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Affiliation |
IWATE University Faculty of Science and Engineering Department of Science and Engineering Electrical and Electronics/Information and Communication Course |
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Position |
Professor |
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Mail Address |
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DAIBO Masahiro
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Research Interests 【 display / non-display 】
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Vector Potential
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holography
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magnetic field measurement
Graduating School 【 display / non-display 】
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-1988.03
Tohoku Gakuin University Faculty of Engineering Electrical Engineering Graduated
Graduate School 【 display / non-display 】
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-1999.03
Iwate University Graduate School, Division of Engineering Electronic information Doctor's Course Completed
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-1990.03
Tohoku Gakuin University Graduate School, Division of Engineering Electrical Engineering Master's Course Completed
Campus Career 【 display / non-display 】
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2023.04-Now
IWATE University Faculty of Science and Engineering Department of Systems Innovation Engineering Studies in Electrical, Electronic, and Communication Engineering Professor [Duty]
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2007.04-2023.03
IWATE University Abolition organization Faculty of Engineering Associate Professor [Duty]
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2006.04-2008.03
IWATE University Faculty of Engineering Electrical and Electronic Engineering Electronic System Engineering [Concurrently]
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2005.04-2007.03
IWATE University Associate Professor (As Old Post Name) [Duty]
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2002.04-2005.03
IWATE University Faculty of Engineering Electrical and Electronic Engineering Electronic System Engineering Lecturer [Duty]
External Career 【 display / non-display 】
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2022.09
King Mongkut's Institute of Technology Ladkrabang School of Science Visiting Professor
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1994.04-2002.03
Iwate Industrial Research Institute Engineer
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1992.04-1993.03
Raytheon Raytheon (trainee)
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1990.04-1994.03
New Japan Radio Co., Ltd. New Japan Radio Co., Ltd.
Research Areas 【 display / non-display 】
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Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Measurement engineering
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Nanotechnology/Materials / Applied condensed matter physics
Course Subject 【 display / non-display 】
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2004
Undergraduate Research
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2004
English Training for Electrical and Electronic Engineering Ⅱ
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2004
English Training for Electrical and Electronic Engineering Ⅰ
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2004
Advanced Electrical Engineering Laboratory
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2004
Media Processing
Research Career 【 display / non-display 】
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Laser SQUID Microscope
Periods of research：
9999.01Keywords : SQUID,non-destructive testing,semiconductor
Style of Research： Collaboration in Japan
Research Program： (not selected)
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Computer Generated Holography
Periods of research：
9999.01Keywords : Hologram,data compression
Style of Research： Individual
Research Program： (not selected)
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Vector Potential Coil and Transformer
Periods of research：
2013.04-NowKeywords : Non-destructive evaluation, Communication
Style of Research： Individual
Research Program： Grant-in-Aid for Scientific Research
Published Papers 【 display / non-display 】
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Vector Potential Coupling From Outside the Loop Through the Superconducting Shield
M. Daibo
IEEE Transactions on Applied Superconductivity ( IEEE ) 33 ( 5 ) 1 - 5 2023.03 [Refereed]
Academic Journal Single Work
We tested whether the Maxwell-Lodge effect, a classi- cal version of the Aharonov-Bohm effect, occurs even when electro- magnetic shielding is provided by a superconducting tube. A long, thin superconducting solenoid coil was confined inside a lead tube so that there was no flux leakage from the coil ends. The double semi-circular vector potential coils ensure that 1) there is no local magnetic field at the location of the copper wire in the secondary coil and 2) there is no magnetic flux inside the loop of the secondary coil. Three different materials with different permeability were used for the core. A coaxial wire secondary coil shielded by a lead tube was placed orthogonally to the center of the semicircle of the primary coil. The voltage generated in the secondary coil at 4.2 K was only reduced to about 1/10 of 300 K. This coupling between the primary and secondary coils is due to the vector potential, since it cannot be completely shielded even with a superconducting shield.
