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. An alternative to Senarmont compensation and has the advantage that it can be applied to retardations of more than one wavelength.

Dictionary of molecular biology. 2004.

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  • 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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