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DEVELOPMENT OF OPEN PATH METHANE SENSOR

Research Project

Project/Area Number 06558076
Research Category

Grant-in-Aid for Developmental Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Environmental dynamic analysis
Research InstitutionOKAYAMA UNIVERSITY

Principal Investigator

OHTAKI Eiji  OKAYAMA UNIV.ENVIRON.SCI.AND TECH.PROFESSOR, 環境理工学部, 教授 (40033120)

Co-Investigator(Kenkyū-buntansha) TORIGOE Hiroshi  ADVANET CO.LTD,RESEARCHER, 研究開発部, 研究員
SAZAKI Susumu  ADVANET CO.LTD,PRINCIPAL RESEARCHER, 研究開発部, 主任研究員
TSUKAMOTO Osamu  OKAYAMA UNIV.SCIENCE,ASSOC.PROFESSOR, 理学部, 助教授 (40027298)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥7,800,000 (Direct Cost: ¥7,800,000)
Fiscal Year 1995: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1994: ¥5,500,000 (Direct Cost: ¥5,500,000)
KeywordsEDDY CORRELATION METHOD / AERODYNAMIC METHOD / METHANE / METHANE FLUX / メタンガス / フラックス / 熱収支法
Research Abstract

Methane is an important trace gas in the atmosphere because its high potential to absorb the outgoing longwave radiation. The absorbing potential is about 20 times that of carbon dioxide. It is well known that the methane concentration in the atmosphere is increasing. The major source of this increasing methane concentration has been assumed to be human activities associated with rice cultivation and animal husbandry. The eddy correlation technique is the most promising method to measure methane flux in the atmosphere. However, this technique requires a fast response and high resolution instrument for methane measurement.
A prototype fast response CH4 instrument with open sensing path is developed in the present study. Results of the laboratory and fild test are summarized as follows : (1) The sensitivity of the instrument is about 15.6 ppm per volt. The measuring frequency is 30 Hz. (2) The noise-limited sensitivity is about 0.6 ppm peak-to-peak in CH4 concentration. (3) The sensitivity is practically invariant with a possible change in the adjustment of the optical system. (4) Preliminary test shows that the instrument is feasible for measurements of CH4 flux by the eddy correlation technique under field conditions. However, the present instrument suffers from several limitations. Most serious problem is the inadequate oscillation of He-Ne laser. In order to reduce the noise level of the instrument, further effort is required to control the oscillation of He-Ne laser.

Report

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

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 大滝英治: "海水中の二酸化炭素濃度(pCo_2)測定器の開発" 海の研究. 3. 413-418 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ohtaki, E.: "Open path methane sensor" Proc. of the UK/JAPAN Workshop. 75-84 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ohtaki, E.: "Carbondioxide in surface seawaters of western tropical Pacific Ocean" J. Meteorol. Soc. Japan. 73. 631-637 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Liu, X.: "Eddy correlation measurements of carbon dioxide flux over coastal sea Surface" Bull. Disas. Prev. Res. Inst. Kyoto Univ.45. 17-25 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ohtaki, E.: "Development of measuring instrument of pCO_2 in seawater." Umi no Kenkyu. 3 (in Japanese). 413-418 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ohtaki, E.: "Open path methane sensor." Proceedings of the Uk/Japan Workshop of Controlling Methane and the Nitrogen Cycle on Farms. 75-84 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ohtaki, E.: "Carbon dioxide in surface seawaters of western tropical Pacific Ocean." J.Meteorol.Soc.Japan. 73. 631-637 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Liu.X.: "Eddy correlation measurements of carbon dioxide flux over coastal sea surface." Bull.Disas.Prev.Res.Inst.Kyoto Univ.45. 17-25 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 大滝英治: "海水中の二酸化炭素濃度(pCO_2)測定器の開発" 海の研究. 3. 413-418 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] Ohtaki, E.: "Open path methane sensor" Proc. of the Uk /Japan Workshop. 75-84 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Ohtaki, E.: "Carbon dioxide in surface seawaters of western tropical Pacific Ocean" J. Meteorol. Soc. Japan. 73. 631-637 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Liu, X.: "Eddy correlation measurements of carbon dioxide flux over coastel sea surface" Bull. Disas. Prev. Res. Inst. Kyoto Univ.45. 17-25 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 大滝 英治: "海水中の二酸化炭素濃度(pCO_2)測定器の開発" 海の研究. 3. 1-6 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Ohtaki Eiji: "Direct measurement of carbon dioxide flux over the Ocaan with eddy corrdation technique" Proc.of Int.Symp.IGBP. (印刷中).

    • Related Report
      1994 Annual Research Report
  • [Publications] Ohtaki Eiji: "Carbon dioxide in surface seaunters of westem tropical Pacific Ocean" J.Meteorol.Soc.Japan. (印刷中).

    • Related Report
      1994 Annual Research Report
  • [Publications] Ohtaki Eiji: "Open path methane sensor" Proc.of UK/Japan Workshop. (印刷中).

    • Related Report
      1994 Annual Research Report

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

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