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Uehara M, Gattacceca J, Quesnel Y, Lepaulard C, Lima EA, Manfredi M, Rochette P. A spinner magnetometer for large Apollo lunar samples. Rev Sci Instrum 2017; 88:104502. [PMID: 29092488 DOI: 10.1063/1.5008905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We developed a spinner magnetometer to measure the natural remanent magnetization of large Apollo lunar rocks in the storage vault of the Lunar Sample Laboratory Facility (LSLF) of NASA. The magnetometer mainly consists of a commercially available three-axial fluxgate sensor and a hand-rotating sample table with an optical encoder recording the rotation angles. The distance between the sample and the sensor is adjustable according to the sample size and magnetization intensity. The sensor and the sample are placed in a two-layer mu-metal shield to measure the sample natural remanent magnetization. The magnetic signals are acquired together with the rotation angle to obtain stacking of the measured signals over multiple revolutions. The developed magnetometer has a sensitivity of 5 × 10-7 Am2 at the standard sensor-to-sample distance of 15 cm. This sensitivity is sufficient to measure the natural remanent magnetization of almost all the lunar basalt and breccia samples with mass above 10 g in the LSLF vault.
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Affiliation(s)
- M Uehara
- CNRS, Aix Marseille Univ, IRD, Coll France, CEREGE, Aix-en-Provence, France
| | - J Gattacceca
- CNRS, Aix Marseille Univ, IRD, Coll France, CEREGE, Aix-en-Provence, France
| | - Y Quesnel
- CNRS, Aix Marseille Univ, IRD, Coll France, CEREGE, Aix-en-Provence, France
| | - C Lepaulard
- CNRS, Aix Marseille Univ, IRD, Coll France, CEREGE, Aix-en-Provence, France
| | - E A Lima
- Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | | | - P Rochette
- CNRS, Aix Marseille Univ, IRD, Coll France, CEREGE, Aix-en-Provence, France
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