“…In 2003, the combination of the transmission with the guided wave methods was adopted to assist ACUT for the detection of the flaws, damages and normal inter defects in CFRP composites [1]. Also, ACUT was employed to measure and evaluate the fiber orientations in orthotropic composite laminates [2]. As compared with the quality of detecting GFRP(Glass Fiber Reinforced Polymer), ACUT in CFRP has better results of detection in terms of the shape, magnitude, thickness and position [3].The abilities of ACUT and AIRT (active infrared thermography) to detect the delamination of GFRP composites were compared both qualitatively and quantitatively [4].…”