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| Environmental Technology Listing |
Title of Listing: | | GEM-2 and GEM-3 |
Category: | | Characterization Technologies |
Subcategory: | * | Waste, Soil, All Listings |
Media: | | Sediment, Groundwater, Soil, Leachate |
Contaminants: | | Resistivity, Corrosivity, Buried Ferrous and Non-Ferrous Materials |
Web Site: | | http://www.geophex.com |
Email: | | keiswetter@geophex.com |
Technology Description: | |
Geophex, Ltd. has developed a family of electromagnetic instruments that operate in a broadband multifrequency mode. The first sensor, Model AEM-1, a helicopter-towed unit weighing about 220 pounds, was built and successfully tested in 1988 for the U.S. Navy for airborne bathymetric surveys over the shallow ocean. The first hand-held version, GEM-1 weighing about 12 pounds, was built in 1992 and was successfully used for many environmental site characterization surveys for landfills, unexploded ordnance, and buried drums containing hazardous waste.
GEM-2, completed in 1995, weighs nine pounds and operates in a frequency band between 300 hertz to 18 kHz. The GEM-2 is designed for optimum field efficiency. Geophex has licensed Geophysical Survey Systems, Inc. (GSSI) to produce the commercial version of GEM-2. The newest version, GEM-3, improves the selectable bandwith, sample rate, and transmitter-dipole moment and decreases the sensor footprint.
Using the GEM technology, a single operator can survey a one (1) acre site at five-foot line spacings is one (1) hour. The multifrequency data are stored internally and downloaded to a PC-based field computer for processing, display, and analysis.
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Performance Status/
Limitations: | |
Performance Status:
The GEM sensor technology has been available for approximately 2 years. No commercial systems are currently available, but are anticipated in 1997.
The GEM sensors have been used successfully for the detection of near surface ordnance for the Department of Defense. Successful detection was accomplished at a site demonstration conducted under contract with the Navy Explosive Ordnance Disposal Technical Center conducted at Jefferson Providing Grounds located in Indiana.
No permits are required for operation of the GEM sensors.
Limitations:
As with other EM systems, the GEM sensors are affected by ground conductivity. However, in-field frequency change capabilities of the sensors allows correction for interferences at the site.
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Topics
Electromagnetic Fields (EMF), Geophysics, Technologies, Characterization
Additional Topics/Tags/Keywords
Electromagnetic Subsurface Sensor, Stratigraphy, Water Table |
Organization: | | Geophex, Ltd. |
Address: | | 605 Mercury Street
| Phone: | Description | Number |
City: | | Raleigh | | Primary | (919) 839-8515 |
State/Province/Territory: | | NC | 2. | | |
Zip/Postal Code: | | 27603 | 3. | | |
Country: | | United States | 4. | Fax: | (919) 839-8528 |
Branch Locations: | |
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