With the flexibility of both selecting the waveform frequency of the transmitter to suit ground conditions and arranging the 20 receiving channels, during the on-time as well as during the conventional off-time, the AEM system can be focused on the most diagnostic response characteristics of the sought after target.
Airborne Electromagnetic: |
| Manufacturer |
Fugro Airborne Surveys |
| |
|
| Model |
MEGATEM |
| Waveform frequency |
30 or 25 Hz |
90 or 75 Hz |
| Pulse width |
4 ms |
2 ms |
| Loop |
4 turns |
4 turns |
| Loop area |
406 m2 |
406 m2 |
| Dipole moment (approx.) |
1.08 x 106Am2 |
0.97 x 10 Am2 |
| Peak transmitter current |
665 amperes |
595 amperes |
| |
|
| Model |
MEGATEMII |
| Waveform frequency |
30 or 25 Hz |
90 or 75 Hz |
| Pulse width |
4 ms |
2 ms |
| Loop |
4 turns |
5 turns |
| Loop area |
406 m2 |
406 m2 |
| Dipole moment (approx.) |
2.18 x 106 Am2 |
1.71 x 106 Am2 |
| Peak transmitter current |
1340 amperes |
840 amperes |
| 1/2 Waveform sampling rate |
384 per pulse |
128 per pulse |
| Prestack ("stream") data sampling rate |
192 per pulse |
64 per pulse |
| Receiver |
3-component induction coil sensor |
| Measured response |
voltage (dB/dt) and B-field |
| Bandwidth |
base frequency to 10 kHz |
| Stacking rate |
4 stacks per second |
| Digital recording |
all raw data channels |
| |
|
|
Magnetometer: |
Manufacturer
Type
Model
Sampling rate
Sensitivity
Noise envelope |
Scintrex
Cesium vapour optically pumped split beam
CS-2 in towed bird
10 Hz
0.01 nT
<0.25 nT
|
|
Spectrometer: |
Manufacturer
Type
Model
Detector |
Exploranium
256 channel, self-stabilising, downward/upward
GR-820
Nal (TI), 33.6 litres minimum
|
|
Survey Aircraft: |
Manufacturer
Type
Registration
Engines |
de Havilland
DHC-7 (Dash 7)
C-GJPI (Canadian)
Pratt & Whitney PT6A-50 turboprop (4) 1050 HP each |
Applications
Survey
Technology 
