Application: Detection of Unexploded Ordnance (UXO)
WWII Unexploded ordnance (UXO) detection from the surface is often not feasible, since the explosives are buried too deep. When a bomb dropped from an airplane doesn't explode touching the surface, it penetrates the upper soft peat and clay layer and stops at the first stable sand layer. In the Netherlands, this layer can be located at a depth of more than 10 meters below the surface. Due to resolution problems, detection from the surface is not an option in these cases. Measurements from a borehole are needed to solve the problem. Traditionally, these measurements are done using a magnetometer.
Applications TISA 3D in UXO detection
UXO with a large metal content show a strong electrical contrast with the surrounding soil. Therefore, these objects are very good reflectors of radar waves. For TISA 3D Borehole Radar measurements, a borehole is drilled in a safe zone, just outside the investigation area. When it's determined that the area around this borehole is safe, the next measurement is done in an adjacent position closer to the area of investigation. This way the whole area is searched for deep explosives.