Ground Penetrating Radar
Ground penetrating radar (GPR) is a geophysical method that uses radar pulses to image the subsurface. This non-destructive method uses electromagnetic radiation waves and detects the reflected signals from subsurface structures. The GPR device is an essential tool in The Underground Detective arsenal, requiring years of experience to correctly interpret its results.
How It’s Done
Since the soil does not have to be disturbed, GPR is a safe and cost effective way to identify underground unknowns. GPR units consist of an antenna transmits high frequency radio wave pulses which is dragged or rolled over the soil in a cart and a video screen and/or data logger to record all of the signals received.
Although GPR is very useful for scanning larger area masses and for determining the location and depth of previously unknown objects or soil conditions, it does have limitations that must be taken into consideration.
GPR is used in a number of odd jobs, but the most common calls we receive request help with locating and searching for:
- Metallic and non-metallic pipes
- Underground storage tanks (UST)
- Grave sites
- Concrete scanning
GPR is used on the majority of our jobs to ensure the best utility knowledge along with your safety. We have used it numerous times locating unmarked graves, locating privy pots, and even to discover a time capsule!