The new TISA 2D Borehole Radar (2D BHR) has been launched by T&A Survey B.V for subsurface investigations.
The geophysicist’s choice for a simple, safe and clear method to receive enhanced data about the subsurface, TISA 2D borehole radar is different from traditional surface GPR systems as it is deployed inside a borehole directly in the medium of investigation.
TISA 2D’s distinct setup allows for data acquisition from a much greater depth as its measuring depth is essentially limited only by the borehole depth. The second advantage comes from the fact that TISA 2D probes the subsurface in a perpendicular plane to the vertical borehole direction, allowing a horizontal plane of investigation, and enabling the study of the subsurface directly below surface constructions such as buildings. Classical surface GPR systems cannot undertake similar measurements.
Robert van Ingen, Managing Director of T&A Survey explains that the TISA 2D can be used in various shallow and deep underground applications where traditional surface radar cannot penetrate and is beyond their range. Dense urban environments present different challenges than open unobstructed areas where GPR is most often used. TISA 2D BHR has the ability to aid the search and recovery of targets even from under a concrete slab or a building.
The TISA 2D borehole radar has been successfully used in a wide range of projects from sinkhole detection, locating concrete walls and unexploded ordnance (UXO). The TISA technology is often used in Europe to identify and aid in the recovery of WWII aerial bombs. UXO detection is limited to North America but it does demonstrate the tool’s ability to find metal objects such as underground storage tanks (UST) or buried steel drums.
van Ingen adds that radar outperforms EM and magnetics with its high resolution of ±1 foot, which is not possible with EM and magnetics especially when the target is several metres away from the measuring device.