DAIBO Masahiro

写真a

Affiliation

IWATE University  Faculty of Science and Engineering  Department of Systems Innovation Engineering  Studies in Electrical, Electronic, and Communication Engineering 

Position

Professor

Mail Address

E-mail address

Research Interests 【 display / non-display

  • Vector Potential

  • holography

  • magnetic field measurement

Graduating School 【 display / non-display

  •  
    -
    1988.03

    Tohoku Gakuin University   Faculty of Engineering   Electrical Engineering   Graduated

Graduate School 【 display / non-display

  •  
    -
    1999.03

    Iwate University  Graduate School, Division of Engineering  Electronic information  Doctor's Course  Completed

  •  
    -
    1990.03

    Tohoku Gakuin University  Graduate School, Division of Engineering  Electrical Engineering  Master's Course  Completed

Degree 【 display / non-display

  • Iwate University -  Dr.(Eng.)  1999.01.01

Campus Career 【 display / non-display

  • 2023.04
    -
    Now

    IWATE University   Faculty of Science and Engineering   Department of Systems Innovation Engineering   Studies in Electrical, Electronic, and Communication Engineering   Professor   [Duty]

  • 2007.04
    -
    2023.03

    IWATE University   Abolition organization   Faculty of Engineering   Associate Professor   [Duty]

  • 2006.04
    -
    2008.03

    IWATE University   Faculty of Engineering   Electrical and Electronic Engineering   Electronic System Engineering   [Concurrently]

  • 2005.04
    -
    2007.03

    IWATE University   Associate Professor (As Old Post Name)   [Duty]

  • 2002.04
    -
    2005.03

    IWATE University   Faculty of Engineering   Electrical and Electronic Engineering   Electronic System Engineering   Lecturer   [Duty]

External Career 【 display / non-display

  • 2022.09
     
     

    King Mongkut's Institute of Technology Ladkrabang   School of Science   Visiting Professor  

  • 1994.04
    -
    2002.03

    Iwate Industrial Research Institute   Engineer  

  • 1992.04
    -
    1993.03

    Raytheon   Raytheon (trainee)  

  • 1990.04
    -
    1994.03

    New Japan Radio Co., Ltd.   New Japan Radio Co., Ltd.  

Research Areas 【 display / non-display

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Measurement engineering

  • Nanotechnology/Materials / Applied condensed matter physics

 

Course Subject 【 display / non-display

  • 2004

    Undergraduate Research

  • 2004

    English Training for Electrical and Electronic Engineering Ⅱ

  • 2004

    English Training for Electrical and Electronic Engineering Ⅰ

  • 2004

    Advanced Electrical Engineering Laboratory

  • 2004

    Media Processing

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Research Career 【 display / non-display

  • Laser SQUID Microscope

    Periods of research:

    9999.01
     
     

    Keywords : SQUID,non-destructive testing,semiconductor

    Style of Research: Collaboration in Japan

    Research Program: (not selected)  

  • Computer Generated Holography

    Periods of research:

    9999.01
     
     

    Keywords : Hologram,data compression

    Style of Research: Individual

    Research Program: (not selected)  

  • Vector Potential Coil and Transformer

    Periods of research:

    2013.04
    -
    Now

    Keywords : Non-destructive evaluation, Communication

    Style of Research: Individual

    Research Program: Grant-in-Aid for Scientific Research  

Published Papers 【 display / non-display

  • 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.

    DOI

  • Differential behavior of magnetic field and magnetic vector potential in an optically pumped Rb atomic magnetometer

    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.

    DOI

  • 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.

    DOI

  • 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.

    DOI

  • 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

    DOI

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Presentations 【 display / non-display

  • 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
     
     

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Academic Awards Received 【 display / non-display

  • 2001.01

    All winners: daibo masahiro

  • 1998.01

    All winners: daibo masahiro

Industrial Property 【 display / non-display

  • 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

Association Memberships 【 display / non-display

  • 1996.01
     
     
     

    IEEE