In order to determine the influence of bending moment on the output of EFPI optical fiber sensor, a composite plate specimen with an optical fiber sensor buried in its middle layer was made, and a three-point bending test was performed on the specimen to obtain the relationship between the bending moment and the output strain of the optical fiber sensor. Subsequently, the cross section of the composite plate was observed with a microscope to determine the buried position of the optical fiber sensor. For the specimen whose buried position of the optical fiber sensor deviated from the middle layer of the composite plate, the strain value was calculated using the finite element strain analysis method (FEM). The experimental results show that when the buried position of the optical fiber sensor deviates from the middle layer of the composite plate, the strain of the optical fiber sensor is greater than the calculated value, indicating that the bending moment affects the test performance of the optical fiber sensor. Keywords: bending moment; optical fiber; strain
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