Impact-Echo Dataset \"Radarplatte\"

This dataset contains raw data resulting from Impact-Echo measurements at the reference conrete block \"Radarplatte\", located at BAM (German Federal Institute for Materials Research and Testing). This specimen has been described in detail by Niederleithinger et al. [1], who applied muon tomography, ultrasonic echo measurements, radar and X-ray laminography to visualize its internal structure. 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 publication elaborate on Impact-Echo theory, examples are [2-4]. 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 23x23 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] Niederleithinger, E., Gardner, S., Kind, T. et al. \"Muon Tomography of the Interior of a Reinforced Concrete Block: First Experimental Proof of Concept.\" Journal of Nondestructive Evaluation 40, 65 (2021). doi: https://doi.org/10.1007/s10921-021-00797-3 [2] 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) [3] 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 [4] 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