Pipeline damage identification based on weak fiber Bragg grating sensor array

With the development of science and technology, the development of optical fiber sensing early warning methods is particularly rapid. At the same time, there are low positioning accuracy and high false alarm rate. Therefore, a more sensitive method based on the combination of weak fiber Bragg grating (wFBG) sensor array and working mode algorithm was proposed. The experimental results show that the strain modal vectors calculated by the improved peak pick-up method (PP) based on the frequency domain decomposition method (FDD) are more sensitive for damage identification than the strain modes. The experimental results show that the strain modal vector calculated by weak fiber Bragg grating sensor array can identify the highly stable modal parameters of pipeline damage degree and location, and has the potential to be applied to long-distance pipeline nondestructive monitoring.