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Publications

GEM-2 & GEM-3 handheld

The GEM-2 - How it works
The GEM-2 - How it works - Detailed
Small frequency-domain EM induction sensors 
Depth of Investigation for small EM sensors 
The GEM-2 multi-frequency EM sensor 
GEM-2: detecting pipelines and sinkholes 
Real-time resistivity sounding with a GEM-2 
The GEM-3 broadband EM sensor 
GEM-3M: A Ground Imager with a Local Navigator 

Soil and Groundwater Contamination links

Ohio EPA fact sheet - Soil contamination surveys 
Commercial soil impact assessment with the GEM-2 
Ground Electromagnetic Survey (GEM-2) of subsurface hydrocarbon contaminant dispersion 
Feasibility Study on Using the Electromagnetic Method to Locate Abandoned Brine Wells 
Multi Frequency EM Surveys of Near-Surface Migration Pathways Surrounding a CO2 Injection well 
Reynolds International Technical Summary Sheet: GEM-2 electromagnetic ground conductivity mapping 

Underground Surveys

Detecting and imaging hard-to-find abandoned wells and pipelines 
Comparison of detection of various undreground structures 
Cloud chamber buried pipe detection with a GEM-2.pdf 
Electromagnetic detection of buried metallic 
EM detection of buried metallic objects 
Electromagnetic Induction Spectroscopy (EMIS) 

Detection of mines and ordnance

Geophysics and weapons inspection 
EMIS_for clearing landmines.pdf 
Automated anomaly picking in a UXO survey 
Automated Identification of Buried Landmines 
Ordnance/clutter discrimination based on Eigenvalue analysis 
Resolving power of geophysical methods for UXO detection 
Spectral identification of buried UXO ordnance 
Characterization of UXO-Like Targets 
Identification of Buried Unexploded Ordnance 

Undersea Applications

Seafloor characterization by EM benthic profiling (POSTER) 
Mapping of marine surficial sediments by benthic EM profiling 
ROV-towed GEM-3 EM sensor 
Fingerprinting of submarine freshwater seepage 
Measurement of sea ice thickness 

Archaeology & Forensic

Iraq Weapons inspection 
Geophysical surveys in Jordan 
Archaeological studies with EM in Jordan 
Geophysical investigation at cemetery and church 

Airborne

GEM-2A broadband airborne EM sensor 
Identifying near-surface migration pathways with an airborne EM sensor 
Inversion of helicopter EM data 
Dielectric mapping using airborne EM data 
Quad–quad resistivity in airborne EM mapping 
Airborne resistivity and susceptibility mapping 
Identification of mineral deposits using airborne EM spectra  

Theory


GEM-2, GEM-3 and GEM-5 Sensor Configurations
Magnetometers and electro-magnetometers 
Conductivity and susceptibility mapping.pdf 
Mapping of earth with continuous conductivity variation 
Inversion of time-domain airborne EM data 
Differential parameter method for airborne EM mapping 
Imaging underground structures 
Airborne EM mapping 
Airborne resistivity data leveling 
Subsurface imaging with broadband EM 

Other

Diagnosing the_Earth 
Planetary exploration with an EM sensor 

 

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Geophex Ltd.      605 Mercury street, Raleigh NC 27603 U.S.A.       info@geophex.com       Fax: +1 (919) 839-8528       Telephone: +1 (919) 839-8515