Abstract
This chapter presents eddy current volume heating thermography (ECVHT) and phase analysis for delamination and impact inspection in carbon fiber reinforced plastics (CFRP). The proposed method has been verified through experimental studies under both transmission and reflection modes. After discrete Fourier transform (DFT) of temperature responses, the phasegram and phase spectra can be used to image and characterize interface delamination and impacts in CFRP due to elimination of the nonuniform heating effect and carbon fiber structures. With the whole temperature response processed by DFT, carbon fiber structures and delamination can be differentiated due to periodic oscillation of phase spectra. With temperature response in the cooling phase processed by DFT, some characteristic features can be extracted to construct new phase images according to the shape of the phase spectra. In summary, using ECVHT and phase analysis greatly enhances image characterization for delamination and impact compared to conventional visible optical inspection system and eddy current pulsed thermography (ECPT).
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