高温超导体临界电流密度脉冲法测试系统研究

Critical Current Measuring System of High Tc Superconductor

设计了高温超导体临界电流密度的脉冲法测量系统；进行了脉冲电流发生电路和样品电压信号测量放大器的调试。样品上的脉冲电流和电压信号采用微机和HY－6020A／D板实现数据的高速采集。脉冲时间可在50ms内调节，脉冲电流线形很好，幅值达到了100A。

A critical current density measuring system of high Tc superconductors using pulse technology was designed. A pulse current source and a UV - scale amplifier was adjusted. The pulse current and voltage in samples were collected at a high frequency (15KHz)by micro-computer and HY - 6020A/D, D/A board. The pulse time can be regulated in 50ms. The pulse current was linear and its can be up to 100A. The measurement of sintered YBCO sam-ple indicted that its Jc was 25A/cm2(77K, OT)where 10μV voltage criterion applied to esti-mate the critical current.