Portable Shallow High-Resolution Transient Electromagnetic
TEM design
•Use a single TEM coil for multiplexing to eliminate the mutual inductance of the transceiver coils
• Multi-level current transmission, low current (short off time) transmission to ensure shallow resolution detection, high current transmission to ensure exploration depth
• Dual-channel synchronous detection, strong signal channel to ensure high-fidelity and large dynamic range detection of early TEM signals, weak signal channel to ensure high-fidelity detection of late TEM signals
• Use complex hardware and algorithms to replace complex TEM antennas, and use a single coil to realize TEM signal transmission and reception
• The exploration resolution and exploration depth are equivalent to those of a 40×40m coil, the shallow exploration resolution reaches the meter level, and the maximum exploration depth exceeds 100-200 meters
The overall structure of TEM transient electromagnetic system
Mainly composed of antenna, transmitting system, receiving system, embedded system, wireless transmission module and PC.
Technical Specification
| WTEM-2J/ GPS TEM Exploration system receiver |
| Channel number |
1 |
| Pre-amplifier gain |
8, 32 times |
| Main amplifier gain |
1, 2, 4, 8, 16, 32, 64, 128 times |
| Band pass |
0~50kHz(liner phased filter), full band 0~400kHz |
| A/D bit |
16bit |
| The minimum sample interval |
1 μs |
| Crystal oscillation total error |
≤5*10-9 |
| Trace number |
50 |
| Stack number |
1~9999 |
| Synchronization mode |
(1) Cable synchronization (2)GPS synchronization |
| Power supply |
Built-in 12V rechargeable battery(support outside power), working time≥10 hours |
| Working temperature |
-10℃~+50℃ |
| |
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| WTEM-1D 10KW Large power transmitter |
| Transmitting voltage |
200V |
| Transmitting current |
50A |
| Current measurement precision |
1% |
| Power supply frequencies |
0.0625Hz, 0.125Hz, 0.25Hz, 0.5Hz, 1Hz, 2Hz, 4Hz, 8Hz, 16Hz, 32Hz |
| Transmitting power voltage display |
Liquid crystal display unit V, display resolution 0.1V |
| Working temperature |
-10℃~+50℃ |
Application
Transient electromagnetic method is a new generation of electromagnetic exploration method that is rapidly developing and popularizing because it has many advantages that traditional direct current method cannot match. According to the working airspace, transient electromagnetic method can be divided into aviation transient, ground transient, underground (mining) transient, and marine transient. This article mainly deals with underground transient (mine transient electromagnetic method).
- Groundwater detection. Transient electromagnetic method can be used to find water, distinguish between fresh and salt water, stratify underground electrical properties, and delineate underground water-filled caves;
- Find polymetallic deposits;
- Detection of coal seams and coal seam goaf (collapse) areas and their water-filled areas;
- Detection of steep dips, faults, veins and other geological structures.
System software testing
Product Details
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