管内空気柱の音響周波数変化を利用した変位の精密測定　　動的端補正と位相進角の関係

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  • A new measuring method of displacement and position by means of variations of sound frequency and air column in a small pipe. (Relationship between active end correction and transit angle).
  • カンナイ クウキ チュウ ノ オンキョウ シュウハスウ ヘンカ オ リヨウシタ

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This paper deals with the development and analysis of a new measuring method of displacement and position by means of the variations of the sound frequency and the air column in a resonant pipe. Sound generates when compressed air is blown onto an open-ended face of a small pipe. The sound frequency varies with the length of the air column in the resonant pipe. By applying this phenomena, a new, accurate and simple measuring method for the displacement and position is examined and developed. The displacement corresponds to the length of the air column and the variation of the sound frequency shows a good relationship with the displacement. The resonant frequency of the pipe can be shown by a simple equation; however, the resonant frequency does not coincide with the sounding frequency of the pipe. The difference of these two frequencies could be introduced in this paper as an active end correction of the pipe.

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