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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