X-ray TV Imaging and Real-Time Experiments
Real-time X-ray topography is a powerful modern tool to study directly the dynamic behaviour of strain fields and defects in crystals under various influences. Real-time methods may be grouped into two broad categories depending on the general principle used to permit rapid viewing and recording of topographic images, namely the single-stage and the multiple-stage imaging methods. In the single-stage imaging method, an X-ray sensitive vidicon tube directly converts the X-ray topograph into an electronic charge pattern. This charge pattern is read out by a scanning electron beam and displayed as a visible image on a television (TV) monitor. Chikawa and collaborators [1,2] have developed this technique which is presently, however, limited to a spatial resolution of 30pm. On the other hand, we prefer the multiple-stage imaging method where the X-ray image is first converted into a visible pattern by a fluorescent screen . The visible light pattern is then optically coupled either by a lens or a fiber-optic plate to the input photocathode of a light-sensitive electro-optical device. The output image is displayed on a TV monitor. This method is inherently capable of higher resolution (presently ∼ 10 μm), which is a prerequisite for detection of individual dislocations. A survey and discussion about X-ray TV systems is given by Tanner  Green  and the present author .
KeywordsDomain Wall Misfit Dislocation Storage Unit Digital Integration Scanning Electron Beam
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