Electrode polarization induction measurement method, system and device applied to magnetoelectric materials

Abstract

This application relates to the field of electromagnetic measurement technology, and specifically relates to a method, system and device for measuring electrode polarization induction applied to magnetoelectric materials. The method includes: constructing a dynamic magnetic field with a linearly increasing magnetic field strength within a preset range, and during the process of the linear increase, measuring in real time the induced current of the magnetoelectric material in the dynamic magnetic field, the magnetic field strength and temperature at the central position on the surface of the magnetoelectric material, and the temperature at each preset azimuth angle position of the magnetoelectric material; determining the current degradation degree of the magnetoelectric material; obtaining the magnetoelectric nonlinear coefficient of the magnetoelectric material; determining the polarization temperature interference degree of the magnetoelectric material; and comprehensively combining the magnetoelectric nonlinear coefficient and the polarization temperature interference degree to obtain the temperature compensation coefficient of the magnetoelectric material, and correcting the magnetoelectric coupling coefficient of the magnetoelectric material. This application improves the accuracy of measuring electrode polarization induction of magnetoelectric materials.

Description

Technical Field

[0001] This application relates to the technical field of electromagnetic measurement, and particularly to a method, system and device for measuring electric polarization induction applied to magnetoelectric materials. Background Art

[0002] Magnetoelectric materials are a new type of multifunctional materials, which have the characteristics of magnetic order and electric polarization order at the same time. Among them, magnetic order means that the atomic magnetic moments inside the material can show a regular arrangement under certain conditions, while electric polarization order means that the charge distribution inside the material is asymmetric, generating an electric dipole moment. Generally, they can be divided into single-phase magnetoelectric materials and composite magnetoelectric materials according to the material type, and have great application prospects in the fields of sensors, information storage and energy conversion.

[0003] When measuring the magnetoelectric coupling coefficient of magnetoelectric materials by traditional methods, since the magnetoelectric material is in a dynamic magnetic field, the magnetic flux passing through the magnetoelectric material will change, causing eddy currents to form inside the magnetoelectric material. Joule heat will be generated due to the resistance inside the magnetoelectric material, resulting in an increase in the temperature of the magnetoelectric material, causing eddy current effects and magnetothermal effects, and resulting in a large deviation in the calculation of the magnetoelectric coupling coefficient due to temperature drift. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of this application is to provide a method, system and device for measuring electric polarization induction applied to magnetoelectric materials. The specific technical solutions adopted are as follows:

[0005] In the first aspect, an embodiment of this application provides a method for measuring electric polarization induction applied to magnetoelectric materials. The method includes the following steps:

[0006] Construct a dynamic magnetic field with a linearly increasing magnetic field strength within a preset range. During the process of the linear increase, measure in real time the induced current of the magnetoelectric material in the dynamic magnetic field, the magnetic field strength and temperature at the central position on the surface of the magnetoelectric material, and the temperatures at each preset azimuth angle position of the magnetoelectric material;

[0007] Based on the cumulative amount and change trend of the difference between the magnetic field strength of the dynamic magnetic field and the magnetic field strength at the central position at all times, determine the magnetic deviation degree of the magnetoelectric material; analyze the fluctuation degree of the induced current at all times to determine the current degradation degree of the magnetoelectric material;

[0008] Combine the magnetic deviation degree and the current degradation degree to obtain the magnetoelectric nonlinear coefficient of the magnetoelectric material; determine the polarization temperature interference degree of the magnetoelectric material through the similarity of the temperatures at all times between any two azimuth angle positions and the difference in temperatures at all times between the central position and all azimuth angle positions;

[0009] Based on the comprehensive magnetoelectric nonlinear coefficient and the polarization temperature interference degree, the temperature compensation coefficient of the magnetoelectric material is obtained, and the magnetoelectric coupling coefficient of the magnetoelectric material is corrected.

[0010] In one embodiment, the determination of the magnetic deviation degree includes:

[0011] Obtain the linear curve of the magnetic field intensity of the dynamic magnetic field varying with time and the fitting curve of the magnetic field intensity at the central position varying with time, calculate the difference in the integral area between the linear curve and the fitting curve, and denote it as the first difference;

[0012] Calculate the difference between the magnetic field intensity of the dynamic magnetic field and the magnetic field intensity at the central position at each moment, denote it as the second difference, form a deviation sequence with the second differences at all moments, and calculate the trend term intensity of the deviation sequence;

[0013] The magnetic deviation degree is the product of the first difference and the trend term intensity.

