A MODULAR LOW-NOISE 7-CHANNEL SQUID-MAGNETOMETER

被引：36

作者：

DOSSEL, O

DAVID, B

FUCHS, M

KULLMANN, WH

LUDEKE, KM

机构：

[1] Philips GmbH, Forschungslaboratorium Hamburg, Postfach, 54 08 40

来源：

IEEE TRANSACTIONS ON MAGNETICS | 1991年 / 27卷 / 02期

关键词：

D O I：

10.1109/20.133790

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A modular low noise 7-channel SQUID-magnetometer for biomagnetic measurements was developed. The DC-SQUIDs are prepared by thin film technology based on the materials NbN-MgO-NbN and show a flux noise below 10-mu-PHI-o/square-root Hz. The signal is picked up with first order wirewound gradiometers of 2cm diameter and coupled to the SQUIDs by integrated coupling coils. Individual channels can be replaced from the system and various gradiometers can be used giving a flexible modular system. The electronics are based on the flux locked loop method extended by a new bias modulation technique to reduce 1/f noise. The overall system noise is below 20fT/square-root Hz. Biomagnetic measurements on auditory evoked fields have been carried out.

引用

页码：2797 / 2800

页数：4

共 13 条

[1] A NOVEL MODULATION TECHNIQUE FOR 1/F NOISE-REDUCTION IN DC SQUIDS [J].