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A study of two-dimensional array transducers for limited diffraction beams.

J Y Lu1, J F Greenleaf

  • 1Dept. of Physiol. and Biophys., Mayo Clinic, Rochester, MN.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|January 1, 1994
PubMed
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Steering limited diffraction beams using 2D arrays avoids mechanical steering and preserves beam profiles. This research explores electronic multiplexing and element spacing for improved beam control in applications like medical imaging.

Area of Science:

  • Physics
  • Acoustics
  • Optics

Background:

  • Limited diffraction beams (LDBs) like Bessel beams and X waves offer extended depth of field and depth-independent properties.
  • Current methods for generating LDBs require mechanical steering of annular array transducers, limiting their practical application.
  • LDBs have potential applications in medical imaging, material evaluation, and electromagnetics.

Purpose of the Study:

  • To investigate the feasibility of electronically steering LDBs using two-dimensional (2D) array transducers.
  • To analyze methods for compensating effective aperture reduction during steering to maintain beam profile integrity.
  • To propose techniques for simplifying electronic multiplexing and evaluate the impact of array element parameters on beam characteristics.

Main Methods:

Related Experiment Videos

  • Simulations and analysis of beam steering using 2D array transducers.
  • Development of compensation strategies for effective aperture reduction.
  • Investigation of electronic multiplexing schemes for array elements.
  • Parametric study of interelement distance and element size effects on sidelobes and grating lobes.

Main Results:

  • Electronic steering of LDBs with 2D arrays is feasible with minimal beam distortion when aperture reduction is compensated.
  • Proposed methods can reduce the complexity of electronic multiplexing.
  • Interelement distance and element size influence sidelobes and grating lobes similarly to conventional beams during steering.

Conclusions:

  • 2D array transducers offer a viable alternative to mechanical steering for LDBs, enabling electronic control and maintaining beam quality.
  • Optimized array element design and electronic control are crucial for effective LDB steering.
  • This approach enhances the applicability of LDBs in various scientific and technological fields.