Impact-Echo Dataset "IE Platte"

This dataset contains raw data resulting from Impact-Echo measurements at the reference concrete block "IE Platte", located at BAM (German Federal Institute for Materials Research and Testing). The specimen contains three polystyrene slabs and one polyethylene foil to act as reflectors. The specimen was produced in a three-step process. First, the base plate was cast. Second, the reflectors were taped to the base plate. Finally, the upper layer was cast on top of base plate and reflectors. A drawing is contained in the dataset. The Impact-Echo method is based on the excitation of the zero-group-velocity frequency of the first symmetric Lamb mode of a plate-like structure, in order to assess its thickness. Numerous publications elaborate on Impact-Echo theory, examples are [1-3]. The measurements have been conducted using a setup that contains only commercially available components. The setup consists of an Olson CTG-2 concrete thickness gauge (Olsen Instruments, USA) for actuation and sensing and an 8-bit NI USB-5132 digital storage oscilloscope (National Instruments, USA) combined with the Echolyst software (Schweizerischer Verein für technische Inspektionen (SVTI), Switzerland) for data acquisition. Measurements were conducted using a grid of 29x29 points with a spacing of 50 mm. At each point 8192 samples were recorded at a sampling rate of 1 MS/s. The dataset contains the (X,Y) location in mm of the individual measurement points as well as the raw measurement data at those points. The data is provided in the formats *.mir/*.mhdr (Echolyst), *.npy (Python) and *.mat (Matlab) and *.csv to ease the import in various post-processing tools. References: [1] Gibson, A. and S. Popovics John (2005). "Lamb Wave Basis for Impact-Echo Method Analysis." Journal of Engineering Mechanics 131(4): 438-443. doi: https://doi.org/10.1061/(ASCE)0733-9399(2005)131:4(438) [2] Schubert, F. and B. Köhler (2008). "Ten Lectures on Impact-Echo." Journal of Nondestructive Evaluation 27(1): 5-21. doi: https://doi.org/10.1007/s10921-008-0036-2 [3] Abraham, O. and J. S. Popovics (2010). "Impact–echo techniques for evaluation of concrete structures." in Non-Destructive Evaluation of Reinforced Concrete Structures. Eds.: C. Maierhofer, H.-W. Reinhardt and G. Dobmann, Woodhead Publishing. 2: 466-489. doi: https://doi.org/10.1533/9781845699604.2.466