Micro-Wave Radiation Imager
|Within Vocab||SeaVoX Device Catalogue|
|Definition||The Microwave Radiation Imager (MWRI) is a conical-scanning microwave imaging radiometer designed to measure precipitation, soil moisture, vegetation, cloud liquid water and sea surface parameters such as wind. The MWRI gathers light through a ground-pointing telescope, whose scan mirror oscillates (1 cycle every 33 milliseconds) over an angular displacement of plus-or-minus 2.89 degrees that is perpendicular to the orbital track. Light reflected from the surface and atmosphere as gathered by this scan passes through an optical lens train, during which the beam is divided to pass through 4 bandpass filters that produce images in 4 spectral bands. The light from each filter then reaches a set of six electronic detectors (24 in total, 6 per spectral band) that subdivides the across-track scan into 6 parallel lines, each equivalent to a ground width of 79 m. The MWRI features 10 channels with five frequencies in the range 10.65-89 GHz. The nadir spatial resolution range varies from 15-85 km depending on frequency. The wavelengths of the four spectral bands are 0.5-0.6 micrometres, 0.6-0.7 micrometres, 0.7-0.8 micrometres and 0.8-1.1 micrometres. The instrument has a swath width of 1400 km and a scan rate of 35.3 scan/min, or 11.2 km/scan. http://www.wmo-sat.info/oscar/instruments/view/350|
|Is Version Of||TOOL1037|
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