Device and method for testing material magnetic permeability temperature stability based on atomic magnetometer

Abstract

The invention relates to a material magnetic permeability temperature stability testing device and method based on an atomic magnetometer, characterized in that the device comprises an atomic magnetometer, a magnetic material layer, a flexible heating coil, a temperature sensor, a simulated magnetic field coil, a magnetic shielding unit, a magnetic field control module, a temperature data acquisition module, a temperature control module, a magnetometer circuit acquisition control module, and a multifunctional host computer. The atomic magnetometer tests the magnetic shielding coefficient of the magnetic material layer. After the flexible heating coil heats the magnetic material layer to a specific temperature, the atomic magnetometer measures magnetic noise and incorporates the magnetic noise into the relationship between the shielding coefficient and the magnetic permeability to calculate the material magnetic permeability at different temperatures. The temperature stability of the material magnetic permeability is analyzed, which is conducive to in-situ measurement of the magnetic permeability temperature stability of the formed magnetic shielding barrel material. At the same time, the device can effectively avoid the problems of multiple measurements, the influence of the number of coil turns, and the inability to flexibly adjust the test voltage and frequency in traditional magnetic permeability testing methods.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic material testing, and in particular to a device and method for testing the temperature stability of material magnetic permeability based on an atomic magnetometer. Background Art

[0002] With the development of science and technology, the reliability requirements for electronic products are becoming increasingly stringent. As an important electronic material, the temperature stability of magnetic materials directly determines the reliability of electronic products. Currently, with the development of high-precision technology, especially in the field of quantum precision measurement, magnetic materials are widely used to shield against environmental electromagnetic interference. This requires magnetic materials to have not only high magnetic permeability and low loss, but also improved temperature stability of magnetic permeability and low loss to ensure that quantum precision measurement instruments can operate for a long time in space, deep sea, and other harsh environments.

[0003] The temperature stability of a magnetic material's magnetic permeability represents the ratio of the relative change in magnetic permeability due to temperature changes to the temperature change. In the field of quantum precision measurement, especially for atomic sensors, the sensitive element is typically heated above 100°C. Thermal convection and radiation cause temperature changes on the surface of the magnetic shielding barrel, leading to changes in the magnetic permeability of the magnetic material. This generates magnetic noise, which limits the measurement sensitivity of the atomic sensor. To ensure high-performance magnetic shielding over a long period of time, magnetic materials with high temperature stability are required. The magnetic permeability of a magnetic material is proportional to the square of the saturation magnetization and inversely proportional to the product of magnetocrystalline anisotropy, magnetostriction coefficient, and internal stress. These parameters are all affected by temperature, making magnetic permeability a complex function of temperature. To analyze the temperature stability of magnetic permeability, it is necessary to measure the magnetic permeability at different temperatures. Currently, traditional magnetic permeability testing methods primarily involve winding a few turns of coil around a magnetic sample ring, measuring the inductance, and calculating the magnetic permeability. However, magnetic sample rings typically use standard dimensions, which differ significantly from the actual shape of the magnetic shielding barrel, making in-situ permeability measurement of the shielding barrel material impossible. Furthermore, traditional permeability testing methods are significantly affected by the test instrument and the number of coil turns. For the same sample, different instruments and coil turns can produce significantly different permeabilities. Furthermore, analyzing permeability temperature stability using traditional permeability testing methods requires first heating the sample coil to a set temperature before measuring the permeability. This process, repeated at multiple temperatures, is highly complex.

[0004] To address this issue, we discovered through research that the magnetic permeability of magnetic materials can be calculated by solving the relationship between magnetic noise and shielding coefficient. Magnetic noise can be measured using an atomic magnetometer, while temperature information can be monitored in real time using a temperature sensor. Therefore, we proposed a device and method for testing the temperature stability of material magnetic permeability using an atomic magnetometer. This device can in situ measure the temperature stability of magnetic permeability in magnetic shielding barrels at different temperatures. Our research has not yet revealed similar technical solutions. Summary of the Invention

[0005] In view of the defects or deficiencies in the prior art, the present invention provides a material magnetic permeability temperature stability testing device based on an atomic magnetometer.

