NIST maintains facilities and calibration standards for spectral radiance and irradiance at their Facility for Spectroradiometric Calibrations (FASCAL) and FASCAL 2. These facilities use advanced equipment like double monochromators and high-temperature blackbodies to calibrate transfer standards traceable to the SI. The spectral radiance sources are calibrated using a variable-temperature blackbody, while spectral irradiance standards are calibrated using a high-temperature blackbody at nearly 3000 K. The FICUS facility at SURF is used for calibrating deuterium lamps from 200 nm to 400 nm. These calibration standards are periodically compared against other national laboratories in international comparisons sponsored by the CCPR.
Source: https://www.nist.gov/programs-projects/spectroradiometry-sources
Keywords: blackbody, calibrate, facility
