Xinghua TU, Haiyang ZHAO. A polymer⁃encapsulated fiber Bragg grating ultrasonic sensor[J]. Chinese Journal of Quantum Electronics, 2025, 42(2): 286
- Chinese Journal of Quantum Electronics
- Vol. 42, Issue 2, 286 (2025)
Fig. 1. FBG model with polymer package
Fig. 2. Schematic of edge filtering method
Fig. 3. Grating strain varying with Young's modulus
Fig. 4. Grating strain varying with Poisson's ratios
Fig. 5. Reflection spectra of fiber grating under three polymer encapsulations
Fig. 6. Designed diagram of the fiber grating ultrasonic sensing experimental system
Fig. 7. Spectrum of the fiber Bragg grating
Fig. 8. Voltage waveform diagram of gratings at different frequencies. (a) 60 kHz; (b) 48 kHz; (c) 30 kHz
Fig. 9. Effect of sound source distance on signal voltage under different materials. (a) Bare FBG; (b) PVC; (c) ABR; (d) PU
Fig. 10. Peak voltage varies with distance
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Table 1. Different material characteristic parameters
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