Laboratory X-ray techniques based on polycapillary optics have been first used for studying high dense sprays of the jet injection systems. Polycapillary optical elements are well known systems that enable shaping divergent X-ray beams (with energy of up to 30 keV) as well as to get high contrast image of the object studied due to the suppression of multiple scattered part of radiation. We have used a Cu Kα X-ray source in combination with polycapillary halflens (or semilens) and a Photonic Science CCD detector. Due to the low absorption features of gasoline for the used energy range, the images have been acquired in synchronized mode with the spray injection. As a result, it is shown that the absorption signal well emerges respect to the background indicating an interaction of the beam with the fuel.
S. et al. (Thu,) studied this question.