tTEM 2x4
The tTEM 2x4 system is a towed, ground-based, transient electromagnetic system, designed for detailed 3D geophysical and geological mapping of the shallow subsurface (0-80 m) in a fast and cost efficient way. The detailed 3D coverage is obtained by fast data repetition and a small line spacing of typically 10-20 m.
The tTEM system is quick to deploy and easily managed by a field crew of two persons. The tTEM-system consists of an ATV, carrying the instrumentation and towing the transmitter frame and the receiver coil. The transmitter and receiver coils are mounted on sleds for a smooth ride over rough fields/terrain.
The tTEM data processing is fully integrated with the Aarhus Workbench software package.
Transmitter and receiver specifications
Tx Current*
Tx Peak moment*
Repetition frequency*
Raw Data Stack size*
Raw Moment cyclus time*
Tx on-time*
Duty cycle*
Turn-off time*
Number of gates*
Gate time interval*
Front-gate time (nominal)*
Front-gate delay*
Parameters listed are related to operations in 50 Hz powerline areas. Slight modifications are made when operating in 60 Hz environments.
Low Moment
~ 2.8 A
~ 22.4 Am
2110 Hz
422
0.22 s
0.2 ms
42 %
2.5 us
4
4 us – 10 us
2.0 us
1.9 us
High Moment
~ 30 A
~ 240 Am
660 Hz
264
0.40 s
0.45 ms
30%
4.0 us
23
10 us – 900 us
5.0 us
1.9 us
2
2
Dimensions of system
Transmitter area:
Width of runners:
Length of runners:
Distance between runners:
2 m x 4 m
5 cm
90 cm
80 cm
