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    Area of Science:

    • Optical Physics
    • Metrology
    • Radiometry

    Background:

    • The Ultraviolet Spectral Comparator Facility at NIST previously used transfer standards for detector calibration.
    • Transfer standards introduce uncertainties due to differences in calibration systems, light sources, and optics.

    Purpose of the Study:

    • To establish a direct calibration method for working standard detectors using an absolute-cryogenic radiometer.
    • To eliminate uncertainties associated with transfer standards in ultraviolet radiometry.

    Main Methods:

    • Replaced the argon mini-arc light source with a laser-driven source in a modified Ultraviolet Spectral Comparator Facility.
    • Developed a twin system, the Ultraviolet Scale Realization Facility (UV-SRF), for primary calibration.
    • Utilized an absolute-cryogenic radiometer for direct calibration of photodiodes.

    Main Results:

    • Successfully performed primary calibration of photodiodes using the UV-SRF.
    • Reduced relative standard uncertainties at wavelengths below 220 nm from over 1% (k=1) to below 0.5%.

    Conclusions:

    • Direct calibration against an absolute-cryogenic radiometer significantly reduces measurement uncertainties.
    • The UV-SRF provides a more accurate method for ultraviolet scale realization and detector calibration.