Ting Wang, Feng Tian, Wenqing Tang, Yansong Cui. Brillouin Frequency Shift Extraction Method for Distributed Optical Fiber Temperature Sensing System[J]. Laser & Optoelectronics Progress, 2019, 56(17): 170631
- Laser & Optoelectronics Progress
- Vol. 56, Issue 17, 170631 (2019)
Fig. 1. Diagram of optical fiber temperature sensing system based on BOTDA
Fig. 2. Diagram of Brillouin scattering signal
Fig. 3. Algorithm flow of AdaGrad
Fig. 4. Flowchart of extracting BFS by AdaGrad
Fig. 5. Experimental block diagram of fiber optical temperature sensing system based on BOTDA
Fig. 6. Diagram of pulse peak power measurement
Fig. 7. Relationship between pulse peak power and Brillouin scattering signal. (a) Ps=17.3 dBm; (b) Ps=14.5 dBm
Fig. 8. Three dimensional map of Brillouin scattering spectrum
Fig. 9. Two dimensional map of Brillouin scattering signal
Fig. 10. Brillouin scattering spectrum fitting curves with assignment of initial value deviating from real value. (a) General gradient descent method; (b) AdaGrad
Fig. 11. Brillouin scattering spectrum fitting curves with assignment of initial value close to real value. (a) General gradient descent method; (b) AdaGrad
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Table 1. Comparison between LM-LCF and AdaGrad
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