Ground Radar (GPR)
Ground Penetrating Radar (GPR) is real time utility location
REAL 3D GPR SURVEYING – Mala Imaging Radar Arrays (MIRA)
As opposed to normal multi-channel systems, the MIRA system enables efficient 3-D data acquisition, this means that large areas can be mapped without any loss of information, this method is suitable for almost any kind of shallow subsurface investigation, i.e. targets with arbitrary shape, layers and linear objects are mapped equally well.
The MIRA system consists of up to 31 transmitter and receiver antennas combined into one single antenna array unit. In operation the antenna array is tracked and positioned by a robotic (self tracking) total station or an RTK GPS for precise positioning. This provides several parallel profiles exactly positioned at the same time, resulting in a seamless 3D picture of the subsurface, with a high resolution of subsurface features both in vertical and horizontal direction.
Images below are from a large cemetery gravesite investigation in Broome, Western Australia. The Multi Antenna Array was deployed from a John Deere lawnmower, the investigation successfully located hundreds of previously unidentified grave sites, plus some underground services.
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(Click to enlarge the picture)
Non-destructive testing (NDT)
GPR is a wide group of analysis techniques used in science and industry to evaluate the properties of a material, component or system without causing damage. The terms Non-destructive examination (NDE), Non-destructive inspection (NDI), and Non-destructive evaluation (NDE) are also commonly used to describe this technology.
Because NDT does not permanently alter the article being inspected, it is a highly valuable technique that can save both money and time in product evaluation, troubleshooting, and research.