Two-Dimensional Gradiometer

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概要

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• We developed a two-dimensional gradiometer that detects the gradient of a magnetic field in two orthogonal directions to measure the biomagnetic signal in an unshielded environment. We based the gradiometer on a low-$T_{\text{c}}$ superconducting quantum interference device (SQUID) and wire-wound pickup coil. The gradiometer we developed detects both the axial-second-order and planar-first-order gradient of a magnetic field. The experimental results revealed that its noise-reduction ratio (NRR) was 54 dB from 0.5 to 49 Hz and 14 dB (5 times) larger than that of the axial-second-order gradiometer. Moreover, by using the new gradiometer, we obtained a clear magnetocardiography (MCG) waveform in real time without averaging under an unshielded environment (noise level: 3.8 nT/$\sqrt{\text{Hz}}$ at 1 Hz; 150 pT/$\sqrt{\text{Hz}}$ at 10 Hz).

• 2007-06-15

著者

• Kandori Akihiko

  Advanced Research Laboratory Hitachi Ltd

• Kandori Akihiko

  Advanced Research Laboratory, Hitachi, Ltd., 1-280 Higashi-Koigakubo, Kokubunji, Tokyo 185-8601, Japan

• Seki Yusuke

  Advanced Research Laboratory, Hitachi, Ltd., 1-280 Higashi-Koigakubo, Kokubunji, Tokyo 185-8601, Japan

関連論文

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• Liquid-Phase Detection of Biological Targets with Magnetic Marker and Superconducting Quantum Interference Device
• Design of Pickup Coil Made of Litz Wire and Cooled at 77 K for High Sensitive Measurement of AC Magnetic Fields
• Optimized Condition for Buffer Gas in Optical-Pumped Magnetometer Operated at Room Temperature
• An Increase in Right Atrial Magnetic Strength Is a Novel Predictor of Recurrence of Atrial Fibrillation After Radiofrequency Catheter Ablation
• Two-Dimensional Gradiometer

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