Chao Han, Binxin Hu, Feng Zhu, Guangdong Song, Hua Zhang, Yu Gao. High-Precision Wavelength Demodulation Algorithm of Fiber Bragg Grating Based on Wavelet Denoising[J]. Laser & Optoelectronics Progress, 2022, 59(5): 0506004
- Laser & Optoelectronics Progress
- Vol. 59, Issue 5, 0506004 (2022)
Fig. 1. Gaussian fitting model and actual waveform of the FBG reflection spectrum. (a) Gaussian fitting model; (b) actual waveform
Fig. 2. Correspondence between threshold and correlation coefficient
Fig. 3. Original waveform and the waveform after noise reduction. (a) Original waveform; (b) waveform after noise reduction
Fig. 4. Flow chart of FBG wavelength demodulation algorithm based on wavelet denoising
Fig. 5. Waveform diagram of function f (x)
Fig. 6. Schematic diagram of the FBG demodulation system based on VCSEL
Fig. 7. Fitting results of wavelength and temperature
Fig. 8. Temperature of each phase of the transformer. (a) LV winding of A phase; (b) HV winding of A phase; (c) LV winding of B phase; (d) HV winding of B phase; (e) LV winding of C phase; (f) HV winding of C phase
Fig. 9. Wavelength demodulation standard deviation of different algorithms
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Table 1. Wavelet denoising threshold and correlation coefficient
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Table 2. Average running time of different algorithms
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