TROPOMI - the Instrument
TROPOMI technology
In order to improve with respect to the SCIAMACHY and OMI capabilities, the instrument has been designed with smaller ground pixels (optimizing the chance for cloud-free observations), improved signal-to-noise performance, and multiple overpasses per day to follow diurnal cycles.
TROPOMI is a non-scanning imaging absorption spectrometer. For an optimal thermical design there are independent UV/VIS/NIR and SWIR modules. An improved design and advanced detectors offer a larger viewing angle (115^o) and an ultra high resolution (10 x 10 km^2). TROPOMI has even smaller groundpixels than OMI but despite that fact a better signal-noise ratio. The SWIR-module uses unique immersed grating technology resulting in a reduction of the size of the instrument by a factor 40 compared to conventional grating technology. In addition the SWIR-possibilities of TROPOMI are a lot beter than those of SCIAMOACHY, both where the spacial resolution is concerned as well as the signal-noise ratio.
Specifications:
- non-scanning imaging absorption spectrometer
- spectral coverage UV/VIS/NIR/SWIR
- spectral resolution 0,45 nm (UV/VIS/NIR), 0,25 nm (SWIR)
- viewing angle 114° ('spoorbreedte' 2600 km at a height of 720 km)
- daily mondial coverage in a sun synchronus polar orbit (From a inclined orbit, as proposed for the TRAQ mission, a location ot an average lattitude will by observed 5 times a day)
- high resolution 10 km × 10 km
