Polarisation and Directionality of the Earth's Reflectances
|Within Vocab||SeaVoX Device Catalogue|
|Preferred Label||Polarisation and Directionality of the Earth's Reflectances|
|Definition||POLDER (Polarisation and Directionality of the Earth's Reflectances) is a passive optical imaging radiometer and polarimeter designed to observe solar radiation reflected by Earth's atmosphere, including studies of tropospheric aerosols, sea surface reflectance, bidirectional reflectance distribution function of land surfaces, and the Earth Radiation Budget. It measures surface reflectance in the visible and near-infrared bands. POLDER consists consists of a digital staring camera composed of a 274 x 242 pixel CCD (charged coupled device) detection array, wide field-of-view telecentric optics (plus-or-minus 51 degrees cross-track and plus-or-minus 43 degrees along-track) and of a rotating wheel carrying spectral and polarised filters of an optical subsystem and electronics subsystem. The optical subsystem consists of a telecentric lens, a filter wheel and a CCD array as a detector. The light is almost vertically incident on the filter wheel after the telecentric lens makes the optical correction. The CCD array (244 x 274 elements) can collect two-dimensionnal images. The filter wheel has 16 filters and is rotated so that 16-channel images are acquired per one rotation. The main functions of electronics subsystem are to process imagery (eg. A/D conversion), to handle telemetry/command for operation of the processed image and POLDER and to control the filter wheel, the electric power and the heat. POLDER measures radiation in nine spectral bands with wavelengths centred at 443.5 nanometres (nm), 490.9 nm, 563.8 nm, 669.9 nm, 762.9 nm, 762.7 nm, 863.7 nm, 907.1 nm and 1019.6 nm. It has a total of 15 channels and 3 polarisations at 3 wavelengths. Flown on ADEOS, ADEOS-2, PARASOL. http://www.wmo-sat.info/oscar/instruments/view/405|
|Has Current Version||http://vocab.nerc.ac.uk/collection/L22/current/TOOL1042/2/|
|Authored On||2016-11-15 14:35:44|
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