[0006] The technical solutions of the present invention are as follows:

[0007] The material magnetic permeability temperature stability testing device based on an atomic magnetometer is characterized by comprising an atomic magnetometer (1), a magnetic material layer (2), a flexible heating coil (3), a temperature sensor (4), a simulated magnetic field coil (5), a magnetic shielding unit (6), a magnetic field control module (7), a temperature data acquisition module (8), a temperature control module (9), a magnetometer circuit acquisition control module (10) and a multifunctional host computer (11), wherein the atomic magnetometer (1) is arranged in the central area of ​​the inner cavity of the magnetic material layer (2) and is connected to the magnetometer circuit acquisition control module (10), and the flexible heating coil (3) is attached to the outer surface of the magnetic material layer (2) and is connected to the temperature control module (9). ), a temperature sensor (4) is placed on the magnetic material layer (2) and connected to a temperature data acquisition module (8), the temperature data acquisition module (8) is connected to a temperature control module (9), a simulated magnetic field coil (5) is connected to a magnetic field control module (7), the temperature control module (9) and a magnetometer circuit acquisition control module (10) are respectively connected to a multifunctional host computer (11), the simulated magnetic field coil (5) provides a magnetic field signal of a certain frequency to calculate the shielding coefficient of the magnetic material layer (2), the atomic magnetometer (1) measures the magnetic noise, and brings the magnetic noise into the relationship between the shielding coefficient and the magnetic permeability to calculate the material magnetic permeability at different temperatures, and analyzes the temperature stability of the material magnetic permeability.

[0008] The temperature sensor is placed on the inner surface of the magnetic material layer, and the sensitivity of the atomic magnetometer (1) is lower than the magnetic noise δB of the magnetic material. mag , the magnetic material layer (2) is in the shape of a closed cylindrical shell with a finite length.

[0009] The heating power per square centimeter of the flexible heating coil (3) is greater than 0.4W, the temperature range of the heated magnetic material layer (2) is 35°C to 150°C, the temperature data acquisition module (8) uses a digital display instrument with an acquisition accuracy of less than 0.2%, the control accuracy of the temperature control module (9) is less than 0.1°C, and the temperature fluctuation of the magnetic material layer (2) is less than ±0.1°C.

[0010] The simulated magnetic field coil (5) provides a magnetic field signal of 1 nT to 10000 nT at a certain frequency.

[0011] The expression of the shielding coefficient is as follows:

[0012]

[0013] Wherein S is the shielding coefficient, B1 is the magnetic field signal with a frequency of f1 provided by the simulated magnetic field coil (5), and B0 is the remanent magnetism of the central area of ​​the magnetic material layer (2) measured by the atomic magnetometer (1).

[0014] The expression of the magnetic permeability includes the following expression of the real part of the magnetic permeability μ'(T) and the imaginary part of the magnetic permeability μ"(T):

[0015]

[0016]

[0017] Where f1 is the frequency, G is the shape factor, k B is the Boltzmann constant, r is the radius of the cylindrical shell, S is the shielding coefficient, t is the thickness of the cylindrical shell, T is the temperature, T1 is the temperature of the magnetic material layer (2), μ0 is the vacuum permeability, δB mag is the magnetic noise measured by the atomic magnetometer (1).

[0018] The temperature stability of the material's magnetic permeability is determined by the magnetic permeability temperature coefficient expression, which includes the following magnetic permeability temperature coefficient real part α μ′ (f1) expression and imaginary part α of the temperature coefficient of magnetic permeability μ″ (f1) Expression:

[0019]

[0020]

[0021] The larger the absolute value of the temperature coefficient, the worse the temperature stability of the magnetic permeability; the smaller the absolute value of the temperature coefficient, the better the temperature stability of the magnetic permeability.

[0022] A method for testing the temperature stability of material magnetic permeability based on an atomic magnetometer, characterized by comprising the following steps:

[0023] Step S1, constructing the material magnetic permeability temperature stability testing device based on the atomic magnetometer;

[0024] Step S2, the simulated magnetic field coil (5) provides a magnetic field signal B1 of a certain frequency, the atomic magnetometer (1) measures the remanence B0 of the central area of ​​the magnetic material layer (2), and transmits the information to the magnetometer circuit acquisition control module (8), and the information is displayed on the host computer (9) after processing;

[0025] Step S3, calculating the shielding coefficient of the magnetic material layer (2), and calculating the shielding coefficient of the magnetic material layer (2) from the magnetic field signal according to the shielding coefficient formula;

