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PZT Dust Impact Monitor (DIM) Onboard Rosetta/Philae: Experimental Results and Theoretical Background

Arnold, Walter and Flandes, Alberto and Hirn, Attila and Krüger, Harald and Loose, Andreas and Sperl, Matthias and Seidensticker, Klaus J. and Fischer, Hans-Herbert (2013) PZT Dust Impact Monitor (DIM) Onboard Rosetta/Philae: Experimental Results and Theoretical Background. IEEE 2013 Joint UFFC, EFTF and PFM Symposium, 22.-25. Juli 2013, Prag, Tschechien.

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Abstract

The Dust Impact Monitor (DIM) experiment on board the Rosetta spacecraft's lander, Philae, is a cube with three sides covered with piezo-electric sensors (total sensitive area: ~ 70 ccm), aimed at measuring the physical properties of millimetric and sub-millimetric dust particles that move near the surface of comet 67P/Churyumov-Gerasimenko. After being launched in March 2004, the Rosetta spacecraft encounters after a 10.5 years flight the comet 67P in mid 2014 and a landing of Philae is planned for mid-November 2014. In this work we study the performance of DIM based on impact experiments and compare the measurements with the sensor's expected theoretical behavior as derived from Hertz' theory of elastic impact. We present the results of impact experiments performed with spherical particles of different densities and elastic properties. We performed three types of experiment: (a) we analyze the performance of the different sensor sides under identical impacts, (b) we investigate the performance of DIM under impacts of different materials and different impact speeds, and (c) we report on the behavior of the DIM sensor with varying impact angle. We discuss the influence of the microstructure of the PZT sensor on the signal strength and its variation with position of the impacting particles. Our results show that the signal strength and the contact times measured with the DIM PZT sensors can be well approximated by Hertz' contact mechanics.

Item URL in elib:https://elib.dlr.de/85699/
Document Type:Conference or Workshop Item (Speech)
Title:PZT Dust Impact Monitor (DIM) Onboard Rosetta/Philae: Experimental Results and Theoretical Background
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Arnold, WalterDepartment of Materials, Saarland University, Saarbrücken, GermanyUNSPECIFIED
Flandes, AlbertoInstituto de Geofisica, Universidad Nacional Autonoma de Mexico, MexikoUNSPECIFIED
Hirn, AttilaMTA Center for Energy Research, Budapest, UngarnUNSPECIFIED
Krüger, HaraldMax-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, GermanyUNSPECIFIED
Loose, AndreasMax-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, GermanyUNSPECIFIED
Sperl, Matthiasmatthias.sperl (at) dlr.deUNSPECIFIED
Seidensticker, Klaus J.Klaus.Seidensticker (at) dlr.deUNSPECIFIED
Fischer, Hans-Herberthans-herbert.fischer (at) dlr.deUNSPECIFIED
Date:23 July 2013
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Rosetta, SESAME, DIM, Hertz'sche Theorie, Elastischer Aufprall
Event Title:IEEE 2013 Joint UFFC, EFTF and PFM Symposium
Event Location:Prag, Tschechien
Event Type:international Conference
Event Dates:22.-25. Juli 2013
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt ROSETTA Instrumente
Location: Köln-Porz , Berlin-Adlershof
Institutes and Institutions:Space Operations and Astronaut Training > User center for space experiments (MUSC)
Institute of Planetary Research > Asteroids and Comets
Institute of Materials Physics in Space > Scientific Experiments MP
Deposited By: Seidensticker, Dr. Klaus J.
Deposited On:26 Nov 2013 08:48
Last Modified:08 May 2014 23:16

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