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GEM - Vector Magnetometers
The dIdD Suspended Magnetometer for accurately measuring the changing Declination and Inclination of the Earth’s Field. In the past, magnetic observatories relied on a combination of Overhauser, fluxgate and theodolite instruments for obtaining measurements. GEM then introduced the dIdD (delta Inclination/delta Declination) system for high precision results. Next, dIdD was enhanced significantly with the development of the Suspended dIdD system.
Declination & Inclination Vector Magnetometer
GEM Systems latest development in this field is the Absolute Magnetic Declination & Inclination (DI) Meter. This instrument is being designed to provide a measurement of Declination and inclination at a given location on the globe. This system is an adaptation of the dIdD vector magnetometer, this system will eliminate the need for a theodolite, by determining declination and inclination (not just changes in inclination / declination).
GEM’s declination-inclination instrument is an Overhauser magnetometer with 2 sets of bias coils (horizontal & vertical) in the magnetic north plane.
The new instrument (DI) simplifies setting observatory magnetometers by eliminating the need for fluxgate magnetometers and thermal insulating structures as before, and now a theodolite system.
As described by the Israeli Nuclear group, Soreq, the dIdD is a vector magnetometer offering monitoring of the inclination and declination as well as total intensity of the earth’s magnetic field. Resolution is 0.01 nT with a recording interval of 5 samples per second.
The Suspended dIdD instrument provides key benefits;
- provides 5 measurements
- Minimal drift
- Simplified observatory setup
- Minimized ongoing system calibrations
- Continuous, stable measurement
- Reliability
- Compact size