Study on the deformation measurement of structure based on fiber Bragg grating sensor

The structure deformation monitoring is a significant basis for judging the operation state of device. In this study, the deformation monitoring system based on fiber Bragg grating sensor has been established. In the deformation monitoring system, the composite plate, support mechanism and loading device have been designed, and the simulation analysis which is utilized to determine the measurement points of fiber Bragg grating sensor has also been carried out. By using BP neural network and numerical analysis, the deflection value of plate can be obtained, and the deformation reconstruction of plate can also be realized. The plate deformation on-line monitoring experiment certifies that the deformation monitoring system based on fiber Bragg grating sensing network owns high sensitivity and good performance, the maximum measurement error is less than 0.32mm.