[0026] Step S4, the flexible heating coil (3) heats the magnetic material layer (2) to a temperature of T1°C, the host computer (11) outputs an instruction to the temperature control module (9), controls the flexible heating coil (3) to heat the magnetic material layer (2), the temperature sensor (4) measures the inner surface temperature of the magnetic material layer (2), converts the temperature signal into an electrical signal and sends it to the temperature data acquisition module (8), the temperature data acquisition module (8) processes the electrical signal and transmits it to the temperature control module (9), and the temperature control module (9) controls the magnetic material layer (2) to be at a temperature of T1°C with a fluctuation of less than ±0.1°C;

[0027] In step S5, the atomic magnetometer (1) measures magnetic noise. After the magnetic material layer (2) is heated to T1°C, the atomic magnetometer (1) measures the magnetic noise in the central area of ​​the magnetic material layer (2) and transmits the information to the magnetometer circuit acquisition control module (10). After the information is processed, it is displayed on the host computer (11). The host computer (11) performs Fourier transform on the time domain magnetic noise signal of the atomic magnetometer to obtain the magnetic noise δB of the magnetic material layer (2) at the frequency f1. mag (T1);

[0028] Step S6, calculate the material magnetic permeability at different temperatures using the magnetic permeability formula, and convert the measured magnetic noise δb mag Substitute (T1) and frequency f1 into the magnetic permeability formula to calculate the material permeability;

[0029] Step S7: analyzing the temperature stability of the material's magnetic permeability and calculating the temperature coefficient of the material's magnetic permeability.

[0030] The shielding coefficient formula in step S3 is as follows:

[0031]

[0032] Wherein B1 is the simulated magnetic field coil (5) providing a magnetic field signal with a frequency of f1, and B0 is the atomic magnetometer (1) measuring the remanent magnetism of the central area of ​​the magnetic material layer (2);

[0033] The magnetic permeability formula in step S6 is as follows:

[0034]

[0035]

[0036] Where f1 is the frequency, G is the shape factor, k B is the Boltzmann constant, r is the radius of the cylindrical shell, S is the shielding coefficient, t is the thickness of the cylindrical shell, T1 is the temperature of the magnetic material layer (2), μ0 is the vacuum permeability, δB mag is the magnetic noise measured by the atomic magnetometer (1).

[0037] The magnetic permeability temperature coefficient expression in step S7 is as follows:

[0038]

[0039]

[0040] The larger the absolute value of the temperature coefficient, the worse the temperature stability of the magnetic permeability; the smaller the absolute value of the temperature coefficient, the better the temperature stability of the magnetic permeability.

[0041] The technical effects of the present invention are as follows: Compared to existing technologies, the present device and method for testing the temperature stability of material magnetic permeability, based on an atomic magnetometer, address the problem that traditional magnetic permeability testing methods can only measure magnetic rings of specific shapes and cannot in-situ measure the temperature stability of the magnetic permeability of formed magnetic shielding barrel materials. In other words, the present invention is suitable for in-situ measurement of the temperature stability of the magnetic permeability of formed magnetic shielding barrel materials. The present invention also effectively avoids issues inherent in traditional magnetic permeability testing methods, such as multiple measurements, the influence of coil turns, and the inability to flexibly adjust the test voltage and frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 The present invention is a schematic structural diagram of a device for testing the temperature stability of magnetic permeability of a material based on an atomic magnetometer.

[0043] Figure 2 The present invention is a flow chart of a method for testing the temperature stability of magnetic permeability of a material based on an atomic magnetometer. Figure 1 The method includes step 1, placing each component inside and outside the magnetic shielding unit; step 2, simulating the magnetic field coil to provide a magnetic field signal of a certain frequency; step 3, calculating the shielding coefficient of the magnetic material layer; step 4, the flexible heating coil heats the magnetic material layer to a specific temperature; step 5, the atomic magnetometer measures the magnetic noise; step 6, calculating the magnetic permeability of the material at different temperatures using the magnetic permeability formula; step 7, analyzing the temperature stability of the material magnetic permeability.

[0044] The description of the accompanying figures is as follows: 1-atomic magnetometer; 2-magnetic material layer; 3-flexible heating coil; 4-temperature sensor; 5-simulated magnetic field coil; 6-magnetic shielding unit; 7-magnetic field control module; 8-temperature data acquisition module; 9-temperature control module; 10-magnetometer circuit acquisition control module; 11-multi-function host computer (or host computer). DETAILED DESCRIPTION

[0045] Below is the attached figure ( Figure 1-Figure 2 ) and Examples illustrate the present invention.

