towed TEM
Towed Transient ElectroMagnetic survey resolves bulk soil and rock electrical resistivity, related to the groundwater within, to tens of metres deep. Towed TEM involves towing electromagnetic antennae back and forth across terrain. Antennae work in pairs and typically are 2 to 6m diameter. Airborne TEM is similar but uses antennae typically from 10m to 50m diameter towed by helicopters or planes.
We make two systems of towed antennae:
- Wallaby - towed by 500kg to 3000kg vehicles, Wallaby is a high productivity, low maintenance system that typically acquires >40km/day. It is bulky to mobilize and quick to setup.
- Wallaroo - towed by <800kg vehicles or walked by people, Wallaroo is a configurable system of antennae and supports that are lightweight and that pack compactly for distant mobilization.
To function, these systems need to be coupled with Transient EM electronics.
The table below puts depth of investigation of Wallaby and Wallaroo into context.
The principle of transient electromagnetics is summarized in the diagram below:
