VARIABLE FREQUENCY 2-PHASE AC SUSCEPTOMETER FOR USE IN DC BIAS FIELDS OVER THE TEMPERATURE-RANGE OF 4.2-K TO 300-K

被引：5

作者：

KOSZEGI, L ^{[1
]}

FOLDEAKI, M ^{[1
]}

DUNLAP, RA ^{[1
]}

机构：

[1] DALHOUSIE UNIV,DEPT PHYS,HALIFAX B3H 4H2,NS,CANADA

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 1991年 / 62卷 / 03期

关键词：

D O I：

10.1063/1.1142086

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A system has been designed and constructed in order to detect differential ac susceptibility as a function of temperature between 4.2 and 300 K. A dc bias field in the range of 0-50 kOe is provided by a superconducting magnet. The available ac field range is 0-1 Oe. Using the reference source of a PAR lock-in amplifier, the measurements can be carried out in a frequency range of 0.1-10 kHz. A differential amplifier circuit is used to accurately detect the susceptibility signal. As this provides both in-phase and out-of-phase compensating signals, both the real and imaginary components of the susceptibility can be detected even when using a single-phase lock-in amplifier. The circuit diagram and principle of operation as well as the calibration procedure and data processing methods are described in detail.

引用

页码：793 / 796

页数：4