Fig. 1. Schematic of a three-wavelength demodulation system applied to optical fiber EFPI sensors

Fig. 2. Calibration effect diagram using amplitude signal normalization method

Fig. 3. Flowchart of the three-wavelength calibration process

Fig. 4. Simulation results with introduced three-path calibration coefficient errors

Fig. 5. Simulation results after completing calibration using the three-wavelength calibration method

Fig. 6. Calibration error under different excitation amplitudes

Fig. 7. Calibration error under different power noise levels

Fig. 8. Flowof the calibration process for fiber optic EFPI sensors using the three-wavelength calibration method

Fig. 9. Demodulation results of fiber optic EFPI sensor after calibration with three-wavelength coefficients