陽子共鳴による地磁気測定法について

• 小島 昌治

  東京教育大学

• 小川 静子

  お茶の水女子大学

• 鳥塚 一男

  東京学芸大学

• 大井 喜久夫

  東京教育大学

書誌事項

タイトル別名

• Proton Free Induction Method for Earth's Magnetic Field

抄録

The method developed by Packard and Varian was tested and improved in some points. A magnetic field of about one hundred gausses was applied to the proton magnetic moment in water for several seconds in such way as it was perpendicular to the earth's field and then removed in a short time. Macroscopically, the polarized proton magnetic moment then started precession toward the earth's magnetic field. The precession, however, decayed in a few seconds. As a result of this experiment, it was proved that an inhomogeneous field or paramagnetic impurities dissolved in water shorten the decay time. A new method of rotateing sample was tried to observe a signal which decays in a short time owing to inhomogeneity of field. This method is effective to observe a signal when the earth's field has a small gradient.<BR>In order to simplify the measurement of signal frequncy a method of intensity modulation of oscilloscope was tried. A standard frequency "f" about twice as high as the resonance frequency "f₀" was imposed on the grid of oscilloscope. With this method, two decaying beat waves, which have opposite each other and a frequency of "f-f₀" were observed. From this frequency the earth's field was measured to the extent of two gammas.

収録刊行物

• 計測

  計測 7 (8), 456-461, 1957

  公益社団法人 計測自動制御学会

詳細情報

• CRID: 1390001205122091392
• NII論文ID: 130003765206
• DOI: 10.11499/sicejl1951.7.456
• ISSN: 18838154
• ISSN: 04500024
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可