三極眞空管を應用して微細な變位或は振動を測定する器械並に其應用數種

DOI
  • 小幡 重一
    The Aeronautical Research Institute. Tokyo Imperial University

書誌事項

タイトル別名
  • An Instrument for Measuring Very Small Displacement or Motion and Its Various Applications

抄録

In the present article are described the detailed construction and various examples of applicatons of the "Ultramicrometer", a new instrument for measuring small displacement or motion utilizing a generating valve circuit. In its usual form the instrument consists of a tuned grid circuit, but it can easily be changed to the Colpitts-Hartley circuit. The displacement or motion to be measured is made to produce either a change in the capacity in the circuit or a change in the eddy-current loss, and in consequence a corresponding change in the anode current of the valve is resulted. This change in the anode current is measured with a galvanomter, or if a permanent record is needed, an Einthoven string galvanometer or a Duddell oscillograph is employed. The anode current itself is balanced by means of the potentiometer method or a small transformer is inserted in the anode circuit.<br>With this instrument the capacity method as well as the eddy-current method may be carried out, and the anode current may be balanced or a transformer may be inserted, all the necessary resistances and transformer being contained in the instrument.<br>As the examples of applications of the instrument are described the recording of earth-movements, direct recording of accelerations, an electrical indicator for high-speed internal-combustion engines, precise recording of sounds, pressure-variations and various mechanical vibrations.

収録刊行物

  • 電氣學會雜誌

    電氣學會雜誌 48 (474), 38-52, 1928

    一般社団法人 電気学会

詳細情報 詳細情報について

  • CRID
    1390282680119956864
  • NII論文ID
    130003613254
  • DOI
    10.11526/ieejjournal1888.48.38
  • ISSN
    21876797
    00202878
  • 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

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