Interference_Figures - Interference Figures Very important...

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Interference Figures Very important tool to determine optical characteristics - uniaxial v. biaxial - optic sign - 2V angle • Technique: - Focus with highest power objective - Be certain observation is conoscopic light - Insert Betrand lens or remove ocular • Figure consist of isogyres and isochroms - isochromes: patterns of interference colors - isogyres: dark bands (extinction) • Nature of interference figure and patterns as stage rotated determines optical property • Types of figures controlled by cut of the grain Uniaxial Interference Figure • Three types: - Optic axis figure - Off-center optic axis figure - Flash figure Optic axis figure • Forms when optic axis perpendicular to stage - low interference color (extinct) 1
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• Figure: - black cross of isogyres - circular isochroms - middle of isogyres called melatope - location of optic axis - isogyres increase in order of color outward • Origin of isochromes: - light traveling along optic axis (melatope) have no retardation - light near melatope have low retardation, (d and δ increase) - light far from melatope have higher retardation (d and δ increase more) • Thicker and high birefringent minerals have more isochromes - e.g. calcite v. quartz • Origin of Isogyres: - occur where vibration directions parallel polarizer directions - Areas of extinction
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This note was uploaded on 07/06/2011 for the course GLY 5245 taught by Professor Staff during the Spring '11 term at University of Florida.

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Interference_Figures - Interference Figures Very important...

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