Highly sensitive measurement of moisture content using HTS-SQUID

Keiji Tsukada, Toshihiko Kiwa, Hideaki Tahara, Etsuro Miyake, Hironobu Yamada, Akira Tsukamoto, Akihiko Kandori

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

We developed a highly sensitive magnetic system for measuring moisture content using an HTS-SQUID sensor. The system consists mainly of an exposure coil, a Dewar flask containing HTS-SQUID immersed in liquid nitrogen, a cancellation coil, a lock-in amplifier, magnetically shielded box, and FLL circuit. The cancellation coil was used to eliminate the applied magnetic field at the sensor position, and then a cancellation ratio of more than -40 dB was obtained. By the high performance, the subject can be exposed to a powerful magnetic field strength in the order of μT, and a weak magnetic signal of less than tens of pT from the subject can be detected. Using a magnetic vector analysis technique, more precise measurement of moisture content is realized.

Original languageEnglish
Article number5075618
Pages (from-to)878-881
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume19
Issue number3
DOIs
Publication statusPublished - Jun 1 2009

Keywords

  • Diamagnetism
  • HTS-SQUID
  • Magnetic cancellation
  • Moisture content

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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