トウ　リヨウ   Ryo TOH   陶　良    所属   千葉工業大学  工学部 電気電子工学科    千葉工業大学  工学研究科 工学専攻    千葉工業大学  工学研究科 電気電子工学専攻    職種   教授
言語種別	英語
発行・発表の年月	2015/08
形態種別	学術雑誌
査読	査読あり
標題	Effect of Rayleigh Wave on Ultrasonic Underground Imaging
執筆形態	共著
掲載誌名	Physics Procedia
出版社・発行元	ELSEVIER
巻・号・頁	70,pp.360-363
著者・共著者	Ryo Toh, Shun Kawahara, Tsutomu Watanabe, Seiichi Motooka
概要	A three dimensional ultrasonic underground imaging technique using an electromagnetic-induction type sound source and an amplitude correlation synthesis processing method has been proposed. Depending on the conditions of the ground surface, Rayleigh waves may be received with significant amplitude by receivers. That will interfere with the reflect signal from the underground objects and will bring forth error images to the imaging result. In this paper, Rayleigh waves with comparatively high amplitude are measured experimentally in a model field filled with mountain sands, and its waveform is estimated and simulated approximately by an exponentially decaying sinusoidal wave. The effect on the image of underground object is discussed by numerical simulation using the simple Rayleigh wave model. The result images show that the effect of Rayleigh wave is not marked when its peak amplitude is not greater than that of the signal reflected from the underground object.
DOI	10.1016/j.phpro.2015.08.089