Feye Treimer U.

Hilger A.

Kardjilov N.

Manke I.

Strobl M.

Treimer W.

Thermal and cold neutrons are a perfect tool to investigate massive and large  several cm3  samples   by means of computerized tomography  CT . The main interaction to visualize structures in samples is absorption, similar to x rays in medicine or material research. Based on absorption new techniques such as energy dependent CT or real time CT have gained importance within the last years and were used to show e.g. the movement of pistons in engines. Absorption, however, is not the only interaction that can be used for computerized tomography. Other interactions such as interference effects,   so called phase based interactions, were exploited for CT to visualize details in samples that could   not be detected by absorption. Phase contrast imaging was first applied to x ray CT, but soon it was   also applied to neutron CT. Based on the same interaction, refraction and ultra small angle scattering   of neutrons were studied and successfully applied to neutron tomographic investigations of samples. These new imaging signals  refraction and ultra small angle scattering  require entirely different techniques, different experimental set ups  high resolution double crystal diffractometer  and special data evaluation, to detect these signals and separate them from absorption and noise. Using absorption and phase based signals the length scale of tomography with neutrons is more than five orders of magnitude, which covers a large field of non destructive testing in material research and fundamental physic

Absorption and phase based imaging signals for neutron tomography

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