Assessing the consistency of optical properties measured in four integrating spheres

0473867 - ÚVGZ 2018 RIV GB eng J - Článek v odborném periodiku
Lukeš, Petr - Homolová, Lucie - Navrátil, M. - Hanuš, Jan
Assessing the consistency of optical properties measured in four integrating spheres.
International Journal of Remote Sensing. Roč. 38, č. 13 (2017), s. 3817-3830. ISSN 0143-1161. E-ISSN 1366-5901
Grant CEP: GA MŠMT(CZ) LO1415; GA MŠMT(CZ) LM2015061
Výzkumná infrastruktura: CzeCOS II - 90061
Institucionální podpora: RVO:67179843
Klíčová slova: Artificial material * Canopy radiative transfer * Directional hemispherical reflectances * Integrating spheres * Leaf optical property * Measurement protocol * Standard deviation * Statistically significant difference
Obor OECD: Environmental sciences (social aspects to be 5.7)
Impakt faktor: 1.782, rok: 2017

Leaf optical properties (LOPs) determine the radiation regime of vegetation, thus being key input parameters in leaf and canopy radiative transfer models. It is of great importance to know the uncertainties originating from the LOP measurements. The most common approach to measure LOP uses integrating spheres. They allow measurements of both directional-hemispherical reflectance factor (R) and transmittance factor (T). However, sphere's design, inner surface coating and measurement protocol differ among the spheres' models and manufacturers. Our main goal was to evaluate the consistency of optical properties measured in four integrating spheres (Dualsphere, Labspehre, ASD, and Li-cor). Our test samples were three Spectralon (R) panels, four artificial materials and leaves from six common broadleaf tree species. Results showed that spectra measured in the four integrating spheres were generally similar in the spectral region between 400 and 1600 nm. The average standard deviation computed among the spectra of all samples measured in all spheres was around 0.023 (and varied between 0.005 and 0.044). Statistically significant differences were detected mainly between Dualsphere and Li-cor spheres.
Trvalý link: http://hdl.handle.net/11104/0270979