TY - JOUR
TI - Experimental study on infrared thermal wave detection of honeycomb sandwich structure defects by using barker code excitation
AU - Tang Qing-Ju
AU - Bu Hong-Ru
AU - Gu Zhuo-Yan
AU - Li Hao-Dong
AU - Xie Rui
AU - Vavilov Vladimir
AU - Chulkov Arsenii
JN - Thermal Science
PY - 2025
VL - 29
IS - 2
SP - 1273
EP - 1279
PT - Article
AB - The paper describes a thermal testing system implementing Barker code thermal  wave excitation accurately detect defects in GFRP/NOMEX honeycomb sandwich  structures. Influence of defect parameters on detection efficiency is  explored. Four algorithms, namely, PCA, PPT, THD, and TW-PCA, have been used  to process infrared image sequences. The obtained results show that all  algorithms suppress background noise to a certain degree, but the TW-PCA  technique has proven to be more effective providing the higher both  signal-to-noise ratio and information entropy.