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Control and data acquisition of automated multi-sensor systems in civil engineering

A combination of different non-destructive test methods is often necessary to receive reliable results for material characterization, flaw detection and the determination of component specific geometry parameters. Concerning concrete structures, thickness measurements combined with flaw detection and additional information about reinforcement and tendon ducts are needed. Therefore, a multi-sensor measurement approach is required with a high degree of automation. Otherwise a time consuming succession of manual measurements has to be performed which would prevent practical applications. Furthermore, the required information about material, flaws and component geometry is only gained when the multi-sensor data is combined for data analysis. Then high resolution results can be achieved. A modular control and data acquisition approach will be described and the application to two different automated measurement devices will be shown. The presented developments are results from two collaborative projects dealing with the development of an automobile robot system and a highly flexible scanner system. These different applications are based on a similar kernel allowing the modular use of different contact and non-contact sensors. This measurement approach leads to results in form of point data and time series. Furthermore, the coordinates of each measurement can be device dependent. Therefore, a flexible analysis concept is provided. The non-continuous grid spacing requires the use of interpolation and triangulation approaches. Since often only a combination of several methods will lead to significant results, the fusion of the analysed data must also be possible.