Improving depth resolution of ultrasonic phased array imaging to inspect aerospace composite structures

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dc.contributor.authorMohammadkhani, Reza
dc.contributor.authorFragonara, Luca Zanotti
dc.contributor.authorPadiyar M, Janardhan
dc.contributor.authorPetrunin, Ivan
dc.contributor.authorRaposo, João
dc.contributor.authorTsourdos, Antonios
dc.contributor.authorGray, Iain
dc.date.accessioned2020-01-31T09:45:21Z
dc.date.available2020-01-31T09:45:21Z
dc.date.issued2020-02-20
dc.description.abstractIn this paper, we present challenges and achievements in development and use of a compact ultrasonic Phased Array (PA) module with signal processing and imaging technology for autonomous non-destructive evaluation of composite aerospace structures. We analyse two different sets of ultrasonic scan data, acquired from 5 MHz and 10 MHz PA transducers. Although higher frequency transducers promise higher axial (depth) resolution in PA imaging, we face several signal processing challenges to detect defects in composite specimens at 10 MHz. One of the challenges is the presence of multiple echoes at the boundary of the composite layers called structural noise. Here, we propose a wavelet transform-based algorithm that is able to detect and characterize defects (depth, size, and shape in 3D plots). This algorithm uses a smart thresholding technique based on the extracted statistical mean and standard deviation of the structural noise. Finally, we use the proposed algorithm to detect and characterize defects in a standard calibration specimen and validate the results by comparing to the designed depth information.en_UK
dc.identifier.citationMohammadkhani R, Zanotti Fragonara L, Padiyar MJ, et al., (2020) Improving depth resolution of ultrasonic phased array imaging to inspect aerospace composite structures. Sensors, Volume 20, Issue 2, January 2020, Article number 559en_UK
dc.identifier.issn1424-8220
dc.identifier.urihttps://doi.org/10.3390/s20020559
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/15054
dc.language.isoenen_UK
dc.publisherMDPIen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectultrasonic NDEen_UK
dc.subjectautonomous inspectionen_UK
dc.subjectultrasonic phased arrayen_UK
dc.subjectcomposite materialsen_UK
dc.subjectdepth resolutionen_UK
dc.subjectdefect sizingen_UK
dc.subjectNDTen_UK
dc.titleImproving depth resolution of ultrasonic phased array imaging to inspect aerospace composite structuresen_UK
dc.typeArticleen_UK

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