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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