TY - CHAP
T1 - Dual mode inspection using guided waves and phased array ultrasonics from a single transducer
AU - Tzaferis, Konstantinos
AU - Tabatabaeipour, Seyed Morteza
AU - Dobie, Gordon
AU - Pierce, Gareth
AU - Lines, David
AU - MacLeod, Charles Norman
AU - Gachagan, Anthony
PY - 2022/6/22
Y1 - 2022/6/22
N2 - Asset inspection of large structures such as storage tanks in the oil, gas and petrochemical industry is a challenging and time-consuming process. Compared to the state-of-the-art inspection methods of these structures using ultrasonic bulk wave phased array techniques, guided waves provide a mechanism for monitoring inaccessible areas and increasing the testing range to speed up the inspection process. Combining these two approaches, an efficient inspection scheme can be achieved. For this purpose, in this work, the possibility of exciting a single higher order guided wave mode at a low dispersion region is examined, using a conventional linear phased array on a 10 mm thick sample. An analytical model based on modal analysis is derived. Then, the time delays across each element of the array are optimally selected and a necessary condition on the pitch is provided, to enhance the purity of the desired mode. The results are promising, illustrating that single mode excitation is possible at high frequency-thickness products, greater or equal than 15 MHz⋅mm. Furthermore, the phased array transducer allows for dynamic mode selection capabilities; that is, feeding the appropriate excitation signals on each channel, different modes can be excited, without having to physically alter the transducer configuration.
AB - Asset inspection of large structures such as storage tanks in the oil, gas and petrochemical industry is a challenging and time-consuming process. Compared to the state-of-the-art inspection methods of these structures using ultrasonic bulk wave phased array techniques, guided waves provide a mechanism for monitoring inaccessible areas and increasing the testing range to speed up the inspection process. Combining these two approaches, an efficient inspection scheme can be achieved. For this purpose, in this work, the possibility of exciting a single higher order guided wave mode at a low dispersion region is examined, using a conventional linear phased array on a 10 mm thick sample. An analytical model based on modal analysis is derived. Then, the time delays across each element of the array are optimally selected and a necessary condition on the pitch is provided, to enhance the purity of the desired mode. The results are promising, illustrating that single mode excitation is possible at high frequency-thickness products, greater or equal than 15 MHz⋅mm. Furthermore, the phased array transducer allows for dynamic mode selection capabilities; that is, feeding the appropriate excitation signals on each channel, different modes can be excited, without having to physically alter the transducer configuration.
KW - dynamic mode selection
KW - guided waves
KW - higher order mode excitation
KW - linear array transducer
KW - modal analysis
U2 - 10.1007/978-3-031-07322-9_9
DO - 10.1007/978-3-031-07322-9_9
M3 - Chapter
SN - 9783031073212
VL - 270
T3 - Lecture Notes in Civil Engineering
SP - 79
EP - 88
BT - European Workshop on Structural Health Monitoring, EWSHM 2022
A2 - Rizzo, Piervincenzo
A2 - Milazzo, Alberto
PB - Springer
CY - Cham, Switzerland
T2 - 10th European Workshop on Structural Health Monitoring
Y2 - 4 July 2022 through 7 July 2022
ER -