Fig. 1. Schematic diagram of dual-slant cone sensor structure

Fig. 2. Comparison of deformation between simulation of regular cone and slant cone. (a) Animation of deformation; (b) time domain signal graph

Fig. 3. Schematic diagram of acoustic emission signals in FBG detection board

Fig. 4. Schematic diagram of structural parameters of slant cone base

Fig. 5. Curves of pressure and displacement vary with β . (a) Pressure; (b) displacement

Fig. 6. Curves of pressure and displacement vary with diameter d of slant cone bottom. (a) Pressure; (b) displacement

Fig. 7. Curves of pressure and displacement vary with cone height. (a) Pressure; (b) displacement

Fig. 8. Inclination i. (a) Curves of pressure variation with cone height; (b) schematic diagram of sudden change point at i=1.138

Fig. 9. Time domain diagram of pressure and displacement. (a) Pressure; (b) displacement

Fig. 10. Actual structure of sensing device. (a) Slant cone base; (b) dual-slant cone sensing device

Fig. 11. Schematic and physical diagram of narrowband light source demodulation system. (a) Optical path diagram; (b) physical diagram

Fig. 12. Sinusoidal response (150-155 kHz) of dual-slant cone FBG sensor. (a) Time domain signal graph; (b) frequency domain signal graph

Fig. 13. Sine response curve of dual-slant cone FBG. (a) 20-70 kHz; (b) 80-130 kHz

Fig. 14. Fitting lines of relationship between response voltage and driving voltage

Fig. 15. Comparison diagrams of sinusoidal signals detected by different sensors. (a) Amplitude comparison; (b) signal-to-noise ratio comparison