Development of a light-weight, high-performance magnetic shielding system for MEG measurements
开发用于 MEG 测量的轻质高性能磁屏蔽系统
基本信息
- 批准号:12355018
- 负责人:
- 金额:$ 17.28万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (A)
- 财政年份:2000
- 资助国家:日本
- 起止时间:2000 至 2002
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The main objectives of this three-year research are to apply a light-weight, high-performance magnetic shield of open-ended cylindrical structure (height=2.76 m, outer diameter=0.98 m and inner diameter=0.67 m), which was built by our own design using Co-based amorphous magnetic tapes and applying magnetic shaking technique, for the MEG measurements with first-order dc-SQUID gradiometers, and to study which parts of shielding system should be improved for the MEG measurement to be done. We have succeeded in measuring MEG alpha rhythm from a human brain of 23-year old male volunteer, however, we found magnetic noise inside the shield should be further improved for the measurement of evoked MEG. Other important results and future problems are summarized below :- Conductive cloth RF shield enclosing the magnetic shield was found to be successful to recover flux-voltage (φ-v) characteristics of dc-SQUID to the level of no RF interference.- Low frequency magnetic fluctuation noise is observed during magnetic shaking, which was found to be in strong relation to the Barkhousen magnetic noise. Metglas 2714A amorphous magnetic tape exhibits much smaller fluctuation noise than Metglas 2705M one.- Active compensation for openings of the cylindrical magnetic shell has been established for the helical shell and for the axial shell. 55 times improvement was obtained at 2 Hz of uniformly impressed magnetic field and 20 times at 10 Hz and 5 times at 50 Hz.- Stable fluxgate magnetometer was developed by incorporating bias reversal technique to the orthogonal structure.- A simple coil system for producing uniform magnetic field was proposed for active magnetic shields-Further magnetic noise cleaning should be needed, which can be realized by taking account of the second and the third-results in the design of the shield.
这项为期三年的研究的主要目标是将我们自行设计的采用钴基非晶磁带并应用磁振荡技术构建的开放式圆柱形结构(高度=2.76 m,外径=0.98 m,内径=0.67 m)的轻质高性能磁屏蔽用于一阶dc-SQUID梯度计的MEG测量,并研究其中的哪些部分 应改进屏蔽系统以进行 MEG 测量。我们已经成功测量了 23 岁男性志愿者大脑的 MEG α 节律,但是,我们发现屏蔽内的磁噪声还需要进一步改进以测量诱发的 MEG。其他重要结果和未来的问题总结如下:-发现包围磁屏蔽的导电布射频屏蔽成功地将dc-SQUID的磁通电压(φ-v)特性恢复到无射频干扰的水平。-在磁振动过程中观察到低频磁波动噪声,发现这与巴克豪森磁噪声密切相关。 Metglas 2714A 非晶磁带的波动噪声比 Metglas 2705M 磁带小得多。 - 为螺旋壳和轴向壳建立了圆柱形磁壳开口的主动补偿。在 2 Hz 均匀外加磁场下获得了 55 倍的改进,在 10 Hz 下获得了 20 倍,在 50 Hz 下获得了 5 倍。 - 通过将偏置反转技术融入正交结构,开发了稳定的磁通门磁力计。 - 提出了一种用于有源磁屏蔽产生均匀磁场的简单线圈系统 - 需要进一步的磁噪声清除,这可以通过考虑第二个和第三个结果来实现。 盾牌的设计。
项目成果
期刊论文数量(43)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
E.Paperno, I.Sasada, K.Tashiro: "Experimental correction of the axial.shielding equation"IEEE Trans. Magn.. Vol.38,No.5. 3324-3326 (2002)
E.Paperno、I.Sasada、K.Tashiro:“轴向屏蔽方程的实验校正”IEEE Trans。
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田代晋久, 笹田一郎, 吉富邦明, 風見邦夫: "小型アンテナによる磁気シールド内のRFノイズ測定-dc-SQUIDセンサに与える影響-"日本応用磁気学会誌. 26巻4号. 535-538 (2002)
Nobuhisa Tashiro、Ichiro Sasada、Kuniaki Yoshitomi、Kunio Kazami:“使用小型天线测量磁屏蔽中的 RF 噪声 - 对 DC-SQUID 传感器的影响 -”日本应用磁学学会杂志,第 26 卷,第 4. 535 期。 -538 (2002))
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K.Tashiro, H.Koide, Y.Umeda, I.Sasada: "New Method of Canceling Line Spectrum Noise in a Magnetic Shield by Using the Beat Phenomenon"Trans.Magn.Soc.Japan. Vol.25, No.4-2. 1119-1122 (2001)
K.Tashiro、H.Koide、Y.Umeda、I.Sasada:“利用节拍现象消除磁屏蔽中线谱噪声的新方法”Trans.Magn.Soc.Japan。
