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Coded waveforms for optimised air-coupled ultrasonic nondestructive evaluation.

David Hutchins1, Pietro Burrascano2, Lee Davis1

  • 1School of Engineering, University of Warwick, Coventry CV4 7AL, UK.

Ultrasonics
|April 15, 2014
PubMed
Summary

This study explores coded waveforms for air-coupled ultrasound to improve signal quality in nondestructive evaluation. The best waveform depends on available bandwidth and measurement type for clearer results.

Keywords:
Air-coupledCoded waveformsCross-correlationNon-destructive evaluationUltrasonic

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Area of Science:

  • Ultrasonic testing
  • Materials science
  • Signal processing

Background:

  • Air-coupled ultrasound faces low signal-to-noise ratios due to acoustic mismatch.
  • Nondestructive evaluation (NDE) requires robust signal processing for air-coupled systems.

Purpose of the Study:

  • Investigate coded waveforms for air-coupled ultrasonic NDE.
  • Enhance signal processing through pulse compression techniques.

Main Methods:

  • Analysis of swept-frequency and binary modulated coded waveforms.
  • Comparison of waveform performance in noisy environments.

Main Results:

  • Coded waveforms significantly improve signal quality in air-coupled ultrasound.
  • Optimal waveform selection is contingent on bandwidth and measurement specifics.

Conclusions:

  • Coded waveforms are crucial for effective air-coupled ultrasonic NDE.
  • Tailoring waveform choice to application parameters maximizes performance.