Abstract : X-ray fluorescence imaging using perfect planar square pore micro-channel plate X-ray optics (MPO) is investigated through the modeling of the MPO point spread function (PSF). A semi-continuous model based on the use of a simplified two parameters reflectivity curve is developed including in particular three kind of contributions. A validation of this model is carried out by calculating variations of several PSF characteristics with the MPO and fluorescence imaging parameters and comparing the results with ray-tracing simulations. A good agreement is found in a large range of X-ray energies; however it is shown that for the lower values of the working distance a discrete model should be used to take into account the periodic nature of the PSF. Ray-tracing simulated images of extended monochromatic sources are interpreted in the light of both the semi-continuous and discrete models. Finally solutions are proposed to improve the imaging properties of MPOs.
https://hal-univ-tln.archives-ouvertes.fr/hal-01891329
Contributor : Marc Gailhanou
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Submitted on : Tuesday, October 9, 2018 - 2:37:58 PM
Last modification on : Friday, October 26, 2018 - 3:02:03 PM
M. Gailhanou, P. Sarrazin, D. Blake. Modeling of x-ray fluorescence full field imaging using planar square pore micro-channel plate optics. Applied optics, Optical Society of America, 2018, 57 (23), ⟨10.1364/AO.57.006795⟩. ⟨hal-01891329⟩
