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Acta Optica Sinica, Volume. 44, Issue 22, 2204001(2024)

Characteristic Analysis of Adaptive FFT Demodulation Algorithm Applied to Extrinsic Fiber-Optic Fabry-Perot Sensors

Qiong Yao1, Ruizhe Lou1, Zhimin Xie2,3, Zheng Liu1, Ji Xia1, Fuyin Wang1, Shuidong Xiong1, and Hu Chen1、*
Author Affiliations
  • 1College of Meteorology and Oceanography, National University of Defense Technology, Changsha 410073, Hunan , China
  • 2College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150006, Heilongjiang , China
  • 3Naval Military Marine Environmental Construction Office, Beijing 100081, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (8)
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    References (23)
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    Figures & Tables(8)
    Schematic diagram of adaptive FFT demodulation

    Fig. 1. Schematic diagram of adaptive FFT demodulation

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    Variations of fundamental signal amplitude and THD with Ls.(a) Relative amplitude error of fundamental frequency signal; (b) THD

    Fig. 2. Variations of fundamental signal amplitude and THD with Ls.(a) Relative amplitude error of fundamental frequency signal; (b) THD

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    Maximum of demodulated cavity length variation of demodulation algorithm

    Fig. 3. Maximum of demodulated cavity length variation of demodulation algorithm

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    Variations of relative amplitude error of fundamental frequency signal and THD with initial phase. (a) Relative amplitude error of fundamental frequency signal; (b) THD

    Fig. 4. Variations of relative amplitude error of fundamental frequency signal and THD with initial phase. (a) Relative amplitude error of fundamental frequency signal; (b) THD

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    Demodulation performance varying with cavity length. (a) Variations of eigenfrequency and estimation errors with cavity length; (b) comparison of demodulation phase noise

    Fig. 5. Demodulation performance varying with cavity length. (a) Variations of eigenfrequency and estimation errors with cavity length; (b) comparison of demodulation phase noise

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    Relative amplitude error of fundamental frequency signal and THD varying with cavity length. (a) Relative amplitude error of fundamental frequency signal; (b) THD

    Fig. 6. Relative amplitude error of fundamental frequency signal and THD varying with cavity length. (a) Relative amplitude error of fundamental frequency signal; (b) THD

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    Comparison of FFT and adaptive FFT demodulation results. (a) Sensor 1; (b) sensor 2

    Fig. 7. Comparison of FFT and adaptive FFT demodulation results. (a) Sensor 1; (b) sensor 2

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    • Table 1. Simulation parameters settings

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      Table 1. Simulation parameters settings

      SimulationCavity length /μmFrequency /HzCavity length variation /μmInitial phase /radSNR /dB
      Simulation 125063—050
      Simulation 2250——050
      Simulation 3250630.1—50
      Simulation 4—00050
      Simulation 5—630.1050
      Simulation 6250， 35063， 00.1050
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    Qiong Yao, Ruizhe Lou, Zhimin Xie, Zheng Liu, Ji Xia, Fuyin Wang, Shuidong Xiong, Hu Chen. Characteristic Analysis of Adaptive FFT Demodulation Algorithm Applied to Extrinsic Fiber-Optic Fabry-Perot Sensors[J]. Acta Optica Sinica, 2024, 44(22): 2204001

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    Paper Information

    Category: Detectors

    Received: Jun. 13, 2024

    Accepted: Jul. 25, 2024

    Published Online: Nov. 20, 2024

    The Author Email: Hu Chen (chenhu19861124@163.com)

    DOI:10.3788/AOS241166

    CSTR:32393.14.AOS241166

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology