Table 1.
Uncertainty budget for Vis/NIR spectral comparator facility absolute spectral responsivity measurements from 406 nm to 920 nm
| Uncertainty origin | Relative standard uncertainty (%) | |
|---|---|---|
| Type A | Type B | |
| Relative experimental standard | ||
| deviation of the weighted mean | 0.05 | |
| Trap calibration with HACR | 0.03 | |
| Electrical current-to-voltage conversion | 0.003 | |
| Voltmeter calibration | 0.005 | |
| Wavelength calibration | 0.02 | |
| Stray light (spectral) | 0.01 | |
| Scattered light (spatial) | 0.05 | |
| Diffuse stray light | 0.001 | |
| Beam and detector nonuniformity | 0.05 | |
| Polarization sensitivity | 0.01 | |
| Responsivity non-linearity | 0.01 | |
| Temperature variations | 0.02 | |
| Long-term stability | 0.05 | |
|
|
||
| Relative combined standard uncertainty | 0.11 | |
| Relative expanded uncertainty (k = 2) | 0.22 | |