Optical Spectrograph and infrared Imager System
|Within Vocab||SeaVoX Device Catalogue|
|Definition||The Optical Spectrograph and infrared Imager System (OSIRIS) is a limb-scanning spectrometer. It measures vertical profiles of spectrally dispersed, limb-scattered sunlight from the upper troposphere into the lower mesosphere to produce height profiles of O3 (ozone), NO2 (nitrogen dioxide) and stratospheric aerosols. It operates in the visible, near-infrared and near-ultraviolet spectrums. The OSIRIS instrument is essentially two optical subsystems, suggested by its name: an optical spectrograph (OS) module and an infrared imager (IRI) module. The OS is a grating spectrometer with a CCD (charged coupled device) detector. Vertical profiles of the limb radiance are obtained by taking OS exposures while performing a repetitive vertical scan of the single line-of-sight through selected tangent altitude ranges (10 - 100 km). The IRI is composed of three vertical near infrared co-aligned linear array imagers that capture one-dimensional images of the limb radiance with a tangent altitude resolution of approximately 1 km. The imagers have parallel bore-sights; each one consists of an identical baffling system, lens, narrow-band interference filter, and a one-dimensional linear array of 128 thermo-electrically cooled photodetectors placed in the focal plane of the lens. Approximately 30 photodetector elements at one end of each array are covered with a mask in order to provide a continuous measure of the dark signal in the array. Therefore there are approximately 100 lines of sight from each imager channel that measure simultaneously over 100 vertical kilometres in tangent altitude. OSIRIS (OS) has a spectral range of 280 - 800 nm and a spectral resolution of 1 nm when at an altitude range of 5 -100 km. Each scan takes 40 - 70 seconds. The OS also has a minimum sensitivty of 12 kR per Angstrom per pixel. The IRI captures images of the limb radiance at at 1260, 1270, and 1530 nm and has a sensitivity of 50 kR per band per pixel. Flown on Odin. http://www.wmo-sat.info/oscar/instruments/view/383|
|Has Current Version||2|
||Atmospheric chemistry remote sensors||Mapping: 885526|
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