Enhanced ultrasonic detection of near-surface flaws using transverse-wave backscatter

Yuantian Huang, Joseph A Turner, Yongfeng Song, Peijun Ni, Xiongbing Li

Research output: Contribution to journalArticle

Abstract

Diffuse ultrasonic backscatter measurements have been shown to enhance the detection capability of sub-wavelength flaws when combined with extreme value statistics. However, for a normal-incidence immersion measurement, a “dead zone” created by the ring-down of the front-wall echo will hide near-surface flaws. In this article, a pulse-echo transverse wave backscatter measurement is used to detect near-surface flaws under high gain. The approach is validated using a magnesium specimen with side-drilled holes. The confidence bounds of the grain noise from this specimen are given by a transverse-to-transverse scattering model, which takes the grain size distribution and the hexagonal crystal symmetry into account. The upper bound is then treated as a time-dependent threshold for the C-scan. Experiments show that the developed method has good performance for detecting sub-wavelength, near-surface flaws, and can suppress both missed detections and false positives.

Original languageEnglish (US)
Pages (from-to)20-27
Number of pages8
JournalUltrasonics
Volume98
DOIs
StatePublished - Sep 1 2019

Fingerprint

transverse waves
ultrasonics
defects
echoes
high gain
wavelengths
submerging
magnesium
confidence
incidence
grain size
statistics
thresholds
rings
symmetry
pulses
scattering
crystals

Keywords

  • Extreme value statistics
  • Grain size distribution
  • Sub-wavelength near-surface flaws
  • Time-dependent threshold
  • Transverse-to-transverse (T-T) scattering
  • Ultrasonic testing

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

Cite this

Enhanced ultrasonic detection of near-surface flaws using transverse-wave backscatter. / Huang, Yuantian; Turner, Joseph A; Song, Yongfeng; Ni, Peijun; Li, Xiongbing.

In: Ultrasonics, Vol. 98, 01.09.2019, p. 20-27.

Research output: Contribution to journalArticle

Huang, Yuantian ; Turner, Joseph A ; Song, Yongfeng ; Ni, Peijun ; Li, Xiongbing. / Enhanced ultrasonic detection of near-surface flaws using transverse-wave backscatter. In: Ultrasonics. 2019 ; Vol. 98. pp. 20-27.
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