一种高温超导材料临界电流密度测试的方法
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摘要
临界电流密度(J_c)是超导材料的重要特征参数之一,精确的测量临界电流密度对研究超导材料特性及超导器件稳定性具有重要意义.本文介绍了一种基于经典电磁感应理论和超导技术理论测量YBCO超导薄膜临界电流密度的方法和测试装置.研究显示,在液氮环境下,将超导薄膜加入初级线圈和次级线圈中间会明显影响次级线圈的接收效果.我们根据此测量方法搭建了一种测量YBCO薄膜临界电流密度的实验装置.在分析实验测量误差后,通过实验的对比,得到了加入超导薄膜对次级线圈的感应电压的影响,并分析感应电压与线圈互感之间的关系,从而算出超导薄膜的临界电流密度.实验通过噪声抑制和数据校正,准确地测量了超导薄膜的临界电流密度.
The critical current density(J_c)is one of the main research contents of superconducting materials.The accurate critical current density is of great importance to the properties of superconducting materials and the stability of superconducting devices.In this paper,a nondestructive inductive measuring device based on electromagnetic induction and superconductivity for Jc determination in high temperature superconducting films was introduced.Research shows that the addition of high temperature superconducting films can significantly affect the reception of the receiving coil in a liquid nitrogen environment.A system measuring the critical current density of high temperature superconducting films was built.After analyzing the experimental measurement error,the influence of high temperature superconducting films on the induced voltage of the receiving coil is obtained through the comparison of experiments.And The critical current density of high temperature superconducting films is calculated from the relationship between the induced voltage and the mutual inductance of the coil.Noise suppression and data correction were taken for accurate measurements of the weak output signal as well.The results were compared with traditional measurement method,The critical current density of high temperature superconducting films is accurately measured.
The critical current density(J_c)is one of the main research contents of superconducting materials.The accurate critical current density is of great importance to the properties of superconducting materials and the stability of superconducting devices.In this paper,a nondestructive inductive measuring device based on electromagnetic induction and superconductivity for Jc determination in high temperature superconducting films was introduced.Research shows that the addition of high temperature superconducting films can significantly affect the reception of the receiving coil in a liquid nitrogen environment.A system measuring the critical current density of high temperature superconducting films was built.After analyzing the experimental measurement error,the influence of high temperature superconducting films on the induced voltage of the receiving coil is obtained through the comparison of experiments.And The critical current density of high temperature superconducting films is calculated from the relationship between the induced voltage and the mutual inductance of the coil.Noise suppression and data correction were taken for accurate measurements of the weak output signal as well.The results were compared with traditional measurement method,The critical current density of high temperature superconducting films is accurately measured.
引文
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[2]李春光,王旭,王佳,孙亮,何豫生,科学通报62(2017),4010.
[3]Nakamura T,Itoh Y,Yoshikawa M,OkaT,Uzawa J.Concepts in Magnetic Resonance Part B Magnetic Resonance Engineering,31(2010),65.
[4]Claassen J H,Reeves M E,SoulenJr R J.Review of Scientific Instruments62(1991)996.
[5]Mawatari Y,Yamasaki H,Nakaga-wa Y.Applied Physics Letters 81(2002),2424.
[6]Yamasaki H,Mawatari Y,Nakaga-wa Y.Applied Physics Letters 82(2003),3275.
[7]Hosseini N,Kananian S,Zabetian A,F-ardmanesh M.Physics Procedia 36(2012),655.
[8]向裕民,重庆大学学报(自然科学版)20(1997)51.
[9]Piri M,Jaros V,Frivaldsky M.International Scientific Conference on Electric Power Engineering IEEE2015 712.
[10]胡绍宗,大学数学29(2013),111.
[11]Smith J A,Cima M J,Sonnenberg N.Applied Superconductivity IEEE Transactions on 9(1999),1531.
[12]Li CS,Sun Y C,Zhao W P,Chinese Journal of Electron Devices 29(2006),1078.