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Intercalibration method for underwater three-dimensional mapping laser line scan systems.

K D Moore

    Applied Optics
    |March 28, 2008
    PubMed
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    This study introduces a novel method for calibrating underwater laser scanners using a single target range. The technique leverages seawater

    Area of Science:

    • Oceanography
    • Optical Engineering
    • Metrology

    Background:

    • Underwater bathymetric laser scanners require precise calibration for accurate depth measurements.
    • Traditional calibration methods often involve multiple target ranges, complicating in-situ operations.
    • Existing systems face challenges in accurately parameterizing source-receiver characteristics and geometric layouts.

    Purpose of the Study:

    • To present an absolute calibration method for a new family of underwater bathymetric laser scanner systems.
    • To enable calibration using a single target range by utilizing the refractive index of seawater.
    • To develop a theoretical model for characterizing and optimizing future laser scanner designs.

    Main Methods:

    • Depth calculation via triangulation using the laser source, receiver, and a single scanned spot on the target.

    Related Experiment Videos

  • Modulation of triangulation parameters with seawater's refractive index for calibration, avoiding multiple target ranges.
  • Initial disregard for receiver characteristics to determine scanner parameters, followed by receiver calibration.

    • Main Results:

    • Achieved absolute bathymetric calibration in situ through high-resolution parameterization of system components.
    • Demonstrated accurate positioning of the laser spot, enabling precise receiver calibration.
    • Developed a theoretical model applicable to future underwater laser scanner design optimization.

    Conclusions:

    • The proposed intercalibration method offers a robust and efficient approach to calibrating underwater laser scanners.
    • The single-target-range calibration technique simplifies in-situ operations and enhances accuracy.
    • The derived theoretical model provides a foundation for advancing underwater bathymetric measurement technologies.