Journal
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
Volume 163, Issue -, Pages -Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2021.108151
Keywords
Automated non-destructive evaluation; Guided waves; Occupancy grid mapping; Shear horizontal waves; Ultrasonics
Categories
Funding
- EPSRC Delivering Enhanced Through-Life Nuclear Asset Management [EP/R004889/1]
- EPSRC UK Research Centre in Non-Destructive Evaluation (RCNDE) [EP/L022125/1]
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This study evaluated the benefits of using ultrasonic guided waves for mapping structures on a mobile magnetic robotic platform, successfully demonstrating the localization of edges and welded joints. The proposed mapping algorithm estimated the position of sample edges with a range accuracy of < 1.7 mm (1 sigma), showcasing the potential of this technology for future applications in embedded sensor technology.
This paper evaluates the benefits of using ultrasonic guided waves for the mapping of a structure, when implemented on a mobile magnetic robotic platform. It considers the specific problem of mapping geometric features using the guided ultrasonic waves, which enables the localisation of edges and/or the welded joints. Shear Horizontal (SH) guided waves generated by ElectroMagnetic Acoustic Transducers (EMATs) are used for mapping steel samples with a nominal thickness of 10 mm. A Bayesian mapping technique (Occupancy grid mapping) was used to map the boundaries of an irregular sample in a pseudo-pulse-echo mode. The principle is demonstrated in both simulation and laboratory-based experiments. It is shown that the proposed mapping algorithm successfully estimates the position of a sample's edges. Experimentally, a range accuracy of < 1.7 mm (1 sigma) was achieved on a 1 x 2 m sample using miniaturised EMATs operating at a wavelength of 22 mm.
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