Physics
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990p%26ss...38..567k&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 38, April 1990, p. 567-573.
Physics
5
Cometary Atmospheres, Low Speed, Particle Collisions, Piezoelectric Gages, Space Environment Simulation, Audio Signals, Calibrating, Cosmic Dust, Ice, Particle Size Distribution, Physical Properties, Piezoelectric Ceramics, Signal Processing, Sunlight
Scientific paper
Particle detection and characterization by piezoceramic acoustic detectors was tested for low-velocity impacts of ice/dust particles with respect to comet simulation (KOSI) experiments. In these experiments ice/dust samples consisting of water and carbon dioxide ice, as well as mineral dust grains are irradiated with simulated solar light. As a consequence the sample emits particles in a wide size range up to a few millimeters. To detect these particles and to get information on their physical parameters like size, momentum, mass, and velocity, acoustic detectors are used. It has been shown that piezoceramic detectors are suitable for characterizing low-velocity particle impacts at speeds of about 1 m/s and at particle diameters greater than 200 microns. Agglomerates with high porosities (filamentary sublimate residues) show only weak and complex piezoelectric signals because of their inhomogeneous momentum transfer to the acoustic detector during impact processes. It has been shown that at least some fraction of emitted particles in the KOSI experiments still contains a large amount of icy constituents.
Gruen Eberhard
Kohl Harald
Weishaupt Ulrich
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