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Related Experiment Video

Updated: Feb 21, 2026

Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes
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Long-range OFDR distributed strain sensing based on optimized deskew filter and image denoising methods.

Cailing Fu, Nianqing Zou, Huajian Zhong

    Optics Express
    |February 20, 2026
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces an optimized deskew filter and Gaussian filtering for strain sensing, achieving 5cm resolution over 1.68km. The method significantly enhances peak detection for accurate strain distribution identification.

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    Area of Science:

    • Fiber Optic Sensing
    • Signal Processing
    • Metrology

    Background:

    • Accurate strain sensing over long distances is crucial for structural health monitoring.
    • Traditional methods face limitations in spatial resolution and signal clarity.
    • Nonlinear phase variations and noise hinder precise strain measurements.

    Purpose of the Study:

    • To develop an advanced method for high-resolution, long-range strain sensing.
    • To improve the accuracy and clarity of strain distribution identification.
    • To overcome limitations of existing strain measurement techniques.

    Main Methods:

    • Implementation of an optimized deskew filter utilizing a peak-seeking algorithm.
    • Application of third-order Taylor expansion for nonlinear phase estimation.
    • Gaussian filtering for image denoising to enhance strain signal clarity.
    • Utilizing an auxiliary interferometer for high-accuracy time delay estimation.

    Main Results:

    • Achieved a spatial resolution of 5 cm over a measurement range of 1.68 km.
    • Improved peak amplitude from 5.9 dB to 14.4 dB and reduced peak width from 45 cm to 7 cm at 1212.16 m.
    • Successfully identified strain distribution at 1212 m with 5 cm resolution for strains between 500 µε and 2000 µε.

    Conclusions:

    • The combined optimized deskew filter and Gaussian filtering method significantly enhances strain sensing capabilities.
    • The proposed technique offers high spatial resolution and improved signal quality for long-range measurements.
    • This advancement has potential applications in structural monitoring and precision metrology.