Optical calibration facility at the Izaña Atmospheric Research Center

During the last years a new optical calibration facility has been developed and deployed at the IzanaObservatory for the calibration and characterization of the radiation measuring instruments withinresearch activities. These activities require a traceable Quality Assurance & Quality Control system.This new facility allows the absolute, spectral and cosine response calibration. At present there aresix set-ups running at the laboratory for radiance calibration, angular response determination,spectral response characterization, slit function determination and absolute irradiance calibration(vertical and horizontal set-ups). Each method and procedure has required the development of thecorresponding protocol. These systems, as well as some examples of instrument calibrations, arepresented in this work.