Leak Detection Systems (LDS) seek to achieve:
- Detecting leakage in underground pipelines
- Localizing the leakage
Using GPR we are able to detect leaks in underground pipeline systems, as GPR responds to changes in electrical properties, which in turn, are a function of changes in soil and rock material and moisture content.
GPR pulse reflections occur at boundaries in the subsurface; these boundaries themselves are a result of changes in the subsurface material properties. A part of the pulsed signal is reflected while the remaining part of it pulse travels across the interface to again be reflected back to the receiver from another interface boundary. The time it takes the pulse to travel through the layer and back is determined by the thickness and properties of the material. The travel time between upper and lower boundaries of a layer can be used to calculate the layer thickness employing a known velocity.
Field measurements have involved simulated water leaks from a 1m plastic tube, 8cm in radius buried at about 24cm depth in a farm field.
Those scale projects