Abstract
Two diffractometers (linear spectrometers) are described, for spatial filtering of the moire fringes formed between a reference grid and a photographic copy of a strained specimen grid. Simple adjustments of the diffractometers enable initial apparent strains to be superimposed on the strained grid, and the location of the fringe pattern to be changed by known displacements of the reference grid. Both of these adjustments considerably increase the precision of the analysis.
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