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

EPJ Techniques and Instrumentation

Table 1 Performance parameters of selected triangular laser heads (Source: https://www.keyence.co.uk/products/measure/laser-1d/lk-g3000/models/)

Reference distance [mm]	Measurement range\(^{(a)}\) [mm]	Minimum spot size\(^{(b)}\) [mm]	Linearity [mm]	Repeatability [μm]	Sampling frequency [μs]	Dimension [mm³]	Weight\(^{(c)}\) [g]
10	± 1	0.02	± 0.0003	0.02	20–1000	54 × 73 × 27	90
30	± 5	0.03	± 0.0025	0.05	20–1000	85 × 77 × 26	280
80	± 15	0.07	± 0.0075	0.2	20–1000	95 × 76 × 36	380
150	± 40	0.12	± 0.02	0.5	20–1000	83 × 77 × 34	290
400	± 100	0.29	± 0.05	2	20–1000	108 × 86 × 37	380
500	−250 to +500	0.30	± 0.1 to ± 0.5	2	20–1000	108 × 86 × 37	380

\(^{(a)}\) Given with respect to reference distance. \(^{(b)}\) Given at reference distance. \(^{(c)}\) Including cable.