Explanation of Mineral Deposits of Budunhua Copper Mine Based on the Transient Electromagnetic Method

The transmitted waveform of the transient electromagnetic method plays an important role in the exploration results. Due to the rectifier inverter circuit using the existing transient electromagnetic transmitter have some shortages, when the transmitter work after a period of time, the internal voltage can along with it drop, the transmitted waveform distortion, resulting in inaccurate measurements. According to these disadvantages, improving the original circuit, three-phase PWM rectifier circuit take the place of the original three-phase controlled rectifying circuit. This can improve the stability of DC current and voltage and power factor of the circuit. And add filter capacitance on the inverter part to filtering harmonics, ensuring the quality of the output current waveform so as to improve the accuracy of the measurement. Simulation experiment in MATLAB/Simulink and draw the waveform of the transient electromagnetic method needed. Budunhua Copper Mine area has good mineral vision. This paper applied transient electromagnetic method to explanation of the Budunhua Copper Mine area. First of all, establish the electromagnetic induction model, analyze frequency and time characteristics of the secondary magnetic field in transient electromagnetic field, program through the MATLAB software and draw the corresponding characteristic curve. Then by comparing calculating results of early and late apparent resistivity and all-time apparent resistivity, get the parameter variation of apparent resistivity of the transient electric magnetic field when mine area change, and draw the corresponding data conclusion. At last, using grid functions of MATLAB, process data and simulate the abnormal changes of transient electromagnetic field of Budunhua copper mine area, completing the explanation of the mine area. From the analysis results, the explanation results of the transient electromagnetic method are more accurate than that of the geophysical data. After the improvement, not only improve the work efficiency, and also improve the accuracy of explanation.