Abstract
A theoretical analysis of light depolarization in a system of parallel, birefringent plates imbedded in an isotropic or anisotropic medium is given. The possibilities and limitations of transmitted light intensity measurements applied for structural analysis of polycrystalline materials are discussed. The light-transmission method can be interpreted quantitatively only for small concentration of crystallites and rather thin samples, so that plate-plate interactions are excluded. Measurements of transmitted intensity make possible direct determination of the average orientation characteristic of plates' optical axes, 〈sin22α〉 and of the complex characteristicE 〈sin2δ/2〉, whereE=us/〈d〉, = fraction of the area of the sample occupied by the plates,u=volume fraction of plates (degree of crystallinity),s-thickness of the sample δ-relative optical retardation of a single plate. Degree of crystallinityu cannot be determined uniquely, except for some special conditions.
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