Transient electromagnetics, (also time-domain electromagnetics / TDEM), is a geophysical exploration technique in which electric and magnetic fields are induced by transient pulses of electric current and the subsequent decay response measured. TEM / TDEM methods are generally able to determine subsurface electrical properties, but are also sensitive to subsurface magnetic properties in applications like UXO detection and characterization. TEM/TDEM surveys are a very common surface EM technique for mineral exploration, groundwater exploration, and for environmental mapping.
TEM/TDEM systems consist of a transmitter instrument, transmitting coil or transmitting wire, receiver coil or antenna, and receiver instrument.
Main Functions and Features
1. All-round optimization of WTEM-2J receiver: Except for the power switch, all operations are carried out in pocket PC through Bluetooth.
2. Improved WTEM-2T/GPS transmitter synchronized controller: a better GPS module and antenna with higher sensibility, faster in synchronization speed, compacter in size and lighter in weight.
3. Support several synchronization mode: cable synchronization GPS synchronization“GPS + Clock” synchronization (optional) When GPS satellite signal is very weak or disappears, the quartz crystal will perform synchronization with error less than 1μs/hour.
4. Wide range of sounding depth: WTEM-1D transmitter can help to perform medium-deep or deep exploration in tens of meters to thousands of meters.
WTEM-2T/GPS Transmitter Synchronized Controller (Optional)
Frequency support: 0.0625Hz, 0.125Hz, 0.25Hz, 0.5Hz, 1Hz, 2Hz, 4Hz, 8Hz, 16Hz, 32Hz
Synchronization error: ≤250ns
Available satellite (max.): 12
Synchronization time needed: ≤40s
Working current: ≤170mA
Power supply: internal 7.4V4Ah rechargeable battery (support 12V external power supply) lasts for over 20 hours.
Working temperature: -10°C~+50°C
PTT-40A Receiver Antenna & Adapter (Optional)
Equivalent area: equivalent signal of 2000m2 or 4000m2 area (select through the switch on the adapter)
Bandwidth: 100k Hz
Output impedance: 100Ω
Power source: internal lithium batteries (voltage 14~16.8V)
Weight: adapter 1.1kg, antenna 6.5kg
Dimension:(adapter) φ80mm×250mm; (antenna) 950mm × 950mm × [200~250mm adjustable]