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Related Experiment Videos

Temporal and spatial apodization in defocused acoustic transmission microscopy.

E Twerdowski1, W Grill

  • 1Institute of Experimental Physics II, University of Leipzig, Linnèstr. 5, D-04103 Leipzig, Germany. twerdowski@physik.uni-leipzig.de

Ultrasonics
|August 30, 2005
PubMed
Summary

Achieving a line-shaped point spread function (PSF) in acoustic microscopy is challenging due to dominant edge waves from transducers. Pulse length and time gating influence the obtainable PSF, impacting acoustic transmission line tomography.

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Area of Science:

  • Acoustic microscopy
  • Wave physics
  • Materials characterization

Background:

  • Acoustic microscopy utilizes ultrasound waves for imaging and material property measurements.
  • A line-shaped point spread function (PSF) is desirable for specific applications like acoustic transmission line tomography.
  • Achieving a precise PSF is crucial for accurate spatially resolved velocity measurements in solids.

Purpose of the Study:

  • To investigate the feasibility of implementing an acoustic microscope with a line-shaped PSF using two non-confocally adjusted spherical transducers.
  • To analyze the factors affecting the achievable PSF, particularly the influence of edge waves and signal acquisition.
  • To determine the constraints on obtaining a line-shaped PSF in acoustic transmission microscopy.

Main Methods:

Related Experiment Videos

  • Employing two non-confocally adjusted spherical transducers in a transmission acoustic microscope setup.
  • Utilizing time-selective signal acquisition to restrict ultrasound wave paths.
  • Investigating the impact of exciting toneburst length and time gate position on the PSF.

Main Results:

  • The dominant signal contribution originates from edge waves from the transducer rim, not the direct wave.
  • Achieving a purely line-shaped PSF is constrained by these edge waves.
  • A line-shaped PSF is impossible with long exciting tonebursts due to strong edge wave contributions.

Conclusions:

  • Edge waves significantly limit the ability to achieve a line-shaped PSF in defocused acoustic transmission microscopy.
  • The length of the exciting pulse and the placement of the time gate are critical parameters influencing the PSF.
  • Further optimization is needed to overcome edge wave effects for applications requiring a line-shaped PSF.