Yi Jiang, Shuhuan Zhang. Research Progress on Fiber Optical Laser Interferometry in Signal Demodulation of EFPI Sensor[J]. Laser & Optoelectronics Progress, 2021, 58(13): 1306017
- Laser & Optoelectronics Progress
- Vol. 58, Issue 13, 1306017 (2021)
Fig. 1. Schematic diagram of interference based on Fabry-Perot sensor
![Orthogonal working point and linear interval[24]](/richHtml/lop/2021/58/13/1306017/img_2.jpg)
Fig. 2. Orthogonal working point and linear interval[24]
![Static working point stabilization system[1]](/Images/icon/loading.gif){kind=icon}
Fig. 3. Static working point stabilization system[1]
Fig. 4. Schematic diagram of EFPI sensor system based on PGC demodulation principle
Fig. 5. Schematic diagram of PMDI-PGC demodulation system[26]
Fig. 6. Schematic diagram of PGC-AD-DSM demodulation algorithm[27]
Fig. 7. Schematic diagram of symmetrical demodulation method based on 3×3 coupler[1]
Fig. 8. Experimental setup for interrogating an EFPI by using a three-wavelength method[29]
Fig. 9. Dual-wavelength passive quadrature demodulation system[30]
Fig. 10. Schematic diagram of dual-wavelength orthogonal demodulation algorithm
Fig. 11. Schematic diagram of dual-wavelength quadrature phase compensation demodulation algorithm
Fig. 12. Schematic diagram of dual-wavelength direct current compensation laser interference demodulation algorithm
Fig. 13. Experimental results of the EFPI with a cavity length of 129.946 μm at 1 kHz［34］
Fig. 14. Schematic diagram of three-wavelength passive demodulation laser interference system[35]
Fig. 15. Schematic diagram of three-wavelength passive demodulation laser interference algorithm
Fig. 16. Schematic diagram of experimental results of three-wavelength passive demodulation laser interference［35］
Fig. 17. Schematic diagram of phase shift demodulation algorithm
Fig. 18. Schematic diagram of the experimental results of phase-shift demodulation［37］
Fig. 19. Schematic diagram of three-wavelength symmetric demodulation algorithm
Fig. 20. Demodulation results. (a) Output signal when the cavity length is changed from 301.252 μm to 264.427 μm; (b)‒(d) enlarged images of areas indicated by the solid boxes in Fig. 20(a)［38］
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Table 1. Comparison of four different demodulation methods
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