A SQUID based AC susceptometer for the investigation of large samples

被引：14

作者：

Pasquarelli, A

DelGratta, C

DellaPenna, S

DiLuzio, S

Pizzella, V

Romani, GL

机构：

[1] UNIV GABRIELE DANNUNZIO, IST FIS MED, I-66013 CHIETI, ITALY

[2] UNIV GABRIELE DANNUNZIO, IST TECNOL BIOMED AVANZATE, I-66013 CHIETI, ITALY

来源：

PHYSICS IN MEDICINE AND BIOLOGY | 1996年 / 41卷 / 11期

关键词：

D O I：

10.1088/0031-9155/41/11/020

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

We developed a SQUID based susceptometer with a large available magnetized volume for the investigation of large objects. The magnetizing field is generated by a pair of Helmoltz coils. To achieve a high signal-to-noise ratio, the susceptometer is operated in a lock-in mode with an AC magnetizing field. A negative feedback control allows the rejection of the applied field with a relative residual of 1 x 10(-7). The apparatus was tested with substances of known magnetic susceptibility. The overall sensitivity, stated in terms of the magnetic moment, is better than 7 x 10(-11) A m(2) for small samples.

引用

页码：2533 / 2539

页数：7

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