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Table 3 Calculated performance parameters of a telemicroscope in dependence on the extension tube length (focal length: \(f=50\) mm; f-number: \(N=2.8\); 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

l [mm] \(s_{2}\) [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 51.0 2550.0 0.02 352.00 264.00 152.24 2507.99 2593.44 85.45 220.00 440.0
2.0 52.0 1300.0 0.04 176.00 132.00 152.24 1288.99 1311.20 22.20 110.00 220.0
5.0 55.0 550.0 0.10 70.40 52.80 152.24 548.02 551.99 3.97 44.00 88.0
10.0 60.0 300.0 0.20 35.20 26.40 152.24 299.41 300.59 1.18 22.00 44.0
25.0 75.0 150.0 0.50 14.08 10.56 152.24 149.85 150.15 0.30 8.80 17.6
50.0 100.0 100.0 1.00 7.04 5.28 152.24 99.93 100.07 0.13 4.40 8.8
75.0 125.0 83.3 1.50 4.69 3.52 152.24 83.29 83.38 0.09 2.93 5.9
100.0 150.0 75.0 2.00 3.52 2.64 152.24 74.96 75.04 0.07 2.20 4.4
150.0 200.0 66.7 3.00 2.35 1.76 152.24 66.64 66.70 0.06 1.47 2.9
200.0 250.0 62.5 4.00 1.76 1.32 152.24 62.47 62.53 0.05 1.10 2.2