Li Wei, Zhang Yongjia. Enhanced Phase Sensitive Optical Time-Domain Reflectometer Vibration Sensing System Based on Weak Grating Array[J]. Chinese Journal of Lasers, 2018, 45(8): 810001
- Chinese Journal of Lasers
- Vol. 45, Issue 8, 810001 (2018)
Fig. 1. Schematic of enhanced ?-OTDR vibration sensing system based on weak fiber Bragg grating array
Fig. 2. Schematic of reflection light interference from fiber Bragg grating array
Fig. 3. Demodulation structure of enhanced ?-OTDR vibration sensing signals based on fiber Bragg grating array
Fig. 4. Spectra of demodulated signals at different frequencies when voltage of sinusoidal driving signal is 0.53 V. (a) Low frequency; (b) high frequency
Fig. 5. Relation between driving voltage amplitude and demodulated signal amplitude at different frequencies. (a) 20 Hz; (b) 40 Hz; (c) 80 Hz; (d) 100 Hz; (e) 200 Hz; (f) 400 Hz
Fig. 6. Comparison between demodulated signal of sensing system and test signal of geophone at different frequencies. (a) 10 Hz; (b) 20 Hz; (c) 60 Hz; (d) 80 Hz; (e) 200 Hz; (f) 500 Hz
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