Laser & Optoelectronics Progress, Volume. 62, Issue 5, 0500001(2025)
Research Progress of Demodulation Method for Fiber Optic Fabry-Perot Ultrasonic Interferometer
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![Self-calibrated interferometric intensity fiber sensor system[24]. (a) Principle diagram; (b) illustration of interference fringes in channel 1 and channel 2](/Images/icon/loading.gif){kind=icon}
Fig. 4. Self-calibrated interferometric intensity fiber sensor system[24]. (a) Principle diagram; (b) illustration of interference fringes in channel 1 and channel 2
Fig. 8. Simulation results of PGC demodulation scheme under 500 Hz vibration signal [dependencies of output signal on measured phase signal amplitude (D) and carrier modulation depth (C)][42]
Fig. 9. Simulation results (dynamic range of PGC demodulation scheme increases with decrease in input signal frequency, low-pass filter passbands is 500 Hz)[42]
Table 1. Summary of six demodulation methods for F-P ultrasound sensor
View tableTable 1. Summary of six demodulation methods for F-P ultrasound sensor
Method Advantage Decotation ultrasound restriction Scene Frequency range Working point control method Simple system， fast demodulation speed Dynamic range is limited， with poor robustness， and achieving rapid dynamic response requires an additional cost of hardware control Slow change signal with less environmental interference 700 Hz‒411 kHz［ 31 ］Double-cavity-length/double-wavelength method Dynamic range and demodulation accuracy， are high and highly robust In order to maintain a strict phase orthogonal relationship， the stability of the light source is high requirements， and the appropriate fitting algorithm should be selected for the demodulation of the size signals High-frequency scenarios with a large dynamic range and high robustness 1 Hz‒100 kHz［ 42 ］Phase-generation carrier method High precision and high robustness System is complex， which requires stable carrier signal and requires high sampling rate High precision， high frequency， complex environmental noise scene 50‒150 kHz［ 44 ］N-step phase method Demodulation speed is fast， with high demodulation accuracy and large dynamic range With the large calculation volume， the rapidly changing signal will reduce the time resolution， which requires the high frequency switching rate of the tunable laser and the good stability of the output light intensity High-precision， high-frequency measurement scene and complex noise environment 1 Hz‒100 kHz［ 53 ］3 × 3 coupler demodulation method High system stability and reliability Three times three coupler is asymmetric， high frequency large dynamic range signals require high sampling rate， sensitive to noise， and not suitable for weak signal detection High stability and high reliability and demodulation scene 100 Hz‒50 kHz［ 54 ］Spectroscopic transformation method High demodulation accuracy and resolution Large computational amount and high cost of obtaining high-speed spectrum Low speed and low frequency scene 20 Hz‒8 kHz［ 61 ］
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Tingwei Xi, Jialin Wen, Yuming Dong, Huanhuan Liu, Tianyu Yang, Bin Yang. Research Progress of Demodulation Method for Fiber Optic Fabry-Perot Ultrasonic Interferometer[J]. Laser & Optoelectronics Progress, 2025, 62(5): 0500001
Paper Information
Category: Reviews
Received: May. 24, 2024
Accepted: Jul. 29, 2024
Published Online: Mar. 7, 2025
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