Electromagnetic measurement of the rail displacement by two triangular coils

摘要

This paper describes the structure and output characteristics of a rail displacement sensor using two triangular coils. We demonstrate that the measurement principle of the rail displacement sensor is equivalent to measuring the impedance of the coil. We demonstrate the theoretical calculation under the some assumptions. The maximum error is 0.7 mm between the measured and calculated value. We confirm the validity of the measurement method of the rail displacement because of these results.