The plot shows the current total uncertainty for GLAMR as established for the OCI measurement campaign. The total uncertainty includes terms for NIST traceability, repeatability, noise, sphere uniformity, fluorescence of the sphere and linearity of the radiometers.
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The foundation of the GLAMR uncertainty is the uncertainty in the NIST calibration of the GLAMR transfer radiometers, which are used to transfer the NIST absolute radiometric scale from the SIRCUS system to the GLAMR sphere monitor radiometers. This plot shows the current state of the NIST uncertainty for the calibration of the transfer radiometers.
The full NIST report for the latest calibrations (2021/2022) can be accessed here:
The NIST reports for the earlier calibrations can be accessed here:
- 2017 Silicon LTD-11-104 radiometer