J-P. Bibring N. Thomas F. Westall M. Berthé V. Leroi on behalf of the entire MicrOmega team Phyllo workshop, Paris, October22, 2008 MicrOmega / ExoMars

MicrOmega is a set of two microscopes (VIS and IR) designed to analyze the samples prior to and after having been processed, to ● characterize in a purely non destructive manner their structure, morphology and composition (mineralogical, molecular) at a microscopic scale, and ● enable the selection of phases of interest for their further analyses. Phyllo workshop, Paris, October22, 2008

MicrOmega / ExoMars Amongst the goals: ● to identify, at a grain scale, small carbonates within phyllosilicates, fully characterized, to derive the pCO 2 as a record of the environment at the time water was liquid at the Mars surface; ● to identify potential C-rich phases coupled to these phases, to be further analyzed by other investigations. Phyllo workshop, Paris, October22, 2008

MicrOmega / ExoMars MicrOmega / VIS will observe the preprocessed (drilled) core samples, with the molecular complement provided by Raman; MicrOmega / IR will image and characterize the processed (crushed) samples, in conjunction with XRD and MOMA. Phyllo workshop, Paris, October22, 2008

MicrOmega / V Raman MicrOmega / V Raman drilled core sample

Current Baseline Front view Top view MicrOmega / V Raman MicrOmega / V Raman

MicrOmega / VIS

1. 2k x 2k CCD, 4 µm spatial sampling color LEDs 3. White LEDs + polarizers

Front view Top view MicrOmega / IR

sample white source AOTF IR monochromatic MicrOmega / IR

sample LED visible sources white source AOTF IR monochromatic MicrOmega / IR

sample Detector assembly with TEC Imaging optics Imaging optics LED visible sources white source AOTF IR monochromatic MicrOmega / IR

sample Detector assembly with TEC Imaging optics Imaging optics LED visible sources white source AOTF IR monochromatic MicrOmega / IR

sample white source AOTF IR monochromatic MicrOmega / IR

sample white source AOTF IR monochromatic For a given RF frequency, the sample is illuminated with a monochromatic light. By scanning the frequency, one builds a 3 D (x,y,λ) hyperspectral image cube MicrOmega IR, AOTF

For a given RF frequency, the sample is illuminated with a monochromatic light. By scanning the frequency, one builds a 3 D (x,y,λ) hyperspectral image cube

RF ON : only one optical wavelength is transmitted All other optical wavelength are trapped in the crystal AOTF Output spectra at various RF settings MicrOmega IR, AOTF

sample Detector assembly with TEC Imaging optics Imaging optics LED visible sources white source AOTF IR monochromatic The focal play is an integrated hermetic package including a 256x256 IR (HgCdTe) matrix mounted onto a dedicated TEC to provide its operational temperature (~190 K)

MicrOmega Breadboard IR detector Focal plane: 256 x 320 pixels: 30 µm x 30 µm Responsivity: 0.8 µm à 2.6 µm Pixel capacity > e - 4 Readout lines Up to 30 MHz out freq.

MicrOmega IR breadboard illumination sample cold finger electronics detector

Radiator Detector AOTF Imaging Optics Sample Baffle MicrOmega IR breadboard

MicrOmega IR: smectite sample smectite sample size = 6 x 7.5 mm² MicrOmega spectrum bining 3X3 (69 x 69 µm 2 )

MicrOmega spectrum bining 3X3 (69 x 69 µm 2 ) lab (LPG) spectrum 4 cm² size sample

Nontronite + Kieserite mixture Sample MicrOmega Spectrum binning 3X3 USGS Reference NONTRONITEKIESERITE

MicrOmega / ExoMars MicrOmega is ready to pass (in two weeks) its PDR successfully, and could have been delivered for a 2013 launch. The unfortunate shift decided last week by ESA to be endorsed by the C/MIN late November might lead to a consolidated mission, towards a robust partnership in the upcoming joined missions. Phyllo workshop, Paris, October22, 2008