Ground Penetrating Radar

We all have heard of Ground-Penetrating Radar (GPR) many times and that is a very useful tool. But do we really know what it is? What does it do for you? How does it work? In this article, we will talk about this gadget to help people understand it better.

GPR is a tool that has been used for a long time as it works simply and allows you to scan below the ground.


The basic principle of work

GPR sends a high-frequency radio signal to the ground, which then reflects the same signals. The signals are collected by the receiver and it stores those signals on the digital medial that can be accessed later from the computer/laptop.

The basic work is a simple measurement of the time that takes from the moment of sending the signal to the moment when it bounces back to the receiver. The time needed for traveling shows the depth and location and the signals are presented on the LCD’s panel. This way, someone can read the signals and see the measurements to understand what is going on below the ground and what they can find.


Data collection

The data collection works a bit simpler when it comes to the mere ground. When you want to find an object (its depth and location) under the ground, the GPR uses other pieces of equipment to get the right data. First of all, the type of equipment you will need is solely dependent on the location of the object. The radar emits the signals and those signals reflect from the objects, which the receiver picks up. Those signals are emitted and picked up a thousand times in a single second. A person who is looking for an object sees the signals and analyzes them, before storing these in the system.

The system allows you to download the collected data to a computer if there is any need for further analysis. 


Use high-frequency Ground Penetrating Radar for concrete

If it happens that we scan concrete, we have to use the high-frequency GPR system that can penetrate concrete. The visualization of the scanned data is usually presented in the form of line scans to have a precise determination of the concrete thickness. However, some GPR systems also use the grid format to present the map of objects that are inside the concrete. This method is much better as it can create the 3D map, which gives a better insight into the whole structure and objects.


How deep do ground penetrating radar work?

This depends on the material that needs to be scanned. The deeper you go, the lower frequency GPR system you will need. A 1000 MHz system will be enough to penetrate the concrete and locate conduits. However, not more than 24 inches deep, you will be able to scan with this system. So if you want to go deeper than 24 inches, you will need a system that works on 500 MHz to penetrate through the material and get the right scans.