Abstract
Eddy-current rail displacement sensors are used for confirming rail displacement. However the sensor causes trouble and malfunction by a collision with gravel and snow due to the short distance between rail head surface and sensor. Therefore it is necessary to increase the distance between rail head surface and sensor. It is able to detect rail displacement by using coil of high quality factor at twice the distance. Electric field is generated from the coil. The electric field changes by an object that have dielectric constant such as water and reduces precision of the rail displacement detection. Thus, it is necessary to reduce the electric field. In this paper, reducing an electric field by implementing the electric field shield to the sensor and, detecting rail displacement by using coil of high quality factor.
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