SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY
|SeaVoX Device Catalogue
|The Scanning Imaging Absorption spectrometer for Atmospheric Chartography (SCIAMACHY) is an imaging spectrometer designed for the global measurement of trace gases, aerosols and clouds in the troposphere and stratosphere via observation of transmitted, back scattered and reflected radiation from the atmosphere. The instrument consists of a nadir and limb scanning component. Measurements are performed by observing the atmosphere under different viewing angles. In Nadir Mode, global distribution (total column values) of the atmospheric trace gases, clouds and aerosols are observed. In this mode, the instrument is scanning across-track. To obtain the altitude distribution of trace gases, SCIAMACHY performs observations in limb over an altitude range of 100 km, with a vertical resolution of 3 km. Light from the atmosphere is fed by the scanner unit consisting of an azimuth and an elevation scanner into the telescope which directs it onto the entrance slit of the spectrometer. The spectrometer contains a pre-disperser which separates the light into three spectral bands followed by a series of dichroic mirrors which further divide the light into a total of eight channels. A grating is located in each channel to diffract the light into a high resolution spectrum which is then focused onto eight detectors. The pre-disperser also serves as a Brewster window to separate polarised light, a part of which is sensed by the Polarisation Measurement Device (PMD). The output of the PMD is later used to correct for the polarisation effects. SCIAMACHY has a resolution ranging from 0.2 to 0.5 nm, and operates in wavelengths over the range 240 to 1700 nm, and 2000 to 2400 nm. Flown on Envisat. https://earth.esa.int/web/guest/missions/esa-operational-eo-missions/envisat/instruments/sciamachy
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|Atmospheric chemistry remote sensors
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