Biomedical Engineering Reference
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Shear 2
Shear 1
Shear 2
Shear 1
A'
Specimen
B 3
3
B'
A 3
3
A"
B'
3
A'
B 3
3
3
DIC2 (90 º )
A 3
B'
B"
3
3
A' 3
A' 2
A 2
B' 2 B 2
,
,
LC2 (45 º )
Polarization
rotation
A'
A 2
B'
B 2
2
2
B 1
A 1
DIC1 (0 º )
A 1
A 1
B 1
B 1
A 0
LC1 (0 º )
Bias change
A 0
A 0
Y
Y
A 0
P (45 º )
X
X
A 0
A 0
Z
Y
0
X
Figure 2.6
Schematic of switchable beam-shearing DIC assembly with liquid crystal variable retarders.
The shear direction of the first prism DIC1 is chosen as the initial X -direction to describe
the orientation of the above-mentioned optical elements. The azimuth of the polarizer P is
45 in order to create equal intensities of polarization components that become spatially
divided by the first prism. The first liquid crystal cell LC1 introduces bias
Γ
between the
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