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Validation of Novel Ultrasonic Phased Array Borehole Probe by Using Simulation and Measurement.

Prathik Prabhakara1, Frank Mielentz1, Heiko Stolpe1

  • 1Bundesanstalt für Materialforschung und -Prüfung (BAM), 12205 Berlin, Germany.

Sensors (Basel, Switzerland)
|December 23, 2022
PubMed
Summary

A new ultrasonic borehole probe enhances safety for radioactive waste repositories by detecting cracks and components in salt concrete structures. This non-destructive testing method improves imaging reliability for secure waste disposal.

Keywords:
borehole probeengineered barriermonitoringnon-destructive testing civil engineeringphased array techniqueultrasonic testing

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Area of Science:

  • Geophysics
  • Materials Science
  • Civil Engineering

Background:

  • Low-frequency ultrasonic testing is a standard non-destructive testing (NDT) method in civil engineering.
  • Existing NDT methods require adaptation for in situ quality assurance in challenging environments like radioactive waste repositories.

Purpose of the Study:

  • To develop and validate a novel ultrasonic borehole probe for in situ quality assurance of sealing structures in radioactive waste repositories.
  • To examine salt concrete sealing structures for cracks, delamination, and to localize built-in components.

Main Methods:

  • Development of a phased array borehole probe with 32 transducers utilizing timed excitation for focused sound beams.
  • Validation through beam computation in CIVA software and experimental investigations on a test specimen.
  • Integration with geophysical reconstruction methods for enhanced imaging.

Main Results:

  • The phased array probe demonstrates focused beam capabilities, narrowing the test volume and improving signal-to-noise ratio.
  • Beam computation and experimental results validate the probe's directional characteristics.
  • Optimized radiation patterns are expected to enhance signal quality and imaging reliability.

Conclusions:

  • The novel phased array borehole probe is a promising tool for in situ quality assurance of sealing structures in radioactive waste repositories.
  • Improved imaging reliability is crucial for the safe disposal of radioactive or toxic waste.
  • Further integration with geophysical methods will enhance the probe's effectiveness.