Abstract
| Language | English |
|---|---|
| Pages | 954-966 |
| Number of pages | 13 |
| Journal | Acta Acustica United with Acustica |
| Volume | 103 |
| Issue number | 6 |
| Early online date | 1 Nov 2017 |
| DOIs | |
| Publication status | Published - 31 Dec 2017 |
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Keywords
- frequency domain analysis
- ultrasonic nondestructive testing
- truncated singular value decomposition
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Application of the factorisation method to limited aperture ultrasonic phased array data. / Tant, Katherine M. M.; Mulholland, Anthony J.; Gachagan, Anthony.
In: Acta Acustica United with Acustica, Vol. 103, No. 6, 31.12.2017, p. 954-966.Research output: Contribution to journal › Article
TY - JOUR
T1 - Application of the factorisation method to limited aperture ultrasonic phased array data
AU - Tant, Katherine M. M.
AU - Mulholland, Anthony J.
AU - Gachagan, Anthony
PY - 2017/12/31
Y1 - 2017/12/31
N2 - This paper puts forward a methodology for applying the frequency domain Factorisation Method to time domain experimental data arising from ultrasonic phased array inspections in a limited aperture setting. Application to both synthetic and experimental data is undertaken and a multi-frequency approach is explored to address the difficulty encountered in empirically choosing the optimum frequency at which to operate. Additionally, a truncated singular value decomposition (TSVD) approach is implemented in the case where the flaw is embedded in a highly scattering medium, to regularise the scattering matrix and minimise the contribution of microstructural noise to the final image. It is shown that when the Factorisation Method is applied to multi-frequency scattering matrices, it can better characterise crack-like scatterers than in the case where the data arises from a single frequency. Finally, a volumetric defect and a lack-of-fusion crack are both successfully reconstructed from experimental data, where the resulting images exhibit only 3\% and 10\% errors respectively in their measurement.
AB - This paper puts forward a methodology for applying the frequency domain Factorisation Method to time domain experimental data arising from ultrasonic phased array inspections in a limited aperture setting. Application to both synthetic and experimental data is undertaken and a multi-frequency approach is explored to address the difficulty encountered in empirically choosing the optimum frequency at which to operate. Additionally, a truncated singular value decomposition (TSVD) approach is implemented in the case where the flaw is embedded in a highly scattering medium, to regularise the scattering matrix and minimise the contribution of microstructural noise to the final image. It is shown that when the Factorisation Method is applied to multi-frequency scattering matrices, it can better characterise crack-like scatterers than in the case where the data arises from a single frequency. Finally, a volumetric defect and a lack-of-fusion crack are both successfully reconstructed from experimental data, where the resulting images exhibit only 3\% and 10\% errors respectively in their measurement.
KW - frequency domain analysis
KW - ultrasonic nondestructive testing
KW - truncated singular value decomposition
UR - http://www.acta-acustica-united-with-acustica.com/journal-information/free-toc-and-abstracts.html
U2 - 10.3813/AAA.919125
DO - 10.3813/AAA.919125
M3 - Article
VL - 103
SP - 954
EP - 966
JO - Acta Acustica United with Acustica
T2 - Acta Acustica United with Acustica
JF - Acta Acustica United with Acustica
SN - 1610-1928
IS - 6
ER -