著者
谷地舘 藍 佐藤 弘二 佐藤 彰 薮上 信 小澤 哲也 小林 伸聖 中居 倫夫 荒井 賢一 Ai Yachidate Koji Sato Akira Sato Shin Yabukami Tetsuya Ozawa Nobukiyo Kobayashi Tomoo Nakai Arai Ken Ichi
雑誌
【A】基礎・材料・共通部門 マグネティックス研究会
巻号頁・発行日
2010-12-16

センサ素子全体を薄膜プロセスにより作成した伝送線路型薄膜磁界センサを試作した。アモルファスCoNbZr薄膜とコプレーナ型伝送線路を組み合わせ、被測定磁界に対するキャリア信号の位相変化を検出対象とする磁界センサを製作した。試作した磁界センサのインピーダンスおよび位相変化を測定し、その結果を報告する。
著者
大友 祐一 薮上 信 加藤 和夫 小澤 哲也 荒井 賢一
出版者
公益社団法人 日本磁気学会
雑誌
Journal of the Magnetics Society of Japan (ISSN:18822924)
巻号頁・発行日
vol.33, no.3, pp.283-286, 2009-05-01 (Released:2009-05-21)
参考文献数
5
被引用文献数
2 2

We developed a very sensitive high-frequency carrier-type magnetic-field sensor with a sub-pT resolution using a transmission-line-type sensor. Meander-type sensor elements using amorphous CoNbZr films (4μm in thickness), Cu conductor with a meander pattern (30 mm in length, 1.0 mm in width, 18 μm in thickness), and a ground plane were fabricated. We obtained a magnetic field resolution of 9.1×10-13 T/Hz1/2 at 1 Hz. The detectable magnetic field was limited by the 1/f noise. We detected a magnetocardiogram (MCG) signal of heartbeats with the sensor.
著者
小澤 哲也 山田 洋 佐藤 弘二 小島 健 薮上 信 小林 伸聖 中居 倫夫 荒井 賢一
出版者
公益社団法人 日本磁気学会
雑誌
Journal of the Magnetics Society of Japan (ISSN:18822924)
巻号頁・発行日
vol.37, no.1, pp.1-7, 2013-01-01 (Released:2013-01-08)
参考文献数
12
被引用文献数
10

We report the results we obtained from applying a magnetic system to detect cracks using a thin film magnetic field sensor to measure the hole of aluminum. The thin film magnetic field sensor consisted of a coplanar line and amorphous CoFeSiB film. The main characteristic of the sensor is that the phase of the carrier signal changes when a magnetic field is applied. The sensitivity of the developed sensor was 70 deg./Oe. We used the thin film magnetic field sensor in an experiment to measure leakage magnetic flux from the surface of the aluminum while applying an AC magnetic field to the aluminum. The surface of the aluminum was scanned by an electric stage with a motor. The phase value of the sensor was converted to a voltage value, and then measured with a lock-in amplifier. As a result, the hole of aluminum was detected by measuring the distribution of the leak magnetic flux on the aluminum surface.
著者
薮上 信 加藤 和夫 加茂 芳邦 小澤 哲也 荒井 賢一
出版者
公益社団法人 日本磁気学会
雑誌
Journal of the Magnetics Society of Japan (ISSN:18822924)
巻号頁・発行日
vol.32, no.4, pp.483-486, 2008-07-01 (Released:2008-07-18)
参考文献数
7
被引用文献数
1 1

We developed a very sensitive high-frequency carrier-type magnetic field sensor with a pT resolution using a transmission-line-type sensor. Meander-type sensor elements using amorphous CoNbZr films were fabricated. We obtained a magnetic field resolution of 3.0 x 10-12 T/Hz1/2 at 1 Hz. The detectable magnetic field was limited by the 1/f noise. We detected the magnetocardiogram (MCG) signal by using the sensor.
著者
小澤 哲也 馬渡 宏 薮上 信 石山 和志 荒井 賢一
出版者
公益社団法人 日本磁気学会
雑誌
日本応用磁気学会誌 (ISSN:02850192)
巻号頁・発行日
vol.29, no.8, pp.831-837, 2005 (Released:2007-05-10)
参考文献数
5
被引用文献数
2 2

The impedance and phase characteristic of a magnetic thin film changes when a magnetic field is applied. The high-frequency-carrier magnetic field sensor, also called a GMI sensor, employs this phenomenon as its principle. We directed our attention to the change in the phase characteristic, and measured the dc magnetic field by measuring the phase as a phase difference, using the dual-mixer time-difference method. We optimized the method and the continuous sampling condition to measure the phase difference, and developed an efficient system for measuring the continuous sampling phase difference with low noise. The system was successfully used to measure the ac magnetic field by continuous sampling of the phase difference of a high-frequency-carrier magnetic field sensor.
著者
山口 正洋 薮上 信 中田 浩一 荒井 賢一 板垣 篤 板垣 喜一 斎藤 昇 布田 孝一 渡辺 光春 高橋 洋 田母神 隆 桜田 幸雄
出版者
一般社団法人電子情報通信学会
雑誌
電子情報通信学会技術研究報告. MW, マイクロ波
巻号頁・発行日
vol.97, no.342, pp.7-12, 1997-10-27

