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Underwater surface profiling using laser generated ultrasound.

Takahiro Hayashi1, Wakana Matsumoto1, Naoki Mori1

  • 1Department of Mechanical Engineering Graduate School of Engineering, The University of Osaka, Suita Osaka 565-0871, Japan.

Ultrasonics
|July 15, 2026
PubMed
Summary

This study introduces a hybrid laser-ultrasonic technique for underwater surface profiling. An optimization method was developed to accurately determine sensor position, improving geometric reconstruction of submerged objects.

Keywords:
Laser generated ultrasoundLinear array ultrasonic probeUnderwater surface profiling

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Area of Science:

  • Optics and Photonics
  • Acoustics and Ultrasonics
  • Materials Science

Background:

  • Underwater surface profiling is crucial for inspection and metrology.
  • Traditional methods face challenges in accuracy and resolution in submerged environments.

Purpose of the Study:

  • To develop and validate a hybrid laser-ultrasonic technique for underwater surface profiling.
  • To address and resolve issues related to sensor positioning accuracy in the hybrid system.

Main Methods:

  • Utilized a 532 nm pulsed laser for excitation and a 1 MHz, 64-element ultrasonic linear array probe for detection.
  • Scanned a laser beam over an aluminum extrusion frame submerged in water.
  • Developed an optimization algorithm to precisely determine the ultrasonic array's position relative to the laser path.

Main Results:

  • Successfully reconstructed geometrical features of the aluminum extrusion frame's cross-section.
  • Demonstrated that image alignment across array elements is dependent on accurate positioning.
  • Validated the proposed optimization method for enhancing profiling accuracy.

Conclusions:

  • The hybrid laser-ultrasonic technique shows promise for accurate underwater surface profiling.
  • Accurate sensor positioning is critical for reliable geometric reconstruction.
  • The developed optimization method effectively improves the precision of underwater metrology.