[0014] In one embodiment, the determination of the current degradation degree includes:

[0015] Calculate the difference between the induced current at the initial moment and the end moment during the linearly increasing process, denote it as the third difference, calculate the discreteness of the induced current at all moments, and the current degradation degree is the product of the third difference and the discreteness.

[0016] In one embodiment, the magnetoelectric nonlinear coefficient is the sum of the magnetic deviation degree and the current degradation degree.

[0017] In one embodiment, the determination of the polarization temperature interference degree includes:

[0018] Form a temperature sequence with the temperatures at all moments at each position, calculate the mean value of the similarity of the temperature sequences at all arbitrary two azimuth positions; obtain the fused temperature sequence of the temperature sequences at all azimuth positions, and calculate the metric distance between the temperature sequence at the central position and the fused temperature sequence;

[0019] The polarization temperature interference degree is the product of the mean value and the metric distance.

[0020] In one embodiment, each element in the fused temperature sequence is the mean value of the temperatures at all azimuth positions at each moment.

[0021] In one embodiment, the calculation method of the temperature compensation coefficient is:

[0022] ; where, α is the temperature compensation coefficient of the magnetoelectric material, C is the magnetoelectric nonlinear coefficient of the magnetoelectric material, F is the polarization temperature interference degree of the magnetoelectric material, and norm is the normalization function. is the preset scaling weight.

[0023] In one embodiment, the correction of the magnetoelectric coupling coefficient of the magnetoelectric material is calculated as follows:

[0024] ; In the formula, is the magnetoelectric coupling coefficient of the magnetoelectric material after correction, is the initial magnetoelectric coupling coefficient calculated for the magnetoelectric material, is the temperature compensation coefficient of the magnetoelectric material, represents the logarithmic function with base 2.

[0025] In a second aspect, an electrode polarization induction measurement device applied to a magnetoelectric material provided by an embodiment of the present application stores a computer program, and when the computer program is executed by a processor, the measurement method described in any one of the above is implemented.

[0026] In a third aspect, an electrode polarization induction measurement system applied to a magnetoelectric material provided by an embodiment of the present application includes a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, the steps of the method described in any one of the above are implemented.

[0027] The present application has at least the following beneficial effects:

[0028] In this application, a dynamic magnetic field with a linearly increasing magnetic field strength within a preset range is constructed. During the process of this linear increase, the induced current, the magnetic field strength and temperature at the central position on the surface of the magnetoelectric material, and the temperatures at each preset azimuth angle position of the magnetoelectric material are measured in real time; based on the cumulative amount and the change trend of the difference between the magnetic field strength of the dynamic magnetic field at all times and the magnetic field strength at the central position, the magnetic deviation degree of the magnetoelectric material is determined; the magnetic deviation degree reflects the deviation degree between the magnetic field strength of the constructed dynamic magnetic field and the magnetic field strength measured on the surface of the magnetoelectric material, and reflects the interference degree of the magnetoelectric material affected by temperature to generate eddy current effect and magnetothermal effect, improving the accuracy of determining the interference of the electrode polarization induction measurement of the magnetoelectric material; the fluctuation degree of the induced current at all times is analyzed to determine the current degradation degree of the magnetoelectric material; the current degradation degree reflects the change amplitude of the induced current of the magnetoelectric material affected by temperature drift. Combining the magnetic deviation degree and the current degradation degree, the magnetoelectric nonlinear coefficient of the magnetoelectric material is obtained; the magnetoelectric nonlinear coefficient reflects the influence degree of temperature drift on the magnetic field strength and the induced current, improving the effectiveness of subsequent correction of the magnetoelectric coupling coefficient of the magnetoelectric material; through the similarity of the temperatures at all times at any two azimuth angle positions and the difference of the temperatures at all times between the central position and all azimuth angle positions, the polarization temperature interference degree of the magnetoelectric material is determined; the polarization temperature interference degree reflects the influence of temperature drift from the perspective of the temperature diffusion at the central position of the magnetoelectric material. Combining the magnetoelectric nonlinear coefficient and the polarization temperature interference degree, the temperature compensation coefficient of the magnetoelectric material is obtained to correct the magnetoelectric coupling coefficient of the magnetoelectric material. In the calculation of the traditional magnetoelectric coupling coefficient, it is easily affected by the vortex effect and the magnetothermal effect, resulting in temperature drift of the magnetoelectric material and a large deviation of the magnetoelectric coupling coefficient; analyzing from the influence degree of temperature drift on the nonlinearity of the magnetic field and the induced current, and combining the characteristics of the surface temperature radiation distribution of the magnetoelectric material under the eddy current effect, the temperature compensation coefficient is obtained to correct the magnetoelectric coupling coefficient of the magnetoelectric material, improving the accuracy of the electrode polarization induction measurement of the magnetoelectric material. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present application or the prior art, the drawings required for use in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 It is a flowchart of the steps of a method for electrode polarization induction measurement applied to a magnetoelectric material provided by an embodiment of the present application;

