21results about "Permeability measurements" patented technology

The application provides a kind of bar type magnetic core effective permeability low frequency distribution measurement method and device, it is related to low frequency fluctuation detection and application technical field.The method comprises: winding test coil on coil framework, the winding length of test coil is measured and the number of turns is recorded;Test magnetic core is inserted into different positions of test coil, and the inductance of test coil is measured when test magnetic core is in different positions;According to the relationship between permeability and inductance, the area average effective permeability of test magnetic core in different positions is calculated;Based on the preset algorithm, the effective permeability distribution function of test magnetic core is fitted;According to the effective permeability distribution function of test magnetic core, the effective permeability distribution function of the bar type iron-based nanocrystalline alloy magnetic core to be measured is obtained.The application can reduce the measurement error of magnetic core effective permeability, improve the modeling reliability, and obtain the effective permeability distribution function, so as to reduce repeated experiments and improve the modeling efficiency.

This invention provides a method for constructing a magnetic property measurement system for magnetic materials based on an LLC resonant circuit, belonging to the field of switching converter technology. The measurement system includes: a DC power supply. V in Square wave generator, resonant capacitor C r Resonant inductor L r Magnetic ring, primary winding of magnetic ring L p Secondary winding of magnetic ring L s rectifier and filter capacitor C 0. Load L o And a power analyzer; wherein, the magnetic ring is made based on the magnetic material to be tested; wherein, a DC power supply V in Square wave generator, resonant capacitor C r and resonant inductor L r Connect sequentially and connect to the primary winding of the magnetic ring. L p resonant capacitor C r Resonant inductor L r and the primary winding of the magnetic ring L p excitation inductor L m Forming a resonant circuit; the rectifier is connected to the secondary winding of the magnetic ring. L s A filter capacitor is connected in parallel across the rectifier. C 0 and load L o A power analyzer is used to collect the primary-side current and secondary-side voltage of a magnetic ring to determine the magnetic characteristic parameters of the magnetic material under test. This invention can reduce the error in the measurement results of the magnetic characteristics of magnetic materials.

The application discloses a kind of anti DC bias magnetic methods and current transformers based on magnetic permeability feedback compensation, comprising: the magnetic permeability of current transformer core is acquired in real time by magnetic permeability measuring unit;According to the relationship model of magnetic permeability and DC component established in advance, the DC component of invading current transformer is determined based on the magnetic permeability acquired;DC bias compensation unit generates reverse DC counter-biasing according to the DC component determined on compensation winding.The application realizes real-time monitoring and dynamic compensation adjustment to the magnetization state of transformer core by introducing magnetic permeability measuring unit and magnetic permeability feedback control, compared with traditional open-loop compensation or simple current feedback, can more accurately judge the saturation degree of magnetic core, adjusts compensation strategy in time according to the change of magnetic core state, effectively avoids compensation lag or overcompensation problem, improves the adaptability and measurement stability of transformer in complex current environment.

This invention relates to a testing device for the magnetic properties of high-permeability materials under low-frequency weak magnetic environments, comprising: a coil assembly, a magnetic property tester, a magnetic shielding cylinder, and a host computer; the coil assembly is wound around the sample under test and connected to the magnetic property tester, and the sample under test with the coil assembly placed inside the magnetic shielding cylinder; the magnetic shielding cylinder provides a weak magnetic environment for the sample under test; the magnetic property tester is used to provide excitation current to the coil assembly and detect the induced voltage of the sample under test, and transmit the measured data to the host computer; the host computer is used to acquire the data measured by the magnetic property tester and plot the magnetization curve. The technical solution of this invention solves the problem that current magnetic property testing devices for magnetic materials cannot obtain the permeability of high-permeability materials under low-frequency weak magnetic environments, thereby improving the accuracy and precision of theoretical and simulation calculations of magnetic shielding devices and reducing the error between design and actual values.

Provided herein is a magnetic permeability measuring method including measuring a measured permeability coefficient of the magnetic material using a measuring probe; setting an analysis model corresponding to a measurement condition, and calculating, using finite element analysis, a calculated permeability coefficient of the magnetic material in the analysis model and the magnetic permeability of the magnetic material corresponding to the calculated permeability coefficient; acquiring a first set including a plurality of pairs of real-parts and imaginary-parts of the magnetic permeability corresponding to a real-part of the calculated permeability coefficient that matches a real-part of the measured permeability coefficient; acquiring a second set including a plurality of pairs of real-parts and imaginary-parts of the magnetic permeability corresponding to an imaginary-part of the calculated permeability coefficient that matches an imaginary-part of the measured permeability coefficient; and determining the magnetic permeability whose real-part and imaginary-part match in the first and second sets.

