電子天びんを用いた真空中でも質量測定 Mass Measurement in Vacuum Using an Electronic Mass Comparator

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A new electronic mass comparator, capable of automatic weighing in vacuum, was introduced into the National Research Laboratory of Metrology. The standard deviation of 0.1 μg, a factor of 3 smaller than the standard deviation of the best previous measurement using a mechanical balance, was achieved for the mass comparison between two 1-kg weights. For eight days, mass difference of two 1-kg weights with the surface area difference of 66.7 cm<SUP>2</SUP> was measured in vacuum. We observed an outgassing rate of 9×10-<SUP>6</SUP> Pa·<SUP>3</SUP>·s<SUP>-1</SUP>·m<SUP>-2</SUP> after an evacuation for 3.9-6.8 hours, and below 6×10<SUP>-9</SUP> Pa·m<SUP>3</SUP>·s<SUP>-1</SUP>·m<SUP>-2</SUP> after an evacuation for 107 hours. Residual gas in the vacuum chamber, which housed the electronic mass comparator, was analyzed to monitor the oil contamination. At a total pressure of 5.5×10<SUP>-4</SUP> Pa, we observed the main peaks due to hydrocarbon at 41, 43, and 57 amu with a partial pressure of 3×10<SUP>-6</SUP> Pa.

収録刊行物

  • 真空  

    真空 43(3), 181-183, 2000-03-20 

    The Vacuum Society of Japan

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各種コード

  • NII論文ID(NAID)
    10004561476
  • NII書誌ID(NCID)
    AN00119871
  • 本文言語コード
    JPN
  • 資料種別
    SHO
  • ISSN
    05598516
  • NDL 記事登録ID
    5360718
  • NDL 雑誌分類
    ZN15(科学技術--機械工学・工業--流体機械)
  • NDL 請求記号
    Z16-474
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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