Abstract
This paper deals with arail joint gap sensor having two detecting coils across to the exciting coil. The sensor, designed for ordinary railways, is able to detect flux change due to eddy current in the rail. The key points of this paper are as follows: (1) principle of measurement by the rail joint gap sensor with two detecting coils across to the exciting coil, (2) rail joint gap sensor use of resonance, (3) and the possibility of rail joint gap measurements for track inspection car with in high lift-off.
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