Non-destructive inspection of CFRPs using phase-transformed induction heating thermography

点击翻译按钮获取中文摘要

Non-destructive inspection of CFRPs using induction heating was studied in this study. In addition to conventional temperature images, phase images obtained by applying Fourier transform to temperature-time relation was used for defect detection. Experiments for CFRP specimens with artificial defects show that, though nonuniform heating occurred in temperature images owing to the shape of induction coil, the nonuniform heating was suppressed in the phase images at a cirtain frequency. Because of this suppression, the defects obscured by nonuniform heating in the temperature images were clearly detected in the phase images, resulting in improved defect detectability. Theoretical calculations revealed that the influence of nonuniform heating in the phase images periodically decreased and that the period was equal to the reciprocal of heating duration.