Investigation of Spectroradiometer Entrance Optics for Characterization of Expanded Radiant Areas

摘要

In many radiometric applications the spectral irradiance distribution of non-Lambertian sources, such as the solar spectrum, is determined by using compact array spectroradiometers with different types of entrance optics. The correction of a cosine error has to be considered for measurements of direct and diffuse radiation [1]. The estimation of uncertainties for the irradiance calibration of detectors such as solar cells with a source-based integral measurement method requires a thoroughly radiometric analysis of both the source and the detector [2], [3]. We will present the angular dependence of commonly used entrance optics. Furthermore, their influence on uncertainties in photovoltaic measurements will be discussed.