li wei, zhuang liu, hengchun li, dazhou jiang. Fiber Bragg Grating Vibration Sensor Based on Sensitive Structure for "士"-Shaped Beam[J]. Acta Optica Sinica, 2019, 39(11): 1106004
- Acta Optica Sinica
- Vol. 39, Issue 11, 1106004 (2019)
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
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Table 1. Structure and material parameters of FBG vibration sensor
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Table 2. Sensitivity of FBG vibration sensor under different excitation frequencies
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