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A spinner magnetometer for large Apollo lunar samples.

M Uehara1, J Gattacceca1, Y Quesnel1

  • 1CNRS, Aix Marseille Univ, IRD, Coll France, CEREGE, Aix-en-Provence, France.

The Review of Scientific Instruments
|November 3, 2017
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Summary
This summary is machine-generated.

A new spinner magnetometer measures the natural remanent magnetization of large Apollo lunar rocks. This instrument achieves high sensitivity, enabling the analysis of most lunar samples stored at NASA

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Area of Science:

  • Geophysics
  • Planetary Science
  • Paleomagnetism

Background:

  • Understanding the magnetic field history of the Moon is crucial for planetary science.
  • Previous measurements of lunar rock magnetism have been limited by instrument sensitivity and sample accessibility.

Purpose of the Study:

  • To develop a sensitive spinner magnetometer for analyzing the natural remanent magnetization of large Apollo lunar samples.
  • To enable detailed paleomagnetic studies of lunar rocks stored at NASA's Lunar Sample Laboratory Facility (LSLF).

Main Methods:

  • A custom-built spinner magnetometer utilizing a three-axial fluxgate sensor and a hand-rotating sample stage with an optical encoder.
  • Employing a two-layer mu-metal shield to minimize external magnetic interference.
  • Acquiring magnetic signals synchronized with rotation angles for signal stacking over multiple revolutions.

Main Results:

  • The developed magnetometer achieves a sensitivity of 5 × 10-7 Am2 at a 15 cm sensor-to-sample distance.
  • The instrument is capable of measuring the natural remanent magnetization of nearly all lunar basalt and breccia samples exceeding 10 g in mass at the LSLF.
  • Successful measurement of natural remanent magnetization in large Apollo lunar rocks.

Conclusions:

  • The developed spinner magnetometer is a valuable tool for paleomagnetic investigations of lunar samples.
  • This instrument significantly enhances the capability to study the magnetic history of the Moon using existing Apollo sample collections.
  • The findings contribute to a better understanding of lunar magnetic field evolution.