Studies of Martian Atmosphere and Surface by the Planetary Fourier Spectrometer on board the Mars-94 mission

Abstract

The Planetary Fourier Spectrometer (PFS) on board the Mars-94 missionis an infrared spectrometer optimised for studies of the Martian atmosphere. Moreover the measurements of the instrument will provide also information about the surface composition and the surface- atmosphere interactions. The spectrometer consists of a Dual Rotational Reflector Interferometer (RRI) covering two spectral ranges 220 - 1670 cm-1 (6-45 m) and 2080 - 8000 cm-1 (1.25 - 4.5 m) the long wavelength channel (LWC) and the short wavelength channel (SWC) respectively. In the RRI two pairs of retroreflectors, which are connected by a L-shaped arms with an axle, are driven in parralel on a circular path. Patial misalignements due to tolerance effects of real optical and mechanical elements are taken into account in an estimation of the spectral responsivity in comparison with the ratiation of the Martian surface and atmosphere.