Eliminating the Resonance Interference for an Inductive Speed Sensor Subjected to an Early-Time HEMP Field

In the present study, the mechanism of electromagnetic resonance interference on an inductive speed sensor is investigated. To this end, a second-order equivalent resonance model is established based on the lumped parameter of the speed sensor. Then the effects of different parameters on the interference signal are analyzed. The effect of terminal loads and filter capacitances are simulated in the CST software and the obtained results for the resonance interference signal are analyzed. Moreover, an experiment is carried out and the oscillation of the voltage interference signal is produced by the speed sensor under the testing of early-time high altitude nuclear electromagnetic pulse (HEMP) field. The GTEM cell is used to produce the plane wave for the experiment. Finally, the advantages and disadvantages of different resonance elimination methods are analyzed, and the method is proposed to eliminate the oscillation of the voltage interference signal.