[0031] Figure 2It is a flowchart for correcting the magnetoelectric coupling coefficient. Detailed implementation manners

[0032] In order to further elaborate on the technical means and effects adopted by this application to achieve the intended invention purpose, the following will, in conjunction with the accompanying drawings and preferred embodiments, elaborate in detail on the specific implementation manners, structures, features, and effects of the polarization induction measurement method, system, and device applied to magnetoelectric materials according to this application. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs.

[0034] The following will specifically describe the specific solutions of the polarization induction measurement method, system, and device applied to magnetoelectric materials provided by this application in conjunction with the accompanying drawings.

[0035] Please refer to Figure 1 , which shows a flowchart of the steps of a polarization induction measurement method applied to magnetoelectric materials provided by an embodiment of this application. The method includes the following steps:

[0036] S1. Construct a dynamic magnetic field with a linearly increasing magnetic field strength within a preset interval. During the process of the linear increase, measure in real time the induced current of the magnetoelectric material in the dynamic magnetic field, the magnetic field strength and temperature at the central position on the surface of the magnetoelectric material, and the temperatures at the preset azimuth positions of the magnetoelectric material.

[0037] In this embodiment, for the magnetoelectric material to be measured, first use a pulsed magnetic field generator to generate a dynamic magnetic field with a linearly changing magnetic field strength. In this embodiment, the interval of the linearly changing magnetic field strength is [0, 500] amperes per meter. Among them, the magnetic field strength of the dynamic magnetic field increases linearly, and the specific increase speed is 20 A / m·min. The implementer can set it by himself according to the actual situation, and this embodiment does not limit this.

[0038] In the dynamic magnetic field, during the time period when the magnetic field strength increases from 0 to 500 amperes per meter according to the increase speed, measure in real time the induced current of the magnetoelectric material in the dynamic magnetic field, the magnetic field strength and temperature at the central position on the surface of the magnetoelectric material, and the temperatures at the four azimuth positions of the east, west, south, and north at the outermost edge of the magnetoelectric material, that is, the positions of the four azimuths are on the surface of the magnetoelectric material.

[0039] It should be noted that there are many existing magnetic field generating devices, and the implementer can choose other feasible magnetic field generating devices at his / her own. In this embodiment, the induced current is measured by a high-precision ammeter, the magnetic field strength is measured by a Gauss meter, and the temperature is measured by a temperature sensor. In this embodiment, the acquisition frequency of all types of data is 5 Hz, and the implementer can set it according to actual conditions. This embodiment does not impose any restrictions here.

[0040] S2, determining the magnetic deviation degree of the magnetoelectric material based on the cumulative difference between the magnetic field strength of the dynamic magnetic field at all times and the magnetic field strength at the center position, as well as the change trend; analyzing the fluctuation degree of the induced current at all times to determine the current degradation degree of the magnetoelectric material.

[0041] In the measurement process of the magnetoelectric coupling coefficient of traditional magnetoelectric materials, a linear fit is directly performed on the induced current and the magnetic field intensity, and the magnetoelectric coupling coefficient is directly calculated using a formula based on the area information of the magnetoelectric material. The calculation of the magnetoelectric coupling coefficient is a well-known technique. However, in the actual measurement process, it is susceptible to eddy current effects and magnetocaloric effects, which cause the temperature of the magnetoelectric material to gradually increase. At this time, the lattice thermal vibration inside the magnetoelectric material will be aggravated, and the atomic spacing will increase, thereby affecting the chemical bond strength and crystal field environment inside the magnetoelectric material. Therefore, in the environment of a dynamic magnetic field, the actual magnetic field changes and induced currents show a nonlinear distribution, which will lead to a large deviation in the calculation of the magnetoelectric coupling coefficient. Therefore, it is necessary to analyze it in combination with the collected data.

