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Table 4 Calculated performance parameters of a telemicroscope in dependence on the f-number (focal length: \(f=50\) mm; extension tube length: \(l=50\) mm; sensor size: 7.04 mm × 5.28 mm; pixel size: 4.4 μm × 4.4 μm; circle of confusion: \(c_{\mathrm{max}}=0.0059\) mm)

From: In situ erosion measurement tools for electric propulsion thrusters: triangular laser head and telemicroscope

N

\(s_{2}\) [mm]

\(s_{1}\) [mm]

M

\(w_{1}\) [mm]

\(h_{1}\) [mm]

\(s_{\mathrm{h}}\) [m]

\(s_{\mathrm{n}}\) [mm]

\(s_{\mathrm{f}}\) [mm]

\(s_{\mathrm{f}}-s_{\mathrm{n}}\) [mm]

\(w_{1}^{\mathrm{pix}}=h_{1}^{\mathrm{pix}}\) [μm]

lat. res. [μm]

1.0

100.0

100.0

1.00

7.04

5.28

426.19

99.98

100.02

0.05

4.40

8.8

1.4

100.0

100.0

1.00

7.04

5.28

304.43

99.97

100.03

0.07

4.40

8.8

2.0

100.0

100.0

1.00

7.04

5.28

213.12

99.95

100.05

0.09

4.40

8.8

2.8

100.0

100.0

1.00

7.04

5.28

152.24

99.93

100.07

0.13

4.40

8.8

4.0

100.0

100.0

1.00

7.04

5.28

106.58

99.91

100.09

0.19

4.40

8.8

5.6

100.0

100.0

1.00

7.04

5.28

76.15

99.87

100.13

0.26

4.40

8.8

8.0

100.0

100.0

1.00

7.04

5.28

53.32

99.81

100.19

0.38

4.40

8.8

11.0

100.0

100.0

1.00

7.04

5.28

38.79

99.74

100.26

0.52

4.40

8.8

16.0

100.0

100.0

1.00

7.04

5.28

26.68

99.63

100.38

0.75

4.40

8.8

22.0

100.0

100.0

1.00

7.04

5.28

19.42

99.49

100.52

1.03

4.40

8.8