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Volumetric imaging with an amplitude-steered array.

Catherine H Frazier1, W Jack Hughes, William D O'Brien

  • 1Bioacoustics Research Laboratory, Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA. hillsley@brl.uiuc.edu

The Journal of the Acoustical Society of America
|January 2, 2003
PubMed
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This study demonstrates volumetric acoustic imaging using a linear amplitude-steered array, reducing electronics needs for underwater object visualization. The proof-of-principle shows successful data collection and image formation for targets like a ladder and pipes.

Area of Science:

  • Underwater acoustics
  • Acoustic imaging systems
  • Array signal processing

Background:

  • Volumetric acoustic imaging is crucial for underwater object visualization.
  • High channel counts in traditional 2D arrays pose implementation challenges.
  • Linear amplitude-steered arrays offer reduced electronics requirements.

Purpose of the Study:

  • To demonstrate the proof of principle for volumetric data collection using a linear amplitude-steered array.
  • To validate associated image formation algorithms for volumetric imaging.
  • To showcase the capability of amplitude-steering for underwater acoustic imaging.

Main Methods:

  • Utilized a vertical linear amplitude-steered array to acquire range and vertical position data via frequency separation.

Related Experiment Videos

  • Employed mechanical steering of the array's mainlobe in azimuth to obtain the third dimension of data.
  • Collected experimental data in a water tank using a 10 cm diameter array operating between 80-304 kHz.

    • Main Results:

    • Successfully collected and displayed volumetric data, demonstrating the amplitude-steering concept.
    • Recognizable images of a ladder's rungs were achieved despite the array's small size for the tested frequencies.
    • Pipes separated in range were clearly visualized in the vertical position versus range image, validating the imaging concept.

    Conclusions:

    • The linear amplitude-steered array and associated algorithms are effective for volumetric acoustic imaging.
    • Amplitude-steering provides a viable method for reducing electronics complexity in volumetric imaging systems.
    • Experimental results align well with simulations, supporting the demonstrated imaging concept.