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Ground Conductivity Meter

HGG has a GCM system (DUALEM421S), which can be operated on land or water. The GCM system operates at a frequency of 9000 Hz, and has vertical and horizontal receiver coils at distances of respectively 1, 2 and 4 meters from the transmitter. The instrument makes a unique measurement 10 times per second and can be operated by boat, while walking or towed behind a motorized vehicle. A GPS, which is connected to the system, ensures the detailed positioning of the measurements.

The acquisition of GPS and GCM data is controlled by in-house developed software, which ensures data synchronization and easy in-field data evaluation. The GPS positions are linked to a navigation software running on the built in PC. Mapping lines can be plotted and visualized to make sure that the desired line spacing and areal coverage is obtained.

HGG has built several of these acquisition systems. Please enquire for possibilities and read more under Workshop.

Key Specifications

  • 9000 Hz operational frequency
  • Receiver coils in 1, 2 and 4 meters distance from transmitter
  • Positioning and elevation is continuously logged with a GPS
  • Operated by boat, walking or towed behind motorized vehicle 


Test of minimum distance between ATV and GPS - pdf

Christiansen, AV, Pedersen, JB, Auken, E, Soe, NE, Holst, MK & Kristiansen, SM 2016, 'Improved Geoarchaeological Mapping with Electromagnetic Induction Instruments from Dedicated Processing and Inversion', Remote Sensing, bind 8, nr. 12, 1022. https://doi.org/10.3390/rs8121022 - pdf