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Terahertz scanning techniques for paint thickness on CFRP composite solid laminates
Authors:Kwang-Hee Im  In-Young Yang  Sun-Kyu Kim  Jong-An Jung  Young-Tae Cho  Yong-Deuck Woo
Affiliation:1.Department of Automotive Engineering,Woosuk University,Chonbuk,Korea;2.Department of Mechanical Design Engineering,Chosun University,Gwangju,Korea;3.Division of Mechanical System Engineering,Chonbuk National University,Jeonbuk,Korea;4.Department of Mechanical and Automotive Engineering,Songwon University,Gwangju,Korea;5.Department of Manufacturing Design Engineering,Jeonju University,Jeonbuk,Korea
Abstract:Terahertz ray (T-ray) scanning applications are promising tools. The use of T-ray for nondestructive evaluation was investigated on composite materials. In this characterization procedure, electromagnetic properties, such as the refractive index, were analyzed. The estimates of properties are in good agreement with known data. We successfully demonstrated the characteristics of T-ray propagating through Carbon fiber-reinforced plastic (CFRP) composites to acquire the refractive index by using the characterized material properties. A T-ray technique was developed for measuring paint thickness on CFRP laminates. Good results were obtained from tests performed on standard paint samples with thickness starting from approximately 100 μm. The method was based on reflection mode measurement with time of flight. Another method developed for measuring paint thickness using resonance frequencies was utilized to determine paint thickness on composite laminates. The paint thickness deduced from resonance frequencies agrees well with the result obtained directly from time-domain echoes.
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