[0046] Figure 1 The present invention is a schematic structural diagram of a device for testing the temperature stability of magnetic permeability of a material based on an atomic magnetometer. Figure 2 This is a flow chart of the method for testing the temperature stability of magnetic permeability of materials based on an atomic magnetometer according to the present invention. Figures 1 to 2 As shown, a material magnetic permeability temperature stability testing device based on an atomic magnetometer comprises an atomic magnetometer (1), a magnetic material layer (2), a flexible heating coil (3), a temperature sensor (4), a simulated magnetic field coil (5), a magnetic shielding unit (6), a magnetic field control module (7), a temperature data acquisition module (8), a temperature control module (9), a magnetometer circuit acquisition control module (10) and a multifunctional host computer (11), wherein the atomic magnetometer (1) is arranged in the central area of ​​the inner cavity of the magnetic material layer (2) and is connected to the magnetometer circuit acquisition control module (10), and the flexible heating coil (3) is attached to the outer surface of the magnetic material layer (2) and is connected to the temperature control module (9). The temperature sensor (4) is placed on the magnetic material layer (2) and connected to the temperature data acquisition module (8), the temperature data acquisition module (8) is connected to the temperature control module (9), the analog magnetic field coil (5) is connected to the magnetic field control module (7), the temperature control module (9) and the magnetometer circuit acquisition control module (10) are respectively connected to the multifunctional host computer (11), the analog magnetic field coil (5) provides a magnetic field signal of a certain frequency to calculate the shielding coefficient of the magnetic material layer (2), the atomic magnetometer (1) measures the magnetic noise, and brings the magnetic noise into the relationship between the shielding coefficient and the magnetic permeability to calculate the material magnetic permeability at different temperatures, and analyzes the temperature stability of the material magnetic permeability. The temperature sensor is placed on the inner surface of the magnetic material layer, and the sensitivity of the atomic magnetometer (1) is lower than the magnetic noise δB of the magnetic material. mag The magnetic material layer (2) is in the shape of a closed cylindrical shell of finite length. The heating power per square centimeter of the flexible heating coil (3) is greater than 0.4W, and the temperature range of the heated magnetic material layer (2) is 35°C to 150°C. The temperature data acquisition module (8) uses a digital display instrument with an acquisition accuracy of less than 0.2%. The control accuracy of the temperature control module (9) is less than 0.1°C, and the temperature fluctuation of the magnetic material layer (2) is less than ±0.1°C. The simulated magnetic field coil (5) provides a magnetic field signal of 1nT to 10000nT at a certain frequency.

[0047] The expression of the shielding coefficient is as follows:

[0048]

[0049] Where S is the shielding coefficient, B1 is the magnetic field signal with a frequency of f1 provided by the simulated magnetic field coil (5), and B0 is the remanent magnetism of the central area of ​​the magnetic material layer (2) measured by the atomic magnetometer (1). The expression of the magnetic permeability includes the following expression of the real part of the magnetic permeability μ'(T) and the imaginary part of the magnetic permeability μ"(T):

[0050]

[0051]

[0052] Where f1 is the frequency, G is the shape factor, k B is the Boltzmann constant, r is the radius of the cylindrical shell, S is the shielding coefficient, t is the thickness of the cylindrical shell, T is the temperature, T1 is the temperature of the magnetic material layer (2), μ0 is the vacuum permeability, δB mag is the magnetic noise measured by the atomic magnetometer (1). The temperature stability of the material's magnetic permeability is determined by the expression for the temperature coefficient of magnetic permeability, which includes the following: the real part of the temperature coefficient of magnetic permeability α μ′ (f1) expression and imaginary part α of the temperature coefficient of magnetic permeability μ″ (f1) Expression:

[0053]

[0054]

[0055] The larger the absolute value of the temperature coefficient, the worse the temperature stability of the magnetic permeability; the smaller the absolute value of the temperature coefficient, the better the temperature stability of the magnetic permeability.

