What Is The Depths That the Ground Penetrating Radar Can Reach?

GPR or Ground penetrating radar is a device that allows you to “see” underneath the surface using pulses or electromagnetic waves through the antenna. No matter how modern the equipment is, it’s not going to supplant the law of physics. So there will always be constraints depending on the condition on the ground. A monitoring screen is also present so the operator can study the results which are delivered in a matter of nanoseconds.

How deep can it see?

The problem is that the GPR can’t probe far through the rocks, soils or concrete. How does that happen? It’s called signal interference. The efficacy of radio waves will decline when they hit energy absorbing materials until they become undetectable. Try picturing out talking to a cell phone and entering a tunnel and the signal dies out. The concept is similar.

Lowering frequency

If you lower the frequency of the ground penetrating radar, you improve your chance of being able to see deeper. But there’s a drawback to this method. As you dial down the frequency, the resolution suffers. Second, the radio pulses diffuse instead of traveling as waves and you would be better off using the eddy current measurement machine which is another non-invasive way to probe the subsurface.

Another way to improve depth penetration is to increase the power of the transmitter but you will be limited by government regulation, which specifically limits the amount of radio emissions. If the transmitter power is increased past the limit, it will interfere with cell phone or TV signals.