Nondestructive and noncontact evaluation on FRP composite laminates using a terahertz ray

Abstract

Recently, a terahertz ray (T-ray) technique has emerged as one of the most promising new powerful nondestructive evaluation (NDE) techniques, and new application systems are under processing development for the area applications. In this study T-ray technique will be adopted for the characterization of the FRP composite solid laminates as an imaging and useful nondestructive evaluation (NDE) tool. So, in order to detect and evaluate the flaws in FRP solid composite laminates a new time-domain spectroscopy system was utilized. Various experimental measurements in reflection and through-transmission modes were made in order to map out the T-ray images. Especially in this characterization procedure, we estimated the electromagnetic properties such as the refractive index and a couple of techniques were proposed to measure the refractive index. It is found that estimations of properties with the proposed different ways are in good agreement with known data. Furthermore woven CFRP Honey comb sandwich panel with Al wire were observed in reflection mode and limitations will be mentioned in the T-ray processing.