Vehicle vibration monitoring device and method based on two-mode optical fiber

The invention discloses a vehicle vibration monitoring device and method based on a two-mode optical fiber, and the method comprises the steps: dividing continuous laser emitted by a laser into two parts through an optical coupler, modulating one part into a detection pulse through a pulse generator, transmitting the detection pulse to the two-mode sensing optical fiber, and taking the other partas local oscillation light; and after backward Rayleigh scattering light returned by the two-mode sensing optical fiber is combined with local oscillation light, performing data processing by a digital signal processing unit, namely, firstly processing original data of two modes by using a variable coefficient method to obtain a vibration peak with a higher signal-to-noise ratio, then extracting time domain data of the position of the vibration peak, and after EMD feature extraction, inputting the time domain data into a trained neural network to be recognized. Compared with the prior art, theinvention provides the sp