Fig. 1. FBG displacement sensor demodulation system

Fig. 2. Generation system frame of sawtooth wave

Fig. 3. Flow chart of wavelet threshold denoising

Fig. 4. Effects of wavelet threshold denoising. (a) Original signal; (b) wavelet threshold denosing signal; (c) partial magnification of some peak point in a grating channel for original signal; (d) partial magnification of the peak point for denoising signal

Fig. 5. Ideal peak shape and double peak shape. (a) Ideal peak shape; (b) double peak shape

Fig. 6. Invalid peak shape and left peakshape. (a) Invalid peak shape; (d) left peak shape

Fig. 7. Schematic diagrams of Gaussian models. (a) Standard Gaussian curve; (b) asymmetric Gaussian curve

Fig. 8. Effects of Gaussian fitting algorithm. (a) Total peak points after Gaussian fitting and the second processing; (b) partial magnification of some peak point

Fig. 9. Photo of FBG demodulation platform

Fig. 10. Displacement sensor waveform display