Fig. 1. Schematic diagram of THz time-domain spectrum detection

Fig. 2. Schematic diagram of terahertz wave transmission response

Fig. 3. Schematic of THz-TDS

Fig. 4. THz-TDS pulse spectrum imaging system schematic

Fig. 5. Design drawing of ceramic fiber composite sample

Fig. 6. Time-domain waveforms of debonding parts of ceramic matrix composites
(a): Original time domain signal; (b): Deconvolution filter processing time domain signal

Fig. 7. Time domain waveform corresponding to different media interfaces of the sample
(a): Bonding; (b): Debonding

Fig. 8. Slice diagram of tomography scanning

Fig. 9. Effect diagram of bilateral filtering
(a): Original image of terahertz scanning imaging;(b): Effect picture of bilateral filtering processing σ_d=1.4, σ_r=0.1

Fig. 10. Refractive index curve of ceramic fiber composite

Fig. 11. Debonding tomography of ceramic matrix composites
(a): N-layer debonding imaging; (b): M-layer debonding imaging