Heng Liu, Junsong Yu, Shengpeng Wan, Dezhuang Dong, Xinzhong Xiong, Xi Yin, Deng Xiao. Distributed Raman Optical Fiber Sensing System Based on FPGA[J]. Laser & Optoelectronics Progress, 2021, 58(5): 0506006
- Laser & Optoelectronics Progress
- Vol. 58, Issue 5, 0506006 (2021)
Fig. 1. Overall scheme of the system
Fig. 2. Electrical pulse signals generated by FPGA
Fig. 3. Parameters of the electrical pulse signal
Fig. 4. Voltage of Stokes signal
Fig. 5. Display curve on SignalTap II
Fig. 6. Implementation process of FPGA cumulative iterative average filtering
Fig. 7. Flowchart of nonlinear wavelet transform threshold denoizing
Fig. 8. Experimental system diagram
Fig. 9. Effect of cumulative iterative average denoizing. (a) Original signal; (b) 1000 iterations; (c) 8000 iterations; (d) 16000 iterations
Fig. 10. Enlarged effect of cumulative iterative average denoizing. (a) 1000 iterations; (b) 8000 iterations
Fig. 11. Temperature curve after average denoizing of 8000 cumulative iterations
Fig. 12. Temperature curve after threshold denoizing of nonlinear wavelet transform
Fig. 13. Temperature curves after heating. (a) 40 ℃; (b) 60 ℃; (c) 80 ℃
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Table 1. Temperature measurement data
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