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Automatic Laser-based Geometry Capture for Finite Element Analysis of Weld Beads
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Weibull approximation of LiDAR waveforms for estimating the beam attenuation coefficient.

Martin A Montes-Hugo, Anni K Vuorenkoski, Fraser R Dalgleish

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    This study found that the Weibull scale parameter (P2) from underwater LiDAR accurately estimates beam attenuation coefficient (c) in varying water turbidity. This offers a reliable method for optical remote sensing in aquatic environments.

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    Area of Science:

    • Ocean optics
    • Remote sensing
    • Optical physics

    Background:

    • Water turbidity affects light propagation and is a key parameter in aquatic optics.
    • LiDAR (Light Detection and Ranging) systems offer potential for in-situ and remote sensing of water properties.

    Purpose of the Study:

    • To investigate the relationship between beam attenuation coefficient (c) and Weibull shape parameters derived from underwater LiDAR waveforms.
    • To evaluate the accuracy of LiDAR-derived parameters as proxies for water turbidity.

    Main Methods:

    • Tank experiments were conducted at varying water turbidities.
    • Measurements used the Fine Structure Underwater LiDAR (FSUIL) at 532 nm.
    • Optical inversions were performed using LiDAR data with two fields-of-view and two linear polarizations.

    Main Results:

    • The Weibull scale parameter (P2) demonstrated the strongest covariation with the beam attenuation coefficient (c).
    • P2 proved to be a more accurate proxy for the LiDAR attenuation coefficient compared to other Weibull parameters.
    • The study covered a beam attenuation coefficient range of 0.045-1.52 m-1.

    Conclusions:

    • The Weibull scale parameter (P2) derived from FSUIL waveforms is a robust indicator of water beam attenuation.
    • Underwater LiDAR shows promise for accurate, remote assessment of water optical properties.