Blade bending moment decoupling and calibration method based on optical fiber strain combination bridge circuit

The invention discloses a blade bending moment decoupling and calibration method based on an optical fiber strain combination bridge circuit, and belongs to the technical field of structural health monitoring. The method comprises the following steps: 1, arranging a sensor network; 2, measuring a blade profile pre-torsion angle and realizing waving bending moment decoupling; 3, calculating a flapping bending moment calibration parameter lambda to calibrate the flapping bending moment of the paddle; 4, calculating a coupling coefficient C, and selecting an optimal decoupling combined bridge circuit of the blade structure shimmy bending moment sensor; and 5, calculating a shimmy bending moment calibration parameter lambda to calibrate the shimmy bending moment of the blade. According to the method disclosed by the invention, by acquiring the center wavelength offset characteristic parameter combination lambda waving and lambda swing of the optical fiber Bragg grating sensor, waving and shimmy bending moment dec