Differential readout for a magnetic gradiometer

    Research output: Contribution to journalArticle

    Abstract

    A magnetic gradiometer system being developed by the authors uses a vibrating string as its sensing element. The next generation of sensor will use a wide ribbon instead of a string. In order to precisely measure the displacement of the ribbon we have designed a new differential capacitive readout with displacement noise below 10−13 m/. Two capacitive plates are placed at the one quarter and three quarter positions adjacent to the ribbon. An inductor is added in series to make an LC series circuit. Displacement is determined by measuring the phase. From a scan of phase versus frequency, the linear dynamic range is measured to be ∼360 nm. The LC series readout is highly immune to stray capacitance and is designed for use with long cables in a magnetic gradiometer system.
    Original languageEnglish
    Pages (from-to)5-12
    JournalSensors and Actuators A: Physical
    Volume153
    Issue number1
    DOIs
    Publication statusPublished - 2009

    Fingerprint

    gradiometers
    Magnetometers
    ribbons
    readout
    strings
    Cables
    Capacitance
    inductors
    cables
    dynamic range
    Networks (circuits)
    Sensors
    capacitance
    sensors

    Cite this

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    title = "Differential readout for a magnetic gradiometer",
    abstract = "A magnetic gradiometer system being developed by the authors uses a vibrating string as its sensing element. The next generation of sensor will use a wide ribbon instead of a string. In order to precisely measure the displacement of the ribbon we have designed a new differential capacitive readout with displacement noise below 10−13 m/. Two capacitive plates are placed at the one quarter and three quarter positions adjacent to the ribbon. An inductor is added in series to make an LC series circuit. Displacement is determined by measuring the phase. From a scan of phase versus frequency, the linear dynamic range is measured to be ∼360 nm. The LC series readout is highly immune to stray capacitance and is designed for use with long cables in a magnetic gradiometer system.",
    author = "Andrew Sunderland and Alexey Veryaskin and Howard Golden and Wayne Mcrae and Li Ju and David Blair",
    year = "2009",
    doi = "10.1016/j.sna.2009.04.018",
    language = "English",
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    Differential readout for a magnetic gradiometer. / Sunderland, Andrew; Veryaskin, Alexey; Golden, Howard; Mcrae, Wayne; Ju, Li; Blair, David.

    In: Sensors and Actuators A: Physical, Vol. 153, No. 1, 2009, p. 5-12.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Differential readout for a magnetic gradiometer

    AU - Sunderland, Andrew

    AU - Veryaskin, Alexey

    AU - Golden, Howard

    AU - Mcrae, Wayne

    AU - Ju, Li

    AU - Blair, David

    PY - 2009

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    AB - A magnetic gradiometer system being developed by the authors uses a vibrating string as its sensing element. The next generation of sensor will use a wide ribbon instead of a string. In order to precisely measure the displacement of the ribbon we have designed a new differential capacitive readout with displacement noise below 10−13 m/. Two capacitive plates are placed at the one quarter and three quarter positions adjacent to the ribbon. An inductor is added in series to make an LC series circuit. Displacement is determined by measuring the phase. From a scan of phase versus frequency, the linear dynamic range is measured to be ∼360 nm. The LC series readout is highly immune to stray capacitance and is designed for use with long cables in a magnetic gradiometer system.

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