For LPMA-IASI (Infrared Atmospheric Sounding Interferometer) + Mini DOAS

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Launch site:European Space Range, Kiruna, Sweden  
Launch team: CNES
Balloon: Open balloon (zero pressure)
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LPMA-IASI (Infrared Atmospheric Sounding Interferometer) + Mini DOAS

Responsable institution:  Laboratoire de Physique Moléculaire pour l'Atmosphère et l'Astrophysique (CNRS) / Institut für Umweltphysik (University of Heidelberg)
Principal Investigator:  Claude Camy-Peyret / Klaus Pfeilsticker

Is a modified version of the LPMA instrument (Limb Profile Monitor of the Atmosphere originally created to made Earth's limb measurements) used to observe the Earth's atmospheric emission at nadir, to determine the vertical profiles of various atmospheric gases such as H2O, CO2, CO, O3, N2O, & CH4 from high resolution atmospheric spectra. Their major goal is the preparation of the so called IASI mission, which is a satellite instrument dedicated primarily to operational meteorology, hence it is also known as IASI-balloon.

The instrument is composed by a BOMEM DA2 infrared Fourier transform spectrometer coupled with a movable mirror. An optical head with an aquisition mirror looks down and made the nadir observation while two references blackbodies one warm and the other cool are used for reference purposes. A CCD camera is used to image in the visible the atmosphere observed by the spectrometer and to make corrections in the instrument attitude commanding the aquisition mirror. The instrument is installed in the same gondola developed by the CNRS for the LPMA instrument, wich have an azimuth control system to compensate the balloon motion. An onboard PC computer controls the instruments during the flights, recording the interferograms and ensuring the telecommand and telemtry link with the ground station.

In this flight also was part of the scientific payload onboard the gondola the mini-DOAS (Differential Optical Absorption Spectroscopy) consisting of 2 light intake telescopes for simultaneous Nadir and scanning Limb observations (the latter being mounted on an automated elevation scanner). The incoming light is conducted into two Ocean Optics USB-2000 spectrometers which are mounted into an evacuated and thermo-stated housing and controlled by a single board computer for data handling and storage. The instrument was created to help in the validation of the SCHIAMACHY instrument onboard ENVISAT.