Abstract
THz electromagnetic wave has been receiving an increasing attention in many engineering applications because of the following characteristics. THz wave transmits many kinds of materials except for metals and water. Materials have their own fingerprint absorption spectrum. THz wave is safe for human body. Especially the transmission property of THz wave enables us to develop nondestructive inspection technique for the material structure. In this study, fundamental study on 3D defect imaging for the substrate material under coating was conducted. Terahertz time-domain spectroscopy (THz-TDS) system was employed for the THz scanning imaging. Integrity evaluation was conducted for bottom steel plate with corrosion protection paint in oil tank using portable THz-TDS system.
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