STUDY OF THE SIZE-OF-SOURCE EFFECT (SSE) ON THE CALIBRATION OF SPECTRAL RADIANCE STANDARDS

摘要

Standards and Calibration Laboratory of Hong Kong SAR, China has set up calibration service for spectral radiance light sources in the wavelength range from 300 nm to 1800 nm. The calibration is performed by direct comparison with reference spectral radiance light sources. A series of evaluation, including the study of the size of source effect, were conducted to validate the performance of the calibration system. In this paper, the evaluation of the size of source effect of the system is presented. The size of source effect was estimated as an uncertainty component of less than 0.1%. This is a relatively small contribution to the overall expanded measurement uncertainty of the system, which was estimated as 2.4% for the wavelength range between 400 nm to 1000 nm.