Study on the experiment of cable tension measurement with FBG sensors

Abstract

ABSTRACT Fiber Bragg Grating (FBG) sensors sense the change of temperature or strain by detecting the wavelength shifted reflected by the Bragg grating carved on a fiber. Aiming at measuring tension of cables, we did a lot of experiments with FBGs, testing its loading characteristics, temperature response, repeatability, consistency of different sensors, and long term stabilization. When analyzing data, we find that environment temperature has a serious influence to the result. So we use temperature compensation with a temperature sensor. Then we proceeded same experiments with traditional force sensor under the same condition, compared their result and an alyze the advantages and disadvantages of the two kinds of sensors in the measurement of cable tension. At last, we made some prospect on FBG using on cable tension measurement. Keywords: FBG, Tension measurement, St rain, Temperature compensation 1. INTRODUCTION 1.1 Introduction on FBG sensors Fiber Bragg Grating is a light sensitive sensor that made of Fi ber Bragg Gratings, it can detect the variation of strain or temperature by detecting the shift of wave length of light reflected by the FBGs. When the temperature around the sensor or the strain on the sensor changes, the grating pitch or the reflective index of fiber core will change, causing the change of Bragg condition. The relationship between them is