Fig. 8
From: Small grains from Ryugu: handling and analysis pipeline for infrared synchrotron microspectroscopy
IR-CT and IR-SI principle of measurement. a description of 3D measurements setup pieces, b schematization of beam path for IR-CT measurements (transmitted beam) and IR-SI (reflected beam), c example of 1 hyperspectral image from IR-CT and IR-SI imaging techniques. The images shown in panel c correspond to the continuum signal at 2.7 µm transmitted (for IR-CT) or reflected (for IR-SI) by the sample. For IR-CT, 90 images are acquired, one every 2°, rotating the sample from 0° to 180°: the final dataset consists of 128 × 128×90 spectels (a spectel is the equivalent of a pixel for hyper-spectral imaging: only one value can be associated to a pixel, while a whole spectra can be associated to a spectel). For IR-SI, 18 images are acquired, one every 20°, rotating the sample from 0° to 360°: the final dataset consists of 32 × 32×18 spectels