Individual mineral grains can be selected for identification and determination of crystal orientation, or data may be acquired on a grid over a selected area of the surface of the sample to determine the identity, orientations, and spatial relations between a large number of grains. These data are used to identify the phase, to index the pattern, and to determine the orientation of the crystal from which the pattern was generated. The pattern of Kikuchi lines on the phosphor screen is electronically digitized and processed to recognize the individual Kikuchi lines. The optimal arrangement results when the camera is as close to the sample as possible while avoiding the possibility of collision between the sample surface and the delicate phosphor screen. It is inserted to within several mm of the surface of the inclined sample. The camera resides on a horizontally mounted motorized carriage. ![]() The detector is actually a camera equipped with a phosphor screen integrated with a digital frame grabber. The polished sample is placed in the SEM and inclined approximately 70 o relative to normal incidence of the electron beam.
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