William F. Kaukler Physical processes which occur at, or near, interphase boundaries during solidification, or other phase transformations, play a major role in the determination of many of the technologically important properties of solids. Thus, little information is obtained about the detailed dynamics of the processes. This shortcoming impedes fundamental research and important technology developments, since the phenomena which occur at interphase boundaries during solidification determine many of the important properties of solids. This precludes the use of optical approaches for the focusing. Hence, only contact or projection radiography can be employed in this energy range.
Projection radiography uses the divergence of the beam from a very small source.
The ultimate resolution is limited by the diameter of the source. The figure below schematically indicates the components of the system and their placement. A high temperature furnace on a translation stage imposes a temperature gradient onto the sample. The resulting visible image is converted to a digital image by a CCD camera and stored in a computer. Schematic of the components of the x-ray projection camera.