K.I. Arai

chapter

Optical scanning probe system for electromagnetic near field measurements

M. Takahashi, K. Kawasaki, H. Ohba, T. Ikenaga, more

2009 IEEE International Symposium on Electromagnetic Compatibility > 6 - 11

2009 IEEE International Symposium on Electromagnetic Compatibility - EMC 2009

An optical scanning electromagnetic field probe system, consisting of an electro-optic or magneto-optic crystal substrate and a galvano scanner, has been developed for high speed, low-invasive measurement of electromagnetic near field distribution. We demonstrate the measurement of electric field distributions using a LiNbO₃ crystal substrate and the probe system. We also measure magnetic field distributions...

chapter

Electromagnetic near field distribution measurements using optically scanning system

M. Takahashi, K. Kawasaki, H. Ohba, T. Ikenaga, more

2009 International Symposium on Electromagnetic Compatibility - EMC Europe > 1 - 4

2009 EMC Europe Workshop Materials in EMC Applications (EMC Europe Workshop)

An optically scanning electromagnetic field probe system, consisting of an electro-optic or magneto-optic crystal substrate and a galvano scanner, has been developed for the high speed, low-invasive measurement of electromagnetic near field distribution. We present some examples of electromagnetic field distribution measurements above a microstrip line using a LiNbO₃ or a magnetic garnet crystal substrate...

article

A thin film magnetic field sensor of sub-pT resolution and magnetocardiogram (MCG) measurement at room temperature

S. Yabukami, K. Kato, Y. Ohtomo, T. Ozawa, more

Journal of Magnetism and Magnetic Materials > 2009 > 321 > 7 > 675-678

We developed a very sensitive high-frequency carrier-type thin film sensor with a sub-pT resolution using a transmission line. The sensor element consists of Cu conductor with a meander pattern (20mm in length, 0.8mm in width, and 18μm in thickness), a ground plane, and amorphous CoNbZr film (4μm in thickness). The amplitude modulation technique was employed to enhance the magnetic field resolution...

article

Jaw Tracking System Using Resonated Wireless Markers

S. Yabukami, H. Kanetaka, S. Hashi, K.I. Arai, more

IEEE Transactions on Magnetics > 2009 > 45 > 10 > 4880 - 4883

We have developed a jaw tracking system with wireless resonated markers. The system consists of two resonated markers, driving coil, 40 pickup coils, DA converter, and AD converters. The two resonated markers were composed of a coil with NiZn ferrite and tip condenser. We attached to one marker on the incisor and the other on the forehead. Position accuracy of within 1 mm was achieved when the fabricated...

article

Numerical Study on the Improvement of Detection Accuracy <newline/>for a Wireless Motion Capture System

S. Hashi, S. Yabukami, H. Kanetaka, K. Ishiyama, more

IEEE Transactions on Magnetics > 2009 > 45 > 6 > 2736 - 2739

A detection technique having an accuracy of better than 1 mm is required for body motion analysis in the field of medical treatment. A wireless magnetic motion capture system is one such effective detection technique. We propose a candidate system using an LC resonant magnetic marker (LC marker). Previous studies have showed that the system is capable of repeatable position detection accuracy of better...

article

Visualization of Poynting Vectors by Using Electro-Optic Probes for Electromagnetic Fields

E. Suzuki, S. Arakawa, M. Takahashi, H. Ota, more

IEEE Transactions on Instrumentation and Measurement > 2008 > 57 > 5 > 1014 - 1022

We visualized electromagnetic-energy flows by using newly developed electro-optic probes, which cause little interference with the surrounding electromagnetic fields. Amplitudes and phases of all electric- and magnetic-field components were measured near a coupled line and a patch antenna by the probes. The time-varying Poynting vectors near the objects were evaluated with the data and were visualized...

chapter

Electromagnetic Field Distribution Measurements Using an Optically Scanning Probe System

M. Takahashi, K. Kawasaki, H. Ohba, H. Ota, more

2007 IEEE International Symposium on Electromagnetic Compatibility > 1 - 6

2007 International Symposium on Electromagnetic Compatibility

An optically scanning electromagnetic field probe system, consisting of an electro-optic or magneto-optic crystal substrate and a galvano scanner, has been developed for high speed, low-invasive measurement of electromagnetic field distribution. We present some examples of measurement of electric field distributions using a LiNbO₃ crystal substrate and the probe system. We have also measured magnetic...

article

Wireless Magnetic Motion Capture System—Compensatory Tracking of Positional Error Caused by Mutual Inductance

