caa a22 4500 60617317X CHVBK 20210128100732.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s10921-015-0289-5 doi (NATIONALLICENCE)springer-10.1007/s10921-015-0289-5 Improvement of SAFT by Implementation of Approximate Wave Solution in Fluid-Solid Two-Phase Media: A Case Study on Imaging of Aluminum Rod with Side-Drilled Holes [Elektronische Daten] [Worawit Padungsriborworn, Akira Furukawa, Sohichi Hirose] In ultrasonic testing, Synthetic Aperture Focusing Technique (SAFT) is a signal processing technique to produce flaw images by superposing of A-scan waveforms. With rapid development in computing technology, recently, SAFT has become easier in data acquisition and faster in computation. However, additional signal processing techniques may be integrated into SAFT to get ultrasound image with higher resolution. Wave theory is one of the most important keys in SAFT improvement since it can lead to better understanding of ultrasonic wave phenomena. In this paper, the approximate wave solution (AWS) in fluid-solid two-phase media is used to compute the beam radiations inside target of inspection. Multiplying A-scan waveforms by the ultrasonic beam radiations obtained by AWS, wave diffraction characteristics which are spatial functions between transducer and target are incorporated into the SAFT. The performance of the improved SAFT, so-called AWS-SAFT, is experimentally tested in ultrasonic imaging of a side-drilled hole (SDH) in an immersed rod. It is shown that AWS-SAFT can improve a flaw image, especially in that a flaw image with narrower side lobes is obtained, and artifacts due to L-mode are eliminated in T-mode SAFT images. Eventually, an efficient way in using AWS-SAFT to obtain an accurate ultrasound image of an immersed rod with SDHs is proposed and tested. Springer Science+Business Media New York, 2015 SAFT nationallicence Phased-array transducer nationallicence Ultrasonic beam radiation nationallicence Water immersion test nationallicence Padungsriborworn Worawit Department of Civil Engineering, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1-W8-301, Ookayama, Meguro-ku, 152-8550, Tokyo, Japan aut Furukawa Akira Department of Mechanical and Environmental Informatics, Graduate School of Information Science and Engineering, Tokyo Institute of Technology, 2-12-1-W8-301, Ookayama, Meguro-ku, 152-8550, Tokyo, Japan aut Hirose Sohichi Department of Mechanical and Environmental Informatics, Graduate School of Information Science and Engineering, Tokyo Institute of Technology, 2-12-1-W8-301, Ookayama, Meguro-ku, 152-8550, Tokyo, Japan aut Journal of Nondestructive Evaluation Springer US; http://www.springer-ny.com 34/2(2015-06-01), 1-13 0195-9298 34:2<1 2015 34 10921 https://doi.org/10.1007/s10921-015-0289-5 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10921-015-0289-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Padungsriborworn Worawit Department of Civil Engineering, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1-W8-301, Ookayama, Meguro-ku, 152-8550, Tokyo, Japan aut NATIONALLICENCE 700 1- Furukawa Akira Department of Mechanical and Environmental Informatics, Graduate School of Information Science and Engineering, Tokyo Institute of Technology, 2-12-1-W8-301, Ookayama, Meguro-ku, 152-8550, Tokyo, Japan aut NATIONALLICENCE 700 1- Hirose Sohichi Department of Mechanical and Environmental Informatics, Graduate School of Information Science and Engineering, Tokyo Institute of Technology, 2-12-1-W8-301, Ookayama, Meguro-ku, 152-8550, Tokyo, Japan aut NATIONALLICENCE 773 0- Journal of Nondestructive Evaluation Springer US; http://www.springer-ny.com 34/2(2015-06-01), 1-13 0195-9298 34:2<1 2015 34 10921