Magnetic moment parameter measurement method and system, storage medium and electronic equipment

Abstract

The invention discloses a magnetic moment parameter measurement method and system, a storage medium and electronic equipment. The method comprises the steps that the resonance frequency and the resonance amplitude of a sample rod provided with a to-be-measured magnetic sample in a target gradient field are measured, and the target gradient field is generated by a magnetic field system; acquiring the mass of the to-be-measured magnetic sample, and determining the magnetic force borne by the to-be-measured magnetic sample in the target gradient field according to the mass, the resonance frequency and the resonance amplitude; and determining the magnetic moment parameter of the to-be-measured magnetic sample according to the magnetic force borne by the to-be-measured magnetic sample and the current parameter of the gradient coil in the magnetic field system. According to the invention, the problems of high equipment cost and low measurement accuracy during magnetic measurement of the to-be-measured magnetic sample in the prior art are solved.

Description

Technical Field

[0001] The present application relates to the field of magnetic measurement technology, and in particular to a method, system, storage medium and electronic device for measuring magnetic moment parameters. Background Art

[0002] In the related art, the magnetic properties of the magnetic sample to be tested can be measured by AGFM (Alternating Gradient Field Magnetometer). AGFM uses the periodic force exerted on the magnetic object in the alternating gradient field to make the sample rod vibrate periodically. The sample rod is connected to a piezoelectric chip. The vibration of the sample rod causes the force on the piezoelectric chip to change, and the piezoelectric chip generates an electrical signal. According to the conversion process of "displacement-pressure-piezoelectric-magnetic signal", the magnetic properties of the magnetic sample to be tested are obtained.

[0003] It should be noted that the magnetic measurement method in the related art has high sensitivity in high-frequency scenarios, but there are some defects. On the one hand, in the conversion process of "displacement-pressure-piezoelectric-magnetic signal", due to the large number of sensors and modes involved in the measurement and conversion of pressure and piezoelectric signals, the equipment is complex, the cost is high, and the measurement error is large. On the other hand, in order to make the vibration of the sample rod obtained by the piezoelectric chip closer to the vibration of the sample on the sample rod, the sample rod needs to have specific characteristics, resulting in complex design and high cost of the sample rod. In addition, in complex environments, the sample rod will have performance changes in length and elasticity, and the electrical signal of the piezoelectric chip is difficult to accurately reflect the vibration of the sample, resulting in reduced measurement accuracy.

[0004] Currently, no effective solution has been proposed to address the problems of high equipment cost and low measurement accuracy when performing magnetic measurements on magnetic samples to be measured in related technologies. Summary of the invention

[0005] The present application provides a method, system, storage medium and electronic device for measuring magnetic moment parameters to solve the problems of high equipment cost and low measurement accuracy when performing magnetic measurement on a magnetic sample to be measured in the related art.

[0006] According to one aspect of the present application, a method for measuring magnetic moment parameters is provided. The method comprises: measuring the resonance frequency and resonance amplitude of a sample rod on which a magnetic sample to be measured is mounted under a target gradient field, wherein the target gradient field is generated by a magnetic field system; obtaining the mass of the magnetic sample to be measured, and determining the magnetic force exerted on the magnetic sample to be measured in the target gradient field according to the mass, the resonance frequency and the resonance amplitude; and determining the magnetic moment parameters of the magnetic sample to be measured according to the magnetic force exerted on the magnetic sample to be measured and the current parameters of the gradient coil in the magnetic field system.

[0007] Optionally, measuring the resonance frequency and resonance amplitude of a sample rod on which the magnetic sample to be tested is installed under a target gradient field includes: controlling the gradient coil to be in an energized state, wherein the magnetic field system generates a gradient field when the gradient coil is in the energized state, and the gradient field causes the magnetic sample to be tested to drive the sample rod to vibrate; adjusting the current passed into the gradient coil, and measuring the vibration amplitude of the sample rod at different vibration frequencies until the resonance frequency and resonance amplitude of the sample rod are obtained.

[0008] Optionally, obtaining the mass of the magnetic sample to be tested includes: sequentially installing each of N standard magnetic samples on a sample rod, controlling the gradient coil to be energized, and measuring the resonance frequency of the sample rod driven by each standard magnetic sample to obtain N resonance frequencies; obtaining the mass of the N standard magnetic samples, and determining a target mapping relationship based on the mass of the N standard magnetic samples and the N resonance frequencies, wherein the target mapping relationship characterizes the relationship between the resonance frequency of the sample rod and the mass of the magnetic sample that drives the sample rod to vibrate; and determining the mass of the magnetic sample to be tested based on the target mapping relationship and the resonance frequency of the sample rod under the target gradient field.

[0009] Optionally, determining the magnetic force exerted on the magnetic sample to be tested in the target gradient field according to the mass, the resonance frequency and the resonance amplitude includes: determining a correlation coefficient according to the mass and the resonance frequency, wherein the correlation coefficient characterizes the correlation relationship between the resonance amplitude and the magnetic force exerted on the magnetic sample to be tested; and calculating the product of the correlation coefficient and the resonance amplitude to obtain the magnetic force exerted on the magnetic sample to be tested.

[0010] Optionally, determining the magnetic moment parameters of the magnetic sample to be tested based on the magnetic force exerted on the magnetic sample to be tested and the current parameters of the gradient coil in the magnetic field system includes: determining the gradient magnetic field multiplier based on the current parameters of the gradient coil; dividing the magnetic force exerted on the magnetic sample to be tested and the gradient magnetic field multiplier to obtain the magnetization intensity of the magnetic sample to be tested, and determining the magnetization intensity as the magnetic moment parameter of the magnetic sample to be tested.

[0011] Optionally, determining the gradient magnetic field multiplier according to the current parameters of the gradient coil includes: determining the gradient of the gradient magnetic field in a preset direction, wherein the preset direction is the axial direction of the gradient coil; and calculating the product of the gradient in the preset direction and the vacuum permeability to obtain the gradient magnetic field multiplier.

[0012] Optionally, the elastic modulus of the sample rod is greater than 20 GPa.

[0013] Optionally, the material of the sample rod is at least carbon fiber.

[0014] According to another aspect of the present application, a method for measuring magnetic moment parameters is provided, which uses an alternating gradient field magnetometer for measurement, including: installing a magnetic sample to be measured on a sample rod, and using a measuring device to detect the vibration frequency and amplitude of the sample rod; changing the current passed through the gradient coil to change the amplitude and vibration frequency of the magnetic sample to be measured, and at least obtaining the resonance frequency and resonance amplitude of the magnetic sample to be measured; and determining the magnetic moment parameters of the magnetic sample to be measured based on the resonance frequency, the resonance amplitude, the mass of the magnetic sample to be measured, and the current of the gradient coil.

[0015] Optionally, the measurement method further includes: detecting the resonance frequencies corresponding to N standard magnetic samples of known mass when they are respectively installed on the sample rod, and calculating the mass of the magnetic sample to be measured according to the resonance frequencies of the standard magnetic samples and the resonance frequencies of the magnetic sample to be measured.

