Color Insert - Microsurgery: Advances, Simulations, and Applications - page 309

40 mmHg 100 mmHg 160 mmHg

50 mmHg 110 mmHg 170 mmHg

60 mmHg 120 mmHg 180 mmHg

70 mmHg 130 mmHg 189 mmHg

2560 2560

1920 1920

80 mmHg 140 mmHg

1280 1280

640 640

200

0

σ 1 -σ 2
(mmHg)

D (µm)

90 mmHg 150 mmHg

Figure 4.14 Result image of the 16 samples. Below each set of two images,

the corresponding pressure is written. For each set, optical
path length

(left) and the corresponding photoelastic stress
analysis (right) are shown. A local maximum of stress appears
on the right side of the phantom as pressure increases.

D

Polarizer

1/4λ Plate

Arterial Model

ϕ Extra wave plate

1/4λ Plate

Polarizer

a) b)

Figure 4.17 Circular polariscope for simultaneous measurement of

stress magnitude and direction (left). High contrast between
background and surgical instruments (right).