[0056] The material magnetic permeability temperature stability testing method based on an atomic magnetometer comprises the following steps: step S1, constructing the material magnetic permeability temperature stability testing device based on an atomic magnetometer; step S2, simulating a magnetic field coil (5) to provide a magnetic field signal B1 of a certain frequency, the atomic magnetometer (1) measuring the remanence B0 of the central area of ​​the magnetic material layer (2), and transmitting the information to a magnetometer circuit acquisition control module (8), which is displayed on a host computer (9) after processing; step S3, calculating the shielding coefficient of the magnetic material layer (2), and calculating the shielding coefficient of the magnetic material layer (2) from the magnetic field signal according to a shielding coefficient formula; step S4, a flexible heating coil (3) heating the magnetic material layer (2) to a temperature of T1°C, and the host computer (11) outputting an instruction to a temperature control module (9) to control the flexible heating coil (3) to heat the magnetic material layer (2). The magnetic material layer (2) is heated to T1°C, and the atomic magnetometer (1) measures the magnetic noise in the central area of ​​the magnetic material layer (2), and transmits the information to the magnetometer circuit acquisition control module (10). After the information is processed, the information is displayed on the host computer (11). The host computer (11) performs Fourier transform on the time domain magnetic noise signal of the atomic magnetometer to obtain the magnetic noise δB of the magnetic material layer (2) at the frequency f1. mag (T1); Step S6, calculate the magnetic permeability of the material at different temperatures by the magnetic permeability formula, and measure the magnetic noise δB mag (T1) and frequency f1 are substituted into the magnetic permeability formula to calculate the material magnetic permeability; step S7, analyzing the temperature stability of the material magnetic permeability and calculating the temperature coefficient of the material magnetic permeability.

[0057] The shielding coefficient formula in step S3 is as follows:

[0058]

[0059] Wherein B1 is the simulated magnetic field coil (5) providing a magnetic field signal with a frequency of f1, and B0 is the atomic magnetometer (1) measuring the remanence of the central area of ​​the magnetic material layer (2); the magnetic permeability formula in step S6 is as follows:

[0060]

[0061]

[0062] Where f1 is the frequency, G is the shape factor, k Bis the Boltzmann constant, r is the radius of the cylindrical shell, S is the shielding coefficient, t is the thickness of the cylindrical shell, T1 is the temperature of the magnetic material layer (2), μ0 is the vacuum permeability, δB mag is the magnetic noise measured by the atomic magnetometer (1). The expression of the temperature coefficient of magnetic permeability in step S7 is as follows:

[0063]

[0064]

[0065] The larger the absolute value of the temperature coefficient, the worse the temperature stability of the magnetic permeability; the smaller the absolute value of the temperature coefficient, the better the temperature stability of the magnetic permeability.

[0066] The present invention relates to an atomic magnetometer-based device and method for testing the temperature stability of material magnetic permeability. The device comprises an atomic magnetometer, a magnetic material layer, a flexible heating coil, a temperature sensor, a simulated magnetic field coil, a magnetic shielding unit, a magnetic field control module, a temperature data acquisition module, a temperature control module, a magnetometer circuit acquisition and control module, and a multifunctional host computer. The atomic magnetometer tests the magnetic shielding coefficient of the magnetic material layer. After the flexible heating coil heats the magnetic material layer to a specific temperature, the atomic magnetometer measures magnetic noise, incorporates the magnetic noise into the equation for the shielding coefficient and magnetic permeability, calculates the material's magnetic permeability at different temperatures, and analyzes the material's magnetic permeability temperature stability. The device is simple and addresses the problem that traditional magnetic permeability testing methods can only measure magnetic rings of specific shapes and cannot in-situ measure the magnetic permeability temperature stability of formed magnetic shielding barrel materials. Furthermore, the device effectively avoids the problems inherent in traditional magnetic permeability testing methods, such as multiple measurements, the influence of coil turns, and the inability to flexibly adjust the test voltage and frequency.

[0067] The present invention provides a device and method for testing the temperature stability of material magnetic permeability based on an atomic magnetometer. The device and method can realize the testing of the magnetic shielding coefficient of a magnetic material layer using the atomic magnetometer. After the flexible heating coil heats the magnetic material layer to a specific temperature, the atomic magnetometer measures the magnetic noise and incorporates the magnetic noise into the relationship between the shielding coefficient and the magnetic permeability to calculate the material magnetic permeability at different temperatures and analyze the temperature stability of the material magnetic permeability.

[0068] The device of the present invention is simple and solves the problem that the traditional magnetic permeability test method can only measure magnetic rings of specific shapes and cannot measure the temperature stability of the magnetic permeability of the formed magnetic shielding barrel material in situ.

[0069] The device of the present invention can effectively avoid the problems of multiple measurements, influence of coil turns, and inability to flexibly adjust test voltage and frequency in traditional magnetic permeability testing methods.

