Strain and temperature aliasing signal decoupling method for optical fiber grating sensor under dynamic load

The invention discloses a strain and temperature aliasing signal decoupling method for an optical fiber grating sensor under dynamic load, and belongs to the technical field of health monitoring of an intelligent material and a structure. The strain and temperature aliasing signal decoupling method comprises the following steps: step 1, constructing a distribution type train and temperature monitoring system for the optical fiber grating sensor; step 2, monitoring and acquiring a strain and temperature aliasing response signal of the tested structure optical fiber grating sensor in real time; step 3, performing feature extraction and analysis on the strain and temperature aliasing response signal of the optical fiber grating sensor, and decomposing the signal S through an analytic mode decomposing method; adopting a quick changing signal to represent strains caused by dynamic load and adopting a slow changing signal to represent structure temperature change information; step 4, re-constructing the strain and temperature monitoring information of the tested structure. According to the strain and temperature aliasing signal decoupling method, strain and temperature aliasing signal decoupling can be realized by only needing to use the optical fiber grating sensor.