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| Titel |
Performance of thermal conductivity probes for planetary applications |
| VerfasserIn |
E. S. Hütter, N. I. Kömle |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2193-0856
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Instrumentation, Methods and Data Systems ; 1, no. 1 ; Nr. 1, no. 1 (2012-05-22), S.53-75 |
| Datensatznummer |
250000134
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| Publikation (Nr.) |
 copernicus.org/gi-1-53-2012.pdf |
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| Zusammenfassung |
| This work aims to contribute to the development of in situ instruments
feasible for space application. Commercial as well as custom-made thermal
sensors, based on the transient hot wire technique and suitable for direct
measurement of the effective thermal conductivity of granular media, were
tested for application under airless conditions. In order to check the
ability of custom-made sensors to measure the thermal conductivity of
planetary surface layers, detailed numerical simulations predicting the
response of the different sensors have been performed. These simulations
reveal that for investigations under high vacuum conditions (as they prevail,
e.g. on the lunar surface), the derived thermal conductivity values can
significantly depend on sensor geometry, axial heat flow, and the thermal
contact between probe and surrounding material. Therefore, a careful
calibration of each particular sensor is necessary in order to obtain
reliable thermal conductivity measurements. The custom-made sensors presented
in this work can serve as prototypes for payload to be flown on future
planetary lander missions, in particular for airless bodies like the Moon,
asteroids and comets, but also for Mars. |
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