[0016] Optionally, the measuring device is a laser vibrometer, and the detection light of the laser vibrometer is irradiated onto the position of the sample rod where the magnetic sample to be measured is installed.

[0017] According to another aspect of the present application, a system for measuring magnetic moment parameters is provided. The system includes: a sample rod for mounting a magnetic sample; a magnetic field system, arranged within a first preset distance range of the sample rod, wherein the magnetic field system includes a magnet and a gradient coil, and a gradient field is generated when the gradient coil is powered on, and the magnetic sample is induced to drive the sample rod to vibrate through the gradient field; a measuring device, arranged within a second preset distance range of the sample rod, and used to measure the vibration frequency and vibration amplitude of the sample rod under the gradient field; a controller, connected to the magnetic field system and the measuring device, and used to control the current passed into the gradient coil, and to perform a method for measuring magnetic moment parameters based on the data measured by the measuring device.

[0018] According to another aspect of an embodiment of the present invention, a computer storage medium is provided, wherein the computer storage medium is used to store a program, wherein when the program is run, the device where the non-volatile storage medium is located is controlled to execute a method for measuring a magnetic moment parameter.

[0019] According to another aspect of an embodiment of the present invention, an electronic device is provided, comprising a processor and a memory; the memory stores computer-readable instructions, and the processor is used to execute the computer-readable instructions, wherein a method for measuring a magnetic moment parameter is executed when the computer-readable instructions are executed.

[0020] Through the present application, the following steps are adopted: measuring the resonant frequency and resonant amplitude of a sample rod equipped with a magnetic sample to be tested under a target gradient field, wherein the target gradient field is generated by a magnetic field system; obtaining the mass of the magnetic sample to be tested, and determining the magnetic force received by the magnetic sample to be tested in the target gradient field according to the mass, resonant frequency and resonant amplitude; determining the magnetic moment parameters of the magnetic sample to be tested according to the magnetic force received by the magnetic sample to be tested and the current parameters of the gradient coil in the magnetic field system, thereby solving the problems of high equipment cost and low measurement accuracy when performing magnetic measurement on the magnetic sample to be tested in the related art. The magnetic force received by the magnetic sample to be tested is determined by the mass of the magnetic sample to be tested, the resonant frequency and resonant amplitude of the sample rod, and the magnetic moment parameters of the magnetic sample to be tested are determined in combination with the magnetic force received by the magnetic sample to be tested and the current parameters of the gradient coil, and the magnetic moment parameters are directly obtained by solving the resonant amplitude, thereby achieving the effect of reducing the cost of equipment when performing magnetic measurement on the magnetic sample to be tested and improving the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0022] Figure 1 is a schematic diagram of a system for measuring magnetic moment parameters according to an embodiment of the present application;

[0023] Figure 2 is a flow chart of a method for measuring magnetic moment parameters according to an embodiment of the present application;

[0024] Figure 3 is a flow chart of another method for measuring magnetic moment parameters according to an embodiment of the present application;

[0025] Figure 4 is a schematic diagram of a device for measuring magnetic moment parameters according to an embodiment of the present application;

[0026] Figure 5 is a schematic diagram of another device for measuring magnetic moment parameters according to an embodiment of the present application;

[0027] Figure 6 is a schematic diagram of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] According to an embodiment of the present application, a system for measuring magnetic moment parameters is provided.

[0032] Figure 1 Schematic diagram of a system for measuring magnetic moment parameters according to an embodiment of the present application. Figure 1 As shown, the system includes:

[0033] The sample rod 101 is used to mount the magnetic sample 102 .

[0034] It should be noted that the sample rod 101 is fixed by a fixing device, the magnetic sample 102 is mounted on the sample rod 101, the magnetic moment parameters of the magnetic sample 102 are to be measured, the magnetic sample 102 vibrates under the gradient field, and drives the sample rod 101 to vibrate, and the magnetic moment parameters of the magnetic sample 102 are determined by the vibration signal of the sample rod 101.

[0035] Among them, the magnetic sample 102 can be a magnetic material such as a magnet or a magnetic film, and the sample rod 101 can be a sample rod 101 made of a material with a high elastic modulus. The high elastic modulus can refer to an elastic modulus greater than 20 GPa. For example, the sample rod 101 can be a carbon fiber sample rod 101 with a high elastic modulus.

[0036] When the magnetic sample 102 drives the carbon fiber sample rod 101 with a high elastic modulus to vibrate, on the one hand, the sample rod 101 with a high elastic modulus can amplify the intensity of the vibration signal, so that the measuring device 104 can accurately measure the vibration signal at the end of the sample rod 101 and control the error within the nanometer range. On the other hand, compared with sample rods 101 made of ceramic, glass, stainless steel and other materials, the carbon fiber sample rod 101 is not easy to break or deform, has a long service life and a low cost of use.

[0037] The magnetic field system 103 is arranged within a first preset distance range of the sample rod 101, wherein the magnetic field system 103 includes a magnet and a gradient coil. When the gradient coil is powered on, a gradient field is generated, and the magnetic sample 102 drives the sample rod 101 to vibrate through the gradient field.

[0038] Among them, the magnetic field system 103 may include two magnetic field generating modules, the central axes of the two magnetic field generating modules and the sample rod 101 are on the same plane, the magnetic field generating modules are all arranged within a first preset distance range of the sample rod 101, for example, the first preset distance range may be 20 mm to 500 mm, each magnetic field generating module may include a magnet and a group of gradient coils, a group of gradient coils includes multiple pairs of coils, and the multiple pairs of coils are wound on the magnet. For example, a group of gradient coils may include two pairs of coils, when powered on, one pair of coils generates a main magnetic field, and the other pair of coils generates an additional magnetic field, the main magnetic field and the additional magnetic field work together to form a gradient magnetic field, the gradient field induces the magnetic sample 102 to vibrate, and the magnetic sample 102 drives the sample rod 101 to vibrate.

[0039] It should be noted that the change of the current flowing through the gradient coil can change the gradient magnetic field, thereby changing the vibration of the magnetic sample 102 and the sample rod 101. The change of the current flowing through the gradient coil can be controlled, for example, the size, density, frequency and other parameters of the current signal passing through the gradient coil can be controlled to change, thereby changing the gradient magnetic field.

[0040] The measuring device 104 is disposed within a second preset distance range of the sample rod 101 and is used to measure the vibration frequency and vibration amplitude of the sample rod 101 under the gradient field.

[0041] Among them, the measuring device 104 can be a vibration measuring device, which is arranged within a second preset distance range of the sample rod 101. It should be noted that the distance between the vibration measuring device and the measured position is related to the detection result. The longer the distance between the vibration measuring device and the measured position, the smaller the resonance frequency. The second preset distance range can be 0-100mm. The measuring device 104 can be a laser vibrometer, and the second preset distance range can be 0. It can accurately measure the vibration signal at the end of the sample rod 101 with a high elastic modulus, the vibration frequency and vibration amplitude of the sample rod 101 under the gradient field, and control the error within the nanometer range.

[0042] Controller( Figure 1 ), connected to the magnetic field system 103 and the measuring device 104, for controlling the current passed into the gradient coil, and executing the method for measuring the magnetic moment parameters based on the data measured by the measuring device 104.

[0043] The controller can control the current passed into the gradient coil to change, so that the magnetic field system 103 generates different gradient fields, and the magnetic sample 102 and the sample rod 101 generate different vibrations under different gradient fields. The controller can also receive the vibration data of the magnetic sample 102 and the sample rod 101 under different gradient fields measured by the measuring device 104, execute the method for measuring the magnetic moment parameters of the following embodiment, and calculate the magnetic moment parameters of the magnetic sample 102 based on the vibration data of the magnetic sample 102 and the sample rod 101 under different gradient fields.

[0044] According to an embodiment of the present application, a method for measuring a magnetic moment parameter is provided.

[0045] Figure 2 FIG. 1 is a flow chart of a method for measuring magnetic moment parameters according to an embodiment of the present application. Figure 2 As shown, the method comprises the following steps:

[0046] Step S202 , measuring the resonance frequency and resonance amplitude of the sample rod on which the magnetic sample to be measured is mounted under a target gradient field, wherein the target gradient field is generated by a magnetic field system.

[0047] The magnetic moment parameters of the magnetic sample to be tested are to be measured, and the magnetic sample to be tested can be a magnetic material such as a magnet, a magnetic film, etc. The magnetic field system is arranged near the sample rod on which the magnetic sample to be tested is installed, and is used to generate a gradient field, which causes the magnetic sample to be tested to vibrate, and the magnetic sample to be tested drives the sample rod to vibrate.

[0048] Under different gradient magnetic fields, the magnetic sample to be tested drives the sample rod to vibrate in different ways. The target gradient field is a gradient field that causes the sample rod to produce a resonant frequency and a resonant amplitude. The resonant frequency of the sample rod is the frequency at which the magnetic sample to be tested is driven by the magnetic force of the gradient field to drive the sample rod to produce the maximum amplitude. When the frequency of the gradient magnetic field matches the vibration frequency of the sample rod, the gradient magnetic field is the target gradient magnetic field. The sample rod will resonate under the target gradient magnetic field. The vibration frequency and amplitude of the sample rod under the resonance phenomenon are measured to obtain the resonance frequency and the resonance amplitude.

[0049] Step S204, obtaining the mass of the magnetic sample to be tested, and determining the magnetic force exerted on the magnetic sample to be tested in the target gradient field according to the mass, the resonance frequency and the resonance amplitude.

[0050] It should be noted that the magnetic sample to be tested vibrates under the action of the magnetic force in the target gradient field, and drives the sample rod to generate a resonance amplitude. There is a correlation between the magnitude of the resonance amplitude and the magnetic force exerted on the magnetic sample to be tested. The correlation coefficient characterizing the correlation can be determined based on the resonance frequency of the sample rod and the mass of the magnetic sample to be tested. The magnitude of the magnetic force exerted on the magnetic sample to be tested can be calculated based on the correlation coefficient and the resonance amplitude.

[0051] Step S206, determining the magnetic moment parameters of the magnetic sample to be tested according to the magnetic force exerted on the magnetic sample to be tested and the current parameters of the gradient coils in the magnetic field system.

[0052] When the gradient magnetic field is clear, the magnetic moment of the magnetic sample to be tested will directly determine the vibration of the magnetic sample and the sample rod. The gradient magnetic field is determined by the current parameters of the gradient coil in the magnetic field system, and the vibration of the magnetic sample and the sample rod is related to the magnetic force exerted on the magnetic sample to be tested. Therefore, the magnetic moment parameters of the magnetic sample to be tested can be determined based on the magnetic force exerted on the magnetic sample to be tested and the current parameters of the gradient coil.

[0053] It should be noted that the signal conversion method of the measurement method of the magnetic moment parameters in the present application converts the magnetic moment signal of the magnetic sample to be measured into a displacement signal (that is, vibration amplitude) that can be measured by a high-sensitivity measuring device (for example, a laser vibrometer). On the one hand, the vibration frequency and vibration amplitude are obtained using the measuring device. The acquisition of the vibration frequency and vibration amplitude at a certain moment does not depend on the vibration frequency and vibration amplitude at the previous moment, so there is no error accumulation, which can avoid the problem of error accumulation and signal conversion difficulties in the laser vibration measurement process in the related art. On the other hand, the present application directly collects the displacement signal, and directly obtains the magnetic moment signal by solving the displacement signal, realizing the direct conversion of the "displacement-magnetic moment signal", no longer relying on the conversion process of the "displacement-pressure-piezoelectric-magnetic signal" in the related art, simplifying the intermediate steps, reducing the signal conversion requirements, and can effectively reduce the measurement error and system complexity, and improve the measurement accuracy of the sample magnetic moment.

[0054] The elastic modulus of the sample rod may also affect the measurement of the magnetic moment parameters of the magnetic sample to be measured. Optionally, in the magnetic moment parameter measurement method provided in the embodiment of the present application, the elastic modulus of the sample rod is greater than 20 GPa.

[0055] The sample rod can be a sample rod made of a material with a high elastic modulus. The high elastic modulus can refer to an elastic modulus greater than 20 GPa, for example, it can be 40 GPa. When the magnetic sample drives the sample rod with a high elastic modulus to vibrate, the sample rod with a high elastic modulus can amplify the intensity of the vibration signal, so that the measuring equipment can accurately measure the vibration signal at the end of the sample rod and control the error within the nanometer range, thereby laying a data foundation for accurately determining the magnetic moment parameters of the magnetic sample to be measured.

[0056] The material of the sample rod may also affect the magnetic moment measurement of the magnetic sample to be measured. Optionally, in the method for measuring magnetic moment parameters provided in an embodiment of the present application, the material of the sample rod is at least carbon fiber.

[0057] It should be noted that in the conversion process of "displacement-pressure-piezoelectric-magnetic signal" in the related art, on the one hand, in order to make the vibration of the sample rod obtained by the piezoelectric chip closer to the vibration of the sample on the sample rod, the sample rod needs to have specific characteristics. For example, the sample rod needs not to be greatly deformed. The sample rod can be made of ceramic material, but it is difficult to make ceramic material into a slender rod, and it is easy to break, deform and damage, and the high cost increases the cost of use. The material of the sample rod of the present application is at least carbon fiber. Compared with the sample rods in the related art (sample rods made of ceramic, glass, stainless steel, etc.), the carbon fiber sample rod is not easy to break or deform, has a long service life, and has a low cost of use.

[0058] On the other hand, in complex environments, such as variable temperature conditions, when the sample rod temperature changes, the sample rod in the related art will change in length and elasticity, causing the correspondence between the signal generated by the original piezoelectric chip and the sample vibration to change, and thus it is impossible to determine whether the signal of the piezoelectric chip can reflect the vibration condition of the sample, resulting in reduced accuracy. The carbon fiber sample rod in this application has its own characteristics that are less affected by the environment and has a higher elastic modulus. It can also accurately characterize the relationship between the magnetic force and vibration conditions of the magnetic sample to be tested in a complex environment, thereby laying a data foundation for improving the measurement accuracy of the magnetic moment parameters of the magnetic sample to be tested.

