Chongqing Gold Mechanical & Electrical Equipment Co.,Ltd
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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
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