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Compressed-sensing fiber-optic white light interferometry.

Qiang Liu, Shi-Min Li, Da-Peng Zhou

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    This summary is machine-generated.

    We introduce a dynamic fiber-optic white light interferometry (WLI) method using compressed sensing (CS). This technique enables high-speed, nanometer-scale vibration measurements, offering an alternative to traditional dynamic interferometry.

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    Area of Science:

    • Optics and Photonics
    • Signal Processing
    • Vibration Measurement

    Background:

    • Dynamic fiber-optic white light interferometry (WLI) is crucial for precise measurements.
    • Traditional methods face limitations in acquisition speed and complexity.
    • Compressed sensing (CS) offers potential for efficient signal acquisition.

    Purpose of the Study:

    • To propose and validate a novel dynamic fiber-optic WLI system.
    • To leverage the compressed-sensing principle for enhanced spectral acquisition.
    • To achieve high-speed, nanometer-scale vibration detection.

    Main Methods:

    • A dynamic WLI system based on the compressed-sensing (CS) principle was developed.
    • Time-varying interference spectra from a Fabry-Perot cavity under vibration were treated as 2D signals.
    • A programmable semiconductor laser source enabled compressive sampling of spectral data.
    • CS reconstruction algorithms were applied to recover the spectral information.

    Main Results:

    • The proposed method achieved a spectrum acquisition rate of up to 10 MHz.
    • Numerical simulations confirmed the effectiveness of the CS-based approach.
    • Experiments demonstrated nanometer-scale vibration measurement capabilities.
    • The system provides a viable alternative to conventional laser-based dynamic interferometry.

    Conclusions:

    • The dynamic fiber-optic WLI based on CS is a highly effective technique.
    • It enables high-speed acquisition rates for dynamic spectral analysis.
    • This method offers a promising advancement for precision vibration sensing applications.