[0059] The resonance frequency and resonance amplitude of the sample rod can be measured in the process of adjusting the current passed through the gradient coil. Optionally, in the method for measuring the magnetic moment parameters provided in the embodiment of the present application, measuring the resonance frequency and resonance amplitude of the sample rod installed with the magnetic sample to be tested under the target gradient field includes: controlling the gradient coil to be in an energized state, wherein the magnetic field system generates a gradient field when the gradient coil is in an energized state, and the gradient field causes the magnetic sample to be tested to drive the sample rod to vibrate; adjusting the current passed through the gradient coil, and measuring the vibration amplitude of the sample rod at different vibration frequencies until the resonance frequency and resonance amplitude of the sample rod are obtained.

[0060] After the magnetic sample to be tested is installed on the sample rod, current is passed through the gradient coil in the magnetic field system so that the gradient coil is in a powered-on state. The gradient coil wound on the magnet includes multiple pairs of coils. When powered on, different pairs of coils generate a main magnetic field and an additional magnetic field. The main magnetic field and the additional magnetic field work together to form a gradient magnetic field. The magnetic sample is induced to vibrate through the gradient field, and the magnetic sample drives the sample rod to vibrate. The vibration frequency and the corresponding vibration amplitude of the end of the sample rod can be measured by a vibration measuring device. It should be noted that for different magnetic samples to be tested, the range accuracy of the measuring equipment is different, and the accuracy of inducing vibration is also different. Current can be passed through the gradient coil based on a preset current parameter value (for example, a preset current magnitude, a preset current frequency, a preset current density) to cause the magnetic sample to be tested and the sample rod to vibrate.

[0061] In order to measure the vibration data under different vibration conditions, the current parameters of the current signal passed into the gradient coil can be controlled to change, thereby forming different gradient fields. Different gradient fields make the magnetic sample and the sample rod to be measured vibrate at different vibration frequencies. The vibration measuring device can be used to measure the amplitude A of the end of the sample rod at different vibration frequencies w by frequency sweeping, and the {A, w} pairs are recorded. The maximum vibration amplitude and its corresponding vibration frequency are obtained from the {A, w} pairs to obtain the resonance amplitude and resonance frequency of the sample rod. In the process of frequency sweeping, several vibration frequencies can be measured first, and the approximate frequency sweeping range can be determined first according to the distribution law of the corresponding vibration amplitudes, and then the frequency sweeping range is narrowed until the resonance frequency and resonance amplitude are measured.

[0062] The mass of the magnetic sample to be tested can be determined based on the relationship between the resonant frequency of the sample rod and the mass of the magnetic sample that drives the sample rod to vibrate. Optionally, in the method for measuring the magnetic moment parameters provided in the embodiment of the present application, obtaining the mass of the magnetic sample to be tested includes: sequentially installing each of N standard magnetic samples on the sample rod, controlling the gradient coil to be in an energized state, and measuring the resonant frequency of the sample rod driven by each standard magnetic sample to obtain N resonant frequencies; obtaining the mass of the N standard magnetic samples, and determining a target mapping relationship based on the mass of the N standard magnetic samples and the N resonant frequencies, wherein the target mapping relationship characterizes the relationship between the resonant frequency of the sample rod and the mass of the magnetic sample that drives the sample rod to vibrate; and determining the mass of the magnetic sample to be tested based on the target mapping relationship and the resonant frequency of the sample rod under the target gradient field.

[0063] The standard magnetic sample is a calibrated sample, that is, a magnetic sample that has been modulated and has known magnetic moment and mass, and can be a magnetic material such as a magnet or a magnetic film. The N standard magnetic samples have different masses and are not limited in variety. In an optional implementation, N can be a number greater than 10. This embodiment does not limit the number of N. The target mapping relationship can also be determined when the number is less than 10, but there is a certain error.

[0064] For N standard magnetic samples, one standard magnetic sample is installed on the sample rod each time, and current is passed through the gradient coil in the magnetic system to generate a gradient field to cause the standard magnetic sample and the sample rod to vibrate. The vibration of the standard magnetic sample and the sample rod is adjusted by adjusting the current passed through the gradient coil, and the vibration frequency and corresponding amplitude of the sample rod are measured using a measuring device until the resonant frequency and resonant amplitude are measured. Then, different standard magnetic materials are replaced on the same sample rod multiple times and the above steps are performed until the measurement of N standard magnetic samples is completed, and the resonant frequency and resonant amplitude generated when the N standard magnetic samples drive the sample rod to vibrate are measured.

[0065] Furthermore, a target mapping relationship between the resonance frequency and the sample mass is determined according to the masses of the N standard magnetic samples and the N resonance frequencies. The target mapping relationship may be in a tabular form, a curve form, or a formula form. When the resonance frequency of the sample rod under the target gradient field is measured, the mass of the magnetic sample to be measured may be determined based on the target mapping relationship.

[0066] Through this embodiment, the N resonance frequencies of the same sample rod driven by N standard magnetic samples are measured respectively, and the target mapping relationship is determined according to the mass of the N standard magnetic samples and the N resonance frequencies. When the resonance frequency of the sample rod under the target gradient field is measured, the mass of the magnetic sample to be measured can be accurately determined based on the target mapping relationship. It should be noted that this embodiment does not limit the method for determining the mass of the magnetic sample to be measured, and other high-precision mass measurement equipment can also be used to measure the mass of the magnetic sample to be measured.

[0067] There is a correlation between the magnitude of the resonance amplitude generated by the sample rod and the magnetic force exerted on the magnetic sample to be tested. After the resonance amplitude of the sample rod is obtained, the magnetic force exerted on the magnetic sample to be tested can be determined based on the correlation. Optionally, in the method for measuring magnetic moment parameters provided in an embodiment of the present application, determining the magnetic force exerted on the magnetic sample to be tested in a target gradient field based on the mass, resonance frequency and resonance amplitude includes: determining a correlation coefficient based on the mass and the resonance frequency, wherein the correlation coefficient characterizes the correlation between the resonance amplitude and the magnetic force exerted on the magnetic sample to be tested; and calculating the product of the correlation coefficient and the resonance amplitude to obtain the magnetic force exerted on the magnetic sample to be tested.

[0068] Specifically, the correlation between the resonance amplitude and the magnetic force on the magnetic sample to be tested can be represented by the function f(m s ·w 2 ) characterization, f(m s ·w 2 ) is the same as w 2 、m s The value of is positively correlated with the function, w is the resonance frequency, m s is the mass of the magnetic sample, and the resonance frequency of the sample rod under the target gradient field and the mass of the magnetic sample to be measured are substituted into the function f(m s ·w 2 ), and obtain the function value, which is the correlation coefficient that characterizes the correlation between the resonance amplitude and the magnetic force exerted on the magnetic sample to be tested.

