音響を利用したシートの枚数検出法　第３報　伝達関数の位相による紙および布の検出

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  • Method of Detecting Number of Sheets Using Sound. 3rd Report. Detection of Paper and Cloth by Phase of Transfer Function.
  • オンキョウ オ リヨウシタ シート ノ マイスウ ケンシュツホウ 3 デンタツ

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A new method of detecting the number of moving sheets without contact has been investigated. This paper deals with the development of a method of detecting the number of sheets of paper and cloth. This detecting method utilizes the variations of the phase of the transfer function of the entire acoustic system including the sheets. The impedance of sheets varies with their number. Thus the number of sheets shows good correspondence with the phase of the transfer function of the acoustic system. The experimental result shows that the number of moving paper sheets can be detected without contact, and also the number of sheets of cloth which are sufficiently clumped between the end face of the pipe and a rigid wall can be detected.

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