S. Hashi, M. Toyoda, S. Yabukami, K. Ishiyama, more

IEEE Transactions on Magnetics > 2007 > 43 > 6 > 2364 - 2366

A wireless magnetic motion capture system using an LC resonant magnetic marker was developed and has been studied. The positional error of the system caused by mutual inductance between the exciting coil and the LC marker was examined. It has been found that the impedance change of the exciting coil due to a resonance of the LC marker perturbs the strength of the magnetic field which is used for marker...

article

Wireless Magnetic Motion Capture System for Multi-Marker Detection

S. Hashi, M. Toyoda, S. Yabukami, K. Ishiyama, more

IEEE Transactions on Magnetics > 2006 > 42 > 10 > 3279 - 3281

A wireless multi-motion capture system using five LC resonant magnetic markers has been developed and is demonstrated. Each marker has an individual resonant frequency, 157, 201, 273, 323, and 440 kHz, respectively. A new measuring technique is applied in order to reduce the acquisition time. In this new technique the markers are excited by a superposed wave corresponding to the all resonant frequencies,...

article

Wireless motion capture system using magnetically coupled LC resonant marker

S. Hashi, Y. Tokunaga, S. Yabukami, T. Kohno, more

Journal of Magnetism and Magnetic Materials > 2005 > 290-291 > Part 2 > 1330-1333

A novel motion capture system using magnetically coupled LC resonant marker have been developed. This system composed from the LC marker, a driving coil and a pickup coil array. The marker consists only of an inductor and a capacitor without battery or electric wires, and driven wirelessly by the action of electromagnetic induction. The position accuracy was around 2mm when the marker was located...

article

Impedance property of thin film GMI sensor with controlled inclined angle of stripe magnetic domain

T. Nakai, H. Abe, S. Yabukami, K.I. Arai

Journal of Magnetism and Magnetic Materials > 2005 > 290-291 > Part 2 > 1355-1358

The giant magnetoimpedance (GMI) effect of controlled-inclination magnetic stripe domain for a thin-film GMI sensor is investigated. The inclined stripe domain structure has an inclined angle of domain walls against the transverse direction of the rectangular-strip element. It is obtained that GMI profile changes from a profile with a dip point at the zero magnetic field to a profile with one maximum...

article

A design of highly sensitive GMI sensor

S. Yabukami, H. Mawatari, N. Horikoshi, Y. Murayama, more

Journal of Magnetism and Magnetic Materials > 2005 > 290-291 > Part 2 > 1318-1321

Employing amplitude-modulation technique, we have optimized the giant magnetoimpedance (GMI) sensor. Our approach was to optimize the sensor structure so as to obtain a high signal-to-noise ratio by using finite element analysis. The optimum size of sensor strip is as follows: a thickness of 4.3μm, a strip width of 20–30μm, a length of several mm. The meander sensor element [CoNbZr (thickness, 4.3μm;...

article

EO probe for simultaneous electric and magnetic near-field measurements using LiNbO/sub 3/ with inverted domain

E. Suzuki, S. Arakawa, H. Ota, K.I. Arai, more

IEEE Transactions on Microwave Theory and Techniques > 2005 > 53 > 2 > 696 - 701

This paper presents a new type of optical probe for simultaneous measurements of electric and magnetic near fields with high accuracy up to the gigahertz range. Its probe head consists of a loop antenna element that is doubly loaded with LiNbO₃ electrooptic crystals. Using optical technology, it can work as a conventional double-loaded loop probe without metallic cables and electrical hybrid junction...

article

Soft magnetic applications in the RF range

M. Yamaguchi, Y. Miyazawa, K. Kaminishi, H. Kikuchi, more

Journal of Magnetism and Magnetic Materials > 2004 > 268 > 1-2 > 170-177

Soft magnetic thin-film applications in the RF range are systematically described based on the complex permeability profile of the films. This work demonstrates the metallic thin-film permeability measurements up to 6GHz under the existence of traveling electric field, two types of ferromagnetic RF integrated inductor with the best properties of L=7.9nH and Q=12.7 at 2GHz for a 200x400μm size four-turn...

article

Three-dimensional analysis of swimming properties of a spiral-type magnetic micro-machine

A. Yamazaki, M. Sendoh, K. Ishiyama, T. Hayase, more

Sensors & Actuators: A. Physical > 2003 > 105 > 1 > 103-108

The swimming properties of a spiral-type magnetic micro-machine were analyzed theoretically using 3D finite volume method. The basic equations of incompressible viscous fluid flow were integrated. The flow field around the micro-machine was calculated to estimate the swimming velocity, thrust, drag, and load torque of a spiral-type magnetic micro-machine. Good agreement was obtained between the experimental...