[0069] Furthermore, the relationship between the correlation coefficient, the resonance amplitude of the sample rod, and the magnetic force on the magnetic sample is obtained by the formula A = F / f (m s ·w 2 ), where F is the magnetic force on the magnetic sample, A is the measured vibration amplitude of the sample rod, and f(ms ·w 2 ) is the value of the correlation coefficient. After obtaining the correlation coefficient and the resonance amplitude of the sample rod under the target gradient field, according to the formula A=F / f(m s ·w 2 ) can determine the magnetic force exerted on the magnetic sample to be tested in the target gradient field.

[0070] Through this embodiment, the correlation coefficient characterizing the correlation between the resonance amplitude and the magnetic force exerted on the magnetic sample to be tested is calculated, and then combined with the relationship between the correlation coefficient, the resonance amplitude of the sample rod and the magnetic force exerted on the magnetic sample, the magnetic force exerted on the magnetic sample to be tested in the target gradient field can be accurately determined according to the resonance amplitude of the sample rod in the target gradient field, thereby laying a data foundation for accurately determining the magnetic moment parameters of the magnetic sample to be tested.

[0071] Optionally, in the magnetic moment parameter measurement method provided in the embodiment of the present application, determining the magnetic moment parameters of the magnetic sample to be measured based on the magnetic force exerted on the magnetic sample to be measured and the current parameters of the gradient coil in the magnetic field system includes: determining the gradient magnetic field multiplier based on the current parameters of the gradient coil; calculating the product of the gradient magnetic field multiplier and the magnetic force exerted on the magnetic sample to be measured to obtain the magnetization intensity of the magnetic sample to be measured, and determining the magnetization intensity as the magnetic moment parameter of the magnetic sample to be measured.

[0072] It should be noted that, because the magnetic force on the magnetic sample to be tested in the gradient field is only related to the magnetism of the magnetic sample to be tested and the current in the gradient coil, the current parameters of the current in the gradient coil are known, and the gradient magnetic field multiplier is determined according to the current parameters of the current in the gradient coil, and then the relationship between the gradient magnetic field multiplier, the magnetic force on the magnetic sample and the magnetization intensity of the magnetic sample is obtained, and the formula F = m t · C characterization, where C is the gradient magnetic field multiplier, m t is the magnetization intensity, F is the magnetic force exerted on the magnetic sample, after obtaining the gradient magnetic field multiplier and the magnetic force exerted on the magnetic sample to be tested, according to the formula F = m t C can calculate the magnetization intensity of the magnetic sample to be tested, and determine the magnetization intensity as the magnetic moment parameter of the magnetic sample to be tested.

[0073] Through this embodiment, the gradient magnetic field multiplier and the magnetic force exerted on the magnetic sample are determined, and then the magnetic moment parameters of the magnetic sample to be measured are determined based on the relationship between the gradient magnetic field multiplier, the magnetic force exerted on the magnetic sample and the magnetization intensity of the magnetic sample, which simplifies the intermediate steps of signal conversion, reduces the signal conversion requirements, and can improve the measurement accuracy of the sample magnetic moment.

[0074] Optionally, in the method for measuring magnetic moment parameters provided in an embodiment of the present application, determining the gradient magnetic field multiplier according to the current parameters of the gradient coil includes: determining the gradient of the gradient magnetic field in a preset direction, wherein the preset direction is the axial direction of the gradient coil; and calculating the product of the gradient in the preset direction and the vacuum magnetic permeability to obtain the gradient magnetic field multiplier.

[0075] Specifically, the current parameter may be current density. The current density is positively correlated with the gradient of the gradient magnetic field in the x direction. The x direction is the axial direction of the gradient coil. The gradient magnetic field multiplier may be determined by the following formula: Where C is the gradient magnetic field multiplier, μ 0 is the vacuum permeability, is the gradient of the gradient magnetic field in the x direction.

[0076] Through this embodiment, the gradient of the gradient magnetic field in a preset direction is determined, and the gradient magnetic field multiplier is determined according to the gradient in the preset direction and the vacuum permeability, thereby laying a data foundation for accurately determining the magnetic moment parameters of the magnetic sample to be tested.

[0077] According to an embodiment of the present application, another method for measuring magnetic moment parameters is provided.

[0078] Figure 3 FIG. 1 is a flow chart of another method for measuring magnetic moment parameters according to an embodiment of the present application. The method uses an alternating gradient field magnetometer for measurement, such as Figure 3 As shown, the method comprises the following steps:

[0079] Step S302: install the magnetic sample to be tested on the sample rod, and use a measuring device to detect the vibration frequency and amplitude of the sample rod.

[0080] The magnetic sample to be tested can be a magnetic material such as a magnet or a magnetic film. The magnetic field system is arranged near the sample rod on which the magnetic sample to be tested is installed, and is used to generate an alternating gradient field, which causes the magnetic sample to be tested to vibrate, and the magnetic sample to be tested drives the sample rod to vibrate.

[0081] Optionally, in the method for measuring magnetic moment parameters provided in an embodiment of the present application, the measuring device is a laser vibrometer, and the detection light of the laser vibrometer is irradiated onto the position of the sample rod where the magnetic sample to be measured is installed.

[0082] It should be noted that the laser vibrometer can accurately measure the vibration signal at the end of the sample rod with high elastic modulus, the vibration frequency and amplitude of the sample rod under the gradient field, and control the error within the nanometer range.

[0083] Step S304, changing the current passed through the gradient coil to change the amplitude and vibration frequency of the magnetic sample to be tested, and at least obtaining the resonance frequency and resonance amplitude of the magnetic sample to be tested.

[0084] It should be noted that, under different gradient magnetic fields, the magnetic sample to be tested drives the sample rod to vibrate differently. The gradient field is changed by changing the current passed through the gradient coil. When the frequency of the gradient magnetic field matches the vibration frequency of the sample rod, the sample rod resonates. The vibration frequency and amplitude of the sample rod under the resonance phenomenon are measured. The resonance frequency of the sample rod is the frequency at which the magnetic sample to be tested is driven by the magnetic force of the gradient field to generate the maximum amplitude of the sample rod. Since the magnetic sample to be tested is fixed on the sample rod, the resonance frequency and amplitude of the sample rod are the resonance frequency and amplitude of the magnetic sample to be tested.

[0085] Step S306, determining the magnetic moment parameters of the magnetic sample to be measured according to the resonance frequency, the resonance amplitude, the mass of the magnetic sample to be measured, and the current of the gradient coil.

[0086] It should be noted that the magnetic sample to be tested vibrates under the action of the magnetic force in the target gradient field, and drives the sample rod to generate a resonance amplitude. There is a correlation between the magnitude of the resonance amplitude and the magnetic force exerted on the magnetic sample to be tested. The correlation coefficient characterizing the correlation can be determined based on the resonance frequency of the sample rod and the mass of the magnetic sample to be tested. The magnitude of the magnetic force exerted on the magnetic sample to be tested can be calculated based on the correlation coefficient and the resonance amplitude.

