渦電流形レール遊間センサの速度依存性(計測・高周波デバイス)

概要

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This paper deals with the velocity dependency of an eddy current sensor for measuring the rail joint gap using two air coils for ordinary railways. The sensor is able to detect the flux change due to the eddy current between the sensor and the rail. It is demonstrated that the sensor does not depend on the velocity in conditions where the exciting frequency is more than 50 kHz. The key points of this paper are as follows : (1) the principle of the measurement using a rail joint gap sensor composed of a detecting coil under an exciting coil ; (2) the velocity dependency of the output voltage on a non-joint gap turn disk with an exciting frequency between 500 Hz and 1 MHz, and a velocity between 0.65 and 50 m/s (2.34 and 180 km/h) ; (3) the velocity dependency of the output voltage on a turn disk using two imitated joint gaps.
社団法人日本磁気学会の論文
2005-03-01