AN AUTOMATIC AC BRIDGE FOR MEASURING MAGNETIC-SUSCEPTIBILITY AT LOW-TEMPERATURES

被引：0
|
作者：
LAPSHIN, DA [1 ]
POZIGUN, SA [1 ]
机构：
[1] MOSCOW MV LOMONOSOV STATE UNIV,MOSCOW,RUSSIA
来源：
INSTRUMENTS AND EXPERIMENTAL TECHNIQUES | 1995年 / 38卷 / 02期
关键词：
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
An automatic ac bridge for measuring magnetic susceptibility chi = chi' + j chi '' is described. An imbalance signal is compensated using a separate coil inductively coupled to the pickup coil. The generation of current in the compensating coil for both in-phase and quadrature components is controlled by a digital integrating feedback circuit built around a voltage-to-frequeney converter. The sensitivity Limit of the bridge is 3 . 10(-8) CGSM units. The operating frequency band is 20 Hz-10 kHz. The modulating field amplitude reaches 15 Oe. The temperature stabilization system operates in a range of 4.2 to 250 degrees K. Typical measurements are presented.
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页码：253 / 260
页数：8
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