Novel Detection System Using Double-Layered Piezoelectric Transducer in Same Polarization Direction for Sub-Harmonic Components Generated from Plastic-Deformed Metal Rod
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概要
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A novel detection system for sub-harmonic components of ultrasonic pulse waves is constructed. A new double-layered piezoelectric transducer (DLPT), having the same polarization direction for each layer, is introduced to enhance the sensitivity for sub-harmonic components. In the case of DLPT stacked and bonded to one another in the same polarization direction, the resonance frequencies of the DLPT, $ f_{\text{r}}$, are $ f_{0}$ in a parallel connection and $ f_{0}/2$ in a series connection. As a result, the receiving sensitivity of the sub-harmonic components is increased by approximately 30 dB and the receiving sensitivity of fundamental components is decreased by approximately 20 dB, compared with those in the parallel connection. As an application of this system, the detection of sub-harmonic components generated from plastic-deformed metal rods is demonstrated. The DLPT system can be used to detect some deformed samples, while sub-harmonic components cannot be detected using a single transducer system.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2008-05-25
著者
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Imano Kazuhiko
Department Of Electrical & Electronic Engineering Mining College Akita University
-
Nishihira Morimasa
Department Of Electrical And Electronic Engineering Faculty Of Engineering And Resource Science Akit
-
Fukuda Makoto
Department Of Applied Photonics System Technology
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Imano Kazuhiko
Department of Electrical and Electronic Engineering, Faculty of Engineering and Resource Science, Akita University, Akita 010-8502, Japan
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