[0087] When the gradient magnetic field is clear, the magnetic moment of the magnetic sample to be tested will directly determine the vibration of the magnetic sample and the sample rod. The gradient magnetic field is determined by the current parameters of the gradient coil in the magnetic field system, and the vibration of the magnetic sample and the sample rod is related to the magnetic force exerted on the magnetic sample to be tested. Therefore, the magnetic moment parameters of the magnetic sample to be tested can be determined based on the magnetic force exerted on the magnetic sample to be tested and the current parameters of the gradient coil.

[0088] This embodiment converts the magnetic moment signal of the magnetic sample to be measured into a vibration amplitude that can be measured by a high-sensitivity measuring device (for example, a laser vibrometer). On the one hand, the vibration frequency and vibration amplitude are obtained using the measuring device. The acquisition of the vibration frequency and vibration amplitude at a certain moment does not depend on the vibration frequency and vibration amplitude at the previous moment, so there is no error accumulation, which can avoid the problem of error accumulation and signal conversion difficulties in the laser vibration measurement process in the related technology. On the other hand, the displacement signal is directly collected, and the magnetic moment signal is directly obtained by solving the displacement signal, which realizes the direct conversion of "displacement-magnetic moment signal", and no longer depends on the conversion process of "displacement-pressure-piezoelectric-magnetic signal" in the related technology, simplifies the intermediate steps, reduces the signal conversion requirements, and can effectively reduce the measurement error and system complexity, and improve the measurement accuracy of the sample magnetic moment.

[0089] The mass of the magnetic sample to be tested can be determined based on the relationship between the resonant frequency of the sample rod and the mass of the magnetic sample that drives the sample rod to vibrate. Optionally, in the magnetic moment parameter measurement method provided in the embodiment of the present application, the measurement method also includes: detecting the resonant frequencies corresponding to N standard magnetic samples of known masses when they are respectively installed on the sample rod, and calculating the mass of the magnetic sample to be tested based on the resonant frequencies of the standard magnetic samples and the resonant frequencies of the magnetic sample to be tested.

[0090] The standard magnetic sample is a calibrated sample, that is, a magnetic sample that has been modulated and has known magnetic moment and mass, and can be a magnetic material such as a magnet or a magnetic film. The N standard magnetic samples have different masses and are not limited in variety. In an optional implementation, N can be a number greater than 10. This embodiment does not limit the number of N. The target mapping relationship can also be determined when the number is less than 10, but there is a certain error.

[0091] For N standard magnetic samples, one standard magnetic sample is installed on the sample rod each time, and current is passed through the gradient coil in the magnetic system to generate a gradient field to cause the standard magnetic sample and the sample rod to vibrate. The vibration of the standard magnetic sample and the sample rod is adjusted by adjusting the current passed through the gradient coil, and the vibration frequency and corresponding amplitude of the sample rod are measured using a measuring device until the resonant frequency and resonant amplitude are measured. Then, different standard magnetic materials are replaced on the same sample rod multiple times and the above steps are performed until the measurement of N standard magnetic samples is completed, and the resonant frequency and resonant amplitude generated when the N standard magnetic samples drive the sample rod to vibrate are measured.

[0092] Furthermore, a target mapping relationship between the resonance frequency and the sample mass is determined according to the masses of the N standard magnetic samples and the N resonance frequencies. The target mapping relationship may be in a tabular form, a curve form, or a formula form. When the resonance frequency of the sample rod under the target gradient field is measured, the mass of the magnetic sample to be measured may be determined based on the target mapping relationship.

[0093] Through this embodiment, the N resonance frequencies of the same sample rod driven by N standard magnetic samples are measured respectively, and the target mapping relationship is determined according to the mass of the N standard magnetic samples and the N resonance frequencies. When the resonance frequency of the sample rod under the target gradient field is measured, the mass of the magnetic sample to be measured can be accurately determined based on the target mapping relationship. It should be noted that this embodiment does not limit the method for determining the mass of the magnetic sample to be measured, and other high-precision mass measurement equipment can also be used to measure the mass of the magnetic sample to be measured.

[0094] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0095] The embodiment of the present application also provides a device for measuring magnetic moment parameters. It should be noted that the device for measuring magnetic moment parameters of the embodiment of the present application can be used to execute the method for measuring magnetic moment parameters provided in the embodiment of the present application. The device for measuring magnetic moment parameters provided in the embodiment of the present application is introduced below.

[0096] Figure 4 Schematic diagram of a device for measuring magnetic moment parameters according to an embodiment of the present application. Figure 4 As shown, the device includes: a measuring unit 402 , an acquiring unit 404 and a first determining unit 406 .

[0097] A measuring unit 402 is used to measure the resonance frequency and resonance amplitude of a sample rod on which a magnetic sample to be measured is mounted under a target gradient field, wherein the target gradient field is generated by a magnetic field system;

[0098] An acquisition unit 404 is used to acquire the mass of the magnetic sample to be tested, and determine the magnetic force exerted on the magnetic sample to be tested in the target gradient field according to the mass, the resonance frequency and the resonance amplitude;

[0099] The first determining unit 406 is used to determine the magnetic moment parameters of the magnetic sample to be tested according to the magnetic force exerted on the magnetic sample to be tested and the current parameters of the gradient coils in the magnetic field system.

[0100] Optionally, in the magnetic moment parameter measurement device provided in the embodiment of the present application, the measurement unit 402 includes: a control module, used to control the gradient coil to be in a powered-on state, wherein the magnetic field system generates a gradient field when the gradient coil is in a powered-on state, and the gradient field causes the magnetic sample to be measured to drive the sample rod to vibrate; an adjustment module, used to adjust the current passed into the gradient coil, and measure the vibration amplitude of the sample rod at different vibration frequencies until the resonant frequency and resonance amplitude of the sample rod are obtained.

[0101] Optionally, in the magnetic moment parameter measuring device provided in the embodiment of the present application, the acquisition unit 404 includes a mass acquisition module, which is used to acquire the mass of the magnetic sample to be measured, and the mass acquisition module includes: an installation submodule, which is used to install each of the N standard magnetic samples on the sample rod in turn, control the gradient coil to be in an energized state, and measure the resonance frequency of the sample rod driven by each standard magnetic sample to obtain N resonance frequencies; an acquisition submodule, which is used to acquire the mass of the N standard magnetic samples, and determine a target mapping relationship according to the mass of the N standard magnetic samples and the N resonance frequencies, wherein the target mapping relationship characterizes the relationship between the resonance frequency of the sample rod and the mass of the magnetic sample that drives the sample rod to vibrate; a first determination submodule, which is used to determine the mass of the magnetic sample to be measured based on the target mapping relationship and the resonance frequency of the sample rod under the target gradient field.

[0102] Optionally, in the magnetic moment parameter measuring device provided in the embodiment of the present application, the acquisition unit 404 includes a magnetic force determination module, which is used to determine the magnetic force exerted on the magnetic sample to be tested in the target gradient field according to the mass, the resonance frequency and the resonance amplitude, and the magnetic force determination module includes: a second determination submodule, which is used to determine the correlation coefficient according to the mass and the resonance frequency, wherein the correlation coefficient characterizes the correlation relationship between the resonance amplitude and the magnetic force exerted on the magnetic sample to be tested; and a first calculation submodule, which is used to calculate the product of the correlation coefficient and the resonance amplitude to obtain the magnetic force exerted on the magnetic sample to be tested.

