3D Resistivity Imaging System Geoelectric Instrument Underground Water Detector Groundwater Mapping Image Water Detector

Introduction

The induced polarization (IP) effect is an electrical response of materials that was discovered during a direct-current (DC) resistivity survey (see Resistivity Method). After the current is injected into the subsurface, the measured voltage does not immediately go to zero but, instead, decays over time. This behavior occurs due to the capacitance of subsurface materials, which allows for the polarization of electrical charges during current injection and release of charge after current is shut off.

The capacitance of subsurface earth materials depends upon physical and electrochemical properties related to minerology/lithology, pore fluid chemistry, and fluid-grain boundary interactions. The IP method, though historically used primarily for prospecting disseminated ore, has become increasingly used in hydrogeophysics.

Technical Sepcification

Receiving unit:

• Voltage channel: ± 6V, precision: if Vp≥10mV, ± 5‰ ± 1LSB; if Vp < 10mV, ±1% ±
  1LSB.
• Input impedance: ≥50MΩ
• Apparent polarizability precision: ±1% ± 1LSB
• SP compensation range: ±1V
• Current channel: 5 A, precision: if Ip≥ 10mA, ± 5‰ ± 1 LSB; if Ip < 10 mA, ±1% ±1 LSB.
• Suppression: ≥80dB for 50Hz frequency industrial and electrical interference(common mode interference or differential mode interference).

Transmitting unit:

• Maximum transmitting power: 4500W (only when conducting general resistivity/IP survey. Regarding multi-electrode resistivity imaging, maximum transmitting power is 1125W which is limited by WDZJ-4 switcher)
• Maximum voltage output: 900V (1800V peak to peak, only for general resistivity/IP survey. Regarding multi-electrode resistivity imaging, maximum transmitting voltage is 450V DC which is limited by WDZJ-4 switcher)
• Maximum current output: 5A (only for general resistivity/IP survey. Regarding multi-electrode resistivity imaging, maximum current output is 2.5A DC which is limited by WDZJ-4 switcher)
• Pulse width: 1~60s, duty ratio 1:1

Others:

• Working temperature: -10℃~50℃, 95 %RH
• Storage temperature: -20℃~60℃
• Mainframe power source: eight size-D dry cells (or nickel-cadmium batteries of the same specification)
• Overall current: ≤ 55mA
• Weight: ≤ 7 Kg
• Dimension (L×W×H): 310mm x 210mm x 210mm
• Working temperature: -10°C~50°C

Main Features

* Transmitting unit and receiving unit are of all-in-one design, portable and lightweight.
* CMOS large-scale integrated circuit, special stand-by mode, compact size, low power consumption.
* System turns off WDJD-3A mainframe automatically if there is no operation in 10
minutes.
* High anti-interference performance and precision, integrated with multistage wave
filtration and signal enhancement technologies.
* In good condition, multi-electrode imaging function can complete measurement of a
552-data-points cross section.
* Automatically achieving compensation of self-potential, drift and electrode polarization.
* Receiving unit supports transient over-voltage protection, transmitting unit supports
* over-voltage protection, over-current protection and AB open-circuit protection.
* Measured curve can be plotted through WDJD-3A mainframe.
* Simple calculator fulfills calculation of geometric factor and other calculations on the spot.

Detail imagings

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