Nevertheless it is sometimes interesting to have section images of transverse resolution in order to overcome the overlap of details by projection effects. Refraction computer tomography Conventional CT evaluates the density distribution by X-ray absorption. In contrast to this, Figure 4 demonstrates the feasibility of X-ray refraction computer tomography. Micrograph of carbon reinforced plastic laminate, density image by classical computer tomography and interface image by X-ray refraction computer tomography. Linear scans are performed at 360 angles, the signals are Fourier filtered on a personal computer and added up to an image file.
Separate detectors register the deflected and the straight beam signals.
Two CT images result. The typical layer and crack structure of the micrograph can be recognised. X-ray refraction therefore could help faster materials development, better understanding of micro structures and partly replace micro analysis and mechanical testing of advanced materials. However a stand alone instrument for commercialisation is under development. Feedback Preparing for the Future Vol.