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Y. Shoji and M. Daibo
AIP Advances 13 ( 025127 ) 2023.02 [Refereed]
Academic Journal Multiple authorship
Although vector potentials are more intrinsic physical quantities than magnetic and electric fields, measuring them macroscopically is difficult. A double-nested Helmholtz-type vector potential coil, consisting of an elongated solenoid coil wound around a cylinder, and producing a uniform magnetic vector potential, was developed in this study. The coil is carefully designed to reduce the influence of the leakage magnetic field and the scalar potential generated by the coil’s electrical resistance on the measurement. It has the ability to toggle between vector potential and magnetic field generation. We adapted the coil for use in an optically pumped atomic magnetometer. We also developed an optically pumping Rb atomic magnetometer that can calibrate in a zero magnetic field and applied a time-varying magnetic vector potential. We found that the output signal changed with the vector potential even when there was virtually no magnetic field. With increasing frequency, the output voltage decreases for the magnetic signal and increases for the magnetic vector potential signal. The results revealed that the atomic magnetometer is influenced not only by the magnetic field but also by the magnetic vector potential and that the frequency responses are opposite.
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Self-interference along boundaries between positive and negative refractive index media for 3D displays
Masahiro Daibo, Tomoya Tabuchi, Prathan Buranasiri,
Proc. SPIE 11331 2020.03 [Refereed]
Bulletin of University, Institute, etc. Multiple authorship
Negative index media have a phase velocity opposite to that of the pointing vector. Therefore, if media having the same absolute value of positive and negative refractive indices are alternately arranged, standing waves are generated along the boundaries of the media because these wavelengths are the same and the directions are opposite. We propose a method of generating a stationary interference fringe that is caused by self-interference with irradiating light from a direction parallel to the positive and negative media boundaries.
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Reflective wavefront control using random zero refractive index medium
T. Tabuchi, M. Daibo,
Proc. SPIE 11331 2020.03 [Refereed]
Bulletin of University, Institute, etc. Multiple authorship
The FDTD simulation is performed with a system in which the front-surface is a concave lens, the inside of bulk is a zero refractive index medium in which positive and negative refractive index cells are randomly arranged, and a reflector is placed over the back-surface plane. In a zero-index medium, an outgoing wavefront is always parallel to the outgoing- surface, is independent of either the incident wavefront or the shape of the incoming-surface. After waiting for a while after entering pulsed light into this structure, the light reflected from the back-surface is focused at the focal point of the concave lens over the front-surface.
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DC-Bias-Magnetic-Field Dependence of Step Response in an Elliptically Polarized Single-Beam Atomic Magnetometer
Y. Shoji, S. Khanuengchat, S. Takahashi and M. Daibo
IEEE 2020 8th International Electrical Engineering Congress (iEECON) 2020.03 [Refereed]
Bulletin of University, Institute, etc. Multiple authorship
A single-beam atomic magnetometer with elliptical polarization is simple in construction because it requires only one laser for both pumping and probing. When a small-signal magnetic field is input into the magnetometer after the DC magnetic field is set to zero, a full-wave cleared waveform is output. This characteristic is appropriate for calibration and measurement of DC magnetic fields, because the bias of such fields affects their sensitivity. In this paper, we examined the step-response waveform when a pulsed magnetic field with various DC magnetic-field biases was applied. The response waveform was measured in the time domain with an oscilloscope. The oscillation frequency did not depend on the step-magnetic-field difference but on the amplitude when changing from an absolute-zero magnetic field to a finite magnetic field. Because the DC magnetic field can be determined by measuring the frequency, the bias magnetic field of the atomic magnetometer can be adjusted to maintain the
Presentations 【 display / non-display 】
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DC-Bias-Magnetic-Field Dependence of Step Response in an Elliptically Polarized Single-Beam Atomic Magnetometer
Oral Presentation(General) Y. Shoji, S. Khanuengchat, S. Takahashi and M. Daibo
2020.03 -
Self-interference Along Boundaries Between Positive and Negative Refractive Index Media for 3D displays
Oral Presentation(General) Masahiro Daibo, Tomoya Tabuchi, Prathan Buranasiri
2019.11 -
Reflective Wavefront Control Independent of Incident Wavefront Us- ing Random Zero Refractive Index Medium
Oral Presentation(General) T. Tabuchi and M. Daibo
2019.11 -
Poloidal Vector Potential Transformer
Poster (General) Masahiro Daibo
2019.09 -
The Modeling and Numerical Simulation for Spherical Vector-Potential Coil,
Poster (General) Sarai Lekchaum, Masahiro Daibo
2019.09
Academic Awards Received 【 display / non-display 】
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2001.01
All winners： daibo masahiro
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1998.01
All winners： daibo masahiro
Industrial Property 【 display / non-display 】
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Vector potential generation device, vector potential transformer, shield permeation device, non-contact space electric field generation device, null circuit, and structure for vector potential generation device
Patent
Application number US2016/0300652 A1 Registration number US2016/0300652
Application date： 2016.10.13