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Artifact suppression in ultrasonic guided wave damage imaging enhanced by topologically optimized mode selective meta-filter.

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Title: Artifact suppression in ultrasonic guided wave damage imaging enhanced by topologically optimized mode selective meta-filter.
Authors: Tian, Xiaochuan1 (AUTHOR), Song, Ailing1 (AUTHOR) ailingsong@ecust.edu.cn, Cao, Zhicong1 (AUTHOR), Peng, Siyuan1 (AUTHOR), Li, Youcheng1 (AUTHOR), Xiang, Yanxun1 (AUTHOR) yxxiang@ecust.edu.cn
Source: Ultrasonics. Oct2026, Vol. 166, pN.PAG-N.PAG. 1p.
Subjects: Lamb waves, Ultrasonic imaging, Ultrasonic propagation, Mathematical optimization, Structural health monitoring, Signal processing
Abstract: • Mode selective meta -filter (MSM) is designed based on inverse topology optimization framework. • MSM achieves 96.5% A0 mode attenuation and high S0 mode transmission efficiency. • MSM significantly improves imaging SNR and suppresses background artifacts. In ultrasonic guided-wave inspection of plate-like structures, Lamb wave multimode interference often results imaging artifacts and reduces damage localization accuracy. To purify the ultrasonic guided-wave mode at the physical level and suppress the artifacts, this paper introduces an inverse design framework based on topology optimization and, accordingly, develops a mode selective meta -filter. Within the target frequency band near 200 kHz, the designed meta -filter effectively suppresses the A0 mode while preserving high transmission efficiency of the S0 mode. Band-structure analysis and frequency- and time-domain finite element simulations reveal the underlying mechanism of its mode-selective wave manipulation. The experimental filtering results are in excellent agreement with the numerical predictions, demonstrating both the mode purification capability and practical feasibility of the meta -filter under realistic conditions. Furthermore, by integrating the meta -filter with an improved damage imaging method, both simulation and experimental results show a pronounced enhancement in imaging focusing and a substantial reduction in background artifacts. By realizing guided-wave mode purification through physical method and avoiding complex signal post-processing, this work provides a viable solution for structural health monitoring. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:• Mode selective meta -filter (MSM) is designed based on inverse topology optimization framework. • MSM achieves 96.5% A0 mode attenuation and high S0 mode transmission efficiency. • MSM significantly improves imaging SNR and suppresses background artifacts. In ultrasonic guided-wave inspection of plate-like structures, Lamb wave multimode interference often results imaging artifacts and reduces damage localization accuracy. To purify the ultrasonic guided-wave mode at the physical level and suppress the artifacts, this paper introduces an inverse design framework based on topology optimization and, accordingly, develops a mode selective meta -filter. Within the target frequency band near 200 kHz, the designed meta -filter effectively suppresses the A0 mode while preserving high transmission efficiency of the S0 mode. Band-structure analysis and frequency- and time-domain finite element simulations reveal the underlying mechanism of its mode-selective wave manipulation. The experimental filtering results are in excellent agreement with the numerical predictions, demonstrating both the mode purification capability and practical feasibility of the meta -filter under realistic conditions. Furthermore, by integrating the meta -filter with an improved damage imaging method, both simulation and experimental results show a pronounced enhancement in imaging focusing and a substantial reduction in background artifacts. By realizing guided-wave mode purification through physical method and avoiding complex signal post-processing, this work provides a viable solution for structural health monitoring. [ABSTRACT FROM AUTHOR]
ISSN:0041624X
DOI:10.1016/j.ultras.2026.108129