Computer Science – Sound
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....5841s&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #5841
Computer Science
Sound
Scientific paper
The determination of the deep internal structure of Mars, especially the state and size of the core, the structure of the mantle and shape of discontinuities will be the goal of a the SEIS experiment, which integrates a Very Broad Band 2 axis seismometer, a 3 axis short period seismometer and a serie of environmental sensors for pressure, infrasounds and temperature. We describe the scientific objective of the experiment. We then focuse on the technical description of the package of sensors, which will allow: - to measure signals in an ultra-broad band, from the tidal frequencies (0.05 mHz) up to the short period frequencies (50 Hz) - to perform environmental decorrelations of the temperature and pressure variation on Mars, allowing the sensor to operate in a thermal environment with daily variations of about 40°K - to search for infrasounds which might be associated to dust devils and atmospheric discharge. The overall mass of the SEIS experiment is 2.3 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. Two VBB axis will be delivered by industry at mid 2003 and functional breadboard of sphere (15 cm diameter) containing 2 VBB axis, environmental sensors and electronics will be delivered at the end of 2003. IPGP has the overall responsibility of the experiment and is responsible for the VBB sensor and environmental sensors. ETHZ is responsible for the electronics of the experiment and JPL for the Short Period sensors. The SEIS is one of the core instruments of the Netlander mission, which objective is to deploy in 2009 a network of 4 stations on Mars for one Martian year of operation. This design of "multiparameter station" can be used for other Martian missions (e.g. Mars SmartLander) and a simplified and lighter instrument could also be proposed on other planet with the same gravity (Mercury).
Banerdt B.
Giardini Domenico
Karczewski Jean-François
Lognonné Philippe
Mimoun David
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