Fig. 1. Structural diagram of FBG sensor

Fig. 2. Analysis of force of sensing system

Fig. 3. Vibration model

Fig. 4. Variations in S and f with R

Fig. 5. Variations in S and f with h

Fig. 6. Variations in S and f with r

Fig. 7. Variations in S and f with m

Fig. 8. Deformation diagrams obtained by finite element modal analysis. (a) First-order mode without considering fiber force and diamond structure and fiber; (b)-(d) first-order,second-order,and third-order modes considering fiber force and diamond structure, respectively

Fig. 9. Sensor experimental system. (a) Diagram of calibration experimental system; (b) demodulation principle of optical signal

Fig. 10. Amplitude-frequency response curves of sensor

Fig. 11. Time domain and frequency domain signals of two FBGs of sensor when f=100 Hz and a=5 m·s-2. (a) FBG1, time domain signal; (b) FBG1, frequency domain signal; (c) FBG2, time domain signal; (d) FBG2, frequency domain signal

Fig. 12. |Δλ1-Δλ2| versus excitation acceleration under different excitation frequencies

Fig. 13. Sensor sensitivity versus frequency of excitation signal

Fig. 14. Principal and transverse accelerations of accelerometer

Fig. 15. Temperature response curves of FBG accelerometer