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CHARACTERISTICS OF TIME-EVOLUTION OF LASER-PRODUCED PLASMA IN WATER VAPOR

Research Project

Project/Area Number 06650326
Research Category

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

Allocation TypeSingle-year Grants
Research Field 電力工学・電気機器工学
Research InstitutionKobe University

Principal Investigator

ARAI Kenji  Kobe University, Faculty of Engineering, Professor, 工学部, 教授 (80031079)

Co-Investigator(Kenkyū-buntansha) CHO Mengu  Kobe University, Graduate School of Science and Technology, Assistant, 大学院・自然科学研究科, 助手 (60243333)
NAKAMOTO Satoshi  Kobe University, Faculty of Engineering, Technician, 工学部, 教務職員 (10198260)
TAKENO Hiromasa  Kobe University, Faculty of Engineering, Assistant, 工学部, 助手 (90216929)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1995: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1994: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsLaser-produced Plasma / Induced Lightning / Extinction Of Lightning / Measurement Of Discharge Light / Shock Wave
Research Abstract

As a fundamental research of extinction of lightning, which is the advanced scheme of laser-induced lightning, we have experimentally investigated the characteristics of time-evolution of laser-produced plasma in water vapor for two years. The experiments have been carried out from two kinds of aspects, and we have obtained following results.
1. The time-evolution of the radiation of the plasma is measured with resolving into its wavelength components, and obtained each spectrum is analyzed. Just after the ignition, the continuous spectra are analyzed, and we have obtained the electron temperature of 5000-7000K.After a long period of time (over 10musec) , line spectra are enalyzed, and we have found the electron density of 10^<22>-10^<23>m^<-3> and decay time constant of 8musec. The remained problems are the reliability of the value of electron density by the analysis of continuous spectra and the unknown electron temperature in a long period of time.
2. We have examined the characteristics of plasma by applying a weak electric field. The amount of electric charge drawing from the plasma is proportional to the electric field strength and inversely proportional to the distance between electrodes. In order to examine the time variation, the pulsed electric field is applied. The results suggest that the shock wave produced with the plasma and/or water vapor affect the motion of the charged particles. A precise model is necessary to interpret the results and to know the plasma characteristics, but the present model just explains partial results, and it is insufficient for complete explanation. More experimental data are needed.
Some problems are remained, but we have obtained the initial data for the farseeing aim of the extinction of lightning.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (21 results)

All Other

All Publications (21 results)

  • [Publications] 竹の裕正: "弱電界印加によるレーザ光生成プラズマの経時変化計測" 放電研究. No. 144. 67-70 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 王暁黎: "微水滴中における炭酸ガスレーザー生成プラズマの経時変化計測" 神戸大学大学院自然科学研究科紀要. 第13号B. 11-17 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 趙孟佑: "CO_2レーザーによるプラズマ生成過程のシミュレーション" 電気学会論文誌A. 115. 553-562 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hiromasa Takeno: "Fundamental Study on Laser Induced Pischarge in Cloud Due to Optical And Electrical Measurements with Numerical Simulations" Proceedings of 9th International Symposium on High Voltage Engineering. 6. 6770-1-6770-4 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Mengu Cho: "NON-EQUILIBRIUM SIMULATION OF LASER-INDUCED GAS BREAKDOWN PROCESSES" Proceedings of 11th International Conference on Gas Discharge and Their Applications.2. 96-99 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 趙孟佑: "レーザ生成衝撃波の気中伝搬過程の数値シミュレーション" 電気学会論文誌A. 115. 1088-1097 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hiromasa Takeno: "Time-resolved Measurement of Laser-produced Plasma with Applying Weak Electric Field" Journal of The Japan Research Group of Electrical Discharges. No.144. 67-70 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Xiaoli Wang: "Time-resolved Measurement of CO_2 Laser-produced Plasma in Water Vapor" Memoirs of Graduate School of Science and Technology, Kobe University. No.13-B. 11-17 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Mengu Cho: "Computer Simulation of CO_2 Laser-Induced Plasma Production Processes" Transaction of IEE of Japan. Vol.115-A,No.7. 553-562 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hiromasa Takeno: "Fundamental Study on Laser Induced Discharge in Cloud Due to Optical And Electrical Measurements with Numerical Simulations" Proceedings of 9th International Symposium on High Voltage Engineering. Vol.6. 6770-1-4 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Mengu Cho: "NON-EQUILIBRIUM SIMULATION OF LASER-INDUCED GAS BREAKDOWN PROCESSES" Proceedings of 11th International Conference on Gas Discharges and Their Applications. Vol.2. 96-99 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Mengu Cho: "Computer Simulation of Laser-Induced Shock Wave Propagation in Gas" Transaction of IEE of Japan. Vol.115-A,No.11. 1088-1097 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 趙 孟佑: "CO_2レーザーによるプラズマ生成過程のシミュレーション" 電気学会論文誌A. 115. 553-562 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Hiromasa Takeno: "Fundamental Study on Laser Induced Disharge in Cloud Due to Optical Aud Electrical Measurements with Numerical Simulations" Proceedings of 9th International Symposium on High Voltage Engineering. 6. 6770-1-6770-4 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Mengu Cho: "NON-EQUILIBRIUM SIMULATION OF LASER-INDUCED GAS BREAKDOWN PROCESSES" Proceedings of 11th International Conference on Gus Pischarges and Their Applications. 2. 96-99 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 趙 孟佑: "レーザ生成衝撃波の気中伝搬過程の数値シミュレーション" 電気学会論文誌A. 115. 1088-1097 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 趙 孟佑 他: "レーザ生成プラズマの成長・減衰過程の理論・数値解析II" 電気学会・放電研究会資料. ED94-31. 11-20 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 竹堅裕正 他: "微水滴中レーザ光生成プラズマの計測と解析" 電気学会・放電研究会資料. ED94-80. 1-10 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 趙 孟佑 他: "レーザ生成衝撃波の気中伝搬過程の数値シミュレーション" 電気学会・放電研究会資料. ED94-81. 11-20 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 竹堅裕正 他: "弱電界印加によるレーザ光生成プラズマの経時変化計測" 放電研究. No.144. 67-70 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 趙 孟佑 他: "CO_2レーザによるプラズマ生成過程のシミュレーション" 電気学会論文誌. (掲載予定). (1995)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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