Senarmont compensator

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Ehringhaus compensator — Device used in interference or polarization microscopy to reduce the brightness of the object to zero in order to measure the phase retardation (optical path difference). The compensator consists of a birefringent crystal plate that can be tilted … Dictionary of molecular biology
interference microscopy — Although all image formation depends on interference, the term is generally restricted to systems in which contrast comes from the recombination of a reference beam with light that has been retarded by passing through the object. Because the… … Dictionary of molecular biology

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