Ground Penetrating Radar

1. The radar unit is pulled over the suspect ground.

2. Antennas are used to transmit and receive the radio waves.

3. An electronic switch turns the antenna on and off at a rate of 50,000 times per second, which created pulsating radio waves.

4. When an object or a potential sinkhole cavity is in the path of the beam, some of the waves are altered. Reflected waves are received by the radar unit, processed electronically and converted into images on a computer screen.

GPR image showing a sinkhole profile.

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