This paper presents how to compute the envelope of a total focusing method (TFM) image and the benefits of using this TFM envelope as part of a code-compliant solution. The TFM envelope is obtained by computing the norm of two different TFM images; namely, a first TFM image computed using the standard acquired full matrix capture (FMC), and a second TFM image computed using the Hilbert-transformed FMC. The resulting TFM envelope image provides a better basis for the amplitude-based sizing technique, as it is more robust to amplitude variation compared with a standard oscillatory TFM image at an identical grid resolution. Therefore, with respect to the standard oscillatory TFM, a coarser grid resolution can be set for the TFM envelope, consequently reducing the total amount of computation effort and ultimately increasing the resulting acquisition rate.
Ahmad, R., T. Kundu, and D. Placko, 2005, “Modeling of Phased Array Transducers,” The Journal of the Acoustical Society of America, Vol. 117, No. 4, pp. 1762–1776, https://doi.org/10.1121/1.1835506.
ASME, 2019a, “ASME BPVC.V Article 4 Mandatory Appendix XI Full Matric Capture,” American Society of Mechanical Engineers, New York, NY.
ASME, 2019b, “ASME BPVC.V Article 4 Nonmandatory Appendix F – Examination of Welds Using Full Matric Capture,” American Society of Mechanical Engineers, New York, NY.
Badeau, N., A. Le Duff, and C.-H. Kwan, 2020, “TFM Amplitude Fidelity Reading,” white paper, available at https: //www.olympus-ims.com/en/resources/white-papers/tfm-amplitude-fidelity-reading/?.
Bond, L.J., 2018, “Fundamentals of Ultrasonic Inspection,” ASM Handbook: Nondestructive Evaluation of Materials, Vol. 17, pp. 155–168.
Clay, A.C., S.-C. Wooh, L. Azar, and J.-Y. Wang, 1999, “Experimental Study of Phased Array Beam Steering Characteristics,” Journal of Nondestructive Evaluation, Vol. 18, pp. 59–77.
Drinkwater, B.W., and P.D. Wilcox, 2006, “Ultrasonic Arrays for Non-Destructive Evaluation: A Review,” NDT&E International, Vol. 39, No. 7, pp. 525–541, https://doi.org/10.1016/j.ndteint.2006.03.006.
Gabor, D., 1946, “Theory of Communication, Part 1: The Analysis of Information,” Journal of the Institution of Electrical Engineers, Vol. 93, No. 26, pp. 429–441, https://doi.org/10.1049/ji-3-2.1946.0074.
Holmes, C., B.W. Drinkwater, and P.D. Wilcox, 2005, “Post-Processing of the Full Matrix of Ultrasonic Transmit–Receive Array Data for Non-Destructive Evaluation,” NDT&E International, Vol. 38, No. 8, pp. 701–711, https://doi.org/10.1016/j.ndteint.2005.04.002.
Holmes, C., B.W. Drinkwater, and P.D. Wilcox, 2008, “Advanced Post-Processing for Scanned Ultrasonic Arrays: Application to Defect Detection and Classification in Non-Destructive Evaluation,” Ultrasonics, Vol. 48, No. 6–7, pp. 636–642, https://doi.org/10.1016/j.ultras.2008.07.019.
Lee, J.-H., and S.-W. Choi, 2000, “A Parametric Study of Ultrasonic Beam Profiles for a Linear Phased Array Transducer,” IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, Vol. 47, No. 3, pp. 644–650, https://doi.org/10.1109/58.842052.
Mahaut, S., O. Roy, C. Beroni, and B. Rotter, 2002, “Development of Phased Array Techniques to Improve Characterization of Defect Located in a Component of Complex Geometry,” Ultrasonics, Vol. 40, No. 1–8, pp. 165–169, https://doi.org/10.1016/S0041-624X(02)00131-2.
Mondal, S.C., P.D. Wilcox, and B.W. Drinkwater, 2005, “Design of Two-Dimensional Ultrasonic Phased Array Transducers,” Journal of Pressure Vessel Technology, Vol. 127, No. 3, pp. 336–344, https://doi.org/10.1115/1.1991873.
Song, S.-J., H.J. Shin, and Y.H. Jang, 2002, “Development of an Ultrasonic Phased Array System for Nondestructive Tests of Nuclear Power Plant Components,” Nuclear Engineering and Design, Vol. 214, No. 1–2, pp. 151–161, https://doi.org/10.1016/S0029-5493(02)00024-9.
Wilcox, P.D., C. Holmes, and B.W. Drinkwater, 2006, “Exploiting the Full Data Set from Ultrasonic Arrays by Post-Processing,” AIP Conference Proceedings, Vol. 820, pp. 845–852, https://doi.org/10.1063/1.2184614.
Wooh, S.-C., and Y. Shi, 1998, “Influence of Phased Array Element Size on Beam Steering Behavior,” Ultrasonics, Vol. 36, No. 6, pp. 737–749, https://doi.org/10.1016/S0041-624X(97)00164-9.
Zhang, J., B.W. Drinkwater, and P.D. Wilcox, 2011, “Effects of Array Transducer Inconsistencies on Total Focusing Method Imaging Performance,” NDT&E International, Vol. 44, No. 4, pp. 361–368, https://doi.org/10.1016/j.ndteint.2011.03.001.
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