Investigation of Planetary Surfaces by Acoustic Sounding

Details Investigation of Planetary Surfaces by Acoustic Sounding Investigation of Planetary Surfaces by Acoustic Sounding

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000neas.work...22k&link_type=abstract

Near-Earth Asteroid Sample Return Workshop, p. 22

Computer Science

Sound

Acoustic Sounding, Comets, Rosetta Mission, Compression Waves, Actuators, S Waves

Scientific paper

To demonstrate the possibility of investigation of mechanical properties of planetary surface layers by acoustic sounding, the ROSETTA Lander experiment CASSE (Cometary Acoustic Surface Sounding Experiment) is presented. The surface of Comet 46P/Wirtanen is analyzed by means of transmitting and receiving acoustic compressional and shear waves in the frequency range from a few hundred to several kilohertz. The acoustic transmitters (actuators), stacked piezoceramics, and commercial triaxial piezoelectric accelerometers as receivers will be integrated in each of the three feet of the ROSETTA Lander. The interface between the feet and the cometary surface is mostly unknown. To cope with the unknown physical conditions on and in the cometary surface, acoustic wave propagation experiments were made in the different extreme materials, simulating the different cometary conditions. Regolith dust and sand on one hand, and hardened porous ice/dust mixtures on the other side, were studied in the laboratory and outdoors. These experiments make sure, that reasonable signal strength can be expected within these cometary analogous materials. Acoustic sounding experiments could also be applied on astroidal surfaces.

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