Reducing the magnetic susceptibility of parts in a magnetic gradiometer

Details Reducing the magnetic susceptibility of parts in a magnetic gradiometer Reducing the magnetic susceptibility of parts in a magnetic gradiometer

2007-09-10

arxiv.org/abs/0709.1323v2

Physics

Condensed Matter

Materials Science

9 pages, 5 figures

Scientific paper

In this paper we report a detailed investigation of a number of different materials commonly used in precision instrumentation in the view of using them as critical components in the magnetic gradiometer. The materials requirement inside a magnetic gradiometer is stringent because the presence of magnetic susceptible material will introduce intrinsic errors into the device. Many commercial grade non-magnetic materials still have unacceptably high levels of volume magnetic susceptibility between 0.001 and 0.0001. It is shown here that machining with steel tools can further increase the susceptibility by up to an order of magnitude. The ability of an acid wash to remove this contamination is also reported. Washing in acid is shown to reduce the variation of volume susceptibility in several commercial grade plastics which already have low values of susceptibility.

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