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Wave guide imaging through Time Domain Topological Energy.

V Gibiat1, P Sahuguet

  • 1Université de Toulouse Phase, 118 route de Narbonne, 31062 Toulouse Cedex 9, France. gibiat@cict.fr

Ultrasonics
|October 28, 2009
PubMed
Summary

Time Domain Topological Energy (TDTE) imaging uses reflected ultrasonic fields for defect detection. This method, utilizing a single transducer in waveguides, demonstrates effective re-focalization and imaging capabilities.

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Area of Science:

  • Non-Destructive Testing (NDT)
  • Ultrasonic Imaging
  • Mathematical Optimization

Background:

  • Time Domain Topological Energy (TDTE) is an imaging technique utilizing reflected ultrasonic fields.
  • It involves numerical simulations of forward and adjoint problems within a reference medium.
  • TDTE is related to topological sensitivity and mathematical optimization principles.

Purpose of the Study:

  • To investigate the application of TDTE imaging using a single transducer in waveguide environments.
  • To explore the potential of waveguide reverberation properties for enhanced re-focalization.
  • To demonstrate the efficacy of TDTE with a single transducer for complex targets and conditions.

Main Methods:

  • Utilizing reflected ultrasonic fields recorded by boundary transducers.
  • Computing acoustic fields via forward and adjoint numerical problems.
  • Modeling TDTE with a single transducer at the waveguide end, leveraging virtual sources from boundaries.

Main Results:

  • Successful imaging of targets with increasing complexity using TDTE and a single transducer.
  • Demonstration of re-focalization capabilities analogous to Time Reversal concepts.
  • Validation of the single-transducer approach through numerical and experimental results.

Conclusions:

  • TDTE imaging is effective with a single transducer in waveguides.
  • Waveguide boundaries act as virtual arrays, enhancing imaging.
  • The method shows promise for NDT applications in complex environments.