Geoelectric resistivity meter SEV Vertical Electric Survey Resisitivty Meter Deep Ground Water Detector Resistivity Meter VES, IP, EP, SP, ERT
Product Description
Widely used to distinguish varying resistivity values within the subsurface for applications in landfill investigations, hydrogeological, geological, geotechnical, and downhole logging studies. The basic principle involves injecting a direct current (I) into the ground using voltmeter and current electrodes. As the current travels through the subsurface, it is both resisted and conducted by the materials present. The electrical potential created is then received by the corresponding potential electrodes at the surface.
The basic parts of a resistivity measurement system include a source of electrical current, a voltage measuring system, and the cables to connect these components to the electrodes. These components have undergone major modifications over the years to improve the efficiency of the survey procedure, the quality of the data, and to increase the depth of investigation. The power source for the current is typically a battery for shallow surveys. Some small portable resistivity meter systems for very shallow surveys of up to a few meters depth weigh less than a kilogram. A typical system (with associated cables and electrodes) for environmental and engineering surveys that uses an internal battery. Such systems usually weigh between 10 and 50 kg. The current source and voltage measuring circuitry are integrated into a single unit (the resistivity meter). Such battery-based systems can provide currents of up to about 2 A and have been used for survey depths of up to about 200 m. For deeper surveys where currents of up to 10 A are used, a petrol/diesel engine- powered electric generator is usually used. Such systems can weigh several hundred kilograms, and are commonly used for induced polarization (IP) surveys in mineral exploration. The current transmitter is separate from the receivers that measure the potential signal
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