Slope detection apparatus and method based on distributed optical fiber sensing

A slope detection apparatus based on distributed optical fiber sensing, comprising:

• optical fiber measuring units arranged inside a slope and configured to measure acceleration time sequences of a plurality of state parameters of the slope;
• a demodulator, wherein the demodulator is connected to the optical fiber measuring units and configured to receive the acceleration time sequences of the slope;
• and
• a terminal device, wherein the terminal device is connected to the demodulator and configured to perform multi-domain coupling analysis on the acceleration time sequences so as to generate a feature cloud map of the slope that comprises distribution features of time domain parameters, frequency domain parameters, and time-frequency domain parameters, comparing the distribution features of the time domain parameters, the frequency domain parameters, and the time-frequency domain parameters in the feature cloud map with predetermined multi-domain feature parameter indexes, and determine a stability and health state of the slope based on comparison results;
• wherein the predetermined multi-domain feature parameter indexes comprise predetermined time domain parameter indexes, predetermined frequency domain parameter indexes, and predetermined time-frequency domain parameter indexes;
• wherein performing the multi-domain coupling analysis on the acceleration time sequences so as to generate the feature cloud map comprises:
• performing time domain transform analysis on the acceleration time sequences so as to obtain peak accelerations in different positions of the slope, and generating a first distribution cloud map of peak accelerations of different transverse and longitudinal sections of the slope based on the peak accelerations;
• performing frequency domain transform analysis on the acceleration time sequences, and generating a second distribution cloud map of spectral peaks of the different transverse and longitudinal sections of the slope by analyzing a spectrum and a peak change feature;
• performing time-frequency domain transform analysis on the acceleration time sequences, and generating a third distribution cloud map of energy spectrum peaks of the different transverse and longitudinal sections of the slope by analyzing an energy spectrum feature and a peak change;
• and
• generating the feature cloud map of the slope based on the first distribution cloud map, the second distribution cloud map, and the third distribution cloud map.