The Infrared Atmospheric Sounding Interferometer New Generation (IASI-NG) is a key payload element of the second generation of European meteorological polar-orbit satellites (METOP-SG) dedicated to operational meteorology, oceanography, atmospheric chemistry, and climate monitoring. IASI-NG is a follow-on system to the first generation of IASI on Metop to provide operational observations and measurements from polar orbit for numerical weather prediction, atmospheric chemistry and climate monitoring in the 2020 to 2040’s in the frame of the EPS-SG program. EPS-SG is a collaborative program between EUMETSAT, ESA, CNES. EUMETSAT is responsible for overall mission requirements, procurement of the launchers and LEOP services, development and operation of the ground segments.
ESA is responsible for the development and procurement of the MetOp-SG Satellites. The instrument is developed under the lead of CNES, who is responsible for the development and procurement of the IASI-NG System (Instrument, Ground Processing software, Technical Expertise Center). Airbus Defence and Space was selected for development of the “Space Segment” mainly consisting of the Instrument itself.
The measurement technique is based on wide field Fourier Transform Spectrometer (operating in the 3.5 - 15.5 µm spectral range) based on an innovative Mertz compensated interferometer to manage the so-called self-apodisation effect and the associated spectral resolution degradation. A Beam Splitter embedded into the Mertz interferometer separates the incoming beam to illuminate the two branches of the interferometer and to provide the outcoming beam towards the instrument Cryostat. The Tip/Tilt positioning of this Beam Splitter is a key parameter for the overall performance. Therefore a dedicated mechanism has to be implemented to actuate the Beam Splitter.This mechanism has to achieve nanometric resolution displacements over some tens of µm range, and to exhibit an excellent stability when not powered.
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