Highly sensitive high frequency carrier type thin film sensor
| Project/Area Number |
14350214
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 Institute of Electrical Communication, Professor, 電気通信研究所, 教授 (40006268)
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| Co-Investigator(Kenkyū-buntansha) |
YABUKAMI Shin Tohoku University, Research Institute of Electrical Communication, Research Associate, 電気通信研究所, 助手 (00302232)
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| Project Period (FY) |
2002 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥14,300,000 (Direct Cost: ¥14,300,000)
Fiscal Year 2003: ¥5,000,000 (Direct Cost: ¥5,000,000)
Fiscal Year 2002: ¥9,300,000 (Direct Cost: ¥9,300,000)
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| Keywords | phase detection / high frequency carrier type thin film sensor / magnetic field / highly sensitive / Dual Mixer Time Difference Method / 高周波キャリア型薄膜磁界センサ / 超高感度磁界計測 |
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| Research Abstract |
We propose herein a method by which to measure the phase of the carrier in a high frequency carrier-type sensor (GMI sensor). The proposed method is based on a carrier suppression technique. The phase of the carrier signal changed dramatically by approximately 180 degrees around the carrier suppression when a small dc field was applied. The phase sensitivity for a small DC field reached 3600 degrees/Oe. In addition we investigate the relationship between phase sensitivity and suppressed carrier level in the suppression circuit, the measured data nearly corresponded to theoretical data. We have fabricated a sensor system which is composed of sensor element and Dual Mixer Time Difference (DMTD) method to detect a change of phase difference as a function of small magnetic field. Sensor element was fabricated as a meander pattern, and the phase difference was about 5 degrees/Oe. The jitter level was decreased about 5.5x10^<-4> degrees when the sample rate was 1 kHz. The resolution of magnetic field detection was obtained about 3.3x10^<-6> Oe/Hz^<1/2>.
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Report
(3 results)
Research Products
(20 results)
