Geophysical Exploration Instrument Electrical Resistivity Imaging
Meter
Introduction
2D Resistivity Imaging uses an array of electrodes (typically 60/
120) connected by multicore cable to provide a linear depth
profile, or pseudosection, of the variation in resistivity both
along the survey line and with depth.
Except the above mentioned differences on parameters and connection
of solid non-polarized electrodes, multi-electrode 2D resistivity
imaging system and 2D IP imaging system are the same on instrument
operation, please refer to operation guide to the multi-electrode
2D resistivity imaging system in Section Seven.
ERI: means Multi-electrode electric Res imaging method, which is
the extension of 1D Res VES. Layout dozens or hundreds electrode on
one survey line, with automatic conversion of control electrode,
the instrument completes automatic composition and fast measurement
of many kind of array and program in Res method. It realizes
combined measurement of electric profiling and electric sounding
and is benefit for shorten time and gaining section information.
IP ERI: means Multi-electrode IP imaging method, which is the
extension of IP method measurement. Layout dozens or hundreds
electrode on one survey line, with automatic conversion of control
electrode, the instrument completes automatic composition and fast
measurement of many kind of array and program in IP method.
Application
- Mineral prospecting in geological surveys - identify potential
mineral deposits.
- Groundwater exploration - locate and assess water resources.
- Environmental investigations - identify contamination and
remediation sites.
- Engineering projects - determine foundation stability and soil
mechanics.
- Archaeological studies - detect buried structures and artifacts.
- Civil engineering - determine soil composition and geotechnical
properties.
Specification
WGMD-9 system configuration table:
Function
System | System model | Host machine | Converter | DC high voltage power | Cable & Electrode |
| Centralized 2D multi-electrode Res Survey | WGMD-9 | WDA-1 | WDZJ-4/ WDZJ-120 | External | Centralized cable and electrodes |
| Distributed 2D/ 3D multi-electrode Res survey | WGMD-9A | WDA-1 | N/M | External | Distributed multi-electrode Res survey cable and electrodes |
| Distributed 2D multi-electrode Res & IP survey | WGMD-9B | WDA-1 | N/M | External | Distributed multi-electrode Res & IP survey cable and electrodes |
| Cable | 5m space cable, 10m space cable(optional) |
Host machine(WDA-1) parameter:
| Receiving part |
| Voltage channel | ±32V(24 bit A/D) |
| Measurement accuracy | Vp≥5mV, ±0.2% ±1 character, 0.1mV≤Vp<5mV, ±1% ±1 character |
| Input impedance | >50MΩ |
| Apparent polarization accuracy | ±1%±1character |
| SP compensation range | ±10V |
| Current channel | 6A(24bit A/D) |
| Measurement accuracy | Ip≥5mA, ±0.2% ±1character, 0.1mA≤Ip≤5mA, ±1% ±1 character |
| As for 50Hz industrial interface(common and different
mode)depression | Better than 80dB |
| Transmitter part |
| Maximum power | 7200W |
| Maximum supply voltage | ±1200V |
| Maximum supply current | ±6A |
| Supply current width | 1~60s, duty rate 1:1 |
| Others |
| Working temperature | -10℃~+50℃, 95%RH |
| Storage temperature | -20℃~+60℃ |
| Power supply | Built-in 7.4V4Ah(or outside 12V), lasting for 20h |
| Main unit port | A, B, M, N, DC high voltage, outside battery, 2 cable port, RS-232,
blue tooth |
| Weight | ≤4kg |
| Dimension | 270mm*246mm*123mm |
| Pocket PC |
| Windows mobile 5.0 system, 624MHz, 640*480 true color, 128MB Flash
ROM /64MB SDRAM, 512MB CF card, Blue-tooth, infrared, serial port,
2 rechargeable batteries, with Word, Excel. |
Certificate
