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OUTLINE
Compensators are used for measuring the retardation in specimens with double refraction. Some
compensators* may also be used to enhance image contrast in polarized light observation. The following
table shows the retardation measuring range of the various compensators.
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Measuring Range of Compensators
Compensator Name
Thick Berek (U-CTB)
Berek (U-CBE)
Quartz Wedge (U-CWE2)
* Senarmont Compensator (U-CSE)
* Brace-Köhler Compensator 1/10
* Brace-Köhler Compensator 1/30
Measuring Range
λ
(U-CBR1)
λ
(U-CBR2)
λ
λ
0 -- 20
λ
0 -- 3
λ
1 -- 4
λ
0 -- 1
λ
0 -- 1/10
λ
0 -- 1/30
= 546.1 nm (e-line)