Journal
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
Volume 472, Issue 2188, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rspa.2015.0500
Keywords
non-destructive testing; time reversal; ultrasonics; arrays; imaging
Categories
Funding
- Engineering and Physical Sciences Research Council [EP/P505747/1]
- Doosan Babcock
- EPSRC [EP/G038627/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [1086858, EP/G038627/1] Funding Source: researchfish
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The non-destructive testing of austenitic welds using ultrasound plays an important role in the assessment of the structural integrity of safety critical structures. The internal microstructure of these welds is highly scattering and can lead to the obscuration of defects when investigated by traditional imaging algorithms. This paper proposes an alternative objective method for the detection of flaws embedded in austenitic welds based on the singular value decomposition of the time-frequency domain response matrices. The distribution of the singular values is examined in the cases where a flaw exists and where there is no flaw present. A lower threshold on the singular values, specific to austenitic welds, is derived which, when exceeded, indicates the presence of a flaw. The detection criterion is successfully implemented on both synthetic and experimental data. The datasets arising from welds containing a flaw are further interrogated using the decomposition of the time-reversal operator (DORT) method and the total focusing method (TFM), and it is shown that images constructed via the DORT algorithm typically exhibit a higher signal-to-noise ratio than those constructed by the TFM algorithm.
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