MAPPEM Geophysics System / Package
PASSEM
Towed system with electric dipoles and a 3-axis magnetometer for high-precision mobile measurement of ambient marine electromagnetic fields.
Description
PASSEM is a towed system that measures ambient electromagnetic fields in the water column. Towed by a ship at about 3-4 knots, it combines electric dipoles with a high-precision 3-axis magnetic sensor and sends data on board in real time, covering an area quickly.
Key features
- Four independent electric dipoles (E1 to E4), typically 4 and 20 m
- 3-axis magnetometer
- Bandwidth DC-1 kHz at 24 bit resolution
- Real-time data transmission on board
- Deployable by two people from a small survey boat
Applications
Assessing the environmental impact of marine infrastructure such as power export cables and MRE structures.
Specifications
| Electric dipoles | Four independent (E1 to E4), typically 4 and 20 m |
|---|---|
| Magnetometer | 3-axis |
| Bandwidth | DC– 1 kHz |
| Resolution | 24 bit |
| Tow speed | about 3-4 knots |
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