Study on Time-Domain Electromagnetic Response of Coal Seams During Spontaneous Combustion

In this paper, the temperature-frequency-electricity parameter relationship is firstly established, and then the reflection coefficient of the three-layer coal medium is calculated based on the generalized propagation matrix method, and then the variation of the reflected waves of the coal seam medium with the coal temperature is obtained by Fourier transform. The results show that the peak value of the reflected wave decreases first with temperature, then flattens out, and finally increases. The characteristic temperatures of different coal types in the process of spontaneous combustion are given in this paper, which provides a basis for the detection and early warning of coal spontaneous combustion.