Alternating-current magnetic susceptibility measuring device and method
An AC magnetic susceptibility and measuring device technology, which is applied in the fields of material science, high voltage science and technology, condensed matter physics, and superconducting electronics, and can solve the problem that the impedance of the excitation coil cannot be measured, and the measurement resolution of the magnetic susceptibility signal decreases. and other problems, to achieve the effect of increasing the minimum temperature, improving the resolution, and improving the accuracy
Inactive Publication Date: 2019-12-17
北京飞斯科科技有限公司
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[0006] In order to solve the deficiencies in the prior art, this application proposes an AC magnetic susceptibility measurement device and method, mainly to solve the traditional AC magnetic susceptibility test process, when the constant voltage excitation mode is used, the excitation coil impedance changes due to temperature changes, and further The problem that the measurement resolution of the magnetic susceptibility signal of the measured material is reduced or cannot be measured
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[0050] The application will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, but not to limit the protection scope of the present application.
[0051] This application is an AC magnetic susceptibility measuring device, and the overall structure of the implementing device is as follows figure 1 As shown, it includes an AC current source 3, a temperature controller 4, a vacuum pump 6, a cryostat 7, and a coil group 8;
[0052] The vacuum pump 6 is connected to the cryostat 7, the cryostat 7 is connected to the temperature controller 4, and the AC current source 3 is connected to the coil group 8;
[0053] The alternating current source 3 provides an alternating current signal for the coil group 8;
[0054] The temperature controller 4 is used to monitor and control the temperature of the sample to be tested and the coil group 8;
[0055] ...
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The invention discloses an alternating current magnetic susceptibility testing device and method. The device comprises an alternating current source, a temperature controller, a vacuum pump, a low-temperature thermostat and a coil assembly, and the device further comprises a pre-amplifier, a lock-in amplifier and a program control computer. Current excitation is adopted, and a solid or powder material to be tested is placed in a pickup coil, and then the material to be tested and the pickup coil are placed in a sample cavity of the low-temperature thermostat; an alternating current signal is provided for an excitation coil through a constant current source, the lock-in amplifier extracts a test signal of a pickup coil, the temperature of a to-be-tested sample is obtained through the high-precision temperature controller, and then a computer displays a curve in which a measurement signal changes along with the temperature in real time. The invention relates to the lossless alternating current magnetic susceptibility measurement method, and the problems, such as that the magnetic susceptibility signal measurement resolution of the measured material is further reduced and even a result cannot be obtained due to the fact that a constant-voltage excitation mode is adopted and the impedance of the excitation coil is changed due to temperature change, generated in the traditional alternating current magnetic susceptibility test process are overcome.
Description
technical field [0001] The invention relates to the technical fields of superconducting electronics, material science, high-voltage science and technology, and condensed matter physics, and in particular to an AC magnetic susceptibility measuring device and method. Background technique [0002] The measurement of AC magnetic susceptibility for the study of magnetic materials began in the 1930s, especially for materials with ferromagnetic, antiferromagnetic and superconductive transitions. This method has gradually been valued because the magnetic susceptibility and Frequency-related, further information on time constants related to magnetodynamics can be obtained. For example, AC susceptibility can be used to study the pinning energy in superconducting materials, the magnetic relaxation time constant, the relaxation process that determines the energy exchange between spin-lattice vibrations, and the self Spin-spin relaxation process, cross-relaxation process of different sp...
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IPC IPC(8): G01R33/16
CPCG01R33/16
Inventor 冯长沙黄社松王凡杨威
Owner 北京飞斯科科技有限公司