[0042] The magnetic field generator increases the magnetic field strength linearly, but the magnetoelectric material itself has a certain magnetic field, which may offset the additional magnetic field. The additional magnetic field is the magnetic field generated by the magnetic field generator, and the magnetic field strength passing through the magnetoelectric material deviates from the additional magnetic field. When the temperature rises, the electric dipole of the magnetoelectric material is aggravated, resulting in a decrease in the polarization strength of the magnetoelectric material and depolarization. Therefore, the difference between the additional magnetic field and the magnetic field strength at the surface of the magnetoelectric material tends to gradually increase during the entire electric polarization measurement process.

[0043] Based on the above analysis, the magnetic deviation degree of the magnetoelectric material is calculated as follows: The least squares method is used to obtain the linear curve of the magnetic field strength of the dynamic magnetic field changing with time, and the fitting curve of the magnetic field strength at the central position of the magnetoelectric material changing with time. Calculus is used to calculate the start time to the end time of the time period, and the difference between the integral area of the linear curve and the integral area of the fitting curve is denoted as the first difference; Calculate the difference between the magnetic field strength of the dynamic magnetic field and the magnetic field strength at the central position at each moment, denoted as the second difference. The second differences at all moments are arranged in chronological order to form a deviation sequence. The STL (Seasonal and Trend decomposition using Loess) sequence decomposition algorithm is used to calculate the trend term strength of the deviation sequence. The magnetic deviation degree is the product of the first difference and the trend term strength.

[0044] It should be noted that the least squares method, calculus calculation, and STL sequence decomposition are all well-known existing technologies, and the specific processes will not be elaborated here; The difference represents the degree of difference between two variables, and can be specifically calculated by methods such as the absolute value of the difference, the square of the difference, and the ratio. In this embodiment, the absolute value of the difference is used as the calculation method for the difference.

[0045] The calculation method of the magnetic deviation degree of the magnetoelectric material in this embodiment is as follows:

[0046] ; In the formula, A represents the magnetic deviation degree of the magnetoelectric material, represents the absolute value of the difference between the integral area of the linear curve and the integral area of the fitting curve, that is, the first difference, represents the trend term strength of the deviation sequence.

[0047] If the magnetoelectric material is more greatly affected by temperature, at this time, the deviation between the additional magnetic field and the magnetic field sensed by the magnetoelectric material is greater, so the value of the first difference obtained is greater. And as time increases, the temperature of the magnetoelectric material gradually rises, so the second difference in the deviation sequence between the additional magnetic field and the magnetic field sensed by the magnetoelectric material gradually increases, and the value of the trend term strength gradually increases, and finally the value of the magnetic deviation degree is greater.

[0048] Since the additional magnetic field increases linearly, according to Faraday's law of electromagnetic induction, ideally, the magnitude of the induced current remains basically unchanged. However, affected by temperature drift, a depolarization effect occurs, which can weaken the interaction between internal electrode polarization and magnetization of the magnetoelectric material. Therefore, as time increases and temperature rises, the induced current signal of the magnetoelectric material gradually decays, and the self-magnetic field of the magnetoelectric material may fluctuate due to the influence of internal depolarization, so the fluctuation of the induced current increases.

[0049] Thereby, the current degradation degree of the magnetoelectric material is determined, including: calculating the difference between the induced currents at the initial moment and the end moment of the time period, denoted as the third difference, calculating the dispersion degree of the induced currents at all moments, and the current degradation degree is the product of the third difference and the dispersion degree.

[0050] In this embodiment, the calculation method of the current degradation degree is as follows:

[0051] ; where represents the current degradation degree of the magnetoelectric material, represents the absolute value of the difference between the induced currents at the initial moment and the end moment of the time period, that is, the third difference, is the dispersion degree of the induced currents at all moments. The dispersion degree can be calculated by means of variance, standard deviation, coefficient of variation, etc. In this embodiment, variance is used as the calculation method of the dispersion degree.

