Apoyo a la Investigación I+D+i

Fotómetro solar CIMEL CE-138

The CIMEL CE-138 sun-photometer measures solar transmissions, aureole and sky radiances through a large range of scattering angles. The automatic tracking Sun and sky scanning radiometers made direct Sun measurements with a 1.2º full field of view every 15 min at 340, 380, 440, 500, 675, 870, 940, and 1020 nm (nominal wavelengths). The direct Sun measurements take about 8 s to scan all seven wavelengths, with a motor-driven filter wheel positioning each filter in front of the detector. These solar extinction measurements are then used to compute aerosol optical depth at each wavelength except for the 940 nm channel, which is used to retrieve total column water vapour in cm. The filters utilized in these instruments were ion-assisted deposition interference filters with a band pass (FWHM-full width at half maximum) of 2 nm for the 340 nm channel and 4 nm for the 380 nm filter; the band pass of all other channels was 10 nm. This sun-photometer is part of AERONET network, instrument #18.