The application provides a multi-coil incremental permeability dynamic detection probe and a yield strength detection method. The probe mode of the multi-coil is used to detect different positions of materials in different magnetization states at the same time. In the movement process, the mechanical properties of the materials can be quickly and efficiently predicted. Compared with the traditional static detection mode, the dynamic detection probe can be used for continuous detection, so as to improve the detection efficiency and realize the purpose of pipeline detection operation.

This application proposes a magnetic coupling coil optimization method. The method comprises: calculating an equivalent magnetic permeability of a magnetic coupling coil based on an air gap length of the magnetic coupling coil; calculating an effective cross-sectional area of the magnetic coupling coil based on the equivalent magnetic permeability and the power of the magnetic coupling coil; calculating a number of turns of the secondary winding of the magnetic coupling coil based on the effective cross-sectional area and the equivalent magnetic permeability; optimizing the magnetic coupling coil based on the number of turns of the secondary winding. The present application can reasonably configure the parameters of the magnetic coupling coil, effectively acquire energy from the power grid to provide stable power for detection or communication equipment in the power grid, and make the magnetic coupling coil more reliable while meeting the power demand.

The invention provides a three-dimensional nonlinear magnetic material equivalent circuit model and a test method, and is applied to the technical field of power electronics. According to the model, a current source module applies bias current and excitation current to a nonlinear coupling packaging module; a plurality of node ports of the nonlinear coupling packaging module are connected with physical coupling nodes of a plurality of nonlinear coupling devices; the mapping sub-module maps the plurality of physical coupling nodes and the plurality of nonlinear coupling devices, constructs an analog nonlinear coupling circuit according to a connection coupling relation between the linear damping module and the plurality of nonlinear coupling devices, and responds to an applied bias current and an excitation current, so that the nonlinear coupling circuit is simulated. The analog nonlinear inductance unit is coupled to generate an analog induced voltage, and the analog induced voltage is applied to the linear damping module and other analog nonlinear devices through a plurality of node ports to reproduce a magnetic domain rotation coupling effect and an anisotropic hysteresis effect; the linear damping module responds to the analog induced voltage and reproduces a damping effect in combination with the analog nonlinear resistor unit.

This invention provides a method for detecting and calculating the austenite content in steel based on a permeability meter, relating to the fields of steel and electromagnetics. Based on the theoretical differences in saturation magnetization of different phases in ferromagnetic materials, this invention establishes a theoretical calculation model and detection method for measuring austenite content using a permeability meter. A standard-prepared sample is placed in a magnetic pole shoe, and the magnetic field strength H corresponding to the maximum permeability of the ferromagnetic material is first measured. μ Then at ≥1.5H μ Under a magnetic field strength of J, the polarization intensity of the magnetic field strength at multiple points was measured at continuous intervals. m Then, based on the saturation magnetization approximation law and derivation law, the saturation magnetization Js is fitted and solved. Finally, the austenite content is determined according to the theoretical calculation model of austenite content. The method described in this invention solves the influence of the constantly changing effective magnetic path length of traditional magnetometers on the measurement results. The method for determining austenite content is simple, has a solid theoretical basis, high measurement accuracy, and strong data repeatability.

The present application relates to the field of composite material electromagnetic parameter test, especially to a kind of composite material electromagnetic parameter automation test system based on vector network analysis.The present application obtains electromagnetic characteristic parameter by vector network analyzer through data acquisition module;And obtain ambient temperature;According to the electromagnetic characteristic parameter analysis electromagnetic characteristic representation value by data analysis module;Whether the electromagnetic parameter automation test system meets the standard is evaluated by standard evaluation module;The reason of not meeting the standard is determined based on ambient temperature by compensation control module;And based on the reason of not meeting the standard, it is determined to open test area temperature compensation device, or, it is determined whether to open electromagnetic shielding device.The present application improves the accuracy of the composite material electromagnetic parameter automation test system based on vector network analysis by analyzing the reason of not meeting the standard of automatic test system, and adjusting ambient temperature or eliminating electromagnetic interference according to the reason.

A method includes receiving, from a plurality of magnetic field receivers including magnetic sensors, data characterizing samples obtained by the plurality of magnetic field receivers, the samples of a combination of a first magnetic field and a second magnetic field resulting from interaction of the first magnetic field and an object; determining, using the received data, a polarizability index of the object, the polarizability index characterizing a magnetic polarizability property of the object; classifying, using the determined polarizability index, the object as threat or non-threat; and providing the classification. Related apparatus, systems, techniques, and articles are also described.