[0070] Specific implementation plan 1: Combined Figure 1As shown, the present invention provides a material magnetic permeability temperature stability testing device based on an atomic magnetometer, the device comprising an atomic magnetometer (1), a magnetic material layer (2), a flexible heating coil (3), a temperature sensor (4), a simulated magnetic field coil (5), a magnetic shielding unit (6), a magnetic field control module (7), a temperature data acquisition module (8), a temperature control module (9), a magnetometer circuit acquisition control module (10) and a multifunctional host computer (11), wherein the atomic magnetometer (1) is arranged in the central area of ​​the magnetic material layer (2) and is connected to the magnetometer circuit. The invention relates to a circuit acquisition control module (10), a flexible heating coil (3) is attached to the outer surface of the magnetic material layer (2) and is connected to a temperature control module (9), a temperature sensor (4) is placed on the inner surface of the magnetic material layer (2) and is connected to a temperature data acquisition module (8), the temperature data acquisition module (8) is connected to the temperature control module (9), the simulated magnetic field coil (5) is connected to the magnetic field control module (7) and can output a magnetic field signal of a specific frequency, and the temperature control module (9) and the magnetometer circuit acquisition control module (10) are simultaneously connected to a multifunctional host computer (11).

[0071] Specific implementation plan 2: Figure 1 As shown, the sensitivity of the atomic magnetometer (1) is lower than the magnetic noise δB of the magnetic material. mag , the magnetic material layer (2) is in the shape of a closed cylindrical shell of finite length;

[0072] Specific implementation plan three: Figure 1 As shown, the heating power per square centimeter of the flexible heating coil (3) is greater than 0.4W, the temperature range of the heated magnetic material layer (2) is 35°C to 150°C, the temperature data acquisition module (8) uses a digital display instrument with an acquisition accuracy of less than 0.2%, the control accuracy of the temperature control module (9) is less than 0.1°C, and the temperature fluctuation of the magnetic material layer (2) is less than ±0.1°C;

[0073] Specific implementation plan four: Figure 1 As shown, the simulated magnetic field coil (5) provides a magnetic field signal of 1nT to 10000nT at a specific frequency;

[0074] Specific implementation plan five: Figure 2 As shown, a method for testing the temperature stability of material magnetic permeability based on an atomic magnetometer comprises the following steps:

[0075] Step S1, the atomic magnetometer (1), the magnetic material layer (2), the flexible heating coil (3), the temperature sensor (4), and the simulated magnetic field coil (5) are placed in a magnetic shielding unit (6), and the magnetic field control module (7), the temperature data acquisition module (8), the temperature control module (9), the magnetometer circuit acquisition control module (10), and the multifunctional host computer (11) are placed outside the magnetic shielding unit (6);

[0076] Step S2, the simulated magnetic field coil (5) provides a magnetic field signal B1 of a certain frequency, the atomic magnetometer (1) measures the remanence B0 of the central area of ​​the magnetic material layer (2), and transmits the information to the magnetometer circuit acquisition control module (8), and the information is displayed on the host computer (9) after processing;

[0077] Step S3, calculating the shielding coefficient of the magnetic material layer (2), and calculating the shielding coefficient of the magnetic material layer (2) from the magnetic field signal according to the shielding coefficient formula;

[0078] Step S4, the flexible heating coil (3) heats the magnetic material layer (2) to a specific temperature T1°C, the host computer (11) outputs an instruction to the temperature control module (9), controls the flexible heating coil (3) to heat the magnetic material layer (2), the temperature sensor (4) measures the inner surface temperature of the magnetic material layer (2), converts the temperature signal into an electrical signal and sends it to the temperature data acquisition module (8), the temperature data acquisition module (8) processes the electrical signal and transmits it to the temperature control module (9), and the temperature control module (9) controls the magnetic material layer (2) to be at a temperature of T1°C with a fluctuation of less than ±0.1°C;

[0079] Step S5, the atomic magnetometer (1) measures the magnetic noise. After the magnetic material layer (2) is heated to a specific temperature T1°C, the atomic magnetometer (1) measures the magnetic noise in the central area of ​​the magnetic material layer (2) and transmits the information to the magnetometer circuit acquisition control module (10). After the information is processed, it is displayed on the host computer (11). The host computer (11) performs Fourier transform on the time domain magnetic noise signal of the atomic magnetometer to obtain the magnetic noise δB of the magnetic material layer (2) at the frequency f1. mag (T1);

[0080] Step S6, calculate the material magnetic permeability at different temperatures using the magnetic permeability formula, and convert the measured magnetic noise δB mag Substitute (T1) and frequency f1 into the magnetic permeability formula to calculate the material permeability;

[0081] Step S7: analyzing the temperature stability of the material's magnetic permeability and calculating the temperature coefficient of the material's magnetic permeability.

