Detection of mechanical instability in DI-fluxgate sensors

Lars W. Pedersen, Jürgen Matzka

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsResearchpeer-review

193 Downloads (Pure)


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
Publication date2012
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


WorkshopXV IAGA Workshop on Geomagnetic Observatory Instruments Data Acquisition and Processing
CitySan Fernando, Cadiz
Internet address

Fingerprint Dive into the research topics of 'Detection of mechanical instability in DI-fluxgate sensors'. Together they form a unique fingerprint.

Cite this