The Ralli is the latest product to be added to the ABEM GroundTEM instrument platform. It represents the ultimate solution for rapid, high-resolution subsurface mapping. Designed for efficiency, this cutting-edge system, based on technology from our expert partners at TEMcompany, delivers precise groundwater and geological data down to 200 m.
Towed by a quad bike, the GroundTEM Ralli efficiently surveys anything from a single profile to an entire landscape, providing detailed subsurface images. The system’s transmitter configuration is adaptable, allowing a choice of compact footprint or deep survey with data provided from just a metre below the surface down to 180 – 200 m. The relatively compact nature of the hardware makes shipping the system and taking it to the field particularly easy, especially for the volume of data it can return in even a short field campaign. This versatility makes the Ralli an invaluable tool for various applications such as mapping recharge pathways, helping to site wells more reliably, or studying the impact of saline intrusion.
| GroundTEM Ralli Software | Navigation, data collection, and visualization (cross-platform format) |
| Power | 14.4 V (Rx) 12 V (Tx) |
| Speed | Up to 20 km/h |
| Environment | IP65, -20 to +50 °C |
| Output current | Dual-moment 3 A / 30 A |
| Tx cable options | 2 × 2 m loop, 1 turn 3 × 3 m loop, 1 turn 3 × 3 m coil, 3 turns |
| Channels | 1 |
| Receiver Coil | Rigid multi-turn 20 m² effective area |
| GNSS | Onboard |
| First Gate | Centred @ 4 µs (low moment) |
The different Tx configurations define the system capabilities: 2 × 2 × 1 is a compact loop providing good depth (maximum ~100 m) but with a reduced footprint for easier deployment; 3 × 3 × 1 is the standard loop for regular sounding depth (maximum ~130 m); 3 × 3 × 3 is a multi-turn coil for deeper surveys (~180 – 200 m).
The TEM method is perfectly suited to locating groundwater and undertaking environmental surveys, but can also be useful for applications such as geological mapping and mineral exploration.