[0082] Specific implementation scheme 5: In step S3, the shielding coefficient formula is expressed as:

[0083]

[0084] Wherein B1 is the simulated magnetic field coil (5) providing a magnetic field signal with a frequency of f1, and B0 is the atomic magnetometer (1) measuring the remanent magnetism of the central area of ​​the magnetic material layer (2).

[0085] Specific implementation scheme six: In step S6, the magnetic permeability formula is expressed as:

[0086]

[0087]

[0088] Where f1 is the frequency, G is the shape factor, k B is the Boltzmann constant, r is the radius of the cylindrical shell, S is the shielding coefficient, t is the thickness of the cylindrical shell, T1 is the temperature of the magnetic material layer (2), μ0 is the vacuum permeability, δB mag is the magnetic noise measured by the atomic magnetometer (1).

[0089] Specific implementation scheme seven: In step S7, the temperature coefficient of magnetic permeability is expressed as:

[0090]

[0091]

[0092] The larger the absolute value of the temperature coefficient, the worse the temperature stability of the magnetic permeability; the smaller the absolute value of the temperature coefficient, the better the temperature stability of the magnetic permeability.

[0093] Any content not described in detail in this specification is prior art known to those skilled in the art. It should be noted that the above description is intended to help those skilled in the art understand the present invention, but does not limit the scope of protection of the present invention. Any equivalent substitution, modification, improvement, and / or simplification of the above description that does not depart from the essence of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A material magnetic permeability temperature stability testing device based on atomic magnetometer, characterized in that: The invention comprises an atomic magnetometer (1), a magnetic material layer (2), a flexible heating coil (3), a temperature sensor (4), a simulated magnetic field coil (5), a magnetic shielding unit (6), a magnetic field control module (7), a temperature data acquisition module (8), a temperature control module (9), a magnetometer circuit acquisition control module (10) and a multifunctional host computer (11). The atomic magnetometer (1) is arranged in the central area of ​​the inner cavity of the magnetic material layer (2) and is connected to the magnetometer circuit acquisition control module (10). The flexible heating coil (3) is attached to the outer surface of the magnetic material layer (2) and is connected to the temperature control module (9). The temperature sensor (4) is placed The magnetic material layer (2) is connected to a temperature data acquisition module (8), the temperature data acquisition module (8) is connected to a temperature control module (9), the simulated magnetic field coil (5) is connected to a magnetic field control module (7), the temperature control module (9) and the magnetometer circuit acquisition control module (10) are respectively connected to a multifunctional host computer (11), the simulated magnetic field coil (5) provides a magnetic field signal of a certain frequency to calculate the shielding coefficient of the magnetic material layer (2), the atomic magnetometer (1) measures magnetic noise, and brings the magnetic noise into the relationship between the shielding coefficient and the magnetic permeability to calculate the material magnetic permeability at different temperatures, and analyzes the temperature stability of the material magnetic permeability; The expression of the magnetic permeability includes the following expression of the real part of the magnetic permeability μ'(T) and the imaginary part of the magnetic permeability μ"(T): Where f1 is the frequency, G is the shape factor, k B is the Boltzmann constant, r is the radius of the cylindrical shell, S is the shielding coefficient, t is the thickness of the cylindrical shell, T is the temperature, T1 is the temperature of the magnetic material layer (2), μ0 is the vacuum permeability, δB mag is the magnetic noise measured by the atomic magnetometer (1).

2. The material magnetic permeability temperature stability testing device based on atomic magnetometer according to claim 1, characterized in that: The temperature sensor is placed on the inner surface of the magnetic material layer, and the sensitivity of the atomic magnetometer (1) is lower than the magnetic noise δB of the magnetic material. mag , the magnetic material layer (2) is in the shape of a closed cylindrical shell with a finite length.

3. The material magnetic permeability temperature stability testing device based on atomic magnetometer according to claim 1, characterized in that: The heating power per square centimeter of the flexible heating coil (3) is greater than 0.4W, the temperature range of the heated magnetic material layer (2) is 35°C to 150°C, the temperature data acquisition module (8) uses a digital display instrument with an acquisition accuracy of less than 0.2%, the control accuracy of the temperature control module (9) is less than 0.1°C, and the temperature fluctuation of the magnetic material layer (2) is less than ±0.1°C.

4. The material magnetic permeability temperature stability testing device based on atomic magnetometer according to claim 1, characterized in that: The simulated magnetic field coil (5) provides a magnetic field signal of 1 nT to 10000 nT at a certain frequency.

