A DRUNG-TYPE MAGNETOMETER MOUNTED ON A GM CRYOCOOLER

被引：6

作者：

KAZAMI, K ^{[1
]}

TAKADA, Y ^{[1
]}

FUJIMOTO, S ^{[1
]}

YOSHIDA, T ^{[1
]}

OGATA, H ^{[1
]}

KADO, H ^{[1
]}

机构：

[1] ELECTROTECH LAB,TSUKUBA 305,JAPAN

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 1994年 / 7卷 / 05期

关键词：

D O I：

10.1088/0953-2048/7/5/007

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We developed a compact, light, highly reliable biomagnetic measurement system which uses Drung-type SQUIDS and a Gifford-McMahon (GM) cycle cryocooler. The GM cryocooler, containing erbium-3 nickel (Er3Ni) as a magnetic regenerative material, cooled the SQUID to 5.1 K without a Joule-Thomson (JT) circuit. The intensity of the magnetic noise was about 30-40 pTpp in the SQUID cooling stage when evaluated in a magnetically shielded room. This noise was eliminated by applying a 'template' noise reduction technique. Magnetocardiogram (MCG) and magnetoencephalogram (MEG) measurements were demonstrated with this new system.

引用

页码：256 / 259

页数：4