Device for measuring electric current density of superconductor with Campbell method

Abstract

The invention discloses a device for measuring the electric current density of a superconductor with the Campbell method. According to the technical scheme, the device for measuring the electric current density of the superconductor with the Campbell method is mainly formed by a detection device and an output signal processing and storage device. The detection device comprises a detection coil and a reference coil. The output signal processing and storage device comprises a tuning circuit, a voltmeter and a computer, the computer is provided with an auxiliary measuring and control system and used for recording and analyzing data, and electric signals formed in the detection coil and the reference coil are tuned through the external tuning circuit to be sent to the voltmeter and the computer. According to the device, flux changes in the coils are represented through the voltage, the magnetic field penetration depth of the superconductor is accordingly determined, the slope of the relation between the magnetic field penetration depth and the magnetic induction intensity is solved to obtain the superconductivity critical current density, effective signals generated by a sample are detected through the two coils, the accuracy and the reliability are achieved, and the Campbell magnetic measurement current theory is achieved through an enforceable measurement tool.

Description

technical field [0001] The invention relates to the technical field of superconductivity measurement, in particular to a device for measuring the current density of a superconductor by a Campbell method. Background technique [0002] The study of superconductivity is a developing subject, and it is not yet mature in the field of characteristic research and performance measurement of superconducting materials. The critical current characteristic is one of the basic characteristics of superconducting materials, and the law of critical current is an important aspect of superconducting applications. Parameters are also the main technical indicators to measure the quality of superconducting materials. Studying their measurement methods can not only further study the characteristics of the materials themselves, but also serve the application and development of superconducting materials. For example, the main body of high-temperature superconducting cable power transmission is high...

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Problems solved by technology

Therefore, being able to accurately measure the relationship between the penetration depth of the magnetic field and the changing magnetic field has become the key to the Campbell method. At present, a few foreign research groups are engaged in the research of this measurement method, and domestic research is still in the initial stage.

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