Solar spectral irradiometer for validation of remotely sensed hyperspectral data.
A new solar spectral irradiometer that operates in the visible and near-infrared spectral ranges has been developed. This instrument takes advantage of a new concept optical head that collects the light that impinges on a hemispheric surface, thus improving the instrument angular response with respect to traditional devices. The technical characteristics of the instrument are investigated and detailed, and its radiometric calibration, performed by means of a Langley-like method, is discussed. A new simplified theoretical model that accounts for the diffuse irradiance observed in an optically thin plane-parallel atmosphere has been developed to improve the fit of the irradiance diurnal evolution. An alternative polynomial parametric representation of monochromatic diffuse irradiance evolution has been attempted, but satisfactory results were not obtained from the fitting of experimental data. The new instrument could be useful to carry out remote-sensing validation campaigns.
Barducci
Alessandro
A
Institute of Applied Physics Nello Carrara, Consiglio Nazionale delle Ricerche, Via Panciatichi 64, Firenze 50127, Italy. i.pippi@ifac.cnr.it
Castagnoli
Francesco
F
Guzzi
Donatella
D
Marcoionni
Paolo
P
Pippi
Ivan
I
Poggesi
Marco
M