2005 Fiscal Year Final Research Report Summary
High sensitive magnetic field sensing system for measurement of bio-magnetic signal at room temperature
| Project/Area Number |
16206041
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Measurement engineering
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| Research Institution | Tohoku University |
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Principal Investigator |
ARAI Ken ichi Tohoku University, Research Institution of Electrical Communication, Professor, 電気通信研究所, 教授 (40006268)
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| Co-Investigator(Kenkyū-buntansha) |
ISHIYAMA Kazushi Tohoku University, Research Institution of Electrical Communication, Associate Professor, 電気通信研究所, 助教授 (20203036)
YABUKAMI Shin Tohoku University, Research Institution of Electrical Communication, Research Associate, 電気通信研究所, 助手 (00302232)
IMAE Michito Tohoku University, Advanced Industrial Science and Technology, Chief Researcher, 主任研究員 (90359034)
HANADO Yuko National Institute of Information and Communications Technology, Chief Researcher, 主任研究員 (10359036)
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| Project Period (FY) |
2004 – 2005
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| Keywords | high frequency carrier type sensor / high sensitive / bio-magnetic signal |
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| Research Abstract |
A highly sensitive magnetic field sensor operating at room temperature shows promise for non-destructive, biomagnetic measurement (such as MCG or MEG). High frequency carrier type sensors have potential for high sensitivity, as in SQUID (Superconducting Quantum Interference Devices). In the present study we developed a very sensitive high-frequency carrier-type magnetic field sensor with a sub-pT resolution using a resonating transmission line-type sensor element since high impedance change can be obtained with such a sensor. The CoNbZr film was deposited by RF sputtering, and a low anisotropy field of 0.8 Oe was applied by annealing. The CoNbZr film thickness of 4 micro m was found to be the optimum value by which to obtain the highest impedance change (dZ/dH). Carrier current flows in the Cu meander pattern, not in CoNbZr film, so the sensor is different from conventional GMI senors in that point. A small AC magnetic field was applied to the sensor element and a very small AM signal was detected using a carrier suppressing circuit. The experiments were carried out in a magnetically shielded room. A resolution of 0.7pT per square root Hz was obtained at 501kHz. The detectable magnetic field was limited by the chaotic noise caused by nonlinear magnetic excitation. A resolution of about 2pT per squire root Hz was obtained at 1kHz and a resolution of about 80pT per square root Hz was obtained at 45Hz.
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[Patent(Industrial Property Rights)] 特許2006
Inventor(s)
薮上 信, 荒井賢一, 石山和志, 小澤哲也, 村山芳隆
Industrial Property Rights Holder
科学技術振興事業団
Industrial Property Number
特癌2006-62002
Filing Date
2006-03-08
Description
「研究成果報告書概要(和文)」より
