Liquid-Level Sensing by Trapped-Energy-Mode Thickness Vibration
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概要
- 論文の詳細を見る
A new method is presented for detecting a small-scale variation in liquid level using an energy-trapping phenomenon in piezoelectric thickness-mode vibrators. In a piezoelectric plate operating in a trapped-energy mode, an evanescent field is created in the surrounding region of the plate. When this region is dipped in a liquid, a small leakage of vibration energy occurs. The amount of leakage varies depending on how deep the surrounding region is in the liquid. Therefore, small variations in liquid level are detected by observing the changes in the electric characteristics of the vibrators, such as quality factor and the electric conductance $G$. Preliminary experiments have shown that almost linear variations in $G$ against dipping depth can be obtained within a few millimeter range.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2009-07-25
著者
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Yamada Ken
Department Of Applied Chemistry Faculty Of Science And Technology Keio University
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Yamada Ken
Department of Electronic Engineering, Tohoku Gakuin University, Tagajo, Miyagi 985-8537, Japan
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Honda Hisato
Department of Electronic Engineering, Tohoku Gakuin University, Tagajo, Miyagi 985-8537, Japan
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Horiuchi Shuhei
Graduate School of Engineering, Tohoku Gakuin University, Tagajo, Miyagi 985-8537, Japan
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Kinai Tetsuya
Department of Electronic Engineering, Tohoku Gakuin University, Tagajo, Miyagi 985-8537, Japan
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