[0103] Optionally, in the magnetic moment parameter measuring device provided in the embodiment of the present application, the first determination unit 406 includes: a gradient magnetic field multiplier determination module, used to determine the gradient magnetic field multiplier according to the current parameter of the gradient coil; a calculation module, used to divide the magnetic force exerted on the magnetic sample to be measured by the gradient magnetic field multiplier to obtain the magnetization intensity of the magnetic sample to be measured, and determine the magnetization intensity as the magnetic moment parameter of the magnetic sample to be measured.

[0104] Optionally, in the magnetic moment parameter measurement device provided in an embodiment of the present application, the gradient magnetic field multiplier determination module includes: a third determination submodule, used to determine the gradient of the gradient magnetic field in a preset direction, wherein the preset direction is the axial direction of the gradient coil; and a second calculation submodule, used to calculate the product of the gradient in the preset direction and the vacuum magnetic permeability to obtain the gradient magnetic field multiplier.

[0105] Optionally, in the device for measuring magnetic moment parameters provided in an embodiment of the present application, the elastic modulus of the sample rod is greater than 20 GPa.

[0106] Optionally, in the device for measuring magnetic moment parameters provided in an embodiment of the present application, the material of the sample rod is at least carbon fiber.

[0107] The magnetic moment parameter measuring device provided in the embodiment of the present application measures the resonance frequency and resonance amplitude of the sample rod on which the magnetic sample to be measured is installed under the target gradient field through the measuring unit 402, wherein the target gradient field is generated by the magnetic field system; the acquiring unit 404 acquires the mass of the magnetic sample to be measured, and determines the magnetic force received by the magnetic sample to be measured in the target gradient field according to the mass, the resonance frequency and the resonance amplitude; the first determining unit 406 determines the magnetic moment parameter of the magnetic sample to be measured according to the magnetic force received by the magnetic sample to be measured and the current parameter of the gradient coil in the magnetic field system, thereby solving the problem of high equipment cost and low measurement accuracy when performing magnetic measurement on the magnetic sample to be measured in the related art, determining the magnetic force received by the magnetic sample to be measured through the mass of the magnetic sample to be measured, the resonance frequency and the resonance amplitude of the sample rod, and determining the magnetic moment parameter of the magnetic sample to be measured in combination with the magnetic force received by the magnetic sample to be measured and the current parameter of the gradient coil, thereby achieving the effect of reducing the equipment cost and improving the measurement accuracy when performing magnetic measurement on the magnetic sample to be measured.

[0108] The magnetic moment parameter measuring device comprises a processor and a memory. The measuring unit 402, the acquiring unit 404 and the first determining unit 406 are all stored in the memory as program units. The processor executes the program units stored in the memory to realize corresponding functions.

[0109] The processor includes a kernel, which retrieves the corresponding program unit from the memory. One or more kernels can be set, and the problems of high equipment cost and low measurement accuracy in magnetic measurement of magnetic samples to be measured in related technologies can be solved by adjusting kernel parameters.

[0110] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0111] Figure 5 Schematic diagram of another device for measuring magnetic moment parameters according to an embodiment of the present application. An alternating gradient field magnetometer is used for measurement, such as Figure 5 As shown, the device includes: a detection unit 502 , an adjustment unit 504 and a second determination unit 506 .

[0112] The detection unit 502 is used to install the magnetic sample to be tested on the sample rod, and use a measuring device to detect the vibration frequency and amplitude of the sample rod.

[0113] The adjustment unit 504 is used to change the current passed into the gradient coil to change the amplitude and vibration frequency of the magnetic sample to be tested, and at least obtain the resonance frequency and resonance amplitude of the magnetic sample to be tested.

[0114] The second determining unit 506 is used to determine the magnetic moment parameters of the magnetic sample to be measured according to the resonance frequency, the resonance amplitude, the mass of the magnetic sample to be measured, and the current of the gradient coil.

[0115] Optionally, in the device for measuring magnetic moment parameters provided in an embodiment of the present application, the measuring device further includes: a calculation unit, for detecting the resonance frequencies corresponding to N standard magnetic samples of known mass when they are respectively installed on the sample rod, and calculating the mass of the magnetic sample to be measured based on the resonance frequencies of the standard magnetic samples and the resonance frequencies of the magnetic samples to be measured.

[0116] Optionally, in the apparatus for measuring magnetic moment parameters provided in an embodiment of the present application, the measuring device is a laser vibrometer, and the detection light of the laser vibrometer is irradiated onto the position of the sample rod where the magnetic sample to be measured is installed.

[0117] The magnetic moment parameter measuring device provided in the embodiment of the present application, through the detection unit 502, installs the magnetic sample to be measured on the sample rod, and uses the measuring equipment to detect the vibration frequency and amplitude of the sample rod; the adjustment unit 504 changes the current passed through the gradient coil to change the amplitude and vibration frequency of the magnetic sample to be measured, and at least obtains the resonance frequency and resonance amplitude of the magnetic sample to be measured; the second determination unit 506 determines the magnetic moment parameter of the magnetic sample to be measured according to the resonance frequency, the resonance amplitude, the mass of the magnetic sample to be measured, and the current of the gradient coil, thereby solving the problem of high equipment cost and low measurement accuracy when performing magnetic measurement on the magnetic sample to be measured in the related art, determining the magnetic force exerted on the magnetic sample to be measured by the mass of the magnetic sample to be measured, the resonance frequency and the resonance amplitude of the sample rod, and determining the magnetic moment parameter of the magnetic sample to be measured in combination with the magnetic force exerted on the magnetic sample to be measured and the current parameter of the gradient coil, thereby achieving the effect of reducing the equipment cost and improving the measurement accuracy when performing magnetic measurement on the magnetic sample to be measured.

[0118] The magnetic moment parameter measuring device comprises a processor and a memory. The detection unit 502, the adjustment unit 504 and the second determination unit 506 are stored in the memory as program units. The processor executes the program units stored in the memory to realize corresponding functions.

[0119] The processor includes a kernel, which retrieves the corresponding program unit from the memory. One or more kernels can be set, and the problems of high equipment cost and low measurement accuracy in magnetic measurement of magnetic samples to be measured in related technologies can be solved by adjusting kernel parameters.

[0120] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0121] The embodiment of the present application also provides a computer storage medium, which is used to store a program, wherein when the program is running, the device where the non-volatile storage medium is located is controlled to execute the following method for measuring magnetic moment parameters: measuring the resonance frequency and resonance amplitude of a sample rod with a magnetic sample to be tested installed under a target gradient field, wherein the target gradient field is generated by a magnetic field system; obtaining the mass of the magnetic sample to be tested, and determining the magnetic force exerted on the magnetic sample to be tested in the target gradient field according to the mass, the resonance frequency and the resonance amplitude; determining the magnetic moment parameters of the magnetic sample to be tested according to the magnetic force exerted on the magnetic sample to be tested and the current parameters of the gradient coil in the magnetic field system.

