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This project has been completed. The paper reporting the results is provided here. The NIST Thermodynamic Metrology Group (TMG) used its standard gravimetric
The NIST Hybrid Humidity Generator (HHG) is NIST’s primary standard humidity generator and is used for calibration of all hygrometers sent to NIST. The HHG and
The FASCAL has been in continuous operations since 1970s for the calibrations of spectral radiance of sources. The measurements are performed by the use of a
FASCAL 2 facility is solely dedicated to spectral irradiance scale realizations and calibrations. The spectral irradiance standards are calibrated using a high
This facility enables the measurement of spectral emittance using the direct method of radiance comparison of the sample with a blackbody reference source