When it comes to construction and industrial work, understanding what lies beneath your feet is crucial for safe and efficient operations. While traditional methods have their place, the groundbreaking Ground Penetrating Radar (GPR) technology offers a significant leap forward.
What Is Ground Penetrating Radar (GPR)?
GPR is a non-destructive geophysical method that uses radar pulses to image the subsurface. A GPR system transmits high-frequency radio waves into the ground. When these waves encounter changes in material properties (such as a pipe, a rock, or cables), they reflect back to the receiver. By analysing the time it takes for these reflections to return and their strength, GPR creates a detailed profile of what is hidden underground.
GPR vs. Traditional Cable Locating Technology
Traditional cable locator tools, often referred to as electromagnetic locators, primarily detect metallic cables by sensing electromagnetic fields emitted from them (either passively from live cables or actively by inducing a signal).
Here’s how GPR stands out:
• Detection of Non-Metallic Objects: Traditional underground cable locators in NZ are limited to conductive materials. GPR, however, can detect both metallic and non-metallic utilities, including PVC pipes, concrete ducts, and fibre optic lines, which are increasingly common.
• Depth and Material Information: GPR not only indicates the presence of an object but also provides an approximate depth and often insights into its material type, allowing for more informed decisions.
• Imaging of Subsurface Features: Beyond simple point detection, GPR creates a visual cross-section of the subsurface, revealing complex arrangements of utilities, voids, and even soil stratigraphy.
In an increasingly complex underground environment, Ground Penetrating Radar offers unparalleled insights, making it the preferred choice for comprehensive and safe subsurface investigation. Most industrial companies, such as Safetrak Northland, utilise both GPR technology and EM cable locating technology for their cable locating services.