Chongqing Gold Mechanical & Electrical Equipment Co.,Ltd
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2D Electrical Resistivity Tomography Geophysical Resistivity System
The mutil-electrode geophysical resistivity system used an array exploration method, also known as the automatic resistivity system. It is the development of the direct current method, which is equivalent to the combination of 4 poles vertical electrical sounding and electrical profile method. The artificial electric field is formed by electrode power supply to the underground, and the distribution of the electric field is closely related to the distribution of the resistivity of the underground geotechnical medium. By measuring the artificial electric field of different parts of the surface, the distribution of the visual resistivity of the underground medium is understood, and the underground geological structure is inferred and explained according to the distribution of the visual resistivity of the geotechnical medium.
2D Electrical Resistivity Tomography is particularly sensitive to the water content of surrounding rock. If the surrounding rock is broken, the apparent resistivity is significantly reduced, and the visual resistivity of complete and hard rock and soil is significantly higher than that of fault zone or fracture zone and water-rich zone. This method has clear principle and intuitive image, and is a geophysical exploration method with high resolution. In recent years, with the improvement of computer data acquisition technology, the exploration efficiency has been greatly improved, the coverage area and detection depth of the section have been increased, the reliable data can be obtained in the environment of strong interference, the signal-to-noise ratio has been greatly improved, and the geological body can be accurately detected. This method has been widely and successfully used in engineering and hydrogeological exploration and mineral and water resources exploration.
Technical specification
| Receiving part | |
| Voltage channel | ±6V |
| Measurement accuracy | Vp≥10mV时,±0.5% ±1 character Vp< 10mV时,±1% ±1 character |
| Input resistance | > 50 MΩ |
| Apparent polarizability measurement accuracy | ±1% ±1character |
| Sp compensation range | ±1V . |
| Current channel | 5A |
| Measurement accuracy | Ip≥ 10mA时,±0.5% ±1character Ip< 10mA时,±1% ±1character |
| The suppression of 50Hz power frequency interference (common mode interference and differential mode interference) is better than 80dB | |
| Launch part | |
| Maximum transmit power | 4500W |
| Maximum supply voltage | ±900V |
| Maximum supply current | ±5A |
| Power supply pulse width | 1~60 seconds, the duty ratio is 1:1 |
| Other | |
| Operating temperature | -10°C~ +50°C, 95%RH |
| Storage temperature | -20°C~ +60°C |
| Instrument power supply | No. 1 battery (or nickel-cadmium battery of the same specification) 8 pieces |
| Current current | ≤55mA |
| Weight | ≤7KG |
| Volume | 310mm*210mm*210mm |
| WDZJ-3 multi-channel electrode converter | |
| Converting the number of electrodes | 60 road
|
| Insulation properties | ≥500 MΩ |
| Maximum working voltage | 450 VDC |
| Maximum operating current | 2.5 ADC |
| Instrument power supply | No. 1 battery (or nickel-cadmium battery with the same specification) 8 pieces |
| Operating temperature | -10°C~ +50°C |
Measurement Data
Product Details
Application
By using 1D resistivity sounding, 1D induced polarization sounding, 2D Electrical resistance tomographic, this system is widely used in:
1. Water resources, metal and nonmetal mineral resources detection.
2. City geophysical exploration, railway and bridge inspection.
3. Hydrology and engineering geology as inspecting dam base and flood protection levee for incipient faults.
4. Geothermal prospecting
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