多層プリント配線板によりシールディドループ構造の平面形コイルをアレイ化することにより, 電子回路近傍の電磁ノイズマッピング装置を開発した。パルスモータによる可動装置を用いることで0.1mm刻みの高分解能計測を実現し, 直交する2つの磁界検出コイルを用いることにより磁界の強度および方向を2次元ベクトルとして測定できるようにした。
著者
山口 正洋 薮上 信 中田 浩一 荒井 賢一 板垣 篤 板垣 喜一 斎藤 昇 布田 孝一 渡辺 光春 高橋 洋 田母神 隆 桜田 幸雄
出版者
公益社団法人日本磁気学会
雑誌
日本応用磁気学会誌 (ISSN:18804004)
巻号頁・発行日
vol.22, no.4, pp.849-852, 1998-04-15
被引用文献数
3

We developed a near-field magnetic noise mapping system by using a shielded-loop type coil array. High-resolution(01.mm)two-dimensional magnetic field vector detection was realized. We demonstrated a noise map of the loop antenna, microstrip line, and printed circuit board of a personal computer.
著者
中村 浩二 荒井 賢一
出版者
公益社団法人 日本地震学会
雑誌
地震 第2輯 (ISSN:00371114)
巻号頁・発行日
vol.48, no.4, pp.451-461, 1996-03-12 (Released:2010-03-11)
参考文献数
6
被引用文献数
2

A tsunami was generated by the 1994 Hokkaido Toho-Oki earthquake and was observed at tidal stations on the Pacific coast of the Japanese Islands. It was observed also at several tidal stations on Hokkaido coast of the Okhotsk Sea, where the arrival of the initial wave was recorded earlier than the expected time: for example, the initial motion of the tsunami was recorded at Utoro 17 minutes after the mainshock, while that the theoretically expected tsunami arrival time from the source in the south sea region of Shikotan Island is 80 minutes after it. We tried to estimate the location of the source of the early coming waves by drawing the inverse refraction diagram from each station. We suggest two probable locations of the source; one is the area 80 kilometers north of Abashiri, and the other is the area 40 kilometers north of the tip of Shiretoko Peninsula. The seismic activity at both of those areas is poor. So, we cannot judge that the early coming waves were generated by some another events. Both of those areas are situated in the continental slope regions and with steep slopes. We suppose that a land slide at either of those areas caused the early coming waves.
著者
仙道 雅彦 島崎 克彦 石山 和志 井上 光輝 荒井 賢一
出版者
公益社団法人日本磁気学会
雑誌
日本応用磁気学会誌 (ISSN:18804004)
巻号頁・発行日
vol.23, no.4, pp.1657-1660, 1999-04-15
被引用文献数
24

The fundamental swimming properties of spiral-type magnetic micro-machines were investigated in detail by constructing four micro-machines with differnt structures. These micro-machines are able to swim in various liquids with kinematic viscosities ranging from 1.37 to 1000mm^2/s. This result suggests that the micro-machines have potential medical uses. In particular, they can swim against the stream in a liquid whose the velocity is comparable to the that of venous blood.
著者
千葉 淳 仙道 雅彦 石山 和志 荒井 賢一
出版者
社団法人日本生体医工学会
雑誌
生体医工学 : 日本エム・イー学会誌 (ISSN:1347443X)
巻号頁・発行日
vol.42, no.4, pp.313-317, 2004-12-10
被引用文献数
1

In this paper, the authors propose applying a magnetic actuator to a capsule endoscope. We fabricated a capsule-type magnetic actuator and investigated its moving properties in a silicone tube and in pig intestines. The device consists of a dummy capsule measuring 11 mm in diameter and 40 mm in length, a magnetic actuator composed of a permanent magnet inside the dummy capsule and a 1-mmφ spiral structure outside the capsule. The permanent magnet is magnetized in the direction of the diameter. When a rotational magnetic field is applied, the magnetic actuator rotates and moves wirelessly. In this study, we measured the effect of the spiral shape on the velocity and thrust properties. According to our experimental results using the silicone tube, the optimal actuator was formed with 4 spirals set at a spiral angle of 45 degrees. In the subsequent moving test performed in pig intestines, the actuator traveled a distance of 450 mm to its destination in the large intestine in 150 s, and a distance of 400 mm to its destination in the small intestine in 110s. This result confirms the potential applicability of the actuator as a guidance system for capsule endoscopes.
著者
千葉 淳 仙道 雅彦 石山 和志 荒井 賢一
出版者
公益社団法人日本磁気学会
雑誌
日本応用磁気学会誌 (ISSN:18804004)
巻号頁・発行日
vol.29, no.3, pp.343-346, 2005-03-01
被引用文献数
2 12

Application of a magnetic actuator to a capsule endoscope is proposed. Capsule-type magnetic actuators were fabricated and their motion properties were investigated in a silicone tube and in the intestine of a pig. The dummy capsule is 11mm in diameter and 40mm in length. This magnetic actuator is composed of a permanent magnet inside the dummy capsule and spiral structures outside it. The permanent magnet is magnetized in the direction of the diameter. When a rotational magnetic field is applied, the magnetic actuator rotates and moves wirelessly. The velocity of capsules with top spirals was examined in a silicone tube. In addition, a motion test was conducted in the intestine of a pig. The actuator can pass through the small and the large intestines over distances of 450mm and 400mm, respectively, in less than 150s. The capsule can pass out of the bag-shaped section of the large intestine. This result shows that the actuator has the potential to be used in the guidance system of a capsule endoscope.