Visibility is a crucial figure of merit for grating-based neutron phase contrast and dark-field imaging, and estimating it is important for imaging system design. In this paper, we study the visibility under polychromatic illumination by using partial coherence theory. Theoretically, we establish a model to predict the visibility for various cases. Experimental data are also measured by using polychromatic thermal neutron beam line to generate the visibility. Comparisons between the two show that our theoretical predictions and the experimental results agree with a probability higher than 70%.
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This work was performed while the author was with LMAM, School of Mathematical Sciences, Peking University. The author is now with Carestream Health Global R&D Center, 27 Xin Jinqiao Road, Jinqiao Software Park, Shanghai, 201206
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Lee, S.W., Zhou, Y., Zhou, T. et al. Visibility studies of grating-based neutron phase contrast and dark-field imaging by using partial coherence theory. Journal of the Korean Physical Society 63, 2093–2097 (2013). https://doi.org/10.3938/jkps.63.2093
- Grating-based neutron interferometer
- Partial coherence theory