A SQUID series array dc current sensor

被引：16

作者：

Beyer, J. ^{[1
]}

Drung, D. ^{[1
]}

机构：

[1] Phys Tech Bundesanstalt, D-10587 Berlin, Germany

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2008年 / 21卷 / 09期

关键词：

D O I：

10.1088/0953-2048/21/9/095012

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Superconducting quantum interference device (SQUID) sensors are used to sense changes in various physical quantities, which can be transformed into changes in the magnetic flux threading the SQUID loop. We have developed a novel SQUID array dc current sensor. The device is based on a series array of identical dc SQUIDs. An input signal current to be measured is coupled tightly but non-uniformly to the SQUID array elements. The input signal coupling to the individual array elements is chosen such that a single-valued, non-periodic overall voltage response is obtained. Flux offsets in the individual SQUIDs which would compromise the sensor voltage response are avoided or can be compensated. We present simulations and experimental results on the SQUID Array for Dc (SQUAD) current sensor current sensor performance. A dc current resolution of < 1 nA in a measurement bandwidth of 0-25 Hz is achieved for an input inductance of L(In) < 3 nH.

引用

页数：6

共 8 条

[1] An absolute magnetometer based on dc Superconducting QUantum Interference Devices [J].