2007/09/10 by Andrew Sunderland, Li Ju, Sunderland, Andrew +6
Earth and Planetary Sciences · Engineering · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Geophysical and Geoelectrical Methods #Magnetic Properties and Applications #Materials Science (cond-mat.mtrl-sci) #Non-Destructive Testing Techniques #cond-mat.mtrl-sci
paper · pdf · doi:10.48550/arxiv.0709.1323
9 pages, 5 figures
openalex publication_date 2007/09/10 · arxiv created 2008/01/07 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.