Fig. 1. Schematic diagram of three-dimensional FBG acceleration sensor

Fig. 2. Simulation analysis of elastomer under force F_x. (a) Three-dimensional simplified model; (b) strain distributions of upper surfaces of beams; (c) strain distributions of lower surfaces of beams

Fig. 3. Simulation analysis of specific paths under force F_x. (a) Center lines of beam surfaces;（b）relationship between strain and distance on five paths

Fig. 4. Relationship between strain and distance on five paths under force F_z

Fig. 5. Layout of FBGs on elastomer

Fig. 6. Vibration test and signal acquisition system. (a) Structural diagram; (b) physical prototype

Fig. 7. Amplitude-frequency characteristic curves of sensor in x and y directions.（a）x-direction；（b）y-direction

Fig. 8. Amplitude-frequency characteristic curve of sensor in z-direction

Fig. 9. Test results of sensor under excitations in x and y directions. (a) Results of three tests (excitation along x-direction); (b) average values of three tests (excitation along x-direction); (c) linear fitting curve of x-axis (x-direction); (d) results of three tests (excitation along y-direction); (e) average values of three tests (excitation along y-direction); (f) linear fitting curve of y-axis (y-direction)

Fig. 10. Test results of sensor under z-direction excitation. (a) Results of three tests; (b) average values of three tests; (c) linear fitting curve of z-axis

Fig. 11. Transverse interference test results of sensor under excitations in x and y directions at different frequencies. (a) x-direction excitation; (b) y-direction excitation

Fig. 12. Transverse interference test results of sensor under z direction excitation at different frequencies

Fig. 13. Test system for temperature-compensation performance of sensor

Fig. 14. Test results of temperature-compensation performance of sensor