Static Fourier transform spectroscopy breadboards for atmospheric chemistry and climate

New types of sounders dedicated to selected species could be used on small satellites to monitor atmospheric chemistry with simpler instruments. A new kind of Fourier transform spectrometer has been patented by CNES a few years ago. Based on a static configuration, two projects are being studied at CNES with laboratory breadboards. One is dedicated to CO2 concentration monitoring in near infrared. The other one works in thermal infrared to study CO and O3 atmospheric profiles. MoLI breadboard, with a new highly integrated interferometric core, will be used for a long time measurement of CO2 concentration. MOPI is another breadboard under development to transpose this concept in thermal infrared during the SIFTI phase A study. These new generation spectrometers consist in a Michelson interferometer with staircase mirrors assembled by molecular adhesion. They are adapted to narrow spectra sounding from space and could lead to totally static and highly stabilized instruments.