Computer Science
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1749k&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1749
Computer Science
Scientific paper
We report on the development and first results from a bore-hole permittivity probe to be used on the surface of Mars. A permittivity probe covering the frequency range of 4 - 20 000 Hz with a 1 Hz resolution was developed as part of the HP3 instrument. The sensor approach follows the classical concept of a Wenner array [1] of equally spaced electrodes wrapped around the outer envelope of the HP3 payload compartment, where an electrical field is projected into the adjacent material. With the two receiver electrodes this field is measured back and compared with the output signal. From amplitude and gain changes the electrical properties of the ambient material can be inferred. For calibration, measurements were performed with three different environmental stable polymers, namely polyethylene (PE), polymethyl methacrylate (PMMA) and polytetrafluoroethylene (PTFE). We also used assorted Martian analogue materials As reference values for the sample permittivity data gained from a high precision impedance spectrometer were used. In comparison to common literature values and the reference samples, an accuracy of better than 5% can be achieved with the calibrated sensor breadboard for frequency ranges > 1 kHz.
Berghofer G.
Kargl Guenter
Stiegler Alexander
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