MIグラジオメータ用アクティブ磁気シールドの環境磁界低減効果

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2017/08/01

タイトル(英語): Environmental Magnetic Noise Reduction Effect of the Active Magnetic Shielding System for MI Gradiometer

著者名: 滝谷　貴史（名古屋大学），内山　剛（名古屋大学）

著者名(英語): Takashi Takiya (Nagoya Universty), Tsuyoshi Uchiyama (Nagoya Universty)

キーワード: MIセンサ，グラジオメータ，アクティブ磁気シールド，微小磁気計測　　MI sensor，gradiometer，active magnetic shielding system，very weak magnetic measurement

要約(英語): We have developed the active magnetic shielding system, which a reference-type MI element output is fed back to a sensor-head with a feedback coil, to reduce the environmental magnetic noise around the sensor-head. Output properties of MI elements could keep linearity by adjusting the DC magnetic field in the feedback coil to less than 1 μT. Furthermore, the noise at 60 Hz related to the power source line was reduced by 1/10 with this system. We have measured a variation of magnetic field with a stainless steel metal ball (SUS304, 0.3 mm diameter) movement by using a new MI gradiometer with this system, and the magnetic signal of 700 pT was detected clearly compared with a previous MI gradiometer. Consequently, we considered that this type MI gradiometer is an effective method of a very weak magnetic measurement in the environmental magnetic noise.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.137 No.8 （2017） 特集：磁気センサの高機能化と応用技術の新展開

本誌掲載ページ: 454-459 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/137/8/137_454/_article/-char/ja/