A hybrid design of temperture-strain dual-parameter sensing based on sampled fiber grating

摘要

Cross-sensitivity of temperature and strain in fiber Bragg grating sensor has been a problem in optical fiber sensing. To solve this problem, a fiber optic hybrid design for simultaneous measurement of temperature and strain has been proposed and demonstrated in this paper. It only uses a piece of sampled fiber grating and needs one set of demodulation system for dual-parameter sensing. Its temperature measurement range is -50-200°C with strain test range of 0-2000με. Using OptiGrating software, simulation studies have been carried out. The sensing performances of temperature and strain are also obtained, respectively. Utilizing SPSS software and the method of linear regression analyses, the dual-parameter matrix equations with four sensing coefficients have been provided.