DeltaEM Gradiometer          

   (see brochure...PowerPoint)

The DeltaEM gradiometer uses magnetic gradiometry to detect surface and subsurface anomalies, such as coal seams and abandoned mines.  .  Spatial gradients of the magnetic field contain important  information about local geologcal features, both man-made and naturally formed.  The gradiometer can  measure both total magnetic fields and gradients of the magnetic field.

 

 

 

 

The DeltaEM gradiometer instrumentation features an electronic design that enables synchronization between the primary field components, which allows the equipment to detect the smallest possible secondary signal in electrical noise.  Gradient antennas with a coherent receiver obtain inherently high sensitivity for the detection range of shallow-buried to deep-buried anomalies.  A global positioning system (GPS) receiver and a radio frequency (RF) modem are integrated into the gradiometer.  The gradiometer sensor data are time and position stamped with information from the GPS.  The RF modem allows wireless communication with the gradiometer receiver.  The use of multiple frequency operation enhances the detection of small-size anomalies.  The entire system is non-intrusive and operates on rechargeable batteries.  Detection in real time with calculated burial depth and location of the anomaly are key parameters in this high-performance system.  The instrumentation can be hand carried, mounted on a vehicle, such as an all-terrain vehicle, or mounted on an unmanned aircraft or a helicopter.

In mining, the system can be used to detect the surface signatures of underground carbonaceous reserves and detect and map underground voids, such as sink holes and pockets of air and water.  The system has other applications as well.  These include commercial and industrial utility-line mapping, inspecting dams and other water impoundments to ensure their integrity, and surface tracking of deeply buried beacon transmitters in search and rescue situations.