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Uncertainties of sensor-based method.
| Error | Runs for Averaging | Expanded Uncertaintya,b | Standard Uncertaintya |
|---|---|---|---|
| Straightness | 1 | 5.6 μm | 0.97 μm |
| Straightness | 5 | 4.1 μm | 0.70 μm |
| Straightness | 10 | 4.0 μm | 0.65 μm |
| Angular | 1 | 12.8 μrad | 2.3 μrad |
| Angular | 5 | 9.0 μrad | 1.4 μrad |
| Angular | 10 | 8.7 μrad | 1.3 μrad |
for 100 simulations with different randomly-generated errors over a 1-m travel
defines an interval estimated to have a level of confidence of 99 percent
