Equivalent Capacitance Model of Segmented Induction Coil in Electromagnetic Exploration System for Deep Resources

The study on fixed-wing electromagnetic induction coil device is conducted according to the characteristics and requirements of deep resources aerial electromagnetic measurement system. In order to detect resources with different structures and forms, the system needs to support the measurement of varying magnetic field signals in a wide frequency range. The induction coil, as the information search probe, its equivalent capacitance parameter plays a key role in the frequency response bandwidth of the detection system. In this article, an analysis model of multi-segment coil is proposed. Through the calculation and analysis of the structural parameters of multi-segment coil, the distributed capacitance parameters of multi-segment coil can be effectively estimated to improve the design efficiency of the electromagnetic induction system. In addition, the key parameters that affect the equivalent capacitance parameters of multi-segment coils are summarized, and the key parameters of coil structure are compared and improved. Finally, the expansion of frequency response bandwidth of induction coils is realized. Through the comparative analysis of actual measurement, the working response bandwidth of the improved two structural coils is 1.29 and 1.19 times that of the original structural coils respectively, and the receiving sensitivity is also improved, which verifies the effectiveness of the proposed analytical model. The analysis shows that the equivalent capacitance parameters of the coil can be controlled more flexibly through the reasonable design of segment spacings and choosing the materials with suitable dielectric constant as the coil framework, so that the designed induction coil can be characterized by good frequency domain response.