Single absorption grating experiment on Korean ancient coins

When using neutron scattering information in a conventional grating interferometer, there were significant limitations due to the configuration of the interferometer system in obtaining a graph of the autocorrelation length that confirms the internal structure of the object. To solve this problem, a simulation was conducted to obtain the autocorrelation length over a wide range by changing the system configuration using a single absorption grating (inverse pattern simulation). Using spatial harmonic imaging techniques for ancient Korean coins, we obtained images of various modalities and revealed the differences between genuine and counterfeit coins. This experiment was conducted at PSI's BOA.