RM
Ground penetrating radar machine
Ground penetrating radar (GPR). The GPR emits a continuous pulse of microwave electromagnetic energy into the ground and detects the backscattered energy, which forms an image on the GPR's screen. A buried object, or disturbance in the soil will cause the radar waves to change velocity and so GPR can be used to search for buried evidence. GPR is effective up to 10 metres below the surface. It can also be used by industry to detect hidden cables and pipes in walls and underground. Photo by LOUISE MURRAY/SCIENCE PHOTO LIBRARY
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