Detection of mechanical instability in DI-fluxgate sensors

Lars W. Pedersen, Jürgen Matzka

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    Abstract

    An important part of the declination-inclination (DI) measurement with the theodolite is to calculate the sensor parameters (horizontal and vertical misalignment, sensor offset). It is crucial to track these parameters over time, since the sensor has to be stable to give correct DI results. The Danish Meteorological Institute and now DTU Space have formany years produced DI-fluxgate electronics and used fluxgate sensors from Pandect. Some sensors were found to be
    unstable due to loose ferromagnetic cores inside, i.e., the vertical misalignment changes when the sensor is turned ’upside down’ during the DI-measurement. We have found a way to glue the ferromagnetic cores within the new sensors
    to make them mechanically stable. All sensors are tested very carefully before being used. Since the observed erroneous sensor offset due to loose sensor usually is extremely high, we can use a fast method (called ’double offset’) for a first
    check of the sensor. However, the definitive test of a sensor is the comparison of its offset measured in a zero-field chamber with the offset calculated from an absolute measurement.
    Original languageEnglish
    Title of host publicationProceedings of the XVth IAGA Workshop on Geomagnetic Observatory Instruments, Data Acquisition, and Processing : Extended Abstract Volume
    EditorsP. Hejda, A. Chulliat, M. Catalan
    PublisherIAGA
    Publication date2012
    Pages61-64
    Publication statusPublished - 2012
    EventXV IAGA Workshop on Geomagnetic Observatory Instruments Data Acquisition and Processing - San Fernando, Cadiz, Spain
    Duration: 4 Jun 201214 Jun 2012
    Conference number: 15
    http://iaga_workshop_2012.roa.es/

    Workshop

    WorkshopXV IAGA Workshop on Geomagnetic Observatory Instruments Data Acquisition and Processing
    Number15
    Country/TerritorySpain
    CitySan Fernando, Cadiz
    Period04/06/201214/06/2012
    Internet address

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