[0052] If the current induced current is greatly affected by temperature drift, the induced current value of the magnetoelectric material will gradually decay. Therefore, the difference between the induced currents at the initial moment and the end moment is large. At the same time, due to the influence of internal depolarization, the magnetic flux passing through the magnetoelectric material as a whole fluctuates, so the induced current fluctuates to a certain extent, making the dispersion degree large, and finally the current degradation degree of the magnetoelectric material is larger.

[0053] S3. Combining the magnetic deviation degree and the current degradation degree, the magnetoelectric nonlinear coefficient of the magnetoelectric material is obtained; through the similarity of the temperatures at all moments at any two azimuth positions and the difference between the temperature at the central position and the temperatures at all azimuth positions at all moments, the polarization temperature interference degree of the magnetoelectric material is determined.

[0054] By analyzing the distribution of the magnetic field strength and the induced current of the magnetoelectric material, the corresponding magnetic deviation degree and current degradation degree are obtained. Therefore, for comprehensive consideration, the sum value of the magnetic deviation degree and the current degradation degree of the magnetoelectric material is used as the magnetoelectric nonlinear coefficient of the magnetoelectric material.

[0055] If the magnetoelectric material is less affected by temperature drift during the electrode polarization induction measurement, at this time, the magnetic field strength sensed by the magnetoelectric material is basically the linearly increasing magnetic field strength applied. Therefore, the magnetic field strength is basically linearly increasing, and the induced current obtained remains basically unchanged. Therefore, the values of the magnetic deviation degree and the current degradation degree are small, and finally the value of the magnetoelectric nonlinear coefficient of the magnetoelectric material is small.

[0056] Through the above analysis, it mainly focuses on the data distribution of the magnetic field sensed by the magnetoelectric material and the induced current when it is affected by temperature drift, and obtains the influence degree of the temperature drift on the magnetoelectric material during the measurement of electrode polarization induction. The eddy current effect and the magnetothermal effect are the main causes of temperature drift. In order to avoid the measurement error of the magnetic field intensity and the induced current caused by thermal noise, it is necessary to further analyze in combination with the temperature distribution during the acquisition process.

[0057] When the magnetoelectric material is in a dynamic magnetic field, and the magnetoelectric material itself is often conductive, so when the magnetic field changes, the magnetic flux in the closed loop inside the magnetoelectric material will change, causing the induced current to form a closed loop inside the material, showing a vortex shape, thus generating the eddy current effect.

[0058] The eddy current effect will cause the magnetoelectric material to generate induced heating. The influence of the eddy current will make the temperature rise faster closer to the center position of the magnetoelectric material, while the temperature rise is relatively slower closer to the edge position of the magnetoelectric material. Therefore, with the measurement of electrode polarization induction, the temperature difference between the center position and the edge position of the magnetoelectric material becomes larger.

[0059] Based on the above analysis, the temperatures at all times collected at each position are composed into a temperature sequence at each position according to the time sequence. The average value of the temperatures at all azimuth positions at each moment is calculated, and the average values at all times are composed into a fused temperature sequence according to the time sequence. The polarization temperature interference degree of the magnetoelectric material is calculated. The specific calculation method is as follows:

[0060] ; where F represents the polarization temperature interference degree of the magnetoelectric material, and the similarity of the temperature sequences at any two azimuth positions is calculated. is the mean value of all the similarities. represents the temperature sequence at the center position of the magnetoelectric material. represents the fused temperature sequence, and DTW() represents the DTW (Dynamic Time Warping) distance for calculating the sequence.

[0061] It should be noted that in this embodiment, the calculation method of the similarity is the Pearson correlation coefficient. In other embodiments, the cosine similarity can be used as the measurement method of the similarity. In this embodiment, the DTW distance is used to calculate the measurement distance between sequences, and the implementer can choose other measurement distance methods by himself.

[0062] When the eddy current effect acts on the magnetoelectric material, the surface temperature distribution of the magnetoelectric material shows a state of radiation from the center to the outside. Therefore, when the magnetoelectric material is more severely affected by the eddy current effect, the temperature at the edge of the magnetoelectric material is basically more consistent, and the similarity between the temperature sequences is relatively high. However, the temperature sequences at the center and the edge positions are quite different, resulting in a relatively large DTW distance value, and ultimately a larger polarization temperature interference degree value of the magnetoelectric material.

