Progress in Superconductivity

The Korean Superconductivity Society (한국초전도학회)
권호 표지

Detection of a Moving Object by Multi-channel SQUID Magnetometer System

다중채널 고온초전도 양자간섭소자 자력계 시스템을 이용한 이동 물체 탐지

  • Lee, H.J. (LG Electronics Institute of Technology) ;
  • Lee, S.-M. (LG Electronics Institute of Technology) ;
  • Lee, H.N. (LG Electronics Institute of Technology) ;
  • Yun, J.H. (LG Electronics Institute of Technology) ;
  • Moon, S.H.Lim, S.H.Kim, D.Y.Oh, B. (LG Electronics Institute of TechnologyLG InnotekLG InnotekLG Electronics Institute of Technology)
  • 이헌주 ;
  • 이승민 ;
  • 이호년 ;
  • 윤주환 ;
  • 문승현임선호김덕영오병두
  • Published : 2001.01.01
Download PDF
⟨ Previous Next ⟩

Abstract

We have constructed a multi-channel SQUID magnetometer system for localization and classification of magnetic targets. Ten SQUID magnetometers were arranged to measure 5 independent components of 3 $\times$ 3 magnetic field gradient tensor. To get gradient from the difference of magnetic field measurements, we carefully balanced magnetometers. SQUIDs with slotted washer were used for operation in an unshielded laboratory environment, and noise characteristic in the laboratory was measured. With the multi-channel SQUID magnetometer system, we have successfully traced the motion of a bar magnet moving around it at a distance of about 1 m. In the urban environment, the drift of uniform magnetic field due to the irregular motion of a large magnetic body at distance and earth field causes an error in the position calculation, and this results in the distortion of the calculated trajectory. In this paper, we present the architecture and the performance of the system.

Keywords