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NDT.net Issue - 2019-03 - Articles
NDT.net Issue: 2019-03
Publication: 10th International Symposium on NDT in Aerospace, Oct 2018, Dresden, Germany (AeroNDT 2018)
Session: Structural Health Monitoring
ARTICLE

Non-uniform spatial sampling patterns for local wavenumber-based damage evaluation

Jakub Spytek2, Przemyslaw Rusin, Kajetan Dziedziech3, Lukasz Pieczonka8, Lukasz Ambrozinski8
AGH- University of Science and Technology67, Krakow, Poland

Abstract: A crucial factor for non-destructive inspections is time required to test the structural components. Local-wavenumber estimation of guided ultrasonic waves is a promising technique that permits to balance the required spatial resolution with the inspection time. In this method a single source generates guided waves propagating in a plate. Using laser interferometry the vibration responses are collected in a number of points. Next, the data are processed in the frequency-wavenumber domain to obtain spatial distribution map of the wavenumbers. Change of the wavenumber is typically due to a local change in thickness of the sample. Therefore, this method can be effectively applied for detection of corrosion patches, delamination, disbounds. Usually, the measurement points are spaced uniformly at a distance smaller than half of the wavelength to satisfy the Nyquist theorem for spatial sampling. However, as we show in the paper, different distributions of sensing points are also possible. We discuss the imaging performance of various spatial sampling schemes using phased arrays of limited aperture and extend this concept to laser-probing over the complete imaged surface.


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