Signal detection mechanism and precision analysis of mine dual-frequency induced polarization instrument receiver

The dual-frequency Induced Polarization method (IP method for short) has been widely used for the detection of ground and tunnel. Affected by strong noise environment in coal roadway, it is very difficult to accurately detect underground weak IP signals. For the promotion in the field of advanced detection in underground coal mine, it is of great significance to research weak excitation signals detection mechanism of the receiver used in the coal mine. On the basis of principle prototype developed, the paper derived theoretically the data processing method of weak IP signals and the detection mechanism of IP parameters and designed a RC (Resistance-Capacitance) network test platform and mathematical calculation model. Through comparing the fitting curve between experiment and theoretical calculation of apparent frequency and apparent relative phase difference about the model, the results show that the measuring precision of phase is higher than that of amplitude about the receiver of principle prototype. The principle prototype of mine dual-frequency IP instrument receiver needs to be further improved and perfected in the aspect of amplitude measurement.