3D-visualisation of NDT data using a data fusion technique

Processing strategies for high-resolution GPR concrete inspections

“…As the maximum and average algorithms described by Kohl et al [4] did not produce satisfactory results, the datasets were decomposed into five frequency ranges with the help of a Coiflet wavelet and fused as described by Hugenschmidt and Kalogeropoulos [2]. To achieve this, each trace was decomposed into sub-spaces using finite time, oscillating, zero mean signals called wavelets [14].…”

“…Hugenschmidt and Mastrangelo [1] and Hugenschmidt and Kalogeropoulos [2] describe the acquisition and processing of pseudo 3-D data from retaining walls at a Swiss motorway by exploiting single polarized antennas. Kohl et al [4] describe the fusion of radar data with different polarizations and the combination with ultrasonic data. Langenberg et al [5] describe a unified theory of modeling and imaging with electromagnetic and elastic waves for the non-destructive testing of concrete.…”

The inspection of retaining walls using GPR

“…Based on the work by Kohl et al (2003), two data fusion algorithms were tested. The first computes the average of amplitudes:…”

Contribution of radar measurements to the inspection and condition assessment of railway bridges – case study at a historic masonry arch bridge in Oleśnica/Poland

“…After some standard data processing steps like cutting and sorting the profiles, the vertical and horizontal radar data were separately reconstructed with the 3D FT-SAFT algorithm (Mayer et al [5]). In the next step the vertical and horizontal profiles were combined using the maximum amplitude of the reconstructed data with a data fusion tool (Kohl et al [6]). View on the brickwork of the radar testing area 1 and testing area 2 (1.6 x 1.6 m) at the left wing wall.…”