Non-contact Acoustic Contour Imaging Method Using Phase Difference in Extremely Shallow Underground  

作　　者：Tsuneyoshi Sugimoto Ryo Akamatsu Touma Abe 

机构地区：[1]Department of Electronics and Information, Faculty of Engineering, Toin University of Yokohama, Yokohama 225-8503, Japan [2]Inspection Division, IHI Inspection & Instrumentation Co., Ltd., Tokyo 140-0014, Japan

出　　处：《Journal of Energy and Power Engineering》2012年第12期2010-2017,共8页能源与动力工程（美国大卫英文）

摘　　要：Buried object which exists at extremely shallow underground can be detected by using an acoustic vibration and a SLDV （scanning laser Doppler vibrometer）. Non-contact acoustic exploration can be realized by using air coupled sound. It was confirmed that discovery and the identification of a buried thing were possible using the OFR method （optimum frequency range method）. However, in this method, only the amplitude of the vibration speed spectrum is used and did not use the phase information. Therefore a new imaging method is proposed that used the phase information of the vibration speed spectrum. From the experimental results, the possibility of the outline extraction by using the phase difference between each scan point is confirmed. As a future task, the phase difference image will become clearer by changing the scan point density and long duration time of emitted wave.

关 键 词：Phase difference non-contact acoustic exploration contour imaging scanning laser Doppler vibrometer optimumfrequency range. 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] TS803.4[自动化与计算机技术—计算机科学与技术]