A Nondestructive Measurement Method of Optical Fiber Young’s Modulus Based on OFDR

Abstract

A nondestructive measurement method based on an Optical frequency domain reflectometry (OFDR) was demonstrated to achieve Young’s modulus of an optical fiber. Such a method can be used to measure, not only the averaged Young’s modulus within the measured fiber length, but also Young’s modulus distribution along the optical fiber axis. Moreover, the standard deviation of the measured Young’s modulus is calculated to analyze the measurement error. Young’s modulus distribution of the coated and uncoated single mode fiber (SMF) samples was successfully measured along the optical fiber axis. The average Young’s modulus of the coated and uncoated SMF samples was 13.75 ± 0.14, and 71.63 ± 0.43 Gpa, respectively, within the measured fiber length of 500 mm. The measured Young’s modulus distribution along the optical fiber axis could be used to analyze the damage degree of the fiber, which is very useful to nondestructively estimate the service life of optical fiber sensors immersed into smart engineer structures.

Moire fringe measurement method for Young modulus

“…Young modulus is the ratio between the normal stress and the corresponding normal strain in the elastic deformation range of solid materials, which is an important physical quantity to describe the deformation resistance ability of solid materials, some literatures introduce the measurement methods and applications of Young modulus [10][11][12][13]. The experiment of measuring Young modulus by traditional stretching method is one of the experimental items widely adopted in physics experiment of science and engineering colleges and comprehensive universities.…”