Shuhuan Zhang, Yi Jiang. Phase Demodulation Method for Non-Periodic Signal in Extrinsic Fabry-Perot Interferometric Sensor[J]. Acta Optica Sinica, 2022, 42(9): 0906002
- Acta Optica Sinica
- Vol. 42, Issue 9, 0906002 (2022)
Fig. 1. Schematic diagram of three wavelength phase compensation demodulation system
Fig. 2. Theoretical demodulation error when cavity length of EFPI sensor varies in the range of 92.1983--112.1983 μm
Fig. 3. Experimental results of EFPI sensor with cavity length of 107.8886 μm under aperiodic dynamic signal. (a) Three interferometric signals; (b) demodulated output signal
Fig. 4. Demodulation results before and after phase compensation during pressure rise
Fig. 5. Demodulation results before and after phase compensation during pressure drop
Fig. 6. Comparison of demodulation accuracies of three laser interferometric demodulation methods. (a) Cavity length variation; (b) relative error
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Table 1. Variation of cavity length under different pressures
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Table 2. Comparison of three demodulation schemes
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