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T.Sasada, E.Paperno: "Magnetic sensors and Magnetometer, P.Ripka (Ed.), "Magnetic shielding"(分担)"Artech House, Boston and London. 410-424 (2001)
T.Sasada、E.Paperno:“磁传感器和磁力计,P.Ripka(编辑),“磁屏蔽””Artech House,波士顿和伦敦 410-424 (2001)。
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K.Tashiro, K.Nagashima, A.Sumita T.Fukunaga, and I.Sasada: "Spontaneous magnetoencephaligraphy alpha rhythm measurement in a cylindrical magnetic shield employing magnetic shaking"J. Applied Physics. Vol.93, No.10. 6733-6735 (2003)
K.Tashiro、K.Nagashima、A.Sumita T.Fukunaga 和 I.Sasada:“利用磁力振动在圆柱形磁屏蔽中进行自发脑磁图 α 节律测量”J。
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SASADA Ichiro其他文献
SASADA Ichiro的其他文献
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{{ truncateString('SASADA Ichiro', 18)}}的其他基金
Development of high-performance active magnetic shield for bio-magnetic applications
开发用于生物磁应用的高性能主动磁屏蔽
- 批准号:
22246055 - 财政年份:2010
- 资助金额:
$ 17.28万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Development of a new active magnetic shield consisting of a pair of light-weight separate magnetic shells and its application to the bio-magnetic field measurement
一对轻质分离磁壳新型主动磁屏蔽的研制及其在生物磁场测量中的应用
- 批准号:
19206045 - 财政年份:2007
- 资助金额:
$ 17.28万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Measurements and analysis of magnetic noises arising from the second-stage pulse-tube refrigerator for the development of liquid helium less LTS-SQUID biomagnetic fields measurement system
用于开发无液氦LTS-SQUID生物磁场测量系统的第二级脉冲管制冷机产生的磁噪声的测量和分析
- 批准号:
15206048 - 财政年份:2003
- 资助金额:
$ 17.28万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Basic study on a Self-tuning method for obtaining highly stable, general-purpose shaft torque sensors
获得高稳定通用轴扭矩传感器的自整定方法的基础研究
- 批准号:
10450160 - 财政年份:1998
- 资助金额:
$ 17.28万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Development of a large-scale vertical setting cylindrical magnetic shield - Realization of low-level, low-gradient magnetic field with current superposition
大型立式圆筒磁屏蔽研制——电流叠加实现低水平低梯度磁场
- 批准号:
09555129 - 财政年份:1997
- 资助金额:
$ 17.28万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Design consideration on the torque sensor for intelligent mechanical systems
智能机械系统扭矩传感器的设计考虑
- 批准号:
07455173 - 财政年份:1995
- 资助金额:
$ 17.28万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Development of a measuring system for low-frequency, extremely low-level magnetic field-Introduction of high-performance magnetic shield and a adaptive vibratory noise cancelling mechanism
开发低频极低磁场测量系统-引入高性能磁屏蔽和自适应振动噪声消除机制
- 批准号:
06555122 - 财政年份:1994
- 资助金额:
$ 17.28万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Two-Dimensional Coil System Compensating X, Y, Z-Components of Leakage Field from an Aperture of Magnetic Shields and its Application to a Large-Scale Cylindrical Shield
补偿磁屏蔽孔径漏磁场X、Y、Z分量的二维线圈系统及其在大型圆柱形屏蔽中的应用
- 批准号:
04555094 - 财政年份:1992
- 资助金额:
$ 17.28万 - 项目类别:
Grant-in-Aid for Developmental Scientific Research (B)
Study on a symbiotic combination of the high-Tc superconducting magnetic shield and the ferromagnetic one with magnetic shaking
高温超导磁屏蔽与磁振荡铁磁屏蔽共生组合研究
- 批准号:
03805035 - 财政年份:1991
- 资助金额:
$ 17.28万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)
相似海外基金
Study on a symbiotic combination of the high-Tc superconducting magnetic shield and the ferromagnetic one with magnetic shaking
高温超导磁屏蔽与磁振荡铁磁屏蔽共生组合研究
- 批准号:
03805035 - 财政年份:1991
- 资助金额:
$ 17.28万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)