[0122] The embodiment of the present application also provides an electronic device, Figure 6 : is a schematic diagram of an electronic device according to an embodiment of the present application, wherein the electronic device 60 comprises a processor and a memory; the memory stores computer-readable instructions, and the processor is used to run the computer-readable instructions, wherein the computer-readable instructions execute the following method for measuring magnetic moment parameters when they are run: measuring the resonance frequency and resonance amplitude of a sample rod equipped with a magnetic sample to be tested under a target gradient field, wherein the target gradient field is generated by a magnetic field system; obtaining the mass of the magnetic sample to be tested, and determining the magnetic force received by the magnetic sample to be tested in the target gradient field according to the mass, the resonance frequency and the resonance amplitude; determining the magnetic moment parameters of the magnetic sample to be tested according to the magnetic force received by the magnetic sample to be tested and the current parameters of the gradient coil in the magnetic field system. The electronic device in this article may be a server, a PC, a PAD, a mobile phone, etc.

[0123] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0124] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1A device that provides the functions specified in a block or multiple blocks.

[0125] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0126] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0127] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0128] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0129] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0130] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0131] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for measuring magnetic moment parameters, characterized in that: include: Measuring the resonance frequency and resonance amplitude of a sample rod on which a magnetic sample to be measured is mounted under a target gradient field, wherein the target gradient field is generated by a magnetic field system; Acquiring the mass of the magnetic sample to be tested, and determining the magnetic force exerted on the magnetic sample to be tested in the target gradient field according to the mass, the resonance frequency and the resonance amplitude; The magnetic moment parameters of the magnetic sample to be tested are determined according to the magnetic force exerted on the magnetic sample to be tested and the current parameters of the gradient coils in the magnetic field system.

2. The method according to claim 1, characterized in that Measuring the resonance frequency and resonance amplitude of the sample holder with the magnetic sample to be tested under the target gradient field includes: Controlling the gradient coil to be in a powered-on state, wherein the magnetic field system generates a gradient field when the gradient coil is in the powered-on state, and the gradient field causes the magnetic sample to be tested to drive the sample rod to vibrate; The current passed into the gradient coil is adjusted, and the vibration amplitude of the sample rod at different vibration frequencies is measured until the resonance frequency and the resonance amplitude of the sample rod are obtained.

3. The method according to claim 1, characterized in that Obtaining the mass of the magnetic sample to be tested includes: Sequentially installing each of the N standard magnetic samples on the sample rod, controlling the gradient coil to be in an energized state, and measuring the resonance frequency of the sample rod driven by each standard magnetic sample to obtain N resonance frequencies; Acquiring the masses of the N standard magnetic samples, and determining a target mapping relationship according to the masses of the N standard magnetic samples and the N resonance frequencies, wherein the target mapping relationship represents a relationship between the resonance frequency of the sample rod and the mass of the magnetic sample that drives the sample rod to vibrate; The mass of the magnetic sample to be measured is determined based on the target mapping relationship and the resonance frequency of the sample rod under the target gradient field.

4. The method according to claim 1, characterized in that Determining the magnetic force exerted on the magnetic sample to be tested in the target gradient field according to the mass, the resonance frequency and the resonance amplitude includes: Determining a correlation coefficient according to the mass and the resonance frequency, wherein the correlation coefficient represents a correlation relationship between the resonance amplitude and the magnetic force exerted on the magnetic sample to be tested; The product of the correlation coefficient and the resonance amplitude is calculated to obtain the magnetic force exerted on the magnetic sample to be tested.

5. The method according to claim 1, characterized in that Determining the magnetic moment parameter of the magnetic sample to be tested according to the magnetic force exerted on the magnetic sample to be tested and the current parameter of the gradient coil in the magnetic field system includes: Determining a gradient magnetic field multiplier according to a current parameter of the gradient coil; The magnetic force exerted on the magnetic sample to be tested is divided by the gradient magnetic field multiplier to obtain the magnetization intensity of the magnetic sample to be tested, and the magnetization intensity is determined as the magnetic moment parameter of the magnetic sample to be tested.

6. The method according to claim 5, characterized in that Determining the gradient magnetic field multiplier according to the current parameter of the gradient coil comprises: Determining the gradient of the gradient magnetic field in a preset direction, wherein the preset direction is the axial direction of the gradient coil; The product of the gradient in the preset direction and the vacuum magnetic permeability is calculated to obtain the gradient magnetic field multiplier.

7. The method according to claim 1, characterized in that The elastic modulus of the sample rod is greater than 20 GPa.

8. The method according to claim 1, characterized in that The material of the sample rod is at least carbon fiber.

9. A method for measuring magnetic moment parameters using an alternating gradient field magnetometer, characterized in that: The magnetic sample to be tested is mounted on a sample rod, and a measuring device is used to detect the vibration frequency and amplitude of the sample rod; Changing the current passed through the gradient coil to change the amplitude and vibration frequency of the magnetic sample to be tested, and at least obtaining the resonance frequency and resonance amplitude of the magnetic sample to be tested; The magnetic moment parameter of the magnetic sample to be measured is determined according to the resonance frequency, the resonance amplitude, the mass of the magnetic sample to be measured, and the current of the gradient coil.

10. A method for measuring magnetic moment parameters according to claim 9, characterized in that: The measurement method also includes: detecting the resonance frequencies corresponding to N standard magnetic samples of known mass when they are respectively installed on the sample rod, and calculating the mass of the magnetic sample to be measured according to the resonance frequencies of the standard magnetic samples and the resonance frequencies of the magnetic sample to be measured.

11. A method for measuring magnetic moment parameters according to claim 9, characterized in that: The measuring device is a laser vibrometer, and the detection light of the laser vibrometer is irradiated onto the position of the sample rod where the magnetic sample to be measured is installed.

12. A magnetic moment parameter measurement system, characterized in that: include: Sample holder, used to mount magnetic samples; A magnetic field system is arranged within a first preset distance range of the sample rod, wherein the magnetic field system comprises a magnet and a gradient coil, and a gradient field is generated when the gradient coil is powered on, and the magnetic sample drives the sample rod to vibrate through the gradient field; A measuring device, disposed within a second preset distance range of the sample rod, for measuring a vibration frequency and a vibration amplitude of the sample rod under the gradient field; A controller is connected to the magnetic field system and the measuring device, and is used to control the current passed into the gradient coil, and execute the magnetic moment parameter measurement method described in any one of claims 1 to 11 based on the data measured by the measuring device.

13. A computer storage medium, characterized in that: The computer storage medium is used to store a program, wherein when the program is run, the device where the computer storage medium is located is controlled to execute the method for measuring magnetic moment parameters as described in any one of claims 1 to 11.

14. An electronic device comprising a memory and a processor, characterized in that: The memory stores a computer program, and the processor is configured to execute the method for measuring the magnetic moment parameters according to any one of claims 1 to 11 through the computer program.

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