超伝導重力計を用いた重力観測に及ぼす室内温度変化の影響 Effect of Room Temperature Changes on Gravity Observation with Superconducting Gravity Meters

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Spatial and temporal variations of room temperature in the gravity observation room of Kyoto University were investigated with 13 quartz thermometers for clarifying the effect of room temperature changes on precise gravity observation with superconducting gravity meters. Observational data of room temperature and gravity in July 10, 1993-July 9, 1994 were analyzed. Although the air conditioner has not been operating in the observation room, annual and diurnal changes of room temperature are 10°C and 0.2°C at the most, respectively. Ratios of these changes to atmospheric temperature changes were about 0.5 and 0.03, respectively. The effect of room temperature changes on gravity observation is considered to be caused by thermal expansion of piers of gravity meters, movements of the tilt control system depending upon temperature changes, as well as thermal noise of electric circuits. Gravity changes due to thermal expansion of piers are in the order of a few ngals in a year and 0.01 ngal in a day at the most. Those due to movements of the tilt control system depending upon temperature changes are lower than 1 ngal. On the other hand, thermal noise of electric circuits might cause gravity changes in the order of 1 Fugal in proportion to annual change of room temperature. In a period band shorter than a few days, however, it causes gravity changes by 0.01 μgal at the most. Therefore, the effect of room temperature changes on gravity observation can be ignored in that shorter period band, even if the air conditioner is not used.

収録刊行物

  • 測地学会誌

    測地学会誌 41(2), 197-206, 1995-06-25

    The Geodetic Society of Japan

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各種コード

  • NII論文ID(NAID)
    10003709457
  • NII書誌ID(NCID)
    AN00134900
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    00380830
  • NDL 記事登録ID
    3623770
  • NDL 刊行物分類
    ME00(地球科学)
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z15-161
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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