first sand-mixing fluid conveying pipeline, a second sand-mixing fluid conveying pipeline and a ground magnetometer and data acquisition and processing center communication pipeline, wherein the ground magnetometer monitors magnetic parameter changing from the ground, the data acquisition and processing center is connected with the data acquisition and processing center communication pipeline through the ground magnetometer, and the data acquisition and processing center collects and stores the measured information of the ground magnetometer and calculates and displays the gravel pack distribution state. The gravel pack filling monitoring system can track the transporting and distributing state of gravel pack in a sand-prevention well section from the ground, the well and / or an adjacent well during gravel pack filling and can achieve repeated detection on gravel pack distribution after production of the sand-prevention well.

The invention relates to a magnetic coin high-speed identification device, wherein the identification of the authenticity of coins comprises the following steps of: scanning magnetic parameters of the surface of a sample to be detected to acquire fluctuation signals of the magnetic parameters of the surface of the sample to be detected, and comparing the acquired fluctuation signals with the preset fluctuation signals of real coins to identify the authenticity of the sample. The device of the invention is provided with a coin centrifugally driving system, a control system, a coin surface magnetic signal acquiring system, a data analyzing system and a false coin eliminating system, wherein the coin centrifugally driving system sequences coins in a special coin channel and enables the coins to pass through the special coin channel at high speed; the control system controls coordinated actions of each system and human-computer interfaces; the coin surface magnetic signal acquiring system scans magnetic signal fluctuation of coin surfaces when the coins pass through the system; when the coins pass through a sensor at high speed, the magnetic sensor acquires three groups of fluctuation signals and converts the signals into digital signals, and the data analyzing system compares the scanning signals with the digital signals for analyzing; and the false coin eliminating system strikes false coins by using an electromagnetic valve according to control system signals, thereby eliminating the false coins.

A method for monitoring a building structure, having construction and reinforcement elements with pre-calculated threshold stretching and compression loads, comprises—determining actual stretching and compression loads developed therein based on data measured for the loads, —comparing the determined loads with the corresponding pre-calculated loads, and —displaying the determined loads and the compared results on a monitoring terminal, wherein the measured data are generated in real time or in a predetermined time mode, and obtained by measuring deviations of electric or magnetic parameters at the reinforcement elements, and by compression-measuring sensors installed between the construction elements. A system for determination of failure conditions of the building structure includes a monitoring device capable of connecting to stretching and compression loads measuring means. The device includes a terminal associated with the measuring means, capable of processing the loads data in real time or within a pre-set time interval, and displaying the data.

The invention discloses an experimental method of using a digital storage oscilloscope to observe an alternating current magnetic hysteresis loop, and belongs to the technical field of electromagnetic testing. The experimental method aims to reducing the distortion of testing the alternating current magnetic hysteresis loop, and improve the precision of testing dynamic magnetic parameters. According to the experimental method, firstly an alternating current triangular wave constant flow source circuit is designed, a magnet exciting coil is arranged as the load of the alternating current triangular wave constant flow source circuit, and the weave shape of magnetic field intensity H is enabled to be a triangular wave. The negative feedback sample resistance R1 of the alternating current triangular wave constant flow source circuit is the sample resistance of an exciting current, and the terminal voltage VH of the alternating current triangular wave constant flow source circuit is transmitted to the input end X of an oscilloscope. A test coil outputs voltage e2, and VB is obtained through the integration of an electronic integrator and is transmitted to the input end Y of the oscilloscope. The oscilloscope displays the alternating current magnetic hysteresis loop through XY scanning. In a measurement process, the rate of the change of H is enabled to be unchanged, the change rule of B is observed under the condition that H evenly changes, and the tested magnetic hysteresis loop is enabled be capable of reflecting the function relationship between the numerical values of B and H inside a sample better. The e2 replaces the VB to be sent to the input end Y of the oscilloscope, and a differential permeability mu d-H curve can be directly displayed.

The present invention discloses a magnetic Barkhausen and magnetic parameter sensor and a measurement method of a magnetic Barkhausen and magnetic parameter. The sensor comprises: a signal transmission interface electrically connected with an excitation coil and a signal receiving assembly and configured to transmit excitation signals to the excitation coil for receiving signals returned by the signal receiving assembly; the excitation coil encircled at one end of a magnet yoke and configured to trigger a magnetic parameter measurement assembly; the induction coil, in the magnetic parameter measurement assembly, encircled at the other end of the magnet yoke and configured to return a first feedback signal according to the excitation signals; and a Barkhausen signal measurement assembly connected with a housing and configured to return a second feedback signal according to the excitation signals. The problems are solved that the detection efficiency is reduced and the material state of metal materials cannot be comprehensively evaluated due to the lack of a technology capable of measuring a Barkhausen noise and magnetism parameters of the metal structure materials at the same time in the same detection device in the correlation technology.