Jianguan Tang, Yuzhe Liu, Chengli Li, Huiyong Guo, Minghong Yang. Distributed Vibration Sensing System with High Signal-to-Noise Ratio Based on Ultra-Weak Fiber Bragg Grating[J]. Acta Optica Sinica, 2021, 41(13): 1306014
- Acta Optica Sinica
- Vol. 41, Issue 13, 1306014 (2021)
Fig. 1. Schematic diagram of dual-pulse interference between adjacent gratings
Fig. 2. Experimental setup of distributed vibration sensing system based on UWFBG array
Fig. 3. Principle of adaptive filtering of LMS algorithm
Fig. 4. Demodulation result of the signal. (a) Original phase curve; (b) partial enlarged view
Fig. 5. Noise characteristics of SI and RI. (a) Noise floor of the RI; (b) frequency domain responses of SI and RI
Fig. 6. Noise reduction result of 0.01 kHz vibration signal. (a) Phase signal after denoising; (b) frequency domain response of vibration signal
Fig. 7. Noise reduction result of 0.5 kHz vibration signal (a) Phase signal after denoising; (b) frequency domain response of vibration signal
Fig. 8. Noise reduction result of 1 kHz vibration signal. (a) Phase signal after denoising; (b) frequency domain response of vibration signal
Fig. 9. Demodulated waveforms of different types of vibration on UWFBG array. (a) Three-dimensional display of time-domain demodulation signal; (b) three-dimensional top view
Fig. 10. Noise PSD at the end of UWFBG without interference
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