X-ray phase tomography by Talbot interferometry functions with X-rays of a broad energy band, and a pink- beam extracted by a multilayer mirror from white synchrotron radiation is used for four-dimensional X-ray phase tomography, which was developed at BL28B2, SPring-8, Japan. Polymer samples under infrared laser irradiation were observed as model experiments of laser processing. In this paper, laser ablation for a carbon-fiber reinforced polymer (CFRP) sample is reported. Thanks to the fact that the fibrous structure generates visibility (or dark-field) contrast, four-dimensional tomogram from the visibility reduction is presented. A technical effort to improve the temporal resolution from 1 s to 160 ms is also described.
This paper review the configurations of grating-based X-ray interferometry for X-ray phase imaging/tomography and describes recent activities for four-dimensional X-ray phase tomography and nanoscopic X-ray phase tomog-
raphy. A multilayer mirror to produce a 10% bandwidth pink beam at 25 keV has been installed at SPring-8 for four-dimensional X-ray phase tomography, and an application to polymer laser ablation is presented. A 100-fold full-field X-ray microscope employing a Fresnel zone plate has been used successfully in combination with a Talbot interferometer to perform nanoscopic phase tomography for a malleal processus brevis of a mouse nine days after birth. Another development using a laboratory-based full-field X-ray microscope in combination with a Lau interferometer is also described.
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