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Wind and refractive-turbulence sensing using crossed laser beams.

T I Wang, S F Clifford, G R Ochs

    Applied Optics
    |February 6, 2010
    PubMed
    Summary

    This study uses a crossed-path technique to measure atmospheric turbulence, providing path profiles of optical properties sensitive to wind and turbulence strength. The method offers adaptable resolution and insensitivity to refractive index variations.

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    Area of Science:

    • Atmospheric Optics
    • Optical Propagation
    • Turbulence Measurement

    Background:

    • Optical propagation through atmospheric turbulence is sensitive to refractive turbulence strength and wind.
    • Quantities like log-amplitude variance and covariance are key indicators of turbulence effects.

    Purpose of the Study:

    • To exploit the sensitivity of optical propagation to atmospheric turbulence.
    • To derive path profiles of refractive turbulence and wind using a novel technique.

    Main Methods:

    • Utilized a crossed-path technique to measure optical propagation.
    • Derived path profiles of log-amplitude variance and covariance.
    • Varied receiver and transmitter separations to adjust path resolution.

    Main Results:

    • The crossed-path technique provides path profiles insensitive to spatial spectrum variations.
    • Path resolution is adjustable by altering optical path geometry.
    • Experimental results on horizontal paths pave the way for vertical path profiling.

    Conclusions:

    • The crossed-path technique is effective for profiling atmospheric turbulence.
    • The method's adaptability and robustness make it suitable for various atmospheric conditions.
    • Feasibility of profiling vertical paths with passive sources is indicated.

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