Strain-Temperature Discrimination Using a Single FBG at Cryogenic Region

Abstract

A simple technique is presented to discriminate the Strain and Temperature with a single Fiber Bragg Grating (FBG) at cryogenic regime. The single FBG is divided into two parts, one half is without coating (FBG1) and other half is coated with Cyno-Acrylic Adhesive (FBG2). The measured temperature and strain sensitivities of the FBGl are 4.05×10^sup -6^ /K and 2.13×10^sup -6^ /µε and FBG2 are 1.39×10^sup -5^ /K and 1.72×10^sup -6^ /µε respectively. FBG2 is more sensitive to low temperature and FBG1 is more sensitive to axial strain