| Overview
The POLDER (Polarization and Directionality of the Earth's Reflectances) instrument will observe the polarization, directional and spectral characteristics of the solar light reflected by aerosols, clouds, oceans and land surfaces.
POLDER is a push broom, wide field of view, multi-band imaging radiometer/polarimeter developed by CNES. Multi-angle viewing is achieved by the along-track migration at the spacecraft velocity of a quasi-square footprint intercepted by the total instantaneous 114-degree wide field of view. This footprint is partitioned into 242x274 elements of quasi-constant 7kmx6km resolution, imaged by a CCD matrix in the focal plane (fig).
Simultaneously, a filter/polariser wheel rotates and scans eight narrow spectral bands in the visible and near infrared (443,490,565,665,763,765,865 and 910 nm), and three polarization angles at 443,665 and 865 nm (fig).
Characteristics
| Spectral range |
0.443 - 0.91mm |
| Expected absolute accuracy |
2%l less or equal 565nm |
| Pixel cording |
3%l less or equal 665nm |
| Data rate |
12bit 882kbps |
| Mass |
33kg |
| Power consumption |
42W |
| Size(mm) |
800×500×250 |
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