1000m Underground Water Detection Time-Domain Electromagnetic Survey System
Principle
The transient electromagnetic method, called TDEM (Time-Domain Electromagnetic Method) belongs to the group of active electromagnetic methods.
The transient electromagnetic method, called TDEM (Time-Domain Electromagnetic Method) belongs to the group of active electromagnetic methods,transient electromagnetics (TEM) method was developed in order to gain information on the subsurface resistance-conductivity. It is applied successfully in mineral and geothermal exploration, in hydrogeology, environmental surveys and the like.
The measurement depth ranges between a few and more than 1000m. Measuring depth depend on the size of the used transmitter’s power transmission loop; and the strength of the interference caused by the environment
Techenical Specification
| Transmitting voltage |
≤200V3 |
| Transmitting current |
≤50A |
| Current measurement precision |
current range before power supply being cut off is 0~50A, display resolution is 0.01A. |
| 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 |
1μs~1000μs |
| Turn-off time |
≤1.2μs (pure resistance), changing with the transmitting current and transmitting coil when connecting to the coils |
| Damping resistance |
1000Ω |
| Transmitting coil |
0.1km×0.1km single turn ~ 2km×2km single turn |
| Synchronization mode |
external synchronization (cable, GPS) |
| Power supply |
internal 12V8.6Ah rechargeable battery (or external 12V power supply) lasting for over 10 hours |
| Dimension |
525×436×217mm3 |
| Weight |
18.5kg |
| Working temperature |
-10°C~+50°C |
| |
Receiver |
| Number of channel |
1 |
| Pre-amplification gain |
8, 32 times |
| Main amplification gain |
1, 2, 4, 8, 32, 64, 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 |
1μs |
| Trace number |
≤128 |
| Stacking times |
1~9999 time |
| Synchronization mode |
internal 12V9.6Ah rechargeable battery (or external 12V power supply) lasting for over 10 hours |
| 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 |
340×295×152mm |
| Weight |
5.3kg |
| Working temperature |
-10°C~+50°C |
Configuration for whole Time-Domain Electromagnetic Survey System
1.WTEM-2J Receiver 1 set
2.WTEM-2D/60 Transmitter 1 set
3.WTEM-2T/GPS Transmitter Synchronized Controller 1 set
4.Touch pad to control the TEM system 1 set
5.PTT-40A Antenna and Adapter 1 set Optional
Product Image
Your message must be between 20-3,000 characters!
