Computer Science – Sound
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..930k&link_type=abstract
European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a
Computer Science
Sound
Scientific paper
Future exploration missions like Rosetta, ExoMars and lunar missions will provide in-situ experiments for the investigation of planetary surface properties. The analysis of mechanical vibrations may provide a new means to study the structure and properties of the granular surface layers of terrestrial planets and minor bodies like comets. The Comet Acoustic Surface Sounding Experiment (CASSE) [1] on the Rosetta Lander Philae will try to determine elastic parameters and the structure of the surface layer of the target comet. The acoustic waves propagate along the force bridges in granular material. For its understanding and an improved interpretation of the recorded signals it is necessary to track its propagation path in the material. Polarised waves provide the opportunity to visualise forces in photo elastic gels. Static forces or even strains and stresses resulting from impacts can be detected in these gels. Additionally the wave velocity of acoustic waves is much smaller than in granular sand, it is about 5 m/s. In this way it is possible to visualise impacts on these gels and track the resulting forces in the material on laboratory scales. Currently, we install a 3D experiment with photo elastic gels for the visualisation of static forces and impacts in granular material. A high-speed camera gives us the opportunity to track the stress and strain changes and with this the acoustic waves throughout the material. Starting with bulk material we will compare the forces in the material to the recorded acoustic waves. This should improve our understanding of the detected signals. In future we will transfer this knowledge to acoustic experiments and increase the scientific gain of space missions like Rosetta and ExoMars where it is planned to interpret acoustic signals for planetary surface research. In our presentation we will introduce this method and our first experimental results.
Krause Christian
Sperl Matthias
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