Fig. 1. Schematic diagram of a WLI-based demodulation system

Fig. 2. Signal timing diagram of high-speed white light interferometric demodulation system

Fig. 3. Etalon signal

Fig. 4. Etalon signal

Fig. 5. The structure of the EFPI sensor

Fig. 6. Variation of trough wavelength value

Fig. 7. EFPI sensor's initial cavity length measured at room temperature

Fig. 8. Measured cavity length after changing the initial cavity length by EFPI

Fig. 9. Vibration test platform

Fig. 10. Vibration signal measurement results