1990 Fiscal Year Final Research Report Summary
Research on Evaluation of and Protection from Electromagnetic Field in Highly Advanced Social Systems
Grant-in-Aid for Co-operative Research (A)
|Allocation Type||Single-year Grants |
|Research Institution||Institute of Industrial Science, The University of Tokyo |
KAWAMURA Tatsuo IIS, University of Tokyo, Professor, 生産技術研究所, 教授 (20013097)
SUZUKI Toshio CRIEPI, Manager, 部長
MATSUMOTO Takaie Fac . Eng., Shizuoka Univ., Assoc. Prof., 工学部, 助教授 (40157368)
ISHII Masaru IIS, Univ. of Tokyo, Associate Prof., 生産技術研究所, 助教授 (40107397)
ISAKA Katsuo Fac. Eng., Tokushima Univ., Professor, 工学部, 教授 (50035630)
KOUNO Teruya Fac. Eng., Univ. of Tokyo, Professor, 工学部, 教授 (30010705)
|Project Period (FY)
1989 – 1990
|Keywords||Electric Field / Magnetic field / Electromagnetic Interference / Measurement / Biological Effect|
The research has been devoted on (1) Measurement and analysis of electric and magnetic field in power frequency ; (2) Method of evaluation of ion flow and low-frequency magnetic field in an organism ; (3) Measurement and analysis of wide-band electromagnetic field.
Regarding the fields of power frequency, factors influencing the accuracy of a conventional electric field meter are analyzed. A new 3-dimensional magnetic-field sensor employing a hole device is developed, and magnetic-field environment in a living room is investigated. Computer codes for the analysis of 3-D magnetic field in air have also been developed, and magnetic fields around a power station or a transmission line are evaluated. These are fundamentals in the research of the impact of power-frequency fields on the environment.
Low-frequency intense magnetic field or ion flow need to be evaluated in the aspect of environmental influence, as the social system develops. Analyzing methods have been developed, and physical and biological phenomena under intense magnetic field are experimentally investigated, showing the importance of the subject to be investigated further.
In regard to induction or interference to various systems, measurement and evaluation of wide-band electromagnetic field are studied. Artificial electromagnetic noise such as in the vicinity of a power, station and natural noise from lightning discharges have been measured by wide-band recording devices. A new electro-optic electric field measuring device incorporating a Pockets' cell and interferometric technique is developed. Wide-band electromagnetic noise of up to GHz generated by a discharge of a small gap is investigated in relation to the phase of the discharge phenomena. In the theoretical aspect, the mechanism of induction of voltage on a distribution line or a communication line by wide-band electromagnetic field is clarified.
Research Products (16results)