Fig. 1. Diagram of FBG sensor structure

Fig. 2. Structure of mechanics model of sensor unit. (a) Top view; (b) front view

Fig. 3. Force analysis of cantilever beam. (a) Axonometric drawing; (b) front view

Fig. 4. Variations in S and f with L (λ=1550 mm, b=16 mm, h=2 mm, t=5 mm, m=40 g)

Fig. 5. Variations in S and f with b (λ=1550 mm, L=30 mm, h=2 mm, t=5 mm, m=40 g)

Fig. 6. Variations in S and f with h (λ=1550 mm, L=30 mm, b=16 mm, t=5 mm, m=40 g)

Fig. 7. Variations in S and f with m (λ=1550 mm, L=30 mm, b=16 mm, h=2 mm, t=5 mm)

Fig. 8. First-order mode shape diagram of sensor 1

Fig. 9. First-order mode shape diagram of sensor 2

Fig. 10. Experimental system diagram of sensor

Fig. 11. Amplitude-frequency response curves of sensor 1

Fig. 12. Amplitude-frequency response curves of sensor 2

Fig. 13. Time domain diagrams of two FBGs of sensor1 when frequency is 50 Hz and amplitude of excitation acceleration is 10 m·s^-2. (a) FBG1; (b) FBG2

Fig. 14. Linearity curve of sensor 1

Fig. 15. Linearity curve of sensor 2

Fig. 16. Curve of cross-axis anti-interference characteristic of sensor 1

Fig. 17. Curve of cross-axis anti-interference characteristic of sensor 2