Active guidance control is adopted by the high speed maglev train. The gap between the train and the guide rail is provided by a guidance gap sensor. In order to ensure the reliability of signal

probe with double coil structure is used by sensor and two circuits are the same and completely independent. Due to the small installation space of the sensor

the dual detection coils are needed to be placed in parallel and stacked up. The measurement results is affected by the method due to the mutual inductance between the coils. At the same time

in order to ensure the anti-interference and disturbance ability of the sensor

the guidance gap sensor housing adopts metal shell

which aggravates the problem of the guidance gap sensor. Finite element simulation software is used to simulate the model for the guidance gap sensor probe. In order to solve this problem

the further optimization of the coil structure and the influence of the excitation frequency on the problem are discussed. The simulation results verify the effectiveness of the optimized coil structure and provide a reference for solving the above problems.