Computer Science – Sound
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p51d1219s&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #P51D-1219
Computer Science
Sound
5494 Instruments And Techniques, 7294 Seismic Instruments And Networks (0935, 3025)
Scientific paper
The objective of the Mars SEIS experiment is the determination of the deep internal structure of Mars. In particular, geophysical parameters of first importance, such as the state (liquid/solid) and size of the core, as far as structure of the mantle and shape of discontinuities will be determined by the experience. The instrument integrates a Very Broad Band two axis seismometer, completed by a third axis short period seismometer, and environmental sensors for pressure, infrasounds and temperature. The sensors measure signals in an ultra-broad band, from the tidal frequencies (0.05 mHz) up to the short period frequencies (50 Hz). Long term VBB bias will be actively decorrelated from temperature and pressure variations, allowing the sensor to operate in a thermal environment with daily variations of about 40 °K. Infrasounds, which might be associated to dust devils and atmospheric discharge, will be also monitored. The overall mass of the SEIS instrument is under 2 kg, including all sensors, data control processors and installation devices. Acquisition will be performed by a series of 24 bits A/D converters, while the thermal and drift control will be performed by a feedback generated by a 24 bits D/A converter. We are currently at the end of the B phase, with a breadboard of the VBB axis already delivered by industry (EADS-Sodern). Most critical parts have been tested, including shock tests (200g, 20 ms) for pivot, electronics components and displacement sensors. The electronics breadboard has also been delivered and was under extensive performance tests at ETH facilities. The Sphere (phase B Breadboard), including the two VBB axis, has been delivered by industry (EADS-Sodern). Structural and Thermal Model (STM) of Sphere has been delivered at the end of 2005. Full seismic calibration and environmental tests are planned in 2007. Preliminary and functional results are satisfying and noise optimization is under process. Preliminary noise results are encouraging. Tests at lab in seismic vault show that the instrumental noise is equivalent to standard terrestrial seismometers. The SEIS is one of the core instruments of the Geophysical and Environment Package (GEP) included in the baseline of ExoMars mission which has been approved by ESA, with a launching planned in 2011. The idea for the GEP and SEIS is also to built progressively a network on Mars, for several martian years of operation by participating to other NASA missions (2011 and later).
Banerdt B.
Giardini Domenico
Lognonné Philippe
Mimoun David
Pike William T.
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