An electromagnetic coupling device for high speed running radar for ron-destructive inspection

The paper proposes an electromagnetic coupling device which improves the incidence efficiency of electromagnatic wave into the inspected objects when an electromagnetic wave (radar) is used for non-destructuve inspection. The device enables a fast non-destructive inspection by a radar which is attached to the bottom of an inspection vehicle. That is, it enables the radar to run fast with a lift off the inspected objects. Here, as the inspected objects, we have railways and roads in mind and consider the detection of cavities under ground.