The invention discloses a magnetic conductivity detection device and method, and belongs to the technical field of soft magnetic material testing, the magnetic conductivity detection device comprises a control panel, a digital multimeter, a signal amplifier, a signal generator and a resistor unit, the control panel is provided with a first binding post group, a second binding post group, a third binding post group, a fourth binding post group and a voltage switch, the signal amplifier is configured to output a test signal to the excitation coil through the fourth binding post group, so that the excitation coil generates excitation voltage; the input end of the signal amplifier is electrically connected with the second binding post group, and the signal amplifier is configured to amplify the induction voltage of the induction coil; the voltage switch comprises a first connecting end, a second connecting end, a third connecting end and a first control end, and the first control end is configured to enable the voltage switch to output the excitation voltage or the amplified induced voltage to the digital multimeter. According to the magnetic conductivity detection device provided by the invention, the soft magnetic material can be detected under the condition of low frequency and low magnetic field.

The invention discloses an inductor failure risk response structure, a high-reliability inductor and a failure risk warning method, the inductor failure risk response structure is specifically a core-shell composite functional phase, and the functional phase takes metastable austenite microspheres as a core and borosilicate glass with density gradient as a shell. The austenite nucleus can generate martensite phase transformation under the triggering of mechanical stress to cause regular drift of the magnetic conductivity of the magnetic core, and the regular drift is used as an early warning electric signal; and the glass shell is softened and flows when being overheated, so that self-repairing of the microcracks is realized. Through the centrifugal forming technology, the functional phase can form gradient distribution with the concentration gradually decreased from inside to outside in the magnetic core, and therefore the intelligent response capacity is accurately located in a high-risk area. The manufactured high-reliability inductor has endogenous sensing, early warning and self-repairing capabilities on mechanical overload and overheating risks, and the reliability of the high-reliability inductor under severe working conditions is remarkably improved.

The application relates to a kind of non-magnetic wear-resistant band magnetic performance measurement methods, which can fully cover the magnetic field distribution measurement surface of non-magnetic wear-resistant band, accurately measure the magnetic performance parameters of non-magnetic wear-resistant band and ensure the processing quality of non-magnetic wear-resistant band.Through a magnetic induction intensity sensor probe, the magnetic induction intensity data on the corresponding inner hole center axis are collected by measuring twice in the wear-resistant ring before and after the processing procedure of non-magnetic wear-resistant ring, and the two groups of data are compared to exclude the influence of magnetic induction intensity of non-magnetic wear-resistant ring (i.e. wear-resistant band substrate), and the magnetic induction intensity data distribution on the corresponding wear-resistant band axis is obtained. By using the measurement method, the magnetic field distribution measurement surface of non-magnetic wear-resistant band can be fully covered, the magnetic performance parameters of non-magnetic wear-resistant band can be accurately measured, and the processing quality of non-magnetic wear-resistant band is ensured.

The invention discloses a wave-absorbing material complex permeability testing device and method based on adjustable coil and temperature control integration, and the testing device comprises an impedance analyzer, a program control and calculation module, and a testing clamp. The test clamp comprises a sealable sample groove, a temperature control unit, a plurality of coil groups with the number of turns set according to a preset rule, and a reed relay controllable switch. In the calibration stage of the test method, traversing coil combinations are controlled through a program to complete open circuit, short circuit and standard load calibration, multiple temperature points are covered to form a reusable calibration file, and after a to-be-tested material is injected in the test stage, coil combinations are selected through program control to complete standard load calibration. The number of turns of the coil is calculated and optimized through a formula, parameters fall into a high-precision area of the impedance analyzer, series resistance and inductance of the coil are measured, a real part and an imaginary part of the relative permeability are calculated through the formula, and continuous testing of multiple temperature points can be achieved. The precision of the impedance analyzer can be dynamically matched, the temperature stabilization time is shortened, and the method is suitable for nondestructive testing of liquid / powder materials.

