Figure 3
Illustration of the experiment. (a) Setup of the TOMCAT beamline with parallel beam illumination of the match positioned at the center of a fast rotating stage. The match was ignited by a laser system and observed by a CCTV camera. The detection system was positioned 228 mm behind the object. (b) A raw image recorded with an acquisition time of 1 ms, and (c) the same image after preprocessing and phase-retrieval (see text). (d) A sinogram extracted from all 18800 reconstructed projections at the position of the red dashed line. A shrinking of the structure and a loss of material is observed, accompanied by a decrease in photon absorption. The bottom row depicts tomographic reconstructions of the highlighted sinogram segments, each consisting of 401 equidistant projections. The shape, features of the wooden structure and the stages of the burning process can be clearly identified. Nevertheless, the reconstructions show motion artefacts such as ‘streaks’ and non-closed shapes in detail. Scalebars 1 mm.
