WTEM-2 Deep Transient Electromagnetic System
WTEM-2 Medium-Deep/Deep Time Domain TEM Exploration System applies to medium-deep/deep transient electromagnetic sounding exploration. It features high power, short turn-off time, high reliability, strong anti-interference performance, lightweight, and low power consumption. The system is composed of WTEM-2J TEM Exploration System Receiver, WTEM-2D/60 High-power Transmitter, WTEM-2T/GPS Transmitter Synchronized Controller, the PTT-40A Antenna & Adapter, and one Touchpad.
An electromagnetic survey is based on the reaction of the ground to the propagation of electromagnetic fields made up of an alternating electric intensity and magnetizing force. The transient electromagnetic (TEM) method was developed in order to gain information on the electric resistivity of the subsurface. It is applied successfully in mineral and geothermal exploration, hydrogeology, and environmental surveys.
The more current development of time-domain electromagnetic systems, also known as transient electromagnetic (TEM) methods, offers considerable advantages over conventional electromagnetic systems. In the TEM system, signals are transmitted, and the transient decay of the resultant secondary field is recorded after the primary domain has been switched off. Many TEM systems generate a train of primary pulses with measurements made in the interval between each pulse. Applications of TEM are especially the domains of groundwater and landfill surveys, mineral and geothermal exploration, and the detection of burning coal beds.
Function:
Configuration:
Central Loop Configuration
Dipole Loop Configuration
Large Loop Configuration
Application:
- Hydrogeology
- Geothermal Prospecting
- Mineral Exploration
- Engineering Geology
- Geological Mapping
Software Analysis:
Contour map of apparent resistivity of 35 survey linesAcquired by 2*2m100-turn receiving coil
Contour map of apparent resistivity of 35 survey lines, stake No. 500~700 WTEM system
Contour map of the apparent resistivity of 35 survey lines, stake No. 250-600WTEM-1/GPS system
Features:
- Improved WTEM-2T/GPS transmitter synchronized controller: a better GPS module and antenna of higher sensibility is integrated, faster in synchronization speed, compacter in size and lighter in weight.
- High reliability, low power consumption: refined receiver and circuitry, sealed and rugged mechanical structure, ensuring high reliability, low power consumption and convenient operation.
- High reliability, low power consumption: refined receiver and circuitry, sealed and rugged mechanical structure, ensuring high reliability, low power consumption and convenient operation.
- Remote control: it is the first receivers that take use of a pocket PC and Bluetooth wireless communication technology which enable it to control the WTEM-2J receiver 10 meters, such as setting up parameters, starting measuring, transferring and displaying the measured results.
- Multiple channels, high measurement accuracy: operator could set number of channel, linear or logarithmic; crystal oscillator accomplishes timing, with stable and precise time-to-depth ratio. Sampling window arrangement is reasonable, imaging the true subsurface structure. It provides references to complex geological problems.
- Short turn-off time: transmitter support swift turn-off function, able to extend shallow exploration range. Short turn-off function provides software with accurate turn- off time to enable it to give accurate data.
- Friendly and powerful control interface: PDA control and collects data from human-machine interface, such as parameters input, data display or storage, graph plotting, etc, simplifying fieldwork.
Specifications:
| WTEM-2D/60 Transmitter | |
| Transmitting voltage | 12V～200 V DC |
| Transmitting current | ≤60A |
| Current measurement precision | ±1% |
| Power supply frequencies | 0.0625Hz, 0.125Hz, 0.25Hz, 0.5Hz, 1Hz, 2Hz, 4Hz, 8Hz, 16Hz, 32Hz |
| Transmitting waveform& | +ON, OFF, -ON, OFF, equal width and dual polarity |
| Turn-off delay time | 160ns (Pure resistance load) |
| Damping resistance | 1000Ω |
| Transmitting coil | 0.1km* 0.1km single turn ~ 2km*2km single turn |
| Synchronization mode | external synchronization (cable, GPS, Quartz clock) |
| Power supply | internal 12V8.6Ah rechargeable battery (or external 12V power supply) lasting for over 8 hours |
| Dimension | 486 * 392 * 192 mm |
| Weight | 12.7kg |
| Working temperature | -10°C~+50°C |
| WTEM-2J Receiver | |
| Number of channel | 1 |
| Pre-amplification gain | 32 times |
| Main amplification gain | 128 times |
| Band-pass | 0~50k Hz (liner phased filter), full band-pass 0~400k Hz |
| Suppression | 80dB |
| A/D | 16 bit |
| Min sample interval | μs |
| Trace number | ≤128 |
| Stacking times | 1~9999 time |
| Synchronization mode | cable, GPS, GPS+ quartz clock |
| Power source | internal 12V rechargeable battery (or external 12V power supply) lasting for about 16 hours work |
| Pocket PC | Windows Mobile 6.0 system with software such as Word, Excel, etc., 320x240 true color, 64MB Flash Rom/ 64MB SDRAM/64MB 2GB CF card, able to store over 200,000 readings of sampled data,2 original rechargeable batteries |
| Ports | Bluetooth, infrared and serial port |
| Dimension | 340mm* 295mm *152mm |
| Weight | 5.3kg |
| Working temperature | -10℃~+50℃ |
| WTEM-2T/GPS Transmitter Synchronized Controller | |
| Power source | Built-in high-capacity lithium battery, working time ≥ 20 hours. |
| Volume | 270mm * 246mm * 123mm |
| Weight | 2.5kg |
Accessories:
PPT-40A Antenna _ Adaptor
TEM Receiver Antenna