The application discloses a magnetic guiding transmitting antenna while drilling, which comprises a conductive cable, a transmitting electrode elastic conductor, a transmitting electrode, a recovery electrode, a recovery electrode elastic conductor, the conductive cable is connected with the transmitting electrode elastic conductor and the recovery electrode elastic conductor, the conductive cable is used for receiving transmitting alternating current and recovery alternating current and transmitting the same to the transmitting electrode elastic conductor and the recovery electrode elastic conductor respectively, the transmitting electrode elastic conductor is connected with the transmitting electrode, the recovery electrode elastic conductor is connected with the recovery electrode, the transmitting electrode elastic conductor is used for transmitting the transmitting alternating current to the transmitting electrode, and the recovery electrode elastic conductor is used for transmitting the recovery alternating current to the recovery electrode, and the transmitting electrode transmits the transmitting alternating current to the recovery electrode through a stratum. The magnetic guiding transmitting antenna while drilling can effectively improve the efficiency of drilling operation and effectively reduce the cost of drilling operation.

The invention relates to a sensor arrangement (1) for determining and / or monitoring a process parameter of a medium (M) in a container (100). A magnetic field device (2) generates a measuring magnetic field. A detection device (4) detects a parameter related to the measuring magnetic field and thereby determines or monitors the process parameter. An additional magnetic field device (5) generates an additional magnetic field in a part (101) of the wall (102) of the container (100).

The invention discloses a method for extracting the magnetic conductivity of a magnetic deposit based on frequency domain electromagnetic inversion, and relates to the technical field of frequency domain electromagnetic sounding, and the method comprises the steps: obtaining the observation data of the electromagnetic field response of the frequency domain electromagnetic sounding; building an initial inversion model based on magnetic mineral deposit geological data; calculating prediction data of electromagnetic field response of the initial inversion model by using an electromagnetic method forward modeling algorithm; based on observation data and prediction data of electromagnetic field response, two independent model constraint items of conductivity and magnetic conductivity are introduced, and a two-parameter inversion objective function is constructed; and constructing an inversion regular equation based on the two-parameter inversion target function, continuously iteratively solving the inversion regular equation, and updating the inversion model until a preset inversion target is reached, thereby obtaining the conductivity and magnetic conductivity of the mineral deposit containing the magnetic minerals. According to the two-parameter inversion, through comprehensive utilization of electrical and magnetic parameters, the inversion multiplicity is remarkably reduced, and the distinguishing capability of the magnetic mineral-rich ore deposit geologic structure and the reliability of an interpretation result are improved.

The application relates to a method, device and system for detecting demagnetization of a permanent magnet material, wherein the method comprises: obtaining a force change signal of the target permanent magnet material from a device for detecting demagnetization of the permanent magnet material; and determining a demagnetization state of the target permanent magnet material according to the force change signal. Compared with a method for detecting demagnetization of a permanent magnet material by using a Hall probe to detect the magnetic field strength on the surface of the permanent magnet material, the method in the embodiment is not affected by manual operation. Compared with a method for evaluating the health state of a permanent magnet material by using a camera to capture cracks, depressions and the like on the surface of the material, since the relationship between the force change signal and the demagnetization degree is relatively clear, different demagnetization degrees correspond to different force change signals, and therefore the method has higher detection accuracy and can determine the specific demagnetization degree. In summary, the method for detecting demagnetization of a permanent magnet material in the embodiment solves the problem that the detection accuracy of the current method for detecting demagnetization of a permanent magnet material is low.

The invention relates to a sensor device (3) for determining and / or monitoring a process variable of a medium (5) in a container (4), comprising - a crystal (6) having at least one defect (7), - a magnetic field system (8) for generating a magnetic field, wherein the magnetic field system (8) is arranged such that a magnetic field (B) can be generated in the region of the crystal (6) and in the region of the medium (5) located within the container (4) by means of the magnetic field system (8), and wherein the crystal (6) and the magnetic field system (8) can be arranged externally on a wall of the container (4), - a detection unit (9) for detecting a magnetic-field-dependent fluorescence signal (2) from the crystal (6), wherein the detection unit (9) has an excitation unit (10) for optically exciting the defect (7) and a detector (11) for detecting the fluorescence signal (2), and - an evaluation unit (12) for determining at least one piece of information about the process variable on the basis of the fluorescence signal (2). Furthermore, the invention relates to a method for operating the sensor device (3) of the invention.

A method includes receiving, from a plurality of magnetic field receivers including magnetic sensors, data characterizing samples obtained by the plurality of magnetic field receivers, the samples of a combination of a first magnetic field and a second magnetic field resulting from interaction of the first magnetic field and an object; determining, using the received data, a polarizability index of the object, the polarizability index characterizing a magnetic polarizability property of the object; classifying, using the determined polarizability index, the object as threat or non-threat; and providing the classification. Related apparatus, systems, techniques, and articles are also described.