Fig. 1. Distribution diagram of FBG sensing elements. (a) Three-dimensional distribution; (b) sectional view

Fig. 2. Displacement contours of x-axis simulated by ANSYS

Fig. 3. Displacement diagram of x-axis of packaging material when F=5.2 N

Fig. 4. Contours of temperature field distribution

Fig. 5. Temperature sensing curves of FBG under different initial temperatures

Fig. 6. Pressure response curves of FBG obtained by experiment and simulation

Fig. 7. Tactile response curves of FBG

Fig. 8. Center wavelength drift of FBG at different load positions

Fig. 9. Center wavelength drift of FBG at different temperatures and pressures

Fig. 10. Relationship between number of hidden nodes and performance of BP neural network training

Fig. 11. Error performance curves of BP neural network training process

Fig. 12. Absolute error of output pressure of BP neural network. (a) FBG1; (b) FBG2