Total focussing method for volumetric imaging in immersion non destructive evaluation

R.L. O'Leary, A. Tweedie, G. Harvey, A. Gachagan, C. Holmes, P. Wilcox, B. Drinkwater

Research output: Contribution to conferencePaper

3 Citations (Scopus)
253 Downloads (Pure)

Abstract

This paper describes the use of a 550 (25x22) element
2MHz 2D piezoelectric composite array in immersion mode to
image an aluminum test block containing a collection of artificial
defects. The defects included a 1mm diameter side-drilled hole, a
collection of 1mm slot defects with varying degrees of skew to the
normal and a flat bottomed hole. The data collection was carried
out using the full matrix capture; a scanning procedure was
developed to allow the operation of the large element count array
through a conventional 64-channel phased array controller. A 3D
TFM algorithm capable of imaging in a dual media environment
was implemented in MATLAB for the offline processing the raw
scan data. This algorithm facilitates the creation of 3D images of
defects while accounting for refraction effects at material
boundaries. In each of the test samples interrogated the defects,
and their spatial position, are readily identified using TFM.
Defect directional information has been characterized using
VTFM for defect exhibiting angles up to and including 45o of
skew.
Original languageEnglish
Pages1017-1020
Number of pages4
DOIs
Publication statusPublished - 2007
Event2007 IEEE International Ultrasonics Symposium - New York, United States
Duration: 28 Oct 200731 Oct 2007

Conference

Conference2007 IEEE International Ultrasonics Symposium
CountryUnited States
CityNew York
Period28/10/0731/10/07

Fingerprint

Imaging techniques
Defects
Refraction
MATLAB
Scanning
Aluminum
Controllers
Composite materials
Processing

Keywords

  • piezoelectric composite arrays
  • signal processing
  • total foccusing method
  • non-destructive evaluation

Cite this

O'Leary, R. L., Tweedie, A., Harvey, G., Gachagan, A., Holmes, C., Wilcox, P., & Drinkwater, B. (2007). Total focussing method for volumetric imaging in immersion non destructive evaluation. 1017-1020. Paper presented at 2007 IEEE International Ultrasonics Symposium, New York, United States. https://doi.org/10.1109/ULTSYM.2007.259
O'Leary, R.L. ; Tweedie, A. ; Harvey, G. ; Gachagan, A. ; Holmes, C. ; Wilcox, P. ; Drinkwater, B. / Total focussing method for volumetric imaging in immersion non destructive evaluation. Paper presented at 2007 IEEE International Ultrasonics Symposium, New York, United States.4 p.
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O'Leary, RL, Tweedie, A, Harvey, G, Gachagan, A, Holmes, C, Wilcox, P & Drinkwater, B 2007, 'Total focussing method for volumetric imaging in immersion non destructive evaluation' Paper presented at 2007 IEEE International Ultrasonics Symposium, New York, United States, 28/10/07 - 31/10/07, pp. 1017-1020. https://doi.org/10.1109/ULTSYM.2007.259

Total focussing method for volumetric imaging in immersion non destructive evaluation. / O'Leary, R.L.; Tweedie, A.; Harvey, G.; Gachagan, A.; Holmes, C.; Wilcox, P.; Drinkwater, B.

2007. 1017-1020 Paper presented at 2007 IEEE International Ultrasonics Symposium, New York, United States.

Research output: Contribution to conferencePaper

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AB - This paper describes the use of a 550 (25x22) element2MHz 2D piezoelectric composite array in immersion mode toimage an aluminum test block containing a collection of artificialdefects. The defects included a 1mm diameter side-drilled hole, acollection of 1mm slot defects with varying degrees of skew to thenormal and a flat bottomed hole. The data collection was carriedout using the full matrix capture; a scanning procedure wasdeveloped to allow the operation of the large element count arraythrough a conventional 64-channel phased array controller. A 3DTFM algorithm capable of imaging in a dual media environmentwas implemented in MATLAB for the offline processing the rawscan data. This algorithm facilitates the creation of 3D images ofdefects while accounting for refraction effects at materialboundaries. In each of the test samples interrogated the defects,and their spatial position, are readily identified using TFM.Defect directional information has been characterized usingVTFM for defect exhibiting angles up to and including 45o ofskew.

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O'Leary RL, Tweedie A, Harvey G, Gachagan A, Holmes C, Wilcox P et al. Total focussing method for volumetric imaging in immersion non destructive evaluation. 2007. Paper presented at 2007 IEEE International Ultrasonics Symposium, New York, United States. https://doi.org/10.1109/ULTSYM.2007.259