See Also: Ehringhaus compensator(medicine)
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Ehringhaus compensator (medicine) and in-group (oh)


Ehringhaus compensator (medicine)


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.


in-group (oh)



n [C]
a small group of people involved in an organization or activity who like the same things and are friendly with each Other, but do not want Other people to join them
-synonym clique clique