Table 1 Pinhole size of two specimen

1

\(\Phi 5{\text{ mm}} \times {\text{3 mm}}\)

6

\(\Phi 0.5{\text{ mm}} \times {\text{3 mm}}\)

2

\(\Phi 4{\text{ mm}} \times {\text{3 mm}}\)

7

\(\Phi 0.5{\text{ mm}} \times {2}{\text{.5 mm}}\)

3

\(\Phi 3{\text{ mm}} \times {\text{3 mm}}\)

8

\(\Phi 0.5{\text{ mm}} \times {\text{2 mm}}\)

4

\(\Phi 2{\text{ mm}} \times {\text{3 mm}}\)

9

\(\Phi 0.5{\text{ mm}} \times {1}{\text{.5 mm}}\)

5

\(\Phi 1{\text{ mm}} \times {\text{3 mm}}\)

10

\(\Phi 0.5{\text{ mm}} \times {\text{1 mm}}\)

11

\(\Phi 0.5{\text{ mm}} \times {0}{\text{.5 mm}}\)