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Visualization of specular reflections with phase coherence imaging using sub-apertures.

Tony Rasolonirina1, Guillaume Painchaud-April2, Alain Le Duff2

  • 1PULETS, École de technologie supérieure (ÉTS), Montréal, QC H3C 1K3, Canada.

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Summary
This summary is machine-generated.

Phase Coherence Imaging (PCI) struggles to detect specular reflectors. This study introduces a method to select specific sub-apertures (SA) for PCI, enhancing the detection of specular reflections in ultrasonic testing.

Keywords:
Phase Coherence Imaging (PCI)Specular reflectionsSub-apertures (SA)Total Focusing Method (TFM)Vector Coherence Factor (VCF)

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Area of Science:

  • Non-destructive testing
  • Ultrasonic imaging
  • Signal processing

Background:

  • Phased array ultrasonic testing (PAUT) is increasingly replaced by Full Matrix Capture (FMC) based methods like Total Focusing Method (TFM).
  • Phase Coherence Imaging (PCI) offers potential for simpler, more affordable instruments by using only signal phase, but struggles with specular reflector detection.
  • Specular reflectors are missed in amplitude-less PCI because their information is captured by specific sub-apertures (SA), unlike diffractive scatterers.

Purpose of the Study:

  • To analyze specular wave paths for predicting and selecting appropriate emitting and receiving sub-apertures (SA) sensitive to specular reflections in PCI.
  • To demonstrate the effectiveness of the proposed SA selection method for revealing specular information in ultrasonic images.
  • To evaluate PCI's capability as a standalone or complementary solution for non-destructive evaluation.

Main Methods:

  • Analysis of specular wave paths to identify suitable sub-apertures (SA) for emitting and receiving in PCI.
  • Comparison of PCI images generated with the proposed SA selection against traditional methods for notches and side-drilled holes (SDH).
  • Application of the method to realistic fatigue crack scenarios to assess its performance in complex environments.

Main Results:

  • The proposed method successfully reveals specular information by selecting appropriate SAs, enhancing the detection of features like notches and SDHs.
  • While standard PCI highlights diffuse reflections, SA selection in PCI primarily exhibits specular reflections.
  • Reduced aperture size during SA selection can decrease image quality, but the method is valuable for dedicated PCI instruments.

Conclusions:

  • The proposed sub-aperture selection method effectively addresses the limitation of specular reflector detection in Phase Coherence Imaging.
  • PCI, enhanced with this SA selection technique, can serve as a powerful standalone or complementary non-destructive testing method.
  • Vector Coherence Factor (VCF) imaging, achievable with binary acquisitions, offers an alternative for simplified instruments, producing TFM-like images.