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Location deviation correction method based on cross-correlation spectrum in OFDR.

Hongwei Zhang, Yihua Xia, Zijing Zhang

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    |October 19, 2023
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    Summary
    This summary is machine-generated.

    A novel algorithm compensates for location deviation in optical frequency domain reflectometry (OFDR) measurements. This improves demodulation accuracy and enhances spatial resolution, crucial for precise strain analysis.

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    Area of Science:

    • Optical Engineering
    • Metrology
    • Signal Processing

    Background:

    • Optical Frequency Domain Reflectometry (OFDR) systems are susceptible to location deviations.
    • These deviations, caused by strain or laser instability, lead to significant demodulation errors.
    • Existing compensation methods struggle with complex location deviations.

    Purpose of the Study:

    • To propose and validate a new algorithm for compensating location deviation in OFDR measurements.
    • To enhance the demodulation accuracy and stability of OFDR systems.
    • To improve the spatial resolution and measurement range of OFDR systems.

    Main Methods:

    • Development of a location deviation compensation algorithm utilizing cross-correlation spectrum analysis.
    • Implementation of the Peak-to-Average Ratio (PAR) to assess correlation result quality for compensation.
    • Experimental validation using a strain measurement setup.

    Main Results:

    • The proposed algorithm effectively compensates for complex location deviations.
    • Demodulation errors caused by location deviation were significantly reduced.
    • Spatial resolution improved from 8 cm to 2 cm.
    • Maximum measurement range extended to 5000 µε.

    Conclusions:

    • The cross-correlation spectrum-based algorithm offers superior demodulation accuracy and stability for OFDR.
    • This method provides efficient and robust compensation for location deviations.
    • The enhanced spatial resolution and measurement range open new possibilities for precise strain monitoring.