Abstract
This study determines the measurement errors for laboratory bidirectional reflectance (BRDF) measurements at the European Goniometric Facility (EGO, Ispra, Italy). The average total error depends strongly on the spectral signature of the sample, varying from 4% to up to 14%. The spatial illumination heterogenity is identified as the largest error source. Its effects increase with increasing zenith angles. It is shown that the instrument noise of the detector SE590 (Spectron Engineering) is a function of the maximum signal in a measured spectrum. Based on this result, a procedure to define the wavelength range with acceptable measurement errors is presented. Different ways to calculate the irradiance are compared. It is shown that calculating a constant irradiance for each incidence angle is in better agreement with the reciprocity principle than assuming a different irradiance for each illumination and viewing geometry.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
