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Related Experiment Videos

Imaging with lithium niobate/epoxy composites.

N Schmarje1, J F Saillant, K J Kirk

  • 1Microscale Sensors, School of ICT (EEP), University of Paisley, High Street, Paisley PA1 2BE, UK. nicole.schmarje@paisley.ac.uk

Ultrasonics
|March 30, 2004
PubMed
Summary
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Lithium niobate (LiNbO3) composites show enhanced electromechanical coupling for high-temperature non-destructive testing transducers. These composites successfully detected cracks in steel, demonstrating their practical application potential.

Area of Science:

  • Materials Science
  • Acoustics
  • Non-Destructive Testing

Background:

  • Lithium niobate (LiNbO3) offers high Curie temperature for high-temperature applications.
  • Commercial use of LiNbO3 is limited by low electromechanical coupling coefficients.
  • LiNbO3 composites are explored to overcome limitations for high-temperature transducers.

Purpose of the Study:

  • Investigate LiNbO3 composites for high-temperature transducer applications.
  • Characterize the performance of 1-3 connectivity LiNbO3-epoxy composites.
  • Evaluate the potential of these composites in non-destructive testing.

Main Methods:

  • Fabrication of LiNbO3-epoxy composites with 33% and 54% volume fractions.
  • Electrical impedance measurements and comparison with modelled characteristics.

Related Experiment Videos

  • Finite element modeling for accurate parameter prediction.
  • Functional measurements using a linear array for crack detection.

    • Main Results:

    • Significant improvement in thickness mode electromechanical coupling coefficient (kT=0.32 from kT=0.17).
    • Accurate prediction of many composite parameters using modeling.
    • Finite element modeling showed higher accuracy than 1D models.
    • Successful detection and visualization of crack tips in steel blocks using a time-of-flight diffraction B-scan.

    Conclusions:

    • LiNbO3 composites enhance electromechanical coupling for high-temperature transducer applications.
    • Finite element modeling is crucial for accurate composite parameter prediction.
    • The developed composite array effectively performs non-destructive testing functions.
    • LiNbO3 composites show promise for advanced non-destructive testing systems.