Tensile stress measurement reasearch of anchor cable by using optical fiber Bragg grating

Abstract

Anchor cable usually works in high tensile stress state,the security and stability of slope are related to the health of anchor cable.In order to reflect the real-time tensile stress state of the anchor cable,the optical fiber Bragg grating is installed on the surface of a single wire of the anchor cable.The anchor cable will deform under the action of forces,which makes the center wavelength of the optical fiber Bragg grating shift.Tensile stress test shows that the tensile stress sensitivity is 19.9pm/kN,the linearity is 1.02%FS.The tensile stress which is applied in the anchor cable can be online monitoring by measuring the center wavelength of the optical fiber Bragg grating.