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本文介绍了一种利用电磁感应原理和超导磁效应,在小型制冷机中测量超导体转变温度的装置.本装置包括密闭的真空室、压缩制冷机、真空泵、真空计、锁相放大器、温控仪、计算机、线圈绕组.其中,线圈绕组置于真空室内,由初级线圈和次级线圈组成,初级线圈和次级线圈分别绕制在两个线圈骨架上;被测超导薄片材料放置于初级线圈和次级线圈之间;压缩制冷机用来为超导材料制冷;真空泵用来对真空室抽真空;温控仪用来测量和控制真空室内的温度;锁相放大器为初级线圈提供交流电压信号,并测量次级线圈的电信号以得到交流磁化率值;计算机记录温控仪测得的温度数据和锁相放大器测得的次级线圈的电压信号,并显示锁相放大器测得的次级线圈的电压信号随温度变化的曲线.实验证明该装置可以通过测量超导体交流磁化率的变化测得超导转变温度,具有自动化测量及测试成本低等特点.
This paper introduces a device for measuring the transition temperature of superconductors in a small refrigerator by using the principle of electromagnetic induction and superconducting magnetic effect.The device includes a closed vacuum chamber, a compression refrigerator, a vacuum pump, a vacuum gauge, a lock-in amplifier, a temperature control Wherein the coil winding is arranged in the vacuum chamber and is composed of a primary coil and a secondary coil, the primary coil and the secondary coil are respectively wound on two coil bobbins; the measured superconducting sheet material is placed on a primary Coil and secondary coil; Compressor used to cool the superconducting material; Vacuum pump used to vacuum the vacuum chamber; Temperature controller used to measure and control the temperature inside the vacuum chamber; Lock-in amplifier for the primary coil to provide AC voltage Signal and measure the electrical signal of the secondary coil to obtain AC susceptibility values; the computer records the temperature data measured by the temperature controller and the voltage signal of the secondary coil measured by the lock-in amplifier, and displays the measured times of the lock-in amplifier Level coil voltage signal with temperature curve.The experiment shows that the device can measure the superconducting magnetic susceptibility change of the superconducting transition temperature, Moving measurement and testing costs low and so on.