Double-frequency induced polarization method observation frequency identification and comparison method

The invention provides a double-frequency induced polarization method observation frequency identification and comparison method, which comprises the following steps of: 1, acquiring a tunnel region to be detected, and determining region characteristics of the tunnel region to be detected; 2, setting a monitoring point in the to-be-detected tunnel area according to the area characteristics of the to-be-detected tunnel area, meanwhile, obtaining a dual-frequency excitation signal source, setting the dual-frequency excitation signal source in the monitoring point, and receiving a reflected signal based on the dual-frequency excitation signal source in the monitoring point based on a receiver; 3, performing frequency domain conversion on the reflected signal to obtain a spectrogram, analyzing the spectrogram, and judging whether an abnormal region exists in the tunnel region to be detected or not; and step 4, when the abnormal area exists, carrying out alarm operation, scanning the abnormal area, and carrying ou