DOI: 10.7910/dvn/unoh2u
title: Impact-Echo Dataset "Radarplatte"

description: 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. 
&lt;br&gt;
&lt;br&gt;
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].
&lt;br&gt;
&lt;br&gt;
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.
&lt;br&gt;
&lt;br&gt;
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.
&lt;br&gt;
&lt;br&gt;
The dataset contains the (X,Y) location in mm of the individual measurement points as well as the raw measurement data at those points.
&lt;br&gt;
&lt;br&gt;
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.
&lt;br&gt;
&lt;br&gt;
&lt;br&gt;
References:
&lt;br&gt;
[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: &lt;a href="https://doi.org/10.1007/s10921-021-00797-3" ­target="_blank"­&gt;https://doi.org/10.1007/s10921-021-00797-3&lt;/a&gt;
&lt;br&gt;
[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: &lt;a href="https://doi.org/10.1061/(ASCE)0733-9399(2005)131:4(438)" ­target="_blank"­&gt;https://doi.org/10.1061/(ASCE)0733-9399(2005)131:4(438)&lt;/a&gt;
&lt;br&gt;
[3] Schubert, F. and B. Köhler (2008). "Ten Lectures on Impact-Echo." Journal of Nondestructive Evaluation 27(1): 5-21. doi: &lt;a href="https://doi.org/10.1007/s10921-008-0036-2" ­target="_blank"­&gt;https://doi.org/10.1007/s10921-008-0036-2&lt;/a&gt;
&lt;br&gt;
[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: &lt;a href="https://doi.org/10.1533/9781845699604.2.466" ­target="_blank"­&gt;https://doi.org/10.1533/9781845699604.2.466&lt;/a&gt;
description: Echolyst, 2021
description: Python, 3.8
description: numpy, 1.19.2
description: scipy, 1.5.2
description: The original Echolyst data in *.mir/*.mhdr formats has been converted to *.csv, *.npy and *.mat using the Python csv, numpy and scipy libraries, respectively.
<br>
<br>
In the original data, the first measurement point is located at (x,y) = (0,0) mm. In the conversion, this is corrected to fit the specimen coordinate system, i.e. all points are shifted by (x,y) = (50,50) mm, since the true first point was located 50 mm from the specimen edges, not directly on the specimen corner.