chapter

Characteristics of an optical magnetic field probe consisting of a loop antenna element doubly-loaded with LiNbO/sub 3/

E. Suzuki, T. Miyakawa, H. Ota, K.I. Arai, more

2003 IEEE International Symposium on Electromagnetic Compatibility, 2003. EMC '3. > 1 > 88 - 91 Vol.1

2003 IEEE International Symposium on Electromagnetic Compatibility (EMC)

We propose a new type of optical probe designed to detect magnetic near-fields with high accuracy up to the gigahertz range. The probe head consists of a loop antenna element doubly-loaded with electro-optic crystals. It optically realizes the operation of a conventional doubly-loaded loop probe and requires no metallic cables or hybrid junction. We examined the probe characteristics for magnetic...

article

Highly sensitive permeability measurements obtained by electrical impedance

S. Yabukami, R. Ojima, M. Yamaguchi, K.I. Arai, more

Journal of Magnetism and Magnetic Materials > 2003 > 254-255 > Complete > 111-114

We propose a highly sensitive method of obtaining permeability. Permeability was obtained from electrical impedance of strips by using wafer probe. The permeability of a CoNbZr strip was evaluated as a function of magnetic field intensity. Measured values approached those of the Landai-Lifshitz-Gilbert (LLG) theory with decreasing field intensity. The proposed method is better than the conventional...

article

Cross measurements of thin-film permeability up to UHF range

M. Yamaguchi, O. Acher, Y. Miyazawa, K.I. Arai, more

Journal of Magnetism and Magnetic Materials > 2002 > 242-245 > Part 2 > 970-972

Permeability of the 0.37-0.79μm thick CoNbZr and FeCoMoSiB film samples has been cross-measured in a 10MHz-6GHz range by the two independently developed permeameters in Japan and France. The measurement jigs are unique and the calibration procedures are also unique for both groups. The measured hard axis permeability profiles and LLG calculation for CoNbZr films agreed within an error of 15% up to...

article

Magnetic micromachines for medical applications

K. Ishiyama, M. Sendoh, K.I. Arai

Journal of Magnetism and Magnetic Materials > 2002 > 242-245 > Part 1 > 41-46

The spiral-type magnetic micromachine can swim in a liquid and in a gel. In addition, this machine has a function of heating. This machine is suitable for local heat treatment in the body. The active bending is obtained by attached tiny magnet at the tip of the guide-wire. This is simple and useful for inserting the catheter to the lung or to the blood tube.

article

Remarkable improvement of sensitivity for high-frequency carrier-type magnetic field sensor with ferromagnetic resonance

T. Nakai, M. Yamaguchi, H. Kikuchi, H. Iizuka, more

Journal of Magnetism and Magnetic Materials > 2002 > 242-245 > Part 2 > 1142-1145

Imaginary part of permeability becomes greater than real part in a special case of ferromagnetic resonance in thin films. The distribution of current density in the film arises a phase rotation with huge magnitude to the normal direction of the film. We confirm this phenomenon by experiments, and the application to the high-frequency carrier-type magnetic field sensor makes a remarkable improvement...

INFONA - science communication portal

Search results for: K.I. Arai

Optical scanning probe system for electromagnetic near field measurements

Electromagnetic near field distribution measurements using optically scanning system

A thin film magnetic field sensor of sub-pT resolution and magnetocardiogram (MCG) measurement at room temperature

Jaw Tracking System Using Resonated Wireless Markers

Numerical Study on the Improvement of Detection Accuracy <newline/>for a Wireless Motion Capture System

Visualization of Poynting Vectors by Using Electro-Optic Probes for Electromagnetic Fields

Electromagnetic Field Distribution Measurements Using an Optically Scanning Probe System

Wireless Magnetic Motion Capture System—Compensatory Tracking of Positional Error Caused by Mutual Inductance

Wireless Magnetic Motion Capture System for Multi-Marker Detection

Wireless motion capture system using magnetically coupled LC resonant marker

Impedance property of thin film GMI sensor with controlled inclined angle of stripe magnetic domain

A design of highly sensitive GMI sensor

EO probe for simultaneous electric and magnetic near-field measurements using LiNbO/sub 3/ with inverted domain

Soft magnetic applications in the RF range

Three-dimensional analysis of swimming properties of a spiral-type magnetic micro-machine

Characteristics of an optical magnetic field probe consisting of a loop antenna element doubly-loaded with LiNbO/sub 3/

Highly sensitive permeability measurements obtained by electrical impedance

Cross measurements of thin-film permeability up to UHF range

Magnetic micromachines for medical applications

Remarkable improvement of sensitivity for high-frequency carrier-type magnetic field sensor with ferromagnetic resonance

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