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Time slices of very dense GPR measurements carried out at concrete with a real point distance of less than 10 mm in x and y direction show weak reflection patterns besides the strong reflections of reinforcements. A repetition of these measurements with the same local geometrical precision at the same specimen shows the same reflection pattern. We suppose that the heterogeneity of concrete given by...
The presented method for casting production of coils for electrical machines offers significant advantages over conventional production methods in terms of achievable performance, torque density, and the production costs of electrical machines. Below, the outline of the procedure is presented in accordance with electrical and constructive conditions. Based on initial casting experiments, the principle...
A study of density and glue distributions in polymer foam models for lost foam casting processes is reported. THz-pulse measurements were compared with destructive measurements according to the principle of buoyancy-floating method to guarantee high quality standards in lost foam casting processes.
Moisture ingress is one of major damaging factors for masonry buildings. As the complex resistivity (CR) is sensitive to textural properties as well as to the pore fluid chemistry of wet porous media, its nondestructive application can provide helpful information for conservators. In a comprehensive laboratory study it has been shown that CR might even be able to distinguish between salt content and...
A pulsed microwave method using a frequency range of about 7 GHz has been developed based on the principle of the pulsed radar method. This method is employed for the non-destructive quantitative determination of the moisture content and distribution in brickwork. The measurements are more precise than previous measurements that have used frequencies below 1 GHz. Owing to the shorter wavelength...
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