5. The material magnetic permeability temperature stability testing device based on atomic magnetometer according to claim 1, characterized in that: The expression of the shielding coefficient is as follows: Wherein S is the shielding coefficient, B1 is the magnetic field signal with a frequency of f1 provided by the simulated magnetic field coil (5), and B0 is the remanent magnetism of the central area of ​​the magnetic material layer (2) measured by the atomic magnetometer (1).

6. The material magnetic permeability temperature stability testing device based on atomic magnetometer according to claim 1, characterized in that: The temperature stability of the material's magnetic permeability is determined by the magnetic permeability temperature coefficient expression, which includes the following magnetic permeability temperature coefficient real part α μ′ (f1) expression and imaginary part α of the temperature coefficient of magnetic permeability μ″ (f1) Expression: The larger the absolute value of the temperature coefficient, the worse the temperature stability of the magnetic permeability; the smaller the absolute value of the temperature coefficient, the better the temperature stability of the magnetic permeability.

7. A method for testing the temperature stability of material magnetic permeability based on an atomic magnetometer, characterized in that: The following steps are involved: Step S1, constructing a material magnetic permeability temperature stability testing device based on an atomic magnetometer as described in any one of claims 1 to 6; Step S2, the simulated magnetic field coil (5) provides a magnetic field signal B1 of a certain frequency, the atomic magnetometer (1) measures the remanence B0 of the central area of ​​the magnetic material layer (2), and transmits the information to the magnetometer circuit acquisition control module (10), and the information is displayed on the host computer (11) after processing; Step S3, calculating the shielding coefficient of the magnetic material layer (2), and calculating the shielding coefficient of the magnetic material layer (2) from the magnetic field signal according to the shielding coefficient formula; Step S4, the flexible heating coil (3) heats the magnetic material layer (2) to a temperature of T1°C, the host computer (11) outputs an instruction to the temperature control module (9), controls the flexible heating coil (3) to heat the magnetic material layer (2), the temperature sensor (4) measures the inner surface temperature of the magnetic material layer (2), converts the temperature signal into an electrical signal and sends it to the temperature data acquisition module (8), the temperature data acquisition module (8) processes the electrical signal and transmits it to the temperature control module (9), and the temperature control module (9) controls the magnetic material layer (2) to be at a temperature of T1°C with a fluctuation of less than ±0.1°C; In step S5, the atomic magnetometer (1) measures magnetic noise. After the magnetic material layer (2) is heated to T1°C, the atomic magnetometer (1) measures the magnetic noise in the central area of ​​the magnetic material layer (2) and transmits the information to the magnetometer circuit acquisition control module (10). After the information is processed, it is displayed on the host computer (11). The host computer (11) performs Fourier transform on the time domain magnetic noise signal of the atomic magnetometer to obtain the magnetic noise δB of the magnetic material layer (2) at the frequency f1. mag (T1); Step S6, calculate the material magnetic permeability at different temperatures using the magnetic permeability formula, and convert the measured magnetic noise δB mag Substitute (T1) and frequency f1 into the magnetic permeability formula to calculate the material permeability; Step S7: analyzing the temperature stability of the material's magnetic permeability and calculating the temperature coefficient of the material's magnetic permeability.

8. The method for testing the temperature stability of material magnetic permeability based on an atomic magnetometer according to claim 7, characterized in that: The shielding coefficient formula in step S3 is as follows: Wherein B1 is the simulated magnetic field coil (5) providing a magnetic field signal with a frequency of f1, and B0 is the atomic magnetometer (1) measuring the remanent magnetism of the central area of ​​the magnetic material layer (2); The magnetic permeability formula in step S6 is as follows: Where f1 is the frequency, G is the shape factor, k B is the Boltzmann constant, r is the radius of the cylindrical shell, S is the shielding coefficient, t is the thickness of the cylindrical shell, T1 is the temperature of the magnetic material layer (2), μ0 is the vacuum permeability, δB mag is the magnetic noise measured by the atomic magnetometer (1).

9. The method for testing material magnetic permeability temperature stability based on atomic magnetometer according to claim 7, characterized in that: The magnetic permeability temperature coefficient expression in step S7 is as follows: The larger the absolute value of the temperature coefficient, the worse the temperature stability of the magnetic permeability; the smaller the absolute value of the temperature coefficient, the better the temperature stability of the magnetic permeability.

Images