Research on Electromagnetic Immunity Design of Coal Mine Instruments Based on Wireless Sensors

For a long time, one of the factors that perplex the safety problem of coal mine is the interference of electromagnetic signals on underground instruments, which affects the normal work of underground instruments. In this paper, we firstly elaborate the causes and hazards of electromagnetic interference on coal mine instruments, and then explore the electromagnetic immunity characteristics of wireless sensors. Finally, we propose to construct an electromagnetic shielding model for coal mine instruments with wireless sensor, and discuss on design of hole and joint structure and slot array spacing of the shielding cavity. We conclude that a shielded body with a symmetrical form of open-cell structure, such as circular and positive, generally has higher shielding effectiveness, and to increase the gap spacing of the shielding cavity can slightly improve the shielding effectiveness. (paper)