WGMD-9 distributed electrical method system

WGMD-9 distributed super high-density electrical method system

The WGMD – 9 Distributed High – Density Electrical Measurement System is a revolutionary geophysical exploration tool that combines advanced technology with unparalleled functionality. Engineered to meet the diverse needs of modern geoscience, this system offers a suite of features that set it apart from traditional electrical measurement devices.

System components and functions	WGMD-4 Distributed High-density Electrical Method System
Host	WDJD-4 multi-function digital DC induced polarization instrument
Converter or adapter	None
DC high voltage power supply	External
Cable, electrode	Distributed high-density resistivity, IP switch cables, electrodes

Working principle

Resistivity sounding method does not take into account horizontal changes in the subsurface resistivity. While 2d electrical imaging method with the resistivity changes in vertical as well as horizontal directions along the survey line.

Typical 1D resistivity sounding surveys usually involve about 10 to 20 readings, which 2-D imaging survey can finish thousand of points with different configuration. So the working efficiency improved greatly.

Applications

● Energy resource exploration

● City geophysical exploration

● Railway and bridge prospecting

● Metal and non-metal mineral resources prospecting

● City geophysical exploration

● Hydrology and engineering geology to inspect base of dam and flood protection levee for incipient faults

● Geothermal survey

● Landslides and other geological disaster exploration

PS：System can conducts:

● Self-potential survey

● General resistivity/IP VES survey

● Multi-electrode 2D resistivity imaging

● Multi-electrode 2D induced polarization (IP) imaging

● Multi-electrode 3D resistivity imaging

● Typical 1-D resistivity sounding surveys usually involve about 10 to 20 readings, while 2-D imaging surveys involve about 100 to 1000 measurements. In comparison, a 3-D survey might involve several thousand measurements.

Arrays

Features

Exceptional Functionality Tailored for Geophysical Analysis​

• Multi – Parameter Data Acquisition​

The WGMD – 9 is designed to measure a comprehensive range of parameters. It can accurately capture voltage (Vp), current (Ip), apparent resistivity (ρs), self – potential (SP), apparent polarizability (m~m7), metal factor (G1~G7), half decay time (Th), deviation (R), induce polarization ratio (J), and voltage decay curve data. This multi – parameter approach provides geophysicists with a more complete understanding of the subsurface structure, enabling more accurate interpretations and predictions.​

• High – Power Performance for Deep Penetration​

With a maximum power output of up to 9000W (1500V * 6A) in 1D sounding and 4000W (1000V * 4A) for 2D/3D imaging, the system can penetrate deep into the earth’s crust. The high – power capabilities, combined with a wide voltage input range of 160Vp – p, make it an ideal choice for high – resistivity regions. This ensures that even in challenging geological environments, the WGMD – 9 can deliver reliable and detailed data.​

• Advanced Bluetooth and Wireless Connectivity​

Featuring state – of – the – art Bluetooth technology, the WGMD – 9 allows for seamless wireless remote control. A tablet PC can be used to operate the system from a distance of up to 10 meters, facilitating easy parameter setting, measurement initiation, result display, and data storage. This wireless functionality not only enhances the user experience but also enables greater flexibility in field operations, especially in areas where traditional wired connections may be cumbersome.​

Distributed System Design for Enhanced Flexibility​

• Intelligent Cable – Based Distributed Architecture​

The WGMD – 9’s distributed system design, centered around intelligent cables, is a game – changer in geophysical exploration. This design eliminates limitations on the quantity of electrodes, providing users with the freedom to adapt to various survey requirements. Whether conducting a small – scale local survey or a large – scale regional exploration, the system can be configured to meet the specific needs of the project.​

• Scalability and Adaptability​

The system’s software is highly flexible, allowing for easy upgrades and extensions. It can expand data storage capacity and enhance collection software functions as needed. Additionally, it can be customized to function as a special multi – electrode electrical instrument, making it a versatile solution for evolving geophysical research and industry applications.​

• Auto Compensation and Anti – Interference Features​

Equipped with auto SP compensation, drift compensation, and electrode compensation (with a maximum compensation of ±10V), the WGMD – 9 ensures stable and accurate measurements. Multistage filtration and signal enhancement technologies, along with suppression against common mode and differential mode interference, further enhance the system’s anti – interface performance. This results in high – precision data, even in the presence of significant external noise.

Detailed description

（一）Features Explanation

● Lightweight and portable

The host integrates the transmitting unit and the receiving unit in one body, with small size and light weight.

● Flexible measurement process control

User-defined power-on time and power-off time controls measuring process. The main frame can also monitor variation of electrode potential automatically. If the parameter exceeds the user-defined over-variation limit, it stops measuring, and wait to measure again until it becomes stable.

● Tablet computer control, powerful functions

Windows 10 tablet computer realizes human-machine interface and acquisition control, acquisition parameter setting, data display and storage, various curve drawing (such as joint profile, joint electrical sounding, Wenner sounding, Schlumberger sounding, and induced polarization attenuation curve, etc.), and can display measurement chromatograms in real time. It is fast and intuitive, and the operation is very simple, which greatly improves the quality and efficiency of field work.