[0063] S4. Based on the above-mentioned magnetoelectric nonlinear coefficient and the polarization temperature interference degree, obtain the temperature compensation coefficient of the magnetoelectric material, and correct the magnetoelectric coupling coefficient of the magnetoelectric material.

[0064] In order to calculate the magnetoelectric coupling coefficient of the magnetoelectric material more accurately and reduce the influence of the calculation result on temperature drift, in this embodiment, the temperature compensation coefficient of the magnetoelectric material is calculated. The specific calculation method is as follows:

[0065] ; where is the temperature compensation coefficient of the magnetoelectric material, C is the magnetoelectric nonlinear coefficient of the magnetoelectric material, F is the polarization temperature interference degree of the magnetoelectric material, norm is the normalization function, is the preset scaling weight, and its value range is [1, 5]. In this embodiment, the value is 3.

[0066] If the magnetoelectric material is more severely affected by temperature drift, the nonlinearity of the magnetic field strength and the induced current during the electrode polarization induction measurement will increase, resulting in a relatively large value of the magnetoelectric nonlinear coefficient. At the same time, it will also lead to a greater difference in the radiation distribution of the temperature on the magnetoelectric material, that is, a greater difference between the temperature sequences at the center position and the edge position. Ultimately, a relatively large value of the temperature compensation coefficient is obtained, which improves the adjustment strength of the magnetoelectric coupling coefficient. On the contrary, if the magnetoelectric material is less affected by temperature drift, a relatively small value of the temperature compensation coefficient is obtained at this time, reducing the intervention degree of the magnetoelectric coupling coefficient.

[0067] To reduce the error in the measurement of the magnetoelectric coupling coefficient caused by the temperature offset due to the eddy current effect and the magnetothermal effect, in this embodiment, the magnetoelectric coupling coefficient of the magnetoelectric material obtained by traditional measurement is corrected. Specifically:

[0068] According to the basic principle of magnetoelectric coupling, the magnetoelectric coupling coefficient The calculation formula is: ; where I represents the induced current, H represents the magnetic field strength, represents the dielectric constant of the magnetoelectric material, and S represents the cross-section of the magnetoelectric material penetrated by the dynamic magnetic field, that is, the area of the upper surface of the magnetoelectric material. Among them, the calculation of the magnetoelectric coupling coefficient is a well-known existing technology, and this embodiment will not elaborate on it in detail here.

[0069] Due to the influence of temperature drift, the measured value of the magnetoelectric coupling coefficient will be on the low side. Therefore, correction is performed based on the temperature compensation coefficient, specifically as follows:

[0070] ; where, is the magnetoelectric coupling coefficient of the magnetoelectric material after correction, is the initial magnetoelectric coupling coefficient calculated for the magnetoelectric material, is the temperature compensation coefficient of the magnetoelectric material, represents the logarithmic function with base 2. The flowchart for correcting the magnetoelectric coupling coefficient is as shown in Figure 2 shown.

[0071] If the magnetoelectric material is greatly affected by temperature drift during the measurement of electrode polarization induction, the obtained value of the temperature compensation coefficient is large, thereby achieving amplification of the value of the traditional magnetoelectric coupling coefficient. On the contrary, when the influence of temperature drift is small, the obtained value of the magnetoelectric coupling coefficient is small. Therefore, the closer the value of is to 1, the smaller the correction strength for the initial magnetoelectric coupling coefficient.

[0072] The embodiment of the present application also provides an electrode polarization induction measurement device for magnetoelectric materials. A computer program is stored in the measurement device, and when the computer program is executed by a processor, the measurement method described in any one of the above electrode polarization induction measurement methods for magnetoelectric materials is implemented.

[0073] Based on the same inventive concept as the above method, the embodiment of the present application also provides an electrode polarization induction measurement system for magnetoelectric materials, including a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, the steps of the method described in any one of the above electrode polarization induction measurement methods for magnetoelectric materials are implemented.

[0074] It should be noted that: the above sequence of embodiments of the present application is only for description and does not represent the superiority or inferiority of the embodiments. And the above specific embodiments of this specification have been described. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0075] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments.

[0076] The foregoing are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the principles of the present application shall be included within the protection scope of the present application.

Claims

1. A method for measuring electrode polarization induction applied to magnetoelectric materials, characterized in that, The method comprises the following steps: Constructing a dynamic magnetic field in which the magnetic field strength increases linearly within a preset interval, and during the linear increase process, measuring in real time the induced current of the magnetoelectric material in the dynamic magnetic field, the magnetic field strength and temperature at the center position of the magnetoelectric material surface, and the temperature at each preset azimuth position of the magnetoelectric material; Determining the magnetic deviation of the magnetoelectric material based on the cumulative difference between the magnetic field strength of the dynamic magnetic field at all times and the magnetic field strength at the center position, as well as the change trend; and determining the current degradation of the magnetoelectric material by analyzing the fluctuation degree of the induced current at all times. Combining the magnetic deviation degree and the current degradation degree, the magnetoelectric nonlinear coefficient of the magnetoelectric material is obtained; and the polarization temperature interference degree of the magnetoelectric material is determined by the similarity of the temperatures at all times between any two azimuth positions and the difference of the temperatures at all times between the center position and all azimuth positions; The magnetoelectric nonlinear coefficient and the polarization temperature interference are combined to obtain a temperature compensation coefficient of the magnetoelectric material, and the magnetoelectric coupling coefficient of the magnetoelectric material is corrected; The temperature compensation coefficient is calculated as follows: ; wherein, is the temperature compensation coefficient of the magnetoelectric material, C is the magnetoelectric nonlinear coefficient of the magnetoelectric material, F is the polarization temperature interference degree of the magnetoelectric material, norm is the normalization function, is the preset scaling weight; The magnetoelectric coupling coefficient of the magnetoelectric material is corrected and calculated as follows: ; where, is the magnetoelectric coupling coefficient after calibration of the magnetoelectric material, is the initial magnetoelectric coupling coefficient calculated for the magnetoelectric material, is the temperature compensation coefficient of the magnetoelectric material, represents the logarithmic function with base 2.

2. The electrode polarization induction measurement method applied to magnetoelectric materials according to claim 1, wherein The determination of the magnetic deviation degree includes: Obtaining a linear curve of the magnetic field intensity of the dynamic magnetic field varying with time, and a fitting curve of the magnetic field intensity at the center position varying with time, and calculating a difference in integral area between the linear curve and the fitting curve, which is recorded as a first difference; Calculating the difference between the magnetic field intensity of the dynamic magnetic field at each moment and the magnetic field intensity at the center position, recording it as a second difference, forming a deviation sequence with the second differences at all moments, and calculating the trend item intensity of the deviation sequence; The degree of magnetic deviation is the product of the first difference and the strength of the trend term.

3. The electrode polarization induction measurement method applied to magnetoelectric materials according to claim 1, characterized in that Determining the current degradation degree includes: During the linear increase process, a difference between the induced current at the initial moment and the end moment is calculated as a third difference. The discrete degree of the induced current at all moments is calculated. The current degradation degree is the product of the third difference and the discrete degree.

4. The electrode polarization induction measurement method applied to magnetoelectric materials according to claim 1, characterized in that, The magnetoelectric nonlinear coefficient is the sum of the magnetic deviation degree and the current degradation degree.

5. The electrode polarization induction measurement method applied to magnetoelectric materials according to claim 1, characterized in that, The determination of the polarization temperature interference degree includes: The temperatures at all moments at each position are combined into a temperature sequence, and the mean of the similarities of the temperature sequences at any two azimuth positions is calculated; a fused temperature sequence of the temperature sequences at all azimuth positions is obtained, and a metric distance between the temperature sequence at the center position and the fused temperature sequence is calculated; The polarization temperature interference is the product of the mean value and the metric distance.

6. The electrode polarization induction measurement method applied to magnetoelectric materials according to claim 5, characterized in that, Each element in the fusion temperature sequence is the average value of the temperature at all azimuth positions at each moment.

7. An electrode polarization induction measurement device applied to magnetoelectric materials, wherein a computer program is stored in the measurement device, characterized in that When the computer program is executed by a processor, the measurement method according to any one of claims 1 to 6 is implemented.

8. An electrode polarization induction measurement system applied to magnetoelectric materials, characterized in that, The method comprises a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor implements the steps of the method according to any one of claims 1 to 6 when executing the computer program.

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