Spectral responsivity calibrations
These calibrations are based on the scale of spectral radiant power responsivity, which is maintained by NIST’s Primary Optical Watt Radiometer (POWR). Solid-state transfer standard detectors are used to transfer the optical power unit--the optical watt--from this cryogenic radiometer to the working standard detectors used in the SCFs. The visible to near-infrared (Vis/NIR) SCF typically measures the spectral responsivity of photodiodes in the 350 nm to 1800 nm spectral region. The ultraviolet (UV) SCF typically measures the spectral responsivity of photodiodes in the 200 nm to 500 nm spectral region.
For technical information, see NIST Special Publication 250-41a (pdf).
CCPR Key Comparisons
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