Japan Geoscience Union Meeting 2016

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Oral

Symbol S (Solid Earth Sciences) » S-EM Earth's Electromagnetism

[S-EM34] Geomagnetism, paleomagnetism and rock magnetism

Tue. May 24, 2016 3:30 PM - 5:00 PM Convention Hall A (2F)

Convener:*Masaki Matsushima(Department of Earth and Planetary Sciences, Graduate School of Science and Engineering, Tokyo Institute of Technology), Yusuke Suganuma(National institute of Polar Research), Chair:Hiroyuki Hoshi(Department of Earth Sciences, Aichi University of Education), Hirokuni Oda(Institute of Geology and Geoinformation, Geological Survey of Japan, AIST)

3:30 PM - 3:45 PM

[SEM34-13] Improvements in Signal-to-Noise Ratio for SQUID microscope

*Hirokuni Oda1, Masahiko Sato1, Atushi Noguchi3,1, Hironori Takahashi4,1, Jun Kawai2, Masakazu Miyamoto2 (1.Institute of Geology and Geoinformation, Geological Survey of Japan, AIST, 2.Kanazawa Institute of Technology, 3.Kochi University, 4.Ibaraki University)

Keywords:scanning SQUID microscope, noise, magnetic shielding, signal-to-noise ratio, calibration

We have been developing scanning SQUID (superconducting quantum interference device) microscope for geological samples. In this presentation, we will demonstrate improvements in our scanning SQUID microscope system. We introduce external magnetic shielding by thin shield film outside of a double-layered PC permalloy magnetic shield box surrounding scanning SQUID microscope. We also develop internal magnetic shield just outside of scanning SQUID microscope with five layered shield film for AC and DC shielding. With this set-up, we also introduce a reference SQUID sensor inside liquid helium dewar in order to compensate noise originated from environmental magnetic field. Resulting signal-to-noise ratio is going to be analyzed and reported. In addition, we show a calibration procedure for our scanning SQUID microscope in terms of its sensitivity and deviation from vertical axis.