Chao Han, Binxin Hu, Feng Zhu, Guangdong Song, Hua Zhang, Tieniu Li, Chengquan Yang. Review on Progress of High-Precision Demodulation Algorithm of Fiber Bragg Grating[J]. Laser & Optoelectronics Progress, 2022, 59(13): 1300005
- Laser & Optoelectronics Progress
- Vol. 59, Issue 13, 1300005 (2022)
Fig. 1. Physical structure diagram of fiber grating
Fig. 2. Diagram of fiber grating demodulation system based on tunable laser
Fig. 3. Gaussian fitting model and actual waveform of FBG reflection spectrum. (a) Gaussian fitting model; (b) actual waveform
Fig. 4. Error schematic of two algorithms. (a) Direct peak-finding algorithm; (b) power weighting algorithm
Fig. 5. Schematic diagram of Gaussian fitting algorithm
Fig. 6. Comparison of Gaussian fitting and Gaussian-LM algorithm fitting[56]
Fig. 7. Calibration of true value central wavelength and comparison of Gaussian and Gaussian-LM algorithmsl56]
Fig. 8. Schematic diagram of three-point peak-finding algorithm[58]
Fig. 9. Convolution results of Gaussian template and its first- and second-order differential forms with the original spectral signal[53]
Fig. 10. FBG sensor network demodulation system diagram
Fig. 11. Results of Hilbert transform[64]. (a) Smoothed spectrum signal; (b) Hilbert transformed spectrum signal
Fig. 12. Demodulation results of different types of distortion of FBG[41]. (a) Light intensity attenuation; (b) spectral broadening; (c) spectral asymmetry
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Table 1. Summary of six traditional fiber grating demodulation algorithms
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