Discrimination of the Background Media of Concrete Using the Multi-Reflected Waves and Electromagnetic Impact Driving Method
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概要
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Effective methods to detect the internal conditions of embankments (soil and sand, soaked water, or hollow cavities) nondestructively from the surface are expected for the prediction of the collapse of embankments. In this paper, we present an approach for discriminating the background media of concrete by the quality factor of the resonant peaks of multi-reflected elastic waves obtained by electromagnetic impact driving method. In order to receive the multi-reflected elastic waves with high signal-to-noise ratio, a reinforcing bar steel buried inside the concrete is utilized as a sound source with vibration induced by impact electromagnetic field radiated by a spiral coil placed on the surface of concrete. The quality factor of the resonant peak of multi-reflected waves in the spectrum derived by the linear prediction coefficient is employed for discrimination. The comparative results of different background media, such as air, sand, and water are presented in the case of both the numerical simulation and the experiment. The quality factors show the same tendency with acoustic reflectivities on the interface of concrete and different background media, such as air, sand and water.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2003-05-15
著者
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Tao Liang
Department Of Electrical Electronics And Computer Engineering. Faculty Of Engineering Chiba Institut
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Motooka Seiichi
Department of Electrical, Electronics and Computer Engineering, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan
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Motooka Seiichi
Department of Electronics Engineering, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan
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