The Optical Sensor Group (844.05) establishes the
national measurement scale for the SI unit, the
candela; provides measurements of absolute spectral
responsivity of optical detectors in the spectral
region from 200 nm through the IR using a high
accuracy absolute cryogenic radiometer; performs
research and development of methods and optical
detectors for applications in radiometry,
photometry, colorimetry and spectroradiometry;
provides calibration services for detector spectral
responsivity, photometry, and colorimetry of light
sources.
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