● Dual cable socket design

The host is designed with two cable sockets which enable cross-hole electrode array configuration works without switching control unit, and thus makes themeasuring process much simpler and easier.

● One machine with multiple functions and wide adaptability

The host voltage and current range and small signal accuracy are greatly improved. This design makes it suitable to work with rock sampling tester,high-power IP receiver, general electrical method instrument, IP instrument, water finder, 2D and 3D multi-electrode electrical method instrument, etc.

● Capable of measuring various types of data

It is able to acquire data of voltage (VP), current (IP), apparent resistivity (R0), Self-Potential (SP), apparent polarizability (M~M7), metal factor (G1~G7), half decay time (TH), deviation (r), induce polarization ratio (J), etc.

● Powerful anti-interference technology The multi-stage filtering and signal enhancement technology and the integrated electrical interference suppressor function (with super strong anti-common mode interference and differential mode interference capabilities) make the measurement accuracy high.

（二）Support flexible configuration combination

Item	Parameters
Data Collection System	Distributed 2D and 3D high-density resistivity measurement system
Mainframe	WDA-1 super digital DC electric meter
Resistivity / IP Cable	PDGF-10 Distributed High Density Resistivity Cable
Battery	PDX-100LIII (100V,3Ah,lithium battery) PDX-200LIII (200V,3Ah,lithium battery) PDX-200LV (200V,5Ah,lithium battery) PDX-480 LⅡ (60V～480V, 2.2AH,lithium battery) PDX-1(144V,1.3Ah,Lead-acid batteries)
Electrode	Copper electrode

（三）Different parameter collection, different wiring methods

● 2D Resistivity Imaging

● 2D Resistivity/Induced Polarization(IP) Imaging

● 3D Resistivity Imaging

Specifications

（一）WDA-1 super digital DC electric meter

Receiving section

Item	Parameters
Voltage	±32V (24 bit A/D). If Vp≥5mV, accuracy is ±0.2% ±1LSB If 0.1mV≤Vp<5mV, accuracy is ±1% ±1LSB
Apparent polarizability measurement accuracy	±0.2%±1LSB
Input impedance	＞50MΩ
SP compensation range	±10V
Maximum supply current	6A (24bit A/D with WDZJ-3, no more than 2.5A) If Ip≥5mA, accuracy is ±0.2% ±1LSB If 0.1mA≤Ip<5mA, accuracy is ±1% ±1LSB
Suppression	For 50Hz industrial frequency interference (common mode and differential mode interference), suppression is more than 80dB.

Transmitter

Item	Parameters
Max transmitting power	9000W
Maximum supply voltage	1500V (with WDZJ-3, no more than 450V)
Max current	6A
Transmitting power pulse width	1~60s, duty cycle is 1:1

Other parameters

Item	Parameters
Power supply	Internal 7.4V 4Ah rechargeable battery continuously lasts for 20 hours (or 12V external power supply).
Ports support (transmitting unit)	A, B, M and N connecting ports, DC high voltage input ports and external battery terminals, 2 cable ports, RS-232, Bluetooth.
Working temperature	-10℃~+50℃, 95%RH
Storage temperature	-20℃~+60℃
Weight	≤4kg
Dimension	270mmx246mmx123mm
Internal power source	Maximum voltage 96V (two notches, 48V and 96V); Maximum current is 0.7A.
Tablet computer configuration	Windows 10 64-bit operating system, 2048×1536 retina screen, system memory no less than 2GB, storage capacity no less than 64GB, Bluetooth, USB port.

（二）Distributed 2D, 3D high-density resistivity, 2D high-density IP switch cable (optional)

Item	Parameters
Cable	The sheath is made of wide-temperature polyurethane material, with an outer diameter of Φ7mm
Quantity	Specified by the user when ordering
Number of electrode taps	10/string (each string of cables connects 10 electrodes)
Tap spacing	1~10 meters (specified by the user when ordering)
Switch box size	Φ60mmx110mm (switch box only)
Maximum operating voltage	1000V
Switch voltage measurement resolution	≤0.001mv
Switch voltage measurement accuracy	±0.1%
Maximum operating current	4A
Switch current measurement resolution	≤0.001mA
Switch current measurement accuracy	±0.1%
Voltage channel	±80V
50Hz interference suppression	Better than 140dB
Cable insulation	≥ 1000MΩ/2500V between A and B power lines and between them and low-voltage lines
Cable communication mode	Bidirectional (the host automatically identifies the communication direction, number of cables, and the order of mutual connection. The host can be placed at any position on the measurement line)
Working temperature	-20℃~+70℃
Waterproof level	IP68 (can work in water at a depth of 1 meter)

（三）Distributed 2D, 3D high-density resistivity, 2D high-density IP switch electrodes (optional)

Item	Parameters
Copper electrode	Φ10mm×280mm, with plug-in card
Quantity	Specified by the user when ordering

Case study