Measuring device and measuring method of superconductive AC magnetic susceptibility

Abstract

The invention discloses a measuring device and a measuring method of superconductive AC magnetic susceptibility, belonging to the field of superconducting electronics. The measuring method comprises the steps of: positioning a measured superconducting material between a primary coil and a secondary coil, and fixing the elements in a sealed vacuum chamber, refrigerating the measured superconducting material via a compression refrigeration machine, extracting a voltage signal induced by the secondary coil through a phase-locking amplifier, and simultaneously providing AC voltage excitation to the primary coil through the phase-locking amplifier, measuring the temperature of the measured superconducting material through a temperature controller, storing the voltage signal measured by the phase-locking amplifier and a temperature signal measured by the temperature controller in a computer, and displaying the temperatiredependent curve of the voltage signal measured by the phase-locking amplifier in real time. The measuring method of the invention has the advantages of performing a nondestructive measurement on the conversion temperature of the superconducting material to conveniently master the measurement condition in time, and the measuring method is an efficient, accurate and reliable measurement manner, so that the measuring method has certain practical value for detecting the performance of the superconducting material.

Description

technical field [0001] The invention relates to the field of superconducting electronics, specifically, a measuring device and a measuring method for non-destructively measuring the transition temperature of superconducting materials. Background technique [0002] The development of superconducting material preparation technology has been relatively mature at present, and the indicators for judging their performance include critical temperature Tc, critical current characteristic Jc, and superconducting surface microwave resistance Rc, etc. Superconducting critical temperature Tc and critical current Jc are measures of superconducting The main indicators of the performance of thin film samples, high superconducting transition temperature point and large critical current Jc are the prerequisites for the large-scale application of superconducting materials and superconducting technology. [0003] At present, there are two main methods for measuring the superconducting transiti...

AI Technical Summary

Problems solved by technology

This method uses the method of moving the sample rack to change the position of the sample rack and the superconducting material sample to be tested on it to obtain different temperature zones. The whole process needs to move the sample rack continuously. Due to the uncertainty of artificial movement, it will cause During a certain moving process, the amplitude of the sample rod measuring frame is too large, which causes the temperature of the superconducting sample on it to change too fast, which puts forward stricter requirements for the acquisition and processing system, and more points need to be collected in a certain process. In order to ensure that the slight changes of the measured parameters are not missed, the temperature changes too fast to increase the temperature hysteresis effect and cause temperature measurement errors

In addition, it is more expensive to measure with liquid helium

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