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PROPAGATION EXPERIMENT AND THEORY OF THE VLF ELECTROMAGNETIC PULSE WAVE IN THE UNDERGROUND

Research Project

Project/Area Number 03650321
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 電子機器工学
Research InstitutionKANAZAWA UNIVERSITY

Principal Investigator

NAGANO Isamu  KANAZAWA UNIVERSITY FACULTY OF TECHNOLOGY PROFESSOR, 工学部, 教授 (50019775)

Co-Investigator(Kenkyū-buntansha) ENDO Koujyo  KANAZAWA UNIVERSITY FACULTY OF TECHNOLOGY ASSISTANT, 工学部, 助手 (80242535)
ポール・A・ローゼン  金沢大学, 自然科学研究科, 助手
満保 正喜  金沢大学, 工学部, 教授 (90019696)
ポール・A ローゼン  金沢大学, 自然科学研究科, 助手
Project Period (FY) 1991 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1992: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1991: ¥1,600,000 (Direct Cost: ¥1,600,000)
KeywordsVLF pulse generator / SIT / Deep underground / ELF / VLF propagation / EMTD / ULF / 大振幅電磁パルス
Research Abstract

This research has been carried out over two years on the base of following two categories:
1. Design and production of an electromagnetic pulse generator.
2. Experiment and analysis of the wave propagation into the underground.
As for the item 1, we have developed a portable high power VLF pulse generator to transmit a VLF pulse into deep underground. The generator consists of a condenser bank, high-power static induction transistors(SIT) and a circuit to control them. A series of pulses with a current of 1000AT at the frequencies ranging from 100Hz to 100kHz can be generated to drive a loop antenna. The driving current can be raised up to 2000AT by connecting the antenna directly to the condenser bank. As for the item 2, we carried out a propagation experiment of a pulse transmitted from a loop antenna with two turns and a radius of 2m using the pulse generator. The search coil sensor was set at a distance of 30m far from the transmitter and received the resultant pulse wave forms of a direct wave and a reflected wave from underground. We tried to separate a reflected wave from a deep surface under the ground into the resultant wave forms referring the calculated direct wave form from the antenna. The most suitable set up of the transmitter and receiver was discussed to obtain the reflected pulse wave form with better signal to noise ratio from the underground.

Report

(3 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • Research Products

    (23 results)

All Other

All Publications (23 results)

  • [Publications] 長野 勇,遠藤 恒常 他4名: "地下電磁波放射用低周電流パルス波の発生装置" 第2回地下電磁計測ワークショップ論文集. 71-78 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 新保 哲也,長野 勇 他3名: "地中に置かれたボータイアンテナの動作特性の測定" 第2回地下電磁計測ワークショップ論文集. 33-38 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] M.Tsutsui et al.,: "Magnetic Radiations from Harness Wires of Spacecraft" IEICE TRANS.COMMN.E75-B. 174-182 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] S.Yagitani et al.,: "Comparison between particle simulation and full wave analysis for wave propagation in a nonuniform plasma" Radio Science. 27. 449-462 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] I.Nagano et al.,: "Intensity of the Australian Omega signal Observed by the AKEBONO satellite" Proceedings of ISAP'92. 1. 189-192 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] S.Yagitani et al.,: "Full wave calculation of ELF/VLF wave fields radiated from a dipole antenna in the ionosphere" Proceedings of ISAP'92. 1. 185-188 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] I. Nagano, K. Endo, K. Imai, S. Morita, Y. Ishiwaka and T. Shinbo: "A high-power VLF pulse generator for deep underground measurement" Proceedings of the 2nd Workshop on Subsurface Electromagnetic Measurements. 71-78 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T. Shinbo, A. Okamoto, T. Abe, K. Date and I. Nagano: "Measurement for the characteristics of bow-tie antenna in soil:" Proceedings of the 2nd Workshop on Subsurface Electromagnetic Measurements. 33-38 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] M. Tsutsui, K. Kojima, I. Nagano, H. Sato, T. Okada, H. Matsumoto, T. Mukai and M. Kawaguchi: "Magnetic radiations from haness wires of spacecraft" IECE Trans. Commun.E75-B. 174-182 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] S. Yagitani, I. Nagano, Y. Omura and H. Matsumoto: "Comparison between particle simulation and full wave analysis for wave propagation in a nonuniform plasma" Radio Science. 27. 449-462 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] I. Nagano, P. Rosen, S. Yagitani, K. Miyamura, M. Hata, I. Kimura, K. Hashimoto and T. Okada: "Intensity of the Australian Omega signal observed by the Akebono satellite: Comparison with a full wave calculation" Proceedings of ISAP'92. 189-191 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 長野 勇、遠藤 恒常 他4名: "地下電磁波放射用低周波電流パルス波の発生装置" 第2回地下電磁計測ワークショップ論文集. 71-78 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 新保 哲也、長野 勇 他3名: "地中に置かれたボータイアンテナの動作特性の測定" 第2回地下電磁計測ワークショップ論文集. 33-38 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] M,Tsutsui et al.,: "Magnetic Radiations from Harness Wires of Spacecraft" IEICE TRANS.COMMN.E75-B. 174-182 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] S.Yagitani et al.,: "Comparison between particle simulation and full wave analysis for wave propagation in a nonuniform plasma" Radio Science. 27. 449-462 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] I.Nagano et al.,: "Intensity of the Australian Omega signal Observed by the AKEBONO satelite" Proceedings of ISAP'92. 1. 189-192 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] S.Yagitani et al.,: "Full wave calculation of ELF/VLF wave fields radiated from a dipole antenna in the ionosphere" Proceedings of ISAP'92. 1. 185-188 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 長野 勇: "VLF電磁パルス波の地中伝搬実験"

    • Related Report
      1991 Annual Research Report
  • [Publications] Tsutsui: "Magnetic Rodration from Harness Wires of Spacecraft" IEICE Trans.on Communication.

    • Related Report
      1991 Annual Research Report
  • [Publications] Yagitani: "Comparison between particle simulation and fullーware analysis for wave propagation in a nonuniform plasma" Radio Seience.

    • Related Report
      1991 Annual Research Report
  • [Publications] 新保 哲也: "アンテナ付近の媒質による地中レ-ダアンテナ特性" 電子情報通信学会論文誌 BーII.

    • Related Report
      1991 Annual Research Report
  • [Publications] Nagano: "Intensity of the Australian Orega Signal observed by the Akebono Satellite" ISAP'92.

    • Related Report
      1991 Annual Research Report
  • [Publications] Yagitani: "Full wave Calculation of ELF/VLF wave fields radiated from adipole antenna in the ionosphere" ISAP'92.

    • Related Report
      1991 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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