High-Speed Measurement of Mode Shapes and Vibrational Displacement in Piezoelectric Resonators Using Two Lasers with Different Wavelengths
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概要
- 論文の詳細を見る
Our new method solves the limitation, that is, the requirement of two measurements with different device driving levels, of the previous system for measuring the in-plane vibrational displacement, using two lasers with adequately separated wavelengths. Different interference factors $\gamma$s are determined for each speckle image by using the lasers. The ratio of the two $\gamma$s is proportional to the reciprocal of the wavelength ratio. The distributions of the absolute vibrational displacement can be mapped based on this relationship and statistical processing of the speckle images. Red-and-violet semiconductor lasers were used in the actual measurement system. A 23-MHz circular AT-cut quartz resonator was used to test the validity of our method, and the results are compared here to the results previously obtained by the two-level burst wave excitation method.
- 2008-05-25
著者
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Watanabe Yasuaki
Graduate School of Science and Engineering, Tokyo Metropolitan Univ.
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Sekimoto Hitoshi
Graduate School Of Engineering Tokyo Metropolitan University
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Goka Shigeyoshi
Graduate School Of Engineering Tokyo Metropolitan University
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Sato Takayuki
Graduate School Of Sci. And Engineering Tokyo Metropolitan Univ.
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Imaeda Noriyuki
Graduate School Of Science And Engineering Tokyo Metropolitan Univ.
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Imaeda Noriyuki
Graduate School of Science and Engineering, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
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Sato Takayuki
Graduate School of Engineering, Tokyo Metropolitan University, 1-1 Minamiosawa, Hachioji, Tokyo 192-0397, Japan
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Watanabe Yasuaki
Graduate School of Engineering, Tokyo Metropolitan University, 1-1 Minamiosawa, Hachioji, Tokyo 192-0397, Japan
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