Yin Xi, Wan Shengpeng, Xiong Xinzhong, Dong Dezhuang, Liu Heng, Xiao Deng, Lei Ying. Study of a Optical Fiber Acoustic Sensing System Based on F-P Microcavity Structure[J]. Laser & Optoelectronics Progress, 2021, 58(3): 3120031
- Laser & Optoelectronics Progress
- Vol. 58, Issue 3, 3120031 (2021)
Fig. 1. Sensor head structure. (a) Main view; (b) left view
Fig. 2. Schematic of F-P microcavity sensing
Fig. 3. Fabricated GO diaphragm
Fig. 4. Packaged sensor head. (a) Spectrometer display at the maximum interference contrast; (b) encapsulated F-P sensor head
Fig. 5. Optical fiber acoustic sensor syQstem based on F-P microcavity structure
Fig. 6. Speech signals collected by the system
Fig. 7. Wavelet packet decomposition tree
Fig. 8. Multiple-frame comparison method
Fig. 9. Trend term eliminated by least square method. (a) Speech signals collected by the system; (b) speech signals after elimination trend terms
Fig. 10. Signal before and after Wiener denoising. （a） Speech signal;（b） speech signal after Wiener denoising
Fig. 11. Speech spectra before and after Wiener denoising. （a） Speech spectrum； （b） speech spectrum after Wiener denoising
Fig. 12. Reconstructed graphs of one-dimensional wavelet packet coefficient
Fig. 13. One-dimensional wavelet packet coefficient after Wiener denoising
Fig. 14. Speech signal graph and speech spectrum graph obtained by Wiener denoising method based on wavelet packet transform. (a) Speech signal graph; (b) speech spectrum graph
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