Abstract
This paper describes an eddy-current-type target-detecting sensor with a short-circuit plate in a railway maintenance car. The output voltage of the detecting coil is disturbed by the vibrating displacement of the measuring frame, which is located near the detecting coil. The disturbed voltage of the detecting coil is decreased 1/10 by the short-circuit plate, which is located between the detecting coil and the measuring frame. The influence of the loop and the separate-type short-circuit plates on the output voltage of the detecting coil was investigated. The results show that the separate-type short-circuit plate has twice the output voltage of a loop-type plate.
