Gradiometer - Magnetometer

A gradiometer-magnetometer is a dual-function geophysical instrument that combines absolute magnetic field measurement with spatial gradient sensing in a single field-deployable unit. The magnetometer function records the total intensity of the local geomagnetic field at the sensor position, expressed in nanotesla (nT), providing a direct measurement of field strength at a given point in time and space. The gradiometer function simultaneously computes the difference in field readings between two spatially separated sensors mounted along the instrument’s axis, expressing the result as a gradient value in nT per meter. Operating both functions together gives the field operator both absolute field context and localized anomaly isolation within a single data acquisition session.

Sensor configurations in combined gradiometer-magnetometer instruments commonly use fluxgate or optically pumped sensor pairs with inter-sensor separation distances between 0.5 and 1.0 meters. Sensitivity specifications for professional-grade instruments reach 0.1 nT or lower on absolute field measurement and 0.01 nT/m on gradient detection, enabling reliable identification of small ferrous targets including unexploded ordnance, buried metal objects, and subtle geological contacts at depths ranging from 0.5 meters to several meters depending on target mass and soil conditions.

Data acquisition systems integrated into modern gradiometer-magnetometer units record georeferenced readings via onboard GPS, storing position-tagged field data for post-processing and map generation using dedicated geophysical software. Survey configurations include walking surveys with pole-mounted sensors, cart-towed arrays for high-density grid coverage, and vehicle-towed multi-sensor platforms for large-area reconnaissance.

In Pakistan, gradiometer-magnetometer instruments are deployed for UXO and landmine detection, mineral exploration, archaeological prospection, and buried ferrous infrastructure mapping across defense, geological, and civil engineering applications.

Tactical Supply Pakistan supplies gradiometer-magnetometer systems for EOD, geological survey, and infrastructure mapping teams operating across Pakistan.