Results from a novel direct magnetic gradiometer

Andrew Sunderland, Howard Golden, Wayne Mcrae, Alexey Veryaskin, Li Ju, David Blair

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    Development is continuing on a novel direct magnetic gradiometer that uses a string as its single sensing element. A string driven by an AC current and vibrating in its second order ‘S’ shaped mode is used to directly measure the magnetic gradient. The sensitivity is measured to be 0.4 nT/m/√Hz in the laboratory. Long-term drift is very low, and static measurements are made in the field with precision 0.2 nT/m. Laboratory measurements of moving iron spheres of various volumes demonstrate the accuracy of the sensor. By combining the sphere measurements with forward modelling of a hypothetical mineral deposit, we illustrate the utility of the gradiometer for airborne surveying. A 20 m line survey on the ground demonstrates the performance of the gradiometer in the field. These experimental and numerical results indicate that such a system is potentially viable for airborne and ground deployment and there is no reason the sensor could not be used in other applications.
    Original languageEnglish
    Pages (from-to)222-226
    JournalExploration Geophysics
    Volume40
    Issue number2
    DOIs
    Publication statusPublished - 2009

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