Abstract
We demonstrate the nondestructive evaluation by means of directional ultrasound emitted from a planar metasurface. The ultrasound metasurface is designed to generate the collimated and directional ultrasound efficiently in a planar configuration, which is endowed with the full-2π-range phase manipulation ability and high transmittance up to 80%. We employ the directional emission based on the ultrasound metasurface to innovate the traditional nondestructive evaluation methods, benefited from the freely controlled directivity and the superior fitness to sample surface of the planar metasurface. Merits of this innovative application are evidenced by the remarkable accuracy (higher than 98%) in the thickness evaluation, and precise detection (accuracy higher than 96%) of the special defect inside the V-shaped workpiece which is intractable to be inspected conventionally. The implementation of the metasurface-based directional ultrasound emission in the nondestructive evaluation bears the advantages of high coupling efficiency, superior fitness, high accuracy, and applicability to special defect, providing new solutions to the challenges in conventional defect detection and promotes the development in the nondestructive evaluation applications.
Highlights
Measurements based on acoustic waves have been widely explored in many applications such as nondestructive evaluation and biomedical engineering
The actual position of strip defects is da2 120 mm, and the relative error of the detection is ε2 (d2 − da2)/da2 3.3%, which remains smaller than 4%. These results reveal that the directional ultrasound emission based on the metasurface can be expediently employed to the special defect detection with high precision
We have theoretically proposed and numerically demonstrated the nondestructive evaluation including the thickness evaluation and special defect detection by means of directional ultrasound waves emitted from a planar metasurface
Summary
Measurements based on acoustic waves have been widely explored in many applications such as nondestructive evaluation and biomedical engineering. The ultrasound measurements (Chatillon et al, 2000; Donskoy et al, 2001; Babich et al, 2004; Dutton et al, 2011a; Edwards et al, 2011; Edwards et al, 2012; Yassin et al, 2018; Taheri and Hassen, 2019) have been proved to be a powerful means for measuring and characterizing the workpieces. For the detection of targets in different scenarios, the collimated and directional ultrasound emission (Ren et al, 2010; Layman et al, 2011; Ren, 2015; Tang and Ren, 2017a; Tong et al, 2020) with varied incident angles is desired, which is conventionally realized by the combination of a planar transducer and the wedges of different angles (Bermes et al, 2008; Pruell et al, 2009). For some special sample measurements such as the V-shaped workpiece, it might meet difficulties in placing the equipment for